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mariadb/mysql-test/include/concurrent.inc
Marko Mäkelä 1a6f470464 MDEV-19544 Remove innodb_locks_unsafe_for_binlog 
The transaction isolation levels READ COMMITTED and READ UNCOMMITTED
should behave similarly to the old deprecated setting
innodb_locks_unsafe_for_binlog=1, that is, avoid acquiring gap locks.

row_search_mvcc(): Reduce the scope of some variables, and clean up
the initialization and use of the variable set_also_gap_locks.
2019-05-23 10:25:12 +03:00

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# include/concurrent.inc
#
# Concurrent tests for transactional storage engines, mainly in UPDATE's
# Bug#3300
# Designed and tested by Sinisa Milivojevic, sinisa@mysql.com
#
# These variables have to be set before sourcing this script:
# TRANSACTION ISOLATION LEVEL REPEATABLE READ
# innodb_locks_unsafe_for_binlog 0 (default) or 1 (by
# --innodb_locks_unsafe_for_binlog)
# $engine_type storage engine to be tested
#
# Last update:
# 2009-02-13 HH "Release_lock("hello")" is now also successful when delivering NULL,
# replaced two sleeps by wait_condition. The last two "sleep 1" have not been
# replaced as all tried wait conditions leaded to nondeterministic results, especially
# to succeeding concurrent updates. To replace the sleeps there should be some time
# planned (or internal knowledge of the server may help).
# 2006-08-02 ML test refactored
# old name was t/innodb_concurrent.test
# main code went into include/concurrent.inc
# 2008-06-03 KP test refactored; removed name locks, added comments.
# renamed wrapper t/concurrent_innodb.test ->
# t/concurrent_innodb_unsafelog.test
# new wrapper t/concurrent_innodb_safelog.test
#
connection default;
SET SQL_MODE="";
#
# Show prerequisites for this test.
#
SELECT @@global.tx_isolation;
#
# With the transaction isolation level REPEATABLE READ (the default)
# or SERIALIZEBLE, InnoDB takes "next-key locks"/"gap locks". This means it
# locks the gap before the keys that it accessed to find the rows to
# use for a statement. In this case we have to expect some more lock
# wait timeouts in the tests, compared to READ UNCOMMITTED or READ COMMITTED.
# For READ UNCOMMITTED or READ COMMITTED, no "next-key locks"/"gap locks"
# are taken and locks on keys that do not match the WHERE condition are
# released. Hence fewer lock collisions occur.
# We use the variable $keep_locks to set the expectations for
# lock wait timeouts accordingly.
#
let $keep_locks= `SELECT @@global.tx_isolation IN ('REPEATABLE-READ','SERIALIZABLE')`;
--echo # keep_locks == $keep_locks
#
# Set up privileges and remove user level locks, if exist.
#
GRANT USAGE ON test.* TO mysqltest@localhost;
--echo
--echo **
--echo ** two UPDATE's running and both changing distinct result sets
--echo **
connect (thread1, localhost, mysqltest,,);
connection thread1;
--echo ** Set up table
eval SET SESSION STORAGE_ENGINE = $engine_type;
create table t1(eta int(11) not null, tipo int(11), c varchar(255));
insert into t1 values (7,7, "aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa");
insert into t1 values (8,8, "bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb");
insert into t1 values (10,1,"ccccccccccccccccccccccccccccccccccccccccccc");
insert into t1 values (20,2,"ddddddddddddddddddddddddddddddddddddddddddd");
insert into t1 values (30,1,"eeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee");
insert into t1 values (40,2,"fffffffffffffffffffffffffffffffffffffffffff");
insert into t1 values (50,1,"ggggggggggggggggggggggggggggggggggggggggggg");
insert into t1 values (60,2,"hhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhh");
insert into t1 values (70,1,"iiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiii");
insert into t1 values (80,22,"jjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjj");
insert into t1 values (90,11,"kkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkk");
--echo ** Get user level lock (ULL) for thread 1
select get_lock("hello",10);
connect (thread2, localhost, mysqltest,,);
connection thread2;
--echo ** Start transaction for thread 2
begin;
--echo ** Update will cause a table scan and a new ULL will
--echo ** be created and blocked on the first row where tipo=11.
send update t1 set eta=1+get_lock("hello",10)*0 where tipo=11;
connection thread1;
let $wait_condition= select count(*)= 1 from information_schema.processlist where state= 'User lock';
--source include/wait_condition.inc
--echo ** Start new transaction for thread 1
begin;
--echo ** Update on t1 will cause a table scan which will be blocked because
--echo ** the previously initiated table scan applied exclusive key locks on
--echo ** all primary keys.
