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Oracle Inter-Session
Communication
Oren Nakdimon
www.db-oriented.com
 oren@db-oriented.com
 +972-54-4393763
@DBoriented
This presentation is available in http://db-oriented.com/presentations
©
Oren
Nakdimon
©
Oren
Nakdimon
http://db-oriented.com
Who Am
I?
INTER-SESSION COMMUNICATION
This presentation is available in http://db-oriented.com/presentations
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Oren
Nakdimon
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Oren
Nakdimon
Session Session
Session
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Oren
Nakdimon
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Oren
Nakdimon
Session Session
Session
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Nakdimon
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Oren
Nakdimon
Session
SGA
Session
Session
This presentation is available in http://db-oriented.com/presentations
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Oren
Nakdimon
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Oren
Nakdimon
Session
SGA
Session
Session
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Nakdimon
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Nakdimon
Session
Outbox
SGA
Inbox
Session
Session
Outbox
Inbox Outbox
Inbox
This presentation is available in http://db-oriented.com/presentations
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Oren
Nakdimon
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Oren
Nakdimon
Session
Outbox
SGA
Inbox
Session
Session
Outbox
Inbox Outbox
Inbox
This presentation is available in http://db-oriented.com/presentations
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Oren
Nakdimon
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Oren
Nakdimon
Session
Outbox
SGA
Inbox
Session
Session
Outbox
Inbox Outbox
Inbox
This presentation is available in http://db-oriented.com/presentations
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Oren
Nakdimon
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Oren
Nakdimon
Session
Outbox
SGA
Session
Outbox
Inbox
Session
Inbox Outbox
Inbox
Outbox
This presentation is available in http://db-oriented.com/presentations
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Oren
Nakdimon
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Oren
Nakdimon
Session
Outbox
SGA
Session
Outbox
Inbox
Session
Inbox Outbox
Inbox
Outbox Inbox
This presentation is available in http://db-oriented.com/presentations
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Oren
Nakdimon
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Oren
Nakdimon
Session
Session
Outbox
SGA
Session
Outbox
Inbox
Inbox Outbox
Outbox
Outbox Inbox
This presentation is available in http://db-oriented.com/presentations
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Oren
Nakdimon
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Nakdimon
Session
Session
Outbox
SGA
Session
Outbox
Inbox
Inbox Outbox
Outbox
Outbox Inbox
This presentation is available in http://db-oriented.com/presentations
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Oren
Nakdimon
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Session
Session
Outbox
SGA
Session
Outbox
Inbox
Inbox Outbox
Outbox
Outbox Inbox
DEMO
Logger
This presentation is available in http://db-oriented.com/presentations
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Oren
Nakdimon
©
Oren
Nakdimon
create or replace package pipe_demo as
procedure log(i_text in varchar2);
procedure get_next
(
o_user out varchar2,
o_sid out number,
o_host out varchar2,
o_time out date,
o_text out varchar2
);
end pipe_demo;
This presentation is available in http://db-oriented.com/presentations
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Oren
Nakdimon
©
Oren
Nakdimon
create or replace package pipe_demo as
procedure log(i_text in varchar2);
procedure get_next
(
o_user out varchar2,
o_sid out number,
o_host out varchar2,
o_time out date,
o_text out varchar2
);
end pipe_demo;
This presentation is available in http://db-oriented.com/presentations
©
Oren
Nakdimon
©
Oren
Nakdimon
create or replace package pipe_demo as
procedure log(i_text in varchar2);
procedure get_next
(
o_user out varchar2,
o_sid out number,
o_host out varchar2,
o_time out date,
o_text out varchar2
);
end pipe_demo;
This presentation is available in http://db-oriented.com/presentations
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Oren
Nakdimon
©
Oren
Nakdimon
create or replace package body pipe_demo as
c_log_pipe constant varchar2(13) := 'DEMO_LOG_PIPE';
procedure log(i_text in varchar2) is
l_status number;
begin
dbms_pipe.pack_message(user);
dbms_pipe.pack_message(to_number(sys_context('userenv', 'sid')));
dbms_pipe.pack_message(sys_context('userenv', 'host'));
dbms_pipe.pack_message(sysdate);
dbms_pipe.pack_message(i_text);
l_status := dbms_pipe.send_message(c_log_pipe);
if l_status != 0 then
raise_application_error(-20000,
'dbms_pipe.send_message failed with status ' || l_status);
end if;
end log;
This presentation is available in http://db-oriented.com/presentations
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Oren
Nakdimon
©
Oren
Nakdimon
create or replace package body pipe_demo as
c_log_pipe constant varchar2(13) := 'DEMO_LOG_PIPE';
procedure log(i_text in varchar2) is
l_status number;
begin
dbms_pipe.pack_message(user);
dbms_pipe.pack_message(to_number(sys_context('userenv', 'sid')));
dbms_pipe.pack_message(sys_context('userenv', 'host'));
dbms_pipe.pack_message(sysdate);
dbms_pipe.pack_message(i_text);
l_status := dbms_pipe.send_message(c_log_pipe);
if l_status != 0 then
raise_application_error(-20000,
'dbms_pipe.send_message failed with status ' || l_status);
end if;
end log;
This presentation is available in http://db-oriented.com/presentations
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Oren
Nakdimon
©
Oren
Nakdimon
create or replace package body pipe_demo as
c_log_pipe constant varchar2(13) := 'DEMO_LOG_PIPE';
procedure log(i_text in varchar2) is
l_status number;
begin
dbms_pipe.pack_message(user);
dbms_pipe.pack_message(to_number(sys_context('userenv', 'sid')));
dbms_pipe.pack_message(sys_context('userenv', 'host'));
dbms_pipe.pack_message(sysdate);
dbms_pipe.pack_message(i_text);
l_status := dbms_pipe.send_message(c_log_pipe);
if l_status != 0 then
raise_application_error(-20000,
'dbms_pipe.send_message failed with status ' || l_status);
end if;
end log;
This presentation is available in http://db-oriented.com/presentations
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Oren
Nakdimon
©
Oren
Nakdimon
create or replace package body pipe_demo as
c_log_pipe constant varchar2(13) := 'DEMO_LOG_PIPE';
procedure log(i_text in varchar2) is
l_status number;
begin
dbms_pipe.pack_message(user);
dbms_pipe.pack_message(to_number(sys_context('userenv', 'sid')));
dbms_pipe.pack_message(sys_context('userenv', 'host'));
dbms_pipe.pack_message(sysdate);
dbms_pipe.pack_message(i_text);
l_status := dbms_pipe.send_message(c_log_pipe);
if l_status != 0 then
raise_application_error(-20000,
'dbms_pipe.send_message failed with status ' || l_status);
end if;
end log;
pack_message (number)
pack_message (varchar2)
pack_message (date)
pack_message_raw
pack_message_rowid
This presentation is available in http://db-oriented.com/presentations
©
Oren
Nakdimon
©
Oren
Nakdimon
create or replace package body pipe_demo as
c_log_pipe constant varchar2(13) := 'DEMO_LOG_PIPE';
procedure log(i_text in varchar2) is
l_status number;
begin
dbms_pipe.pack_message(user);
dbms_pipe.pack_message(to_number(sys_context('userenv', 'sid')));
