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Diffstat (limited to 'mysql-test/r/flush.result')
| -rw-r--r-- | mysql-test/r/flush.result | 23 |
1 files changed, 23 insertions, 0 deletions
diff --git a/mysql-test/r/flush.result b/mysql-test/r/flush.result index bbfea2dade8..e36cd8a478f 100644 --- a/mysql-test/r/flush.result +++ b/mysql-test/r/flush.result @@ -466,3 +466,26 @@ ALTER TABLE t1 COMMENT 'test'; ERROR HY000: Table 't1' was locked with a READ lock and can't be updated UNLOCK TABLES; DROP TABLE t1; +# +# Test for bug #12641342 - "61401: UPDATE PERFORMANCE DEGRADES +# GRADUALLY IF A TRIGGER EXISTS". +# +# One of side-effects of this bug was that a transaction which +# involved DML statements requiring prelocking blocked concurrent +# FLUSH TABLES WITH READ LOCK for the whole its duration, while +# correct behavior in this case is to block FTWRL only for duration +# of individual DML statements. +DROP TABLE IF EXISTS t1; +CREATE TABLE t1 (id INT PRIMARY KEY, value INT); +INSERT INTO t1 VALUES (1, 1); +CREATE TRIGGER t1_au AFTER UPDATE ON t1 FOR EACH ROW SET @var = "a"; +BEGIN; +UPDATE t1 SET value= value + 1 WHERE id = 1; +# Switching to connection 'con1'. +# The below FLUSH TABLES WITH READ LOCK should succeed and +# should not be blocked by the transaction in default connection. +FLUSH TABLES WITH READ LOCK; +UNLOCK TABLES; +# Switching to connection 'default'. +COMMIT; +DROP TABLE t1; |