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The Power of MySQL Explain
1.
<Insert Picture Here> The
Power of MySQL EXPLAIN Manyi Lu
2.
EXPLAIN: The Query
Execution Plan category JOIN film JOIN category film EXPLAIN returns a row of information for each "table" used in the SELECT statement. The "table" can be a real table, a derived or temporary table, a subquery, or a union result. Copyright © 2012 Oracle and/or its affiliates. All rights reserved.
3.
EXPLAIN in MySQL
5.5: Room for Improvement SELECT statements only What about INSERT, UPDATE, DELETE ? Tabular output Difficult to see the structure of the query plan More information would be useful E.g., When are the WHERE conditions evaluated? Shows the chosen plan, but does not tell you why this plan was chosen. Copyright © 2012 Oracle and/or its affiliates. All rights reserved.
4.
MySQL 5.6: EXPLAIN
for Data-Modifying Statements EXPLAIN UPDATE t1 SET b = 'b' WHERE a > 2 G id: 1 select_type: SIMPLE table: t1 type: range possible_keys: a,a_2 key: a key_len: 16 ref: null rows: 2 Extra: Using where; Using temporary Copyright © 2012 Oracle and/or its affiliates. All rights reserved.
5.
MySQL 5.6: EXPLAIN
for Data-Modifying Statements, cont. EXPLAIN INSERT INTO t1 SELECT * FROM t2 WHERE a IN (1, 3, 5) G id: 1 select_type: SIMPLE table: t2 type: range possible_keys: t2i1 key: t2i1 key_len: 4 ref: null rows: 3 Extra: Using index condition Copyright © 2012 Oracle and/or its affiliates. All rights reserved.
6.
MySQL 5.6: Structured
EXPLAIN EXPLAIN FORMAT=JSON SELECT * FROM t2 WHERE i > 1 AND j < 3; { "query_block": { "select_id": 1, "table": { "table_name": "t2", "access_type": "range", "possible_keys": [ "PRIMARY" ] /* possible_keys */, ... Copyright © 2012 Oracle and/or its affiliates. All rights reserved.
7.
MySQL 5.6: Structured
EXPLAIN, cont. ... "key": "PRIMARY", "key_length": "4", "rows": 2, "filtered": 100, "index_condition": "(`test`.`t2`.`i` > 1)", "attached_condition": "(`test`.`t2`.`j` < 3)" } /* table */ } /* query_block */ } Copyright © 2012 Oracle and/or its affiliates. All rights reserved.
8.
Structured EXPLAIN:
View with JSON Plugin in Browser for Expand/Collapse { - query_block: { select_id: 1, - nested_loop: [ - { + table: { … } }, - { + table: { … } } ] } } Copyright © 2012 Oracle and/or its affiliates. All rights reserved.
9.
Structured EXPLAIN:
View with JSON Plugin in Browser for Expand/Collapse, cont. { - query_block: { select_id: 1, - nested_loop: [ - { - table: { table_name: "t1", access_type: "ALL", rows: 3, filtered: 100, attached_condition: "(`test`.`t1`.`j` > 1)" } }, ... Copyright © 2012 Oracle and/or its affiliates. All rights reserved.
10.
Structured EXPLAIN: Subqueries EXPLAIN
FORMAT=JSON SELECT * FROM (SELECT * FROM t1) t; { - query_block: { select_id: 1, - table: { table_name: "t", access_type: "ALL", rows: 3, filtered: 100, + materialized_from_subquery: { … } } } } Copyright © 2012 Oracle and/or its affiliates. All rights reserved.
11.
Optimizer Traces: Query
Plan Debugging SET SESSION.OPTIMIZER_TRACE=‘enabled=on’; "rows_estimation": [ { SELECT v FROM t1 WHERE i1 = 1 AND v = 'a'; "table": "`t1`", SELECT * FROM INFORMATION_SCHEMA.OPTIMIZER_TRACE; "range_analysis": { "table_scan": { "rows": 5, "cost": 4.1 }, "potential_range_indices": [ { "index": "v_idx", • EXPLAIN shows the generated plan "usable": true, "key_parts": [ • TRACE shows how the plan was generated, "v", "i1" decision points etc. ] } • JSON format ], "best_covering_index_scan": { • Developers, support, advanced customers "index": "v_idx", "cost": 2.0063, "chosen": true } , Copyright © 2012 Oracle and/or its affiliates. All rights reserved.