dbms_pipe.pack_message(sys_context('userenv', 'host'));
dbms_pipe.pack_message(sysdate);
dbms_pipe.pack_message(i_text);
l_status := dbms_pipe.send_message(c_log_pipe);
if l_status != 0 then
raise_application_error(-20000,
'dbms_pipe.send_message failed with status ' || l_status);
end if;
end log;
This presentation is available in http://db-oriented.com/presentations
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Oren
Nakdimon
©
Oren
Nakdimon
procedure get_next
(
o_user out varchar2,
o_sid out number,
o_host out varchar2,
o_time out date,
o_text out varchar2
) is
l_status number;
begin
l_status := dbms_pipe.receive_message(pipename => c_log_pipe);
if l_status != 0 then
raise_application_error(-20000,
'dbms_pipe.receive_message failed with status ' || l_status);
end if;
dbms_pipe.unpack_message(o_user);
dbms_pipe.unpack_message(o_sid);
dbms_pipe.unpack_message(o_host);
dbms_pipe.unpack_message(o_time);
dbms_pipe.unpack_message(o_text);
end get_next;
end pipe_demo;
This presentation is available in http://db-oriented.com/presentations
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Oren
Nakdimon
©
Oren
Nakdimon
procedure get_next
(
o_user out varchar2,
o_sid out number,
o_host out varchar2,
o_time out date,
o_text out varchar2
) is
l_status number;
begin
l_status := dbms_pipe.receive_message(pipename => c_log_pipe);
if l_status != 0 then
raise_application_error(-20000,
'dbms_pipe.receive_message failed with status ' || l_status);
end if;
dbms_pipe.unpack_message(o_user);
dbms_pipe.unpack_message(o_sid);
dbms_pipe.unpack_message(o_host);
dbms_pipe.unpack_message(o_time);
dbms_pipe.unpack_message(o_text);
end get_next;
end pipe_demo;
This presentation is available in http://db-oriented.com/presentations
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Oren
Nakdimon
©
Oren
Nakdimon
procedure get_next
(
o_user out varchar2,
o_sid out number,
o_host out varchar2,
o_time out date,
o_text out varchar2
) is
l_status number;
begin
l_status := dbms_pipe.receive_message(pipename => c_log_pipe);
if l_status != 0 then
raise_application_error(-20000,
'dbms_pipe.receive_message failed with status ' || l_status);
end if;
dbms_pipe.unpack_message(o_user);
dbms_pipe.unpack_message(o_sid);
dbms_pipe.unpack_message(o_host);
dbms_pipe.unpack_message(o_time);
dbms_pipe.unpack_message(o_text);
end get_next;
end pipe_demo;
unpack_message (number)
unpack_message (varchar2)
unpack_message (date)
unpack_message_raw
unpack_message_rowid
This presentation is available in http://db-oriented.com/presentations
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Oren
Nakdimon
©
Oren
Nakdimon
public class Logger {
public static void main(String args[]) throws SQLException {
Properties info = new Properties();
info.put(OracleConnection.CONNECTION_PROPERTY_USER_NAME, DB_USER);
info.put(OracleConnection.CONNECTION_PROPERTY_PASSWORD, DB_PASSWORD);
OracleDataSource ods = new OracleDataSource();
ods.setURL(DB_URL);
ods.setConnectionProperties(info);
try (OracleConnection connection = (OracleConnection) ods.getConnection()) {
DatabaseMetaData dbmd = connection.getMetaData();
System.out.println("Ready...");
System.out.println();
System.out.println("Time Host User SID Message");
System.out.println("--------------- -------------- ----- --- -------");
processRequests(connection);
System.out.println("Bye!");
System.out.println();
}
}
This presentation is available in http://db-oriented.com/presentations
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Oren
Nakdimon
©
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public class Logger {
public static void main(String args[]) throws SQLException {
Properties info = new Properties();
info.put(OracleConnection.CONNECTION_PROPERTY_USER_NAME, DB_USER);
info.put(OracleConnection.CONNECTION_PROPERTY_PASSWORD, DB_PASSWORD);
OracleDataSource ods = new OracleDataSource();
ods.setURL(DB_URL);
ods.setConnectionProperties(info);
try (OracleConnection connection = (OracleConnection) ods.getConnection()) {
DatabaseMetaData dbmd = connection.getMetaData();
System.out.println("Ready...");
System.out.println();
System.out.println("Time Host User SID Message");
System.out.println("--------------- -------------- ----- --- -------");
processRequests(connection);
System.out.println("Bye!");
System.out.println();
}
}
This presentation is available in http://db-oriented.com/presentations
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Oren
Nakdimon
©
Oren
Nakdimon
public class Logger {
public static void main(String args[]) throws SQLException {
Properties info = new Properties();
info.put(OracleConnection.CONNECTION_PROPERTY_USER_NAME, DB_USER);
info.put(OracleConnection.CONNECTION_PROPERTY_PASSWORD, DB_PASSWORD);
OracleDataSource ods = new OracleDataSource();
ods.setURL(DB_URL);
ods.setConnectionProperties(info);
try (OracleConnection connection = (OracleConnection) ods.getConnection()) {
DatabaseMetaData dbmd = connection.getMetaData();
System.out.println("Ready...");
System.out.println();
System.out.println("Time Host User SID Message");
System.out.println("--------------- -------------- ----- --- -------");
processRequests(connection);
System.out.println("Bye!");
System.out.println();
}
}
This presentation is available in http://db-oriented.com/presentations
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Oren
Nakdimon
©
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Nakdimon
public class Logger {
public static void main(String args[]) throws SQLException {
Properties info = new Properties();
info.put(OracleConnection.CONNECTION_PROPERTY_USER_NAME, DB_USER);
info.put(OracleConnection.CONNECTION_PROPERTY_PASSWORD, DB_PASSWORD);
OracleDataSource ods = new OracleDataSource();
ods.setURL(DB_URL);
ods.setConnectionProperties(info);
try (OracleConnection connection = (OracleConnection) ods.getConnection()) {
DatabaseMetaData dbmd = connection.getMetaData();
System.out.println("Ready...");
System.out.println();
System.out.println("Time Host User SID Message");
System.out.println("--------------- -------------- ----- --- -------");
processRequests(connection);
System.out.println("Bye!");
System.out.println();
}
}
This presentation is available in http://db-oriented.com/presentations
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public static void processRequests(Connection connection) throws SQLException {
String user;
int sid;
String host;
Timestamp time;
String text = " ";
CallableStatement callableStatement =
connection.prepareCall("{ call PIPE_DEMO.GET_NEXT(?,?,?,?,?) }");
callableStatement.registerOutParameter(1, java.sql.Types.VARCHAR);
callableStatement.registerOutParameter(2, java.sql.Types.INTEGER);
callableStatement.registerOutParameter(3, java.sql.Types.VARCHAR);
callableStatement.registerOutParameter(4, java.sql.Types.DATE);
callableStatement.registerOutParameter(5, java.sql.Types.VARCHAR);
do {
callableStatement.executeUpdate();
user = callableStatement.getString(1);
sid = callableStatement.getInt(2);
host = callableStatement.getString(3);
time = callableStatement.getTimestamp(4);
text = callableStatement.getString(5);
System.out.println(time + " " + host + " " + user + " " + String.format("%3s",
This presentation is available in http://db-oriented.com/presentations
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Oren
Nakdimon
©
Oren
Nakdimon
public static void processRequests(Connection connection) throws SQLException {
String user;
int sid;
String host;
Timestamp time;
String text = " ";
CallableStatement callableStatement =
connection.prepareCall("{ call PIPE_DEMO.GET_NEXT(?,?,?,?,?) }");
