Slides used for my Oracle Open World 2014 #OOW14 session. The new release of Oracle Database has come with many new exciting enhancements for high availability. The aim of this presentation is to introduce some new Oracle Active Data Guard features through practical examples and live demos. Among the various enhancements, the new Far Sync Instance and Real-Time Cascade Standby features receive special attention in the session.

1. 2014 © Trivadis
BASEL BERN BRUGG LAUSANNE ZUERICH DUESSELDORF FRANKFURT A.M. FREIBURG I.BR. HAMBURG MUNICH STUTTGART VIENNA
Data Guard 12c: Far Sync Instance, Real-Time Cascade Standby and other goodies
Ludovico Caldara
Oracle ACE, Senior Consultant
Trivadis SA
02.10.2014
Oracle Active Data Guard 12c
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2. 2014 © Trivadis
About Ludovico Caldara
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■14 Years DBA (started with 7.3.4)
▪I do it everywhere (also on Windows)
■RAC ATTACK Ninja & co-writer
■RAC SIG Board member
■OCP (11g, 12c, MySQL) & OCE
■Italian Living in Switzerland
■http://www.ludovicocaldara.net
■@ludodba
■ludovicocaldara

3. 2014 © Trivadis
Trivadis is a market leader in IT consulting, system integration, solution engineering and the provision of IT services focusing on and technologies in Switzerland, Germany and Austria.
We offer our services in the following strategic business fields: Trivadis Services takes over the interacting operation of your IT systems.
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About

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AGENDA
1.Real-Time Cascade Standby
2.Far-Sync Instances
3.Other goodies ;-)
4.Q&A
02.10.2014
Oracle Active Data Guard 12c
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02.10.2014
Oracle Active Data Guard 12c
Real-Time Cascade Standby
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Cascade Standby
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PRIMARY
CASCADING
CASCADED

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Cascade Standby in 11gR2
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ARCH or LGWR (SYNC, ASYNC)
ARCH
ONLY!!
Supported by
the broker
Not possible with 11g broker! Only manual configuration of LOG_ARCHIVE_DEST_n!

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Cascade Standby in 12cR1
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SYNC, FASTSYNC or
ASYNC (LGWR)
ASYNC (LGWR)
<none> (ARCH)
Cascade now supported by
the 12c broker

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Cascade Standby in 12cR1
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SYNC, FASTSYNC or ASYNC (LGWR)
ASYNC (LGWR) <none> (ARCH)
Cascade now supported by
the 12c broker

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Cascade Standby in 12cR1
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SYNC, FASTSYNC or
ASYNC (LGWR)
ASYNC (LGWR) <none> (ARCH)
Cascade now supported by the 12c broker

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Cascade Standby Without Broker
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PROD
DR
REP

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Cascade Standby Without Broker
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PROD
LOG_ARCHIVE_DEST_2=‘SERVICE=DR, SYNC AFFIRM
VALID_FOR=(ONLINE_LOGFILES,PRIMARY_ROLE)’
DR
REP

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Cascade Standby Without Broker
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PROD
LOG_ARCHIVE_DEST_2=‘SERVICE=DR, SYNC AFFIRM
VALID_FOR=(ONLINE_LOGFILES,PRIMARY_ROLE)’
DR
REP
LOG_ARCHIVE_DEST_2=‘SERVICE=REP, ASYNC NOAFFIRM VALID_FOR=(STANDBY_LOGFILES, STANDBY_ROLE)’

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Cascade Standby Without Broker
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PROD
LOG_ARCHIVE_DEST_2=‘SERVICE=DR, SYNC AFFIRM
VALID_FOR=(ONLINE_LOGFILES,PRIMARY_ROLE)’
DR
REP
LOG_ARCHIVE_DEST_2=‘SERVICE=REP, ASYNC NOAFFIRM VALID_FOR=(STANDBY_LOGFILES, STANDBY_ROLE)’
REAL-TIME CASCADE AND ACTIVE DATA GUARD

