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#
# UPDATE LOW_PRIORITY
#
--source have_engine.inc
--source include/count_sessions.inc
--disable_warnings
DROP TABLE IF EXISTS t1;
--enable_warnings
--source create_table.inc
INSERT INTO t1 (a,b) VALUES (11,'foobar'),(12,'b');
# We will have 3 connections:
# con1 will start SELECT which should give us enough time;
# default will run UPDATE
# con2 will then start another SELECT.
# With LOW_PRIORITY_UPDATES = 0,
# with standard UPDATE we should see old data in con1 resultset,
# but new data in con2 resultset.
# With UPDATE LOW_PRIORITY we should see old data in both resultsets.
# Then we will set LOW_PRIORITY_UPDATES to 1.
# Then with standard UPDATE we should also see old data in both resultsets.
SET LOW_PRIORITY_UPDATES = 0;
SET lock_wait_timeout = 4;
# Normal UPDATE with low_priority_updates=0
--connect (con1,localhost,root,,)
SET lock_wait_timeout = 2;
--send
SELECT a+SLEEP(1) FROM t1;
--connection default
let $show_statement = SHOW PROCESSLIST;
let $field = State;
let $condition = = 'User sleep';
# We don't need to wait long,
# if the feature works, threads
# should show up in the processlist right away
let $wait_timeout = 2;
--source include/wait_show_condition.inc
--send
UPDATE t1 SET a=a+10;
--connect (con2,localhost,root,,)
SET lock_wait_timeout = 3;
let $field = Info;
let $condition = = 'UPDATE t1 SET a=a+10';
let $wait_timeout = 2;
--source include/wait_show_condition.inc
if (!$found)
{
--let $mysql_errname = timeout in wait_show_condition.inc
--let $functionality = Table locking
--source unexpected_result.inc
}
--sorted_result
SELECT a+SLEEP(1) FROM t1;
--connection con1
--sorted_result
--reap
--connection default
--reap
if ($mysql_errname)
{
--let $my_last_stmt = UPDATE t1 SET a=a+10
--let $functionality = UPDATE
--source unexpected_result.inc
}
--sorted_result
SELECT a,b FROM t1;
# UPDATE LOW_PRIORITY
--connection con1
--send
SELECT a+SLEEP(1) FROM t1;
--connection default
let $field = State;
let $condition = = 'User sleep';
let $wait_timeout = 2;
--source include/wait_show_condition.inc
--send
UPDATE LOW_PRIORITY t1 SET a=a+20;
--connection con2
let $field = Info;
let $condition = = 'UPDATE LOW_PRIORITY t1 SET a=a+20';
let $wait_timeout = 2;
--source include/wait_show_condition.inc
--sorted_result
SELECT a+SLEEP(1) FROM t1;
--connection con1
--sorted_result
--reap
--connection default
--reap
--sorted_result
SELECT a,b FROM t1;
SET LOW_PRIORITY_UPDATES = 1;
# Normal UPDATE with low_priority_updates=1
--connection con1
--send
SELECT a+SLEEP(1) FROM t1;
--connection default
let $field = State;
let $condition = = 'User sleep';
let $wait_timeout = 2;
--source include/wait_show_condition.inc
--send
UPDATE t1 SET a=a+30;
--connection con2
let $field = Info;
let $condition = = 'UPDATE t1 SET a=a+30';
let $wait_timeout = 2;
--source include/wait_show_condition.inc
if (!$found)
{
--let $mysql_errname = timeout in wait_show_condition.inc
--let $functionality = Table locking
--source unexpected_result.inc
}
--sorted_result
SELECT a+SLEEP(1) FROM t1;
--connection con1
--sorted_result
--reap
--connection default
--reap
if ($mysql_errname)
{
--let $my_last_stmt = UPDATE t1 SET a=a+30
--let $functionality = UPDATE
--source unexpected_result.inc
}
--sorted_result
SELECT a,b FROM t1;
--disconnect con1
--disconnect con2
--connection default
# Cleanup
DROP TABLE t1;
--source include/wait_until_count_sessions.inc
--source cleanup_engine.inc
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