callableStatement.registerOutParameter(1, java.sql.Types.VARCHAR);
callableStatement.registerOutParameter(2, java.sql.Types.INTEGER);
callableStatement.registerOutParameter(3, java.sql.Types.VARCHAR);
callableStatement.registerOutParameter(4, java.sql.Types.DATE);
callableStatement.registerOutParameter(5, java.sql.Types.VARCHAR);
do {
callableStatement.executeUpdate();
user = callableStatement.getString(1);
sid = callableStatement.getInt(2);
host = callableStatement.getString(3);
time = callableStatement.getTimestamp(4);
text = callableStatement.getString(5);
System.out.println(time + " " + host + " " + user + " " + String.format("%3s",
This presentation is available in http://db-oriented.com/presentations
©
Oren
Nakdimon
©
Oren
Nakdimon
public static void processRequests(Connection connection) throws SQLException {
String user;
int sid;
String host;
Timestamp time;
String text = " ";
CallableStatement callableStatement =
connection.prepareCall("{ call PIPE_DEMO.GET_NEXT(?,?,?,?,?) }");
callableStatement.registerOutParameter(1, java.sql.Types.VARCHAR);
callableStatement.registerOutParameter(2, java.sql.Types.INTEGER);
callableStatement.registerOutParameter(3, java.sql.Types.VARCHAR);
callableStatement.registerOutParameter(4, java.sql.Types.DATE);
callableStatement.registerOutParameter(5, java.sql.Types.VARCHAR);
do {
callableStatement.executeUpdate();
user = callableStatement.getString(1);
sid = callableStatement.getInt(2);
host = callableStatement.getString(3);
time = callableStatement.getTimestamp(4);
text = callableStatement.getString(5);
System.out.println(time + " " + host + " " + user + " " + String.format("%3s",
This presentation is available in http://db-oriented.com/presentations
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©
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CallableStatement callableStatement =
connection.prepareCall("{ call PIPE_DEMO.GET_NEXT(?,?,?,?,?) }");
callableStatement.registerOutParameter(1, java.sql.Types.VARCHAR);
callableStatement.registerOutParameter(2, java.sql.Types.INTEGER);
callableStatement.registerOutParameter(3, java.sql.Types.VARCHAR);
callableStatement.registerOutParameter(4, java.sql.Types.DATE);
callableStatement.registerOutParameter(5, java.sql.Types.VARCHAR);
do {
callableStatement.executeUpdate();
user = callableStatement.getString(1);
sid = callableStatement.getInt(2);
host = callableStatement.getString(3);
time = callableStatement.getTimestamp(4);
text = callableStatement.getString(5);
System.out.println(time + " " + host + " " + user + " " + String.format("%3s",
sid) + " " + text);
} while (!text.equals("ABORT"));
callableStatement.close();
}
}
This presentation is available in http://db-oriented.com/presentations
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CallableStatement callableStatement =
connection.prepareCall("{ call PIPE_DEMO.GET_NEXT(?,?,?,?,?) }");
callableStatement.registerOutParameter(1, java.sql.Types.VARCHAR);
callableStatement.registerOutParameter(2, java.sql.Types.INTEGER);
callableStatement.registerOutParameter(3, java.sql.Types.VARCHAR);
callableStatement.registerOutParameter(4, java.sql.Types.DATE);
callableStatement.registerOutParameter(5, java.sql.Types.VARCHAR);
do {
callableStatement.executeUpdate();
user = callableStatement.getString(1);
sid = callableStatement.getInt(2);
host = callableStatement.getString(3);
time = callableStatement.getTimestamp(4);
text = callableStatement.getString(5);
System.out.println(time + " " + host + " " + user + " " + String.format("%3s",
sid) + " " + text);
} while (!text.equals("ABORT"));
callableStatement.close();
}
}
This presentation is available in http://db-oriented.com/presentations
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CallableStatement callableStatement =
connection.prepareCall("{ call PIPE_DEMO.GET_NEXT(?,?,?,?,?) }");
callableStatement.registerOutParameter(1, java.sql.Types.VARCHAR);
callableStatement.registerOutParameter(2, java.sql.Types.INTEGER);
callableStatement.registerOutParameter(3, java.sql.Types.VARCHAR);
callableStatement.registerOutParameter(4, java.sql.Types.DATE);
callableStatement.registerOutParameter(5, java.sql.Types.VARCHAR);
do {
callableStatement.executeUpdate();
user = callableStatement.getString(1);
sid = callableStatement.getInt(2);
host = callableStatement.getString(3);
time = callableStatement.getTimestamp(4);
text = callableStatement.getString(5);
System.out.println(time + " " + host + " " + user + " " + String.format("%3s",
sid) + " " + text);
} while (!text.equals("ABORT"));
callableStatement.close();
}
}
This presentation is available in http://db-oriented.com/presentations
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CallableStatement callableStatement =
connection.prepareCall("{ call PIPE_DEMO.GET_NEXT(?,?,?,?,?) }");
callableStatement.registerOutParameter(1, java.sql.Types.VARCHAR);
callableStatement.registerOutParameter(2, java.sql.Types.INTEGER);
callableStatement.registerOutParameter(3, java.sql.Types.VARCHAR);
callableStatement.registerOutParameter(4, java.sql.Types.DATE);
callableStatement.registerOutParameter(5, java.sql.Types.VARCHAR);
do {
callableStatement.executeUpdate();
user = callableStatement.getString(1);
sid = callableStatement.getInt(2);
host = callableStatement.getString(3);
time = callableStatement.getTimestamp(4);
text = callableStatement.getString(5);
System.out.println(time + " " + host + " " + user + " " + String.format("%3s",
sid) + " " + text);
} while (!text.equals("ABORT"));
callableStatement.close();
}
}
PIPES
A Single Consumer
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SGA
Session
Inbox Outbox
Session
Inbox Outbox
Session
Inbox Outbox
Session
Inbox Outbox
Session
Inbox Outbox
Session
Inbox Outbox
Session
Inbox Outbox
Session
Inbox Outbox
This presentation is available in http://db-oriented.com/presentations
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©
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SGA
Session
Inbox Outbox
Session
Inbox Outbox
Session
Inbox Outbox
Session
Inbox Outbox
Session
Inbox Outbox
Session
Inbox Outbox
Session
Inbox Outbox
Session
Inbox Outbox
This presentation is available in http://db-oriented.com/presentations
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©
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SGA
Session
Inbox Outbox
Session
Inbox Outbox
Session
Inbox Outbox
Session
Inbox Outbox
Session
Inbox Outbox
Session
Inbox Outbox
Session
Inbox Outbox
Session
Inbox Outbox
PIPES
Multiple Consumers
This presentation is available in http://db-oriented.com/presentations
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SGA
Session
Inbox Outbox
Session
Inbox Outbox
Session
Inbox Outbox
Session
Inbox Outbox
Session
Inbox Outbox
Session
Inbox Outbox
DEMO
Multiple Consumers
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This presentation is available in http://db-oriented.com/presentations
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©
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Nakdimon
create or replace package pipe_demo as
procedure log(i_text in varchar2);
procedure get_next
(
o_user out varchar2,
o_sid out number,
o_host out varchar2,
o_time out date,
o_text out varchar2
);
procedure send_many_logs
(
i_text in varchar2,
i_how_many in binary_integer
);
end pipe_demo;
This presentation is available in http://db-oriented.com/presentations
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©
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create or replace package body pipe_demo as
...