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Cascade Standby Without Broker
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PROD
LOG_ARCHIVE_DEST_2=‘SERVICE=DR, SYNC AFFIRM
VALID_FOR=(ONLINE_LOGFILES,PRIMARY_ROLE)’
DR
REP
LOG_ARCHIVE_DEST_2=‘SERVICE=DR, SYNC AFFIRM
VALID_FOR=(ONLINE_LOGFILES,PRIMARY_ROLE)’
LOG_ARCHIVE_DEST_2=‘SERVICE=REP, ASYNC NOAFFIRM VALID_FOR=(STANDBY_LOGFILES, STANDBY_ROLE)’

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Cascade Standby Without Broker
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PROD
LOG_ARCHIVE_DEST_2=‘SERVICE=DR, SYNC AFFIRM
VALID_FOR=(ONLINE_LOGFILES,PRIMARY_ROLE)’
DR
REP
LOG_ARCHIVE_DEST_2=‘SERVICE=DR, SYNC AFFIRM
VALID_FOR=(ONLINE_LOGFILES,PRIMARY_ROLE)’
LOG_ARCHIVE_DEST_2=‘SERVICE=PROD, ASYNC NOAFFIRM
VALID_FOR=(STANDBY_LOGFILES,STANDBY_ROLE)’
LOG_ARCHIVE_DEST_2=‘SERVICE=REP, ASYNC NOAFFIRM VALID_FOR=(STANDBY_LOGFILES, STANDBY_ROLE)’

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Cascade Standby with 12cR1 Broker
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PROD
DR
REP
RedoRoutes=‘(LOCAL : DR)’
RedoRoutes=‘ (PROD : REP ASYNC) (REP : PROD ASYNC) (LOCAL : REP , PROD)’
RedoRoutes=‘(LOCAL:DR)’

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Cascade Standby with 12cR1 Broker
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PROD
DR
REP
RedoRoutes=‘(LOCAL : DR)’
RedoRoutes=‘ (PROD : REP ASYNC) (REP : PROD ASYNC) (LOCAL : REP , PROD)’
RedoRoutes=‘(LOCAL:DR)’

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Cascade Standby with 12cR1 Broker
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PROD
DR
REP
RedoRoutes=‘(LOCAL : DR)’
RedoRoutes=‘ (PROD : REP ASYNC) (REP : PROD ASYNC) (LOCAL : REP , PROD)’
RedoRoutes=‘(LOCAL:DR)’
REAL-TIME CASCADE AND ACTIVE DATA GUARD

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Real-Time Cascade: Little demo?
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O12p01
PROD
O12p02
DR
O12p03
REP

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Oracle Active Data Guard 12c
Far-Sync Instances
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High distances = High latencies
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Too far to support SYNC
redo-transport
ASYNC ONLY!!

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Solution with 11gR2
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ASYNC REMOTE
SYNC
LOCAL

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Solution with 11gR2
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ASYNC REMOTE
SYNC
LOCAL

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Solution with 12cR1
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FAR_SYNC
Instance
SYNC
LOCAL
ASYNC
REMOTE

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Solution with 12cR1
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FAR_SYNC
Instance
SYNC
LOCAL
ASYNC
REMOTE

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Solution with 12cR1
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FAR_SYNC
Instance
SYNC
LOCAL
ASYNC
REMOTE

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Solution with 12cR1
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FAR_SYNC
Instance
SYNC
LOCAL
ASYNC
REMOTE

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FAR_SYNC instance characteristics
1.Special controlfile
ALTER DATABASE CREATE FAR SYNC INSTANCE CONTROLFILE;
2.NO datafiles and NO redo-apply
3.Standby logs are written and archived
4.The redo stream is redirected to the standby
5.Can’t be opened or converted to standby or primary
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Oracle Active Data Guard 12c

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One FAR_SYNC for each location
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SYNC
LOCAL
ASYNC REMOTE
FS_PROD
FS_DR
PROD
DR
REP

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One FAR_SYNC for each location
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SYNC
LOCAL
ASYNC
REMOTE
FS_PROD
FS_DR
PROD
DR
REP

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FAR_SYNC instances: Little demo?
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O12p01
PROD
O12p02
DR
O12p03
REP
O12f01
PRODFS
O12f02
DRFS