--echo ** Not so for READ UNCOMMITTED or READ COMMITTED. The locks that
--echo ** do not match the WHERE condition are released.
if ($keep_locks)
{
--error ER_LOCK_WAIT_TIMEOUT
update t1 set eta=2 where tipo=22;
}
if (!$keep_locks)
{
update t1 set eta=2 where tipo=22;
}
--echo ** Release user level name lock from thread 1. This will cause the ULL
--echo ** on thread 2 to end its wait.
# Due to Bug#32782 User lock hash fails to find lock, which probably also cause Bug#39484 (main.concurrent_innodb_safelog fails sporadically) the success of the following
# is also guaranteed for NULL. Replaced SELECT by DO (no result).
DO release_lock("hello");
--echo ** Table is now updated with a new eta on tipo=22 for thread 1.
select * from t1;
connection thread2;
--echo ** Release the lock and collect result from update on thread 2
reap;
# Due to Bug#32782 User lock hash fails to find lock, which probably also cause Bug#39484 (main.concurrent_innodb_safelog fails sporadically) the success of the following
# is also guaranteed for NULL. Replaced SELECT by DO (no result).
DO release_lock("hello");
--echo ** Table should have eta updates where tipo=11 but updates made by
--echo ** thread 1 shouldn't be visible yet.
select * from t1;
--echo ** Sending commit on thread 2.
commit;
connection thread1;
--echo ** Make sure table reads didn't change yet on thread 1.
select * from t1;
--echo ** And send final commit on thread 1.
commit;
--echo ** Table should now be updated by both updates in the order of
--echo ** thread 1,2.
select * from t1;
connection thread2;
--echo ** Make sure the output is similar for t1.
select * from t1;
connection thread1;
select * from t1;
connection default;
drop table t1;
--echo
--echo **
--echo ** two UPDATE's running and one changing result set
--echo **
#connect (thread1, localhost, mysqltest,,);
connection thread1;
--echo ** Set up table
eval SET SESSION STORAGE_ENGINE = $engine_type;
create table t1(eta int(11) not null, tipo int(11), c varchar(255));
insert into t1 values (7,7, "aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa");
insert into t1 values (8,8, "bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb");
insert into t1 values (10,1,"ccccccccccccccccccccccccccccccccccccccccccc");
insert into t1 values (20,2,"ddddddddddddddddddddddddddddddddddddddddddd");
insert into t1 values (30,1,"eeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee");
insert into t1 values (40,2,"fffffffffffffffffffffffffffffffffffffffffff");
insert into t1 values (50,1,"ggggggggggggggggggggggggggggggggggggggggggg");
insert into t1 values (60,2,"hhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhh");
insert into t1 values (70,1,"iiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiii");
insert into t1 values (80,22,"jjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjj");
insert into t1 values (90,11,"kkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkk");
--echo ** Get ULL "hello" on thread 1
select get_lock("hello",10);
#connect (thread2, localhost, mysqltest,,);
connection thread2;
--echo ** Start transaction on thread 2
begin;
--echo ** Update will cause a table scan.
--echo ** This will cause a hang on the first row where tipo=1 until the
--echo ** blocking ULL is released.
send update t1 set eta=1+get_lock("hello",10)*0 where tipo=1;
connection thread1;
let $wait_condition= select count(*)= 1 from information_schema.processlist where state= 'User lock';
--source include/wait_condition.inc
--echo ** Start transaction on thread 1
begin;
--echo ** Update on t1 will cause a table scan which will be blocked because
--echo ** the previously initiated table scan applied exclusive key locks on
--echo ** all primary keys.
--echo ** Not so for READ UNCOMMITTED or READ COMMITTED. The locks that
--echo ** do not match the WHERE condition are released.
if ($keep_locks)
{
--error ER_LOCK_WAIT_TIMEOUT
update t1 set tipo=1 where tipo=2;
}
if (!$keep_locks)
{
update t1 set tipo=1 where tipo=2;
}
--echo ** Release ULL. This will release the next waiting ULL on thread 2.
# Due to Bug#32782 User lock hash fails to find lock, which probably also cause Bug#39484 (main.concurrent_innodb_safelog fails sporadically)the success of the following
# is also guaranteed for NULL. Replaced SELECT by DO (no result).
DO release_lock("hello");
--echo ** The table should still be updated with updates for thread 1 only:
select * from t1;
connection thread2;
--echo ** Release the lock and collect result from thread 2:
reap;
# Due to Bug#32782 User lock hash fails to find lock, which probably also cause Bug#39484 (main.concurrent_innodb_safelog fails sporadically) the success of the following
# is also guaranteed for NULL. Replaced SELECT by DO (no result).
DO release_lock("hello");
--echo ** Seen from thread 2 the table should have been updated on four
--echo ** places.
select * from t1;
commit;
connection thread1;
--echo ** Thread 2 has committed but the result should remain the same for
--echo ** thread 1 (updated on three places):
select * from t1;
commit;
--echo ** After a commit the table should be merged with the previous
--echo ** commit.