procedure send_many_logs
(
i_text in varchar2,
i_how_many in binary_integer
) is
c_alert_name constant varchar2(10) := 'DEMO_ALERT';
l_message varchar2(100);
l_status number;
begin
dbms_alert.register(c_alert_name);
dbms_alert.waitone(c_alert_name, l_message, l_status);
for i in 1 .. i_how_many
loop
pipe_demo.log(i_text || '# ' || to_char(i));
end loop;
dbms_alert.remove(c_alert_name);
end send_many_logs;
end pipe_demo;
This presentation is available in http://db-oriented.com/presentations
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create or replace package body pipe_demo as
...
procedure send_many_logs
(
i_text in varchar2,
i_how_many in binary_integer
) is
c_alert_name constant varchar2(10) := 'DEMO_ALERT';
l_message varchar2(100);
l_status number;
begin
dbms_alert.register(c_alert_name);
dbms_alert.waitone(c_alert_name, l_message, l_status);
for i in 1 .. i_how_many
loop
pipe_demo.log(i_text || '# ' || to_char(i));
end loop;
dbms_alert.remove(c_alert_name);
end send_many_logs;
end pipe_demo;
ALERTS (SIGNALS)
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©
Oren
Nakdimon
Session
Session
Session
Session
Session
Session
This presentation is available in http://db-oriented.com/presentations
©
Oren
Nakdimon
©
Oren
Nakdimon
create or replace package body pipe_demo as
...
procedure send_many_logs
(
i_text in varchar2,
i_how_many in binary_integer
) is
c_alert_name constant varchar2(10) := 'DEMO_ALERT';
l_message varchar2(100);
l_status number;
begin
dbms_alert.register(c_alert_name);
dbms_alert.waitone(c_alert_name, l_message, l_status);
for i in 1 .. i_how_many
loop
pipe_demo.log(i_text || '# ' || to_char(i));
end loop;
dbms_alert.remove(c_alert_name);
end send_many_logs;
end pipe_demo;
This presentation is available in http://db-oriented.com/presentations
©
Oren
Nakdimon
©
Oren
Nakdimon
create or replace package body pipe_demo as
...
procedure send_many_logs
(
i_text in varchar2,
i_how_many in binary_integer
) is
c_alert_name constant varchar2(10) := 'DEMO_ALERT';
l_message varchar2(100);
l_status number;
begin
dbms_alert.register(c_alert_name);
dbms_alert.waitone(c_alert_name, l_message, l_status);
for i in 1 .. i_how_many
loop
pipe_demo.log(i_text || '# ' || to_char(i));
end loop;
dbms_alert.remove(c_alert_name);
end send_many_logs;
end pipe_demo;
This presentation is available in http://db-oriented.com/presentations
©
Oren
Nakdimon
©
Oren
Nakdimon
create or replace package body pipe_demo as
...
procedure send_many_logs
(
i_text in varchar2,
i_how_many in binary_integer
) is
c_alert_name constant varchar2(10) := 'DEMO_ALERT';
l_message varchar2(100);
l_status number;
begin
dbms_alert.register(c_alert_name);
dbms_alert.waitone(c_alert_name, l_message, l_status);
for i in 1 .. i_how_many
loop
pipe_demo.log(i_text || '# ' || to_char(i));
end loop;
dbms_alert.remove(c_alert_name);
end send_many_logs;
end pipe_demo;
There is also dbms_alert.waitany
This presentation is available in http://db-oriented.com/presentations
©
Oren
Nakdimon
©
Oren
Nakdimon
create or replace package body pipe_demo as
...
procedure send_many_logs
(
i_text in varchar2,
i_how_many in binary_integer
) is
c_alert_name constant varchar2(10) := 'DEMO_ALERT';
l_message varchar2(100);
l_status number;
begin
dbms_alert.register(c_alert_name);
dbms_alert.waitone(c_alert_name, l_message, l_status);
for i in 1 .. i_how_many
loop
pipe_demo.log(i_text || '# ' || to_char(i));
end loop;
dbms_alert.remove(c_alert_name);
end send_many_logs;
end pipe_demo; There is also dbms_alert.removeall
PIPES
Request and Response
This presentation is available in http://db-oriented.com/presentations
©
Oren
Nakdimon
©
Oren
Nakdimon
SGA
Session
Inbox Outbox
Session
Inbox Outbox
Session
Inbox Outbox
This presentation is available in http://db-oriented.com/presentations
©
Oren
Nakdimon
©
Oren
Nakdimon
SGA
Session
Inbox Outbox
Session
Inbox Outbox
Session
Inbox Outbox
dbms_pipe.unique_session_name
This presentation is available in http://db-oriented.com/presentations
©
Oren
Nakdimon
©
Oren
Nakdimon
DBMS_PIPE DBMS_ALERT
Type Named Pipes / Queue Signals / Broadcast
Implementation SGA structure Table
Transactional? Non-Transactional Transactional
Consumers of a specific
message
Single Consumer Zero-to-Multiple Consumers
Blocked Publisher? When pipe is full (“pipe put”
wait event)
When other session signaled
to the same alert and hasn’t
committed yet (TX lock), but
only if there are registered
consumers
Possible Loss of Messages? Instance crash/shutdown Multiple signals to the same
alert before read by the
consumer
THANK YOU
Oren Nakdimon
www.db-oriented.com
 oren@db-oriented.com
 +972-54-4393763
@DBoriented

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Oracle Inter-Session Communication

  • 1. Oracle Inter-Session Communication Oren Nakdimon www.db-oriented.com  oren@db-oriented.com  +972-54-4393763 @DBoriented
  • 2. This presentation is available in http://db-oriented.com/presentations © Oren Nakdimon © Oren Nakdimon http://db-oriented.com Who Am I?
