Quelle  lock_secondary.test  Sprache: unbekannt

--source include/have_innodb.inc

--echo #
--echo # MDEV-37753 lock_sec_rec_some_has_impl() unnecessarily fetches history
--echo #
CREATE TABLE t(a INT PRIMARY KEY, b TEXT, UNIQUE(b(1)))
ENGINE=InnoDB STATS_PERSISTENT=0;

connect (purge_control,localhost,root,,);
START TRANSACTION WITH CONSISTENT SNAPSHOT;
connection default;
SET GLOBAL innodb_max_purge_lag_wait=1;

INSERT INTO t VALUES
(1,REPEAT('x',@@innodb_page_size/2)),(2,REPEAT('z',@@innodb_page_size/2));
DELETE FROM t;

SELECT variable_value INTO @reads
FROM information_schema.global_status
WHERE variable_name = 'INNODB_BUFFER_POOL_READ_REQUESTS';

INSERT INTO t VALUES(0,'y'),(1,'x'),(2,'z');

SELECT variable_value-@reads INTO @diff
FROM information_schema.global_status
WHERE variable_name = 'INNODB_BUFFER_POOL_READ_REQUESTS';

# Typically, this reports 24 pages accessed.
# If the fix is absent, we would access at least 26 pages.
SELECT if(@diff between 22 and 26,'ok',@diff);
disconnect purge_control;

DROP TABLE t;