--echo ** This select should show both updates:
select * from t1;
connection thread2;
select * from t1;
connection thread1;
select * from t1;
connection default;
drop table t1;
--echo
--echo **
--echo ** One UPDATE and one INSERT .... Monty's test
--echo **
#connect (thread1, localhost, mysqltest,,);
connection thread1;
--echo ** Set up table
eval SET SESSION STORAGE_ENGINE = $engine_type;
create table t1 (a int not null, b int not null);
insert into t1 values (1,1),(2,1),(3,1),(4,1);
--echo ** Create ULL 'hello2'
select get_lock("hello2",10);
#connect (thread2, localhost, mysqltest,,);
connection thread2;
--echo ** Begin a new transaction on thread 2
begin;
--echo ** Update will create a table scan which creates a ULL where a=2;
--echo ** this will hang waiting on thread 1.
send update t1 set b=10+get_lock(concat("hello",a),10)*0 where a=2;
connection thread1;
let $wait_condition= select count(*)= 1 from information_schema.processlist where state= 'User lock';
--source include/wait_condition.inc
--echo ** Insert new values to t1 from thread 1; this created an implicit
--echo ** commit since there are no on-going transactions.
insert into t1 values (1,1);
--echo ** Release the ULL (thread 2 updates will finish).
# Due to Bug#32782 User lock hash fails to find lock, which probably also cause Bug#39484 (main.concurrent_innodb_safelog fails sporadically) the success of the following
# is also guaranteed for NULL. Replaced SELECT by DO (no result).
DO release_lock("hello2");
--echo ** ..but thread 1 will still see t1 as if nothing has happend:
select * from t1;
connection thread2;
--echo ** Collect results from thread 2 and release the lock.
reap;
# Due to Bug#32782 User lock hash fails to find lock, which probably also cause Bug#39484 (main.concurrent_innodb_safelog fails sporadically) the success of the following
# is also guaranteed for NULL. Replaced SELECT by DO (no result).
DO release_lock("hello2");
--echo ** The table should look like the original+updates for thread 2,
--echo ** and consist of new rows:
select * from t1;
--echo ** Commit changes from thread 2
commit;
connection default;
drop table t1;
--echo
--echo **
--echo ** one UPDATE changing result set and SELECT ... FOR UPDATE
--echo **
#connect (thread1, localhost, mysqltest,,);
connection thread1;
--echo ** Set up table
eval SET SESSION STORAGE_ENGINE = $engine_type;
create table t1(eta int(11) not null, tipo int(11), c varchar(255));
insert into t1 values (7,7, "aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa");
insert into t1 values (8,8, "bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb");
insert into t1 values (10,1,"ccccccccccccccccccccccccccccccccccccccccccc");
insert into t1 values (20,2,"ddddddddddddddddddddddddddddddddddddddddddd");
insert into t1 values (30,1,"eeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee");
insert into t1 values (40,2,"fffffffffffffffffffffffffffffffffffffffffff");
insert into t1 values (50,1,"ggggggggggggggggggggggggggggggggggggggggggg");
insert into t1 values (60,2,"hhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhh");
insert into t1 values (70,1,"iiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiii");
insert into t1 values (80,22,"jjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjj");
insert into t1 values (90,11,"kkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkk");
#connect (thread2, localhost, mysqltest,,);
connection thread2;
--echo ** Begin a new transaction on thread 2
begin;
--echo ** Select a range for update.
select * from t1 where tipo=2 FOR UPDATE;
connection thread1;
--echo ** Begin a new transaction on thread 1
begin;
--echo ** Update the same range which is marked for update on thread 2; this
--echo ** will hang because of row locks.
--error ER_LOCK_WAIT_TIMEOUT
update t1 set tipo=1 where tipo=2;
--echo ** After the update the table will be unmodified because the previous
--echo ** transaction failed and was rolled back.
select * from t1;
connection thread2;
--echo ** The table should look unmodified from thread 2.
select * from t1;
--echo ** Sending a commit should release the row locks and enable
--echo ** thread 1 to complete the transaction.
commit;
connection thread1;
--echo ** Commit on thread 1.
commit;
connection thread2;
--echo ** The table should not have been changed.