  • 4. This presentation is available in http://db-oriented.com/presentations © Oren Nakdimon © Oren Nakdimon Session Session Session
  • 5. This presentation is available in http://db-oriented.com/presentations © Oren Nakdimon © Oren Nakdimon Session Session Session
  • 6. This presentation is available in http://db-oriented.com/presentations © Oren Nakdimon © Oren Nakdimon Session SGA Session Session
  • 7. This presentation is available in http://db-oriented.com/presentations © Oren Nakdimon © Oren Nakdimon Session SGA Session Session
  • 8. This presentation is available in http://db-oriented.com/presentations © Oren Nakdimon © Oren Nakdimon Session Outbox SGA Inbox Session Session Outbox Inbox Outbox Inbox
  • 9. This presentation is available in http://db-oriented.com/presentations © Oren Nakdimon © Oren Nakdimon Session Outbox SGA Inbox Session Session Outbox Inbox Outbox Inbox
  • 10. This presentation is available in http://db-oriented.com/presentations © Oren Nakdimon © Oren Nakdimon Session Outbox SGA Inbox Session Session Outbox Inbox Outbox Inbox
  • 11. This presentation is available in http://db-oriented.com/presentations © Oren Nakdimon © Oren Nakdimon Session Outbox SGA Session Outbox Inbox Session Inbox Outbox Inbox Outbox
  • 12. This presentation is available in http://db-oriented.com/presentations © Oren Nakdimon © Oren Nakdimon Session Outbox SGA Session Outbox Inbox Session Inbox Outbox Inbox Outbox Inbox
  • 13. This presentation is available in http://db-oriented.com/presentations © Oren Nakdimon © Oren Nakdimon Session Session Outbox SGA Session Outbox Inbox Inbox Outbox Outbox Outbox Inbox
  • 14. This presentation is available in http://db-oriented.com/presentations © Oren Nakdimon © Oren Nakdimon Session Session Outbox SGA Session Outbox Inbox Inbox Outbox Outbox Outbox Inbox
  • 15. This presentation is available in http://db-oriented.com/presentations © Oren Nakdimon © Oren Nakdimon Session Session Outbox SGA Session Outbox Inbox Inbox Outbox Outbox Outbox Inbox
  • 17. This presentation is available in http://db-oriented.com/presentations © Oren Nakdimon © Oren Nakdimon create or replace package pipe_demo as procedure log(i_text in varchar2); procedure get_next ( o_user out varchar2, o_sid out number, o_host out varchar2, o_time out date, o_text out varchar2 ); end pipe_demo;
  • 18. This presentation is available in http://db-oriented.com/presentations © Oren Nakdimon © Oren Nakdimon create or replace package pipe_demo as procedure log(i_text in varchar2); procedure get_next ( o_user out varchar2, o_sid out number, o_host out varchar2, o_time out date, o_text out varchar2 ); end pipe_demo;
  • 19. This presentation is available in http://db-oriented.com/presentations © Oren Nakdimon © Oren Nakdimon create or replace package pipe_demo as procedure log(i_text in varchar2); procedure get_next ( o_user out varchar2, o_sid out number, o_host out varchar2, o_time out date, o_text out varchar2 ); end pipe_demo;
  • 20. This presentation is available in http://db-oriented.com/presentations © Oren Nakdimon © Oren Nakdimon create or replace package body pipe_demo as c_log_pipe constant varchar2(13) := 'DEMO_LOG_PIPE'; procedure log(i_text in varchar2) is l_status number; begin dbms_pipe.pack_message(user); dbms_pipe.pack_message(to_number(sys_context('userenv', 'sid'))); dbms_pipe.pack_message(sys_context('userenv', 'host')); dbms_pipe.pack_message(sysdate); dbms_pipe.pack_message(i_text); l_status := dbms_pipe.send_message(c_log_pipe); if l_status != 0 then raise_application_error(-20000, 'dbms_pipe.send_message failed with status ' || l_status); end if; end log;
  • 21. This presentation is available in http://db-oriented.com/presentations © Oren Nakdimon © Oren Nakdimon create or replace package body pipe_demo as c_log_pipe constant varchar2(13) := 'DEMO_LOG_PIPE'; procedure log(i_text in varchar2) is l_status number; begin dbms_pipe.pack_message(user); dbms_pipe.pack_message(to_number(sys_context('userenv', 'sid'))); dbms_pipe.pack_message(sys_context('userenv', 'host')); dbms_pipe.pack_message(sysdate); dbms_pipe.pack_message(i_text); l_status := dbms_pipe.send_message(c_log_pipe); if l_status != 0 then raise_application_error(-20000, 'dbms_pipe.send_message failed with status ' || l_status); end if; end log;
  • 22. This presentation is available in http://db-oriented.com/presentations © Oren Nakdimon © Oren Nakdimon create or replace package body pipe_demo as c_log_pipe constant varchar2(13) := 'DEMO_LOG_PIPE'; procedure log(i_text in varchar2) is l_status number; begin dbms_pipe.pack_message(user); dbms_pipe.pack_message(to_number(sys_context('userenv', 'sid'))); dbms_pipe.pack_message(sys_context('userenv', 'host')); dbms_pipe.pack_message(sysdate); dbms_pipe.pack_message(i_text); l_status := dbms_pipe.send_message(c_log_pipe); if l_status != 0 then raise_application_error(-20000, 'dbms_pipe.send_message failed with status ' || l_status); end if; end log;
  • 23. This presentation is available in http://db-oriented.com/presentations © Oren Nakdimon © Oren Nakdimon create or replace package body pipe_demo as c_log_pipe constant varchar2(13) := 'DEMO_LOG_PIPE'; procedure log(i_text in varchar2) is l_status number; begin dbms_pipe.pack_message(user); dbms_pipe.pack_message(to_number(sys_context('userenv', 'sid'))); dbms_pipe.pack_message(sys_context('userenv', 'host')); dbms_pipe.pack_message(sysdate); dbms_pipe.pack_message(i_text); l_status := dbms_pipe.send_message(c_log_pipe); if l_status != 0 then raise_application_error(-20000, 'dbms_pipe.send_message failed with status ' || l_status); end if; end log; pack_message (number) pack_message (varchar2) pack_message (date) pack_message_raw pack_message_rowid
  • 24. This presentation is available in http://db-oriented.com/presentations © Oren Nakdimon © Oren Nakdimon create or replace package body pipe_demo as c_log_pipe constant varchar2(13) := 'DEMO_LOG_PIPE'; procedure log(i_text in varchar2) is l_status number; begin dbms_pipe.pack_message(user); dbms_pipe.pack_message(to_number(sys_context('userenv', 'sid'))); dbms_pipe.pack_message(sys_context('userenv', 'host')); dbms_pipe.pack_message(sysdate); dbms_pipe.pack_message(i_text); l_status := dbms_pipe.send_message(c_log_pipe); if l_status != 0 then raise_application_error(-20000, 'dbms_pipe.send_message failed with status ' || l_status); end if; end log;