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Oracle Active Data Guard 12c
Other goodies ;-)
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FASTSYNC Log Transport Mode
1.table
2.No need to acknowledge the write on remote Standby Logs
3.Can be used with Maximum Availability
4.The commit overhead is due by the network only and not by the remote disk latencies
LogXptMode
Transport
Acknowledge
SYNC
SYNC
AFFIRM
ASYNC
ASYNC
NOAFFIRM
FASTSYNC
SYNC
NOAFFIRM
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Oracle Active Data Guard 12c

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Temporary UNDO: GTTs for ADG!
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UNDO
TBS
TEMP
TBS
TEMP_UNDO_ENABLED = TRUE
GLOBAL
TEMPORARY
TABLE
DATA
TBS
SYSTEM
TBS
DATA &
UNDO
READ ONLY DATAFILES

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Temporary UNDO: GTTs for ADG!
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UNDO
TBS
TEMP
TBS
TEMP_UNDO_ENABLED = TRUE
GLOBAL
TEMPORARY
TABLE
DATA
TBS
SYSTEM
TBS
DATA &
UNDO
READ ONLY DATAFILES

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Sequence support
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ASKS FOR A SET OF USABLE SEQUENCES
PRIMARY
STANDBY

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Sequence support
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ASKS FOR A SET OF USABLE SEQUENCES
PRIMARY
STANDBY

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Sequence support
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ASKS FOR A SET OF USABLE SEQUENCES
PRIMARY
STANDBY

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VALIDATE DATABASE
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DGMGRL> VALIDATE DATABASE ‘DR';
Database Role: Physical standby database
Primary Database: South_Sales
Ready for Switchover: Yes
Ready for Failover: Yes (Primary Running)
Flashback Database Status:
PROD: On
DR: Off
. . .

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VALIDATE DATABASE
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DGMGRL> VALIDATE DATABASE ‘DR';
Database Role: Physical standby database
Primary Database: South_Sales
Ready for Switchover: Yes
Ready for Failover: Yes (Primary Running)
Flashback Database Status:
PROD: On
DR: Off
. . .

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VALIDATE DATABASE
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DGMGRL> VALIDATE DATABASE ‘DR';
Database Role: Physical standby database
Primary Database: South_Sales
Ready for Switchover: Yes
Ready for Failover: Yes (Primary Running)
Flashback Database Status:
PROD: On
DR: Off
. . .

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SQL Apply & Rolling Upgrades
1.SQL Apply enhanced:
Text, Multimedia, Spatial
Virtual columns
Securefiles with dedup.
2.New DBMS_ROLLING is simplifying rolling upgrades
Easy syntax and flow
Needs Active Data Guard Option (again )
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Oracle Active Data Guard 12c

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Other DataGuard improvements
1.New property ApplyLagThreshold raises a warning when the apply lag is too high (useless with DelayMins parameter)
2.New property TransportLagThreshold raises a warning when the transport lag is too high
3.New administrative privilege SYSDG (dgdba OS group)
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Oracle Active Data Guard 12c

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Two words about DG & Multitenant
1.Shared redo stream = The whole CDB has one role at time
2.No PDB granularity
3.All standby commands must be run into the root CDB
4.Creating PDB from seed is ok
5.Cloning PDBs depends on ADG
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Oracle Active Data Guard 12c

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Two words about Global Data Services
1.Evolution of Connection Manager
2.Slightly integrated with DG, GG, Advanced Replication
3.As of now, it works only when using Policy-Managed Clusters
4.Intelligent routing based on apply lag, region, workload
5.Requires ADG or GG licenses
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Oracle Active Data Guard 12c

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Questions and answers ...
BASEL BERN BRUGG LAUSANNE ZUERICH DUESSELDORF FRANKFURT A.M. FREIBURG I.BR. HAMBURG MUNICH STUTTGART VIENNA
Ludovico Caldara Oracle ACE, Senior Oracle Consultant
ludovico.caldara@trivadis.com @ludodba
02.10.2014
Oracle Active Data Guard 12c
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