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# WL#8017 Infrastructure for Optimizer Hints # MAX_EXECUTION_TIME hint testing # MAX_EXECUTION_TIME hint testing CREATE TABLE t1 (a INT, b VARCHAR(300)); INSERT INTO t1 VALUES (1, 'string'); INSERT INTO t1 SELECT * FROM t1; INSERT INTO t1 SELECT * FROM t1; INSERT INTO t1 SELECT * FROM t1; INSERT INTO t1 SELECT * FROM t1; INSERT INTO t1 SELECT * FROM t1; INSERT INTO t1 SELECT * FROM t1; INSERT INTO t1 SELECT * FROM t1; INSERT INTO t1 SELECT * FROM t1; INSERT INTO t1 SELECT * FROM t1; INSERT INTO t1 SELECT * FROM t1; INSERT INTO t1 SELECT * FROM t1; SELECT /*+ MAX_EXECUTION_TIME(1) */ * FROM t1 a, t1 b; ERROR HY000: Query execution was interrupted, maximum statement execution time exceeded EXPLAIN SELECT /*+ MAX_EXECUTION_TIME(10) MAX_EXECUTION_TIME(100) */ * FROM t1; id select_type table partitions type possible_keys key key_len ref rows filtered Extra 1 SIMPLE t1 NULL ALL NULL NULL NULL NULL 2048 100.00 NULL Warnings: Warning 3126 Hint MAX_EXECUTION_TIME(100) is ignored as conflicting/duplicated Note 1003 /* select#1 */ select /*+ MAX_EXECUTION_TIME(10) */ `test`.`t1`.`a` AS `a`,`test`.`t1`.`b` AS `b` from `test`.`t1` DROP TABLE t1; # test the MAX_EXECUTION_TIME hint for SELECT statements: CREATE TABLE t1 (i INT, j INT); CREATE INDEX i1 ON t1(i); CREATE INDEX i2 ON t1(j); INSERT INTO t1 VALUES (1, 1), (2, 2); SELECT /*+ MAX_EXECUTION_TIME(4294967296) */ 1 FROM t1; 1 1 1 Warnings: Warning 1064 Unsupported MAX_EXECUTION_TIME near ') */ 1 FROM t1' at line 1 SELECT /*+ MAX_EXECUTION_TIME(1) */ *, SLEEP(1000) FROM t1; ERROR HY000: Query execution was interrupted, maximum statement execution time exceeded SELECT /*+ MAX_EXECUTION_TIME(1) */ *, SLEEP(1000) FROM t1 UNION SELECT 1, 2, 3; ERROR HY000: Query execution was interrupted, maximum statement execution time exceeded (SELECT /*+ MAX_EXECUTION_TIME(1) */ *, SLEEP(1000) FROM t1) UNION (SELECT 1, 2, 3); ERROR HY000: Query execution was interrupted, maximum statement execution time exceeded ((SELECT /*+ MAX_EXECUTION_TIME(1) */ *, SLEEP(1000) FROM t1)); ERROR HY000: Query execution was interrupted, maximum statement execution time exceeded # only SELECT statements supports the MAX_EXECUTION_TIME hint (warning): CREATE TABLE t2 (i INT); INSERT /*+ MAX_EXECUTION_TIME(1) */ INTO t2 SELECT 1; Warnings: Warning 3125 MAX_EXECUTION_TIME hint is supported by top-level standalone SELECT statements only REPLACE /*+ MAX_EXECUTION_TIME(1) */ INTO t2 SELECT 1; Warnings: Warning 3125 MAX_EXECUTION_TIME hint is supported by top-level standalone SELECT statements only UPDATE /*+ MAX_EXECUTION_TIME(1) */ t2 SET i = 1; Warnings: Warning 3125 MAX_EXECUTION_TIME hint is supported by top-level standalone SELECT statements only DELETE /*+ MAX_EXECUTION_TIME(1) */ FROM t2 WHERE i = 1; Warnings: Warning 3125 MAX_EXECUTION_TIME hint is supported by top-level standalone SELECT statements only DROP TABLE t1, t2; SELECT 1 FROM (SELECT /*+ MAX_EXECUTION_TIME(10) */ 1) a; 1 1 Warnings: Warning 3125 MAX_EXECUTION_TIME hint is supported by top-level standalone SELECT statements only CREATE FUNCTION f1() RETURNS INT BEGIN SELECT /*+ MAX_EXECUTION_TIME(10) */ 1 INTO @a; RETURN 1; END| Warnings: Warning 3125 MAX_EXECUTION_TIME hint is supported by top-level standalone SELECT statements only DROP FUNCTION f1;