  • 25. This presentation is available in http://db-oriented.com/presentations © Oren Nakdimon © Oren Nakdimon procedure get_next ( o_user out varchar2, o_sid out number, o_host out varchar2, o_time out date, o_text out varchar2 ) is l_status number; begin l_status := dbms_pipe.receive_message(pipename => c_log_pipe); if l_status != 0 then raise_application_error(-20000, 'dbms_pipe.receive_message failed with status ' || l_status); end if; dbms_pipe.unpack_message(o_user); dbms_pipe.unpack_message(o_sid); dbms_pipe.unpack_message(o_host); dbms_pipe.unpack_message(o_time); dbms_pipe.unpack_message(o_text); end get_next; end pipe_demo;
  • 26. This presentation is available in http://db-oriented.com/presentations © Oren Nakdimon © Oren Nakdimon procedure get_next ( o_user out varchar2, o_sid out number, o_host out varchar2, o_time out date, o_text out varchar2 ) is l_status number; begin l_status := dbms_pipe.receive_message(pipename => c_log_pipe); if l_status != 0 then raise_application_error(-20000, 'dbms_pipe.receive_message failed with status ' || l_status); end if; dbms_pipe.unpack_message(o_user); dbms_pipe.unpack_message(o_sid); dbms_pipe.unpack_message(o_host); dbms_pipe.unpack_message(o_time); dbms_pipe.unpack_message(o_text); end get_next; end pipe_demo;
  • 27. This presentation is available in http://db-oriented.com/presentations © Oren Nakdimon © Oren Nakdimon procedure get_next ( o_user out varchar2, o_sid out number, o_host out varchar2, o_time out date, o_text out varchar2 ) is l_status number; begin l_status := dbms_pipe.receive_message(pipename => c_log_pipe); if l_status != 0 then raise_application_error(-20000, 'dbms_pipe.receive_message failed with status ' || l_status); end if; dbms_pipe.unpack_message(o_user); dbms_pipe.unpack_message(o_sid); dbms_pipe.unpack_message(o_host); dbms_pipe.unpack_message(o_time); dbms_pipe.unpack_message(o_text); end get_next; end pipe_demo; unpack_message (number) unpack_message (varchar2) unpack_message (date) unpack_message_raw unpack_message_rowid
  • 28. This presentation is available in http://db-oriented.com/presentations © Oren Nakdimon © Oren Nakdimon public class Logger { public static void main(String args[]) throws SQLException { Properties info = new Properties(); info.put(OracleConnection.CONNECTION_PROPERTY_USER_NAME, DB_USER); info.put(OracleConnection.CONNECTION_PROPERTY_PASSWORD, DB_PASSWORD); OracleDataSource ods = new OracleDataSource(); ods.setURL(DB_URL); ods.setConnectionProperties(info); try (OracleConnection connection = (OracleConnection) ods.getConnection()) { DatabaseMetaData dbmd = connection.getMetaData(); System.out.println("Ready..."); System.out.println(); System.out.println("Time Host User SID Message"); System.out.println("--------------- -------------- ----- --- -------"); processRequests(connection); System.out.println("Bye!"); System.out.println(); } }
  • 29. This presentation is available in http://db-oriented.com/presentations © Oren Nakdimon © Oren Nakdimon public class Logger { public static void main(String args[]) throws SQLException { Properties info = new Properties(); info.put(OracleConnection.CONNECTION_PROPERTY_USER_NAME, DB_USER); info.put(OracleConnection.CONNECTION_PROPERTY_PASSWORD, DB_PASSWORD); OracleDataSource ods = new OracleDataSource(); ods.setURL(DB_URL); ods.setConnectionProperties(info); try (OracleConnection connection = (OracleConnection) ods.getConnection()) { DatabaseMetaData dbmd = connection.getMetaData(); System.out.println("Ready..."); System.out.println(); System.out.println("Time Host User SID Message"); System.out.println("--------------- -------------- ----- --- -------"); processRequests(connection); System.out.println("Bye!"); System.out.println(); } }
  • 30. This presentation is available in http://db-oriented.com/presentations © Oren Nakdimon © Oren Nakdimon public class Logger { public static void main(String args[]) throws SQLException { Properties info = new Properties(); info.put(OracleConnection.CONNECTION_PROPERTY_USER_NAME, DB_USER); info.put(OracleConnection.CONNECTION_PROPERTY_PASSWORD, DB_PASSWORD); OracleDataSource ods = new OracleDataSource(); ods.setURL(DB_URL); ods.setConnectionProperties(info); try (OracleConnection connection = (OracleConnection) ods.getConnection()) { DatabaseMetaData dbmd = connection.getMetaData(); System.out.println("Ready..."); System.out.println(); System.out.println("Time Host User SID Message"); System.out.println("--------------- -------------- ----- --- -------"); processRequests(connection); System.out.println("Bye!"); System.out.println(); } }
  • 31. This presentation is available in http://db-oriented.com/presentations © Oren Nakdimon © Oren Nakdimon public class Logger { public static void main(String args[]) throws SQLException { Properties info = new Properties(); info.put(OracleConnection.CONNECTION_PROPERTY_USER_NAME, DB_USER); info.put(OracleConnection.CONNECTION_PROPERTY_PASSWORD, DB_PASSWORD); OracleDataSource ods = new OracleDataSource(); ods.setURL(DB_URL); ods.setConnectionProperties(info); try (OracleConnection connection = (OracleConnection) ods.getConnection()) { DatabaseMetaData dbmd = connection.getMetaData(); System.out.println("Ready..."); System.out.println(); System.out.println("Time Host User SID Message"); System.out.println("--------------- -------------- ----- --- -------"); processRequests(connection); System.out.println("Bye!"); System.out.println(); } }
  • 32. This presentation is available in http://db-oriented.com/presentations © Oren Nakdimon © Oren Nakdimon public static void processRequests(Connection connection) throws SQLException { String user; int sid; String host; Timestamp time; String text = " "; CallableStatement callableStatement = connection.prepareCall("{ call PIPE_DEMO.GET_NEXT(?,?,?,?,?) }"); callableStatement.registerOutParameter(1, java.sql.Types.VARCHAR); callableStatement.registerOutParameter(2, java.sql.Types.INTEGER); callableStatement.registerOutParameter(3, java.sql.Types.VARCHAR); callableStatement.registerOutParameter(4, java.sql.Types.DATE); callableStatement.registerOutParameter(5, java.sql.Types.VARCHAR); do { callableStatement.executeUpdate(); user = callableStatement.getString(1); sid = callableStatement.getInt(2); host = callableStatement.getString(3); time = callableStatement.getTimestamp(4); text = callableStatement.getString(5); System.out.println(time + " " + host + " " + user + " " + String.format("%3s",