select * from t1;
connection thread1;
--echo ** Even on thread 1:
select * from t1;
connection default;
drop table t1;
--echo
--echo **
--echo ** one UPDATE not changing result set and SELECT ... FOR UPDATE
--echo **
#connect (thread1, localhost, mysqltest,,);
connection thread1;
--echo ** Set up table
eval SET SESSION STORAGE_ENGINE = $engine_type;
create table t1(eta int(11) not null, tipo int(11), c varchar(255));
insert into t1 values (7,7, "aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa");
insert into t1 values (8,8, "bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb");
insert into t1 values (10,1,"ccccccccccccccccccccccccccccccccccccccccccc");
insert into t1 values (20,2,"ddddddddddddddddddddddddddddddddddddddddddd");
insert into t1 values (30,1,"eeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee");
insert into t1 values (40,2,"fffffffffffffffffffffffffffffffffffffffffff");
insert into t1 values (50,1,"ggggggggggggggggggggggggggggggggggggggggggg");
insert into t1 values (60,2,"hhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhh");
insert into t1 values (70,1,"iiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiii");
insert into t1 values (80,22,"jjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjj");
insert into t1 values (90,11,"kkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkk");
#connect (thread2, localhost, mysqltest,,);
connection thread2;
--echo ** Starting new transaction on thread 2.
begin;
--echo ** Starting SELECT .. FOR UPDATE
select * from t1 where tipo=2 FOR UPDATE;
connection thread1;
--echo
--echo ** Starting new transaction on thread 1
begin;
--echo ** Updating single row using a table scan. This will time out
--echo ** because of ongoing transaction on thread 1 holding lock on
--echo ** all primary keys in the scan.
--echo ** Not so for READ UNCOMMITTED or READ COMMITTED. The locks that
--echo ** do not match the WHERE condition are released.
if ($keep_locks)
{
--error ER_LOCK_WAIT_TIMEOUT
update t1 set tipo=11 where tipo=22;
}
if (!$keep_locks)
{
update t1 set tipo=11 where tipo=22;
}
--echo ** After the time out the transaction is aborted; no rows should
--echo ** have changed.
select * from t1;
connection thread2;
--echo ** The same thing should hold true for the transaction on
--echo ** thread 2
select * from t1;
send commit;
connection thread1;
commit;
connection thread2;
--echo ** Even after committing:
reap;
select * from t1;
connection thread1;
select * from t1;
connection default;
drop table t1;
--echo
--echo **
--echo ** two SELECT ... FOR UPDATE
--echo **
#connect (thread1, localhost, mysqltest,,);
connection thread1;
--echo ** Set up table
eval SET SESSION STORAGE_ENGINE = $engine_type;
create table t1(eta int(11) not null, tipo int(11), c varchar(255));
insert into t1 values (7,7, "aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa");
insert into t1 values (8,8, "bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb");
insert into t1 values (10,1,"ccccccccccccccccccccccccccccccccccccccccccc");
insert into t1 values (20,2,"ddddddddddddddddddddddddddddddddddddddddddd");
insert into t1 values (30,1,"eeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee");
insert into t1 values (40,2,"fffffffffffffffffffffffffffffffffffffffffff");
insert into t1 values (50,1,"ggggggggggggggggggggggggggggggggggggggggggg");
insert into t1 values (60,2,"hhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhh");
insert into t1 values (70,1,"iiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiii");
insert into t1 values (80,22,"jjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjj");
insert into t1 values (90,11,"kkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkk");
#connect (thread2, localhost, mysqltest,,);
connection thread2;
--echo ** Begin a new transaction on thread 2
begin;
select * from t1 where tipo=2 FOR UPDATE;
connection thread1;
--echo ** Begin a new transaction on thread 1
begin;
--echo ** Selecting a range for update by table scan will be blocked
--echo ** because of on-going transaction on thread 2.
--error ER_LOCK_WAIT_TIMEOUT
select * from t1 where tipo=1 FOR UPDATE;
connection thread2;
--echo ** Table will be unchanged and the select command will not be
--echo ** blocked:
select * from t1;
--echo ** Commit transacton on thread 2.
commit;
connection thread1;
--echo ** Commit transaction on thread 1.
commit;
connection thread2;
--echo ** Make sure table isn't blocked on thread 2:
select * from t1;
connection thread1;
--echo ** Make sure table isn't blocked on thread 1:
select * from t1;
connection default;
drop table t1;
--echo
--echo **
--echo ** one UPDATE changing result set and DELETE
--echo **
#connect (thread1, localhost, mysqltest,,);
connection thread1;
--echo ** Set up table
eval SET SESSION STORAGE_ENGINE = $engine_type;
create table t1(eta int(11) not null, tipo int(11), c varchar(255));
insert into t1 values (7,7, "aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa");
insert into t1 values (8,8, "bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb");
insert into t1 values (10,1,"ccccccccccccccccccccccccccccccccccccccccccc");
insert into t1 values (20,2,"ddddddddddddddddddddddddddddddddddddddddddd");
insert into t1 values (30,1,"eeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee");
insert into t1 values