Quelle  page_cleaner.test  Sprache: unbekannt

--source include/have_innodb.inc
--source include/have_sequence.inc

SET @save_pct= @@GLOBAL.innodb_max_dirty_pages_pct;
SET @save_pct_lwm= @@GLOBAL.innodb_max_dirty_pages_pct_lwm;

SET GLOBAL innodb_max_dirty_pages_pct_lwm=0.0;
SET GLOBAL innodb_max_dirty_pages_pct=0.0;

CREATE TABLE t(a INT) ENGINE=InnoDB STATS_PERSISTENT=0;
--connect (prevent_purge,localhost,root)
START TRANSACTION WITH CONSISTENT SNAPSHOT;
--connection default
SET GLOBAL innodb_max_purge_lag_wait=0;

let $wait_condition =
SELECT variable_value = 0
FROM information_schema.global_status
WHERE variable_name = 'INNODB_BUFFER_POOL_PAGES_DIRTY';
--source include/wait_condition.inc

SET GLOBAL innodb_max_dirty_pages_pct=90.0;
--disable_cursor_protocol
select variable_value into @innodb_async_writes_total_count_before
 from information_schema.global_status
 where variable_name='innodb_async_writes_total_count';
--enable_cursor_protocol

--disable_cursor_protocol
SELECT variable_value INTO @log_writes FROM information_schema.global_status
WHERE variable_name='innodb_log_writes';
--enable_cursor_protocol

BEGIN;
--disable_query_log
let $N=500;
while ($N) {
  INSERT INTO t SELECT * FROM seq_1_to_10;
  dec $N;
}
--enable_query_log
ROLLBACK;

SELECT if(variable_value-@log_writes<500,'ok',variable_value-@log_writes)
FROM information_schema.global_status WHERE variable_name='innodb_log_writes';
--disconnect prevent_purge

SELECT variable_value>0 FROM information_schema.global_status
WHERE variable_name = 'INNODB_BUFFER_POOL_PAGES_DIRTY';

SET GLOBAL innodb_max_dirty_pages_pct=0.0;

# Without the MDEV-24917 fix, we would time out here.
--source include/wait_condition.inc

select (cast(variable_value as unsigned) >
 cast(@innodb_async_writes_total_count_before as unsigned))
 as innodb_async_writes_grow
 from information_schema.global_status
 where variable_name='innodb_async_writes_total_count';

DROP TABLE t;

SET GLOBAL innodb_max_dirty_pages_pct = @save_pct;
SET GLOBAL innodb_max_dirty_pages_pct_lwm = @save_pct_lwm;