  • 33. This presentation is available in http://db-oriented.com/presentations © Oren Nakdimon © Oren Nakdimon public static void processRequests(Connection connection) throws SQLException { String user; int sid; String host; Timestamp time; String text = " "; CallableStatement callableStatement = connection.prepareCall("{ call PIPE_DEMO.GET_NEXT(?,?,?,?,?) }"); callableStatement.registerOutParameter(1, java.sql.Types.VARCHAR); callableStatement.registerOutParameter(2, java.sql.Types.INTEGER); callableStatement.registerOutParameter(3, java.sql.Types.VARCHAR); callableStatement.registerOutParameter(4, java.sql.Types.DATE); callableStatement.registerOutParameter(5, java.sql.Types.VARCHAR); do { callableStatement.executeUpdate(); user = callableStatement.getString(1); sid = callableStatement.getInt(2); host = callableStatement.getString(3); time = callableStatement.getTimestamp(4); text = callableStatement.getString(5); System.out.println(time + " " + host + " " + user + " " + String.format("%3s",
  • 34. This presentation is available in http://db-oriented.com/presentations © Oren Nakdimon © Oren Nakdimon public static void processRequests(Connection connection) throws SQLException { String user; int sid; String host; Timestamp time; String text = " "; CallableStatement callableStatement = connection.prepareCall("{ call PIPE_DEMO.GET_NEXT(?,?,?,?,?) }"); callableStatement.registerOutParameter(1, java.sql.Types.VARCHAR); callableStatement.registerOutParameter(2, java.sql.Types.INTEGER); callableStatement.registerOutParameter(3, java.sql.Types.VARCHAR); callableStatement.registerOutParameter(4, java.sql.Types.DATE); callableStatement.registerOutParameter(5, java.sql.Types.VARCHAR); do { callableStatement.executeUpdate(); user = callableStatement.getString(1); sid = callableStatement.getInt(2); host = callableStatement.getString(3); time = callableStatement.getTimestamp(4); text = callableStatement.getString(5); System.out.println(time + " " + host + " " + user + " " + String.format("%3s",
  • 35. This presentation is available in http://db-oriented.com/presentations © Oren Nakdimon © Oren Nakdimon CallableStatement callableStatement = connection.prepareCall("{ call PIPE_DEMO.GET_NEXT(?,?,?,?,?) }"); callableStatement.registerOutParameter(1, java.sql.Types.VARCHAR); callableStatement.registerOutParameter(2, java.sql.Types.INTEGER); callableStatement.registerOutParameter(3, java.sql.Types.VARCHAR); callableStatement.registerOutParameter(4, java.sql.Types.DATE); callableStatement.registerOutParameter(5, java.sql.Types.VARCHAR); do { callableStatement.executeUpdate(); user = callableStatement.getString(1); sid = callableStatement.getInt(2); host = callableStatement.getString(3); time = callableStatement.getTimestamp(4); text = callableStatement.getString(5); System.out.println(time + " " + host + " " + user + " " + String.format("%3s", sid) + " " + text); } while (!text.equals("ABORT")); callableStatement.close(); } }
  • 36. This presentation is available in http://db-oriented.com/presentations © Oren Nakdimon © Oren Nakdimon CallableStatement callableStatement = connection.prepareCall("{ call PIPE_DEMO.GET_NEXT(?,?,?,?,?) }"); callableStatement.registerOutParameter(1, java.sql.Types.VARCHAR); callableStatement.registerOutParameter(2, java.sql.Types.INTEGER); callableStatement.registerOutParameter(3, java.sql.Types.VARCHAR); callableStatement.registerOutParameter(4, java.sql.Types.DATE); callableStatement.registerOutParameter(5, java.sql.Types.VARCHAR); do { callableStatement.executeUpdate(); user = callableStatement.getString(1); sid = callableStatement.getInt(2); host = callableStatement.getString(3); time = callableStatement.getTimestamp(4); text = callableStatement.getString(5); System.out.println(time + " " + host + " " + user + " " + String.format("%3s", sid) + " " + text); } while (!text.equals("ABORT")); callableStatement.close(); } }
  • 37. This presentation is available in http://db-oriented.com/presentations © Oren Nakdimon © Oren Nakdimon CallableStatement callableStatement = connection.prepareCall("{ call PIPE_DEMO.GET_NEXT(?,?,?,?,?) }"); callableStatement.registerOutParameter(1, java.sql.Types.VARCHAR); callableStatement.registerOutParameter(2, java.sql.Types.INTEGER); callableStatement.registerOutParameter(3, java.sql.Types.VARCHAR); callableStatement.registerOutParameter(4, java.sql.Types.DATE); callableStatement.registerOutParameter(5, java.sql.Types.VARCHAR); do { callableStatement.executeUpdate(); user = callableStatement.getString(1); sid = callableStatement.getInt(2); host = callableStatement.getString(3); time = callableStatement.getTimestamp(4); text = callableStatement.getString(5); System.out.println(time + " " + host + " " + user + " " + String.format("%3s", sid) + " " + text); } while (!text.equals("ABORT")); callableStatement.close(); } }
  • 38. This presentation is available in http://db-oriented.com/presentations © Oren Nakdimon © Oren Nakdimon CallableStatement callableStatement = connection.prepareCall("{ call PIPE_DEMO.GET_NEXT(?,?,?,?,?) }"); callableStatement.registerOutParameter(1, java.sql.Types.VARCHAR); callableStatement.registerOutParameter(2, java.sql.Types.INTEGER); callableStatement.registerOutParameter(3, java.sql.Types.VARCHAR); callableStatement.registerOutParameter(4, java.sql.Types.DATE); callableStatement.registerOutParameter(5, java.sql.Types.VARCHAR); do { callableStatement.executeUpdate(); user = callableStatement.getString(1); sid = callableStatement.getInt(2); host = callableStatement.getString(3); time = callableStatement.getTimestamp(4); text = callableStatement.getString(5); System.out.println(time + " " + host + " " + user + " " + String.format("%3s", sid) + " " + text); } while (!text.equals("ABORT")); callableStatement.close(); } }
  • 40. This presentation is available in http://db-oriented.com/presentations © Oren Nakdimon © Oren Nakdimon SGA Session Inbox Outbox Session Inbox Outbox Session Inbox Outbox Session Inbox Outbox Session Inbox Outbox Session Inbox Outbox Session Inbox Outbox Session Inbox Outbox
  • 41. This presentation is available in http://db-oriented.com/presentations © Oren Nakdimon © Oren Nakdimon SGA Session Inbox Outbox Session Inbox Outbox Session Inbox Outbox Session Inbox Outbox Session Inbox Outbox Session Inbox Outbox Session Inbox Outbox Session Inbox Outbox
  • 42. This presentation is available in http://db-oriented.com/presentations © Oren Nakdimon © Oren Nakdimon SGA Session Inbox Outbox Session Inbox Outbox Session Inbox Outbox Session Inbox Outbox Session Inbox Outbox Session Inbox Outbox Session Inbox Outbox Session Inbox Outbox
  • 44. This presentation is available in http://db-oriented.com/presentations © Oren Nakdimon © Oren Nakdimon SGA Session Inbox Outbox Session Inbox Outbox Session Inbox Outbox Session Inbox Outbox Session Inbox Outbox Session Inbox Outbox
  • 46. This presentation is available in http://db-oriented.com/presentations © Oren Nakdimon © Oren Nakdimon
  • 47. This presentation is available in http://db-oriented.com/presentations © Oren Nakdimon © Oren Nakdimon create or replace package pipe_demo as procedure log(i_text in varchar2); procedure get_next ( o_user out varchar2, o_sid out number, o_host out varchar2, o_time out date, o_text out varchar2 ); procedure send_many_logs ( i_text in varchar2, i_how_many in binary_integer ); end pipe_demo;
  • 48. This presentation is available in http://db-oriented.com/presentations © Oren Nakdimon © Oren Nakdimon create or replace package body pipe_demo as ... procedure send_many_logs ( i_text in varchar2, i_how_many in binary_integer ) is c_alert_name constant varchar2(10) := 'DEMO_ALERT'; l_message varchar2(100); l_status number; begin dbms_alert.register(c_alert_name); dbms_alert.waitone(c_alert_name, l_message, l_status); for i in 1 .. i_how_many loop pipe_demo.log(i_text || '# ' || to_char(i)); end loop; dbms_alert.remove(c_alert_name); end send_many_logs; end pipe_demo;
  • 49. This presentation is available in http://db-oriented.com/presentations © Oren Nakdimon © Oren Nakdimon create or replace package body pipe_demo as ... procedure send_many_logs ( i_text in varchar2, i_how_many in binary_integer ) is c_alert_name constant varchar2(10) := 'DEMO_ALERT'; l_message varchar2(100); l_status number; begin dbms_alert.register(c_alert_name); dbms_alert.waitone(c_alert_name, l_message, l_status); for i in 1 .. i_how_many loop pipe_demo.log(i_text || '# ' || to_char(i)); end loop; dbms_alert.remove(c_alert_name); end send_many_logs; end pipe_demo;
  • 51. This presentation is available in http://db-oriented.com/presentations © Oren Nakdimon © Oren Nakdimon Session Session Session Session Session Session
  • 52. This presentation is available in http://db-oriented.com/presentations © Oren Nakdimon © Oren Nakdimon create or replace package body pipe_demo as ... procedure send_many_logs ( i_text in varchar2, i_how_many in binary_integer ) is c_alert_name constant varchar2(10) := 'DEMO_ALERT'; l_message varchar2(100); l_status number; begin dbms_alert.register(c_alert_name); dbms_alert.waitone(c_alert_name, l_message, l_status); for i in 1 .. i_how_many loop pipe_demo.log(i_text || '# ' || to_char(i)); end loop; dbms_alert.remove(c_alert_name); end send_many_logs; end pipe_demo;
  • 53. This presentation is available in http://db-oriented.com/presentations © Oren Nakdimon © Oren Nakdimon create or replace package body pipe_demo as ... procedure send_many_logs ( i_text in varchar2, i_how_many in binary_integer ) is c_alert_name constant varchar2(10) := 'DEMO_ALERT'; l_message varchar2(100); l_status number; begin dbms_alert.register(c_alert_name); dbms_alert.waitone(c_alert_name, l_message, l_status); for i in 1 .. i_how_many loop pipe_demo.log(i_text || '# ' || to_char(i)); end loop; dbms_alert.remove(c_alert_name); end send_many_logs; end pipe_demo;
  • 54. This presentation is available in http://db-oriented.com/presentations © Oren Nakdimon © Oren Nakdimon create or replace package body pipe_demo as ... procedure send_many_logs ( i_text in varchar2, i_how_many in binary_integer ) is c_alert_name constant varchar2(10) := 'DEMO_ALERT'; l_message varchar2(100); l_status number; begin dbms_alert.register(c_alert_name); dbms_alert.waitone(c_alert_name, l_message, l_status); for i in 1 .. i_how_many loop pipe_demo.log(i_text || '# ' || to_char(i)); end loop; dbms_alert.remove(c_alert_name); end send_many_logs; end pipe_demo; There is also dbms_alert.waitany
  • 55. This presentation is available in http://db-oriented.com/presentations © Oren Nakdimon © Oren Nakdimon create or replace package body pipe_demo as ... procedure send_many_logs ( i_text in varchar2, i_how_many in binary_integer ) is c_alert_name constant varchar2(10) := 'DEMO_ALERT'; l_message varchar2(100); l_status number; begin dbms_alert.register(c_alert_name); dbms_alert.waitone(c_alert_name, l_message, l_status); for i in 1 .. i_how_many loop pipe_demo.log(i_text || '# ' || to_char(i)); end loop; dbms_alert.remove(c_alert_name); end send_many_logs; end pipe_demo; There is also dbms_alert.removeall
  • 57. This presentation is available in http://db-oriented.com/presentations © Oren Nakdimon © Oren Nakdimon SGA Session Inbox Outbox Session Inbox Outbox Session Inbox Outbox
  • 58. This presentation is available in http://db-oriented.com/presentations © Oren Nakdimon © Oren Nakdimon SGA Session Inbox Outbox Session Inbox Outbox Session Inbox Outbox dbms_pipe.unique_session_name
  • 59. This presentation is available in http://db-oriented.com/presentations © Oren Nakdimon © Oren Nakdimon DBMS_PIPE DBMS_ALERT Type Named Pipes / Queue Signals / Broadcast Implementation SGA structure Table Transactional? Non-Transactional Transactional Consumers of a specific message Single Consumer Zero-to-Multiple Consumers Blocked Publisher? When pipe is full (“pipe put” wait event) When other session signaled to the same alert and hasn’t committed yet (TX lock), but only if there are registered consumers Possible Loss of Messages? Instance crash/shutdown Multiple signals to the same alert before read by the consumer
  • 60. THANK YOU Oren Nakdimon www.db-oriented.com  oren@db-oriented.com  +972-54-4393763 @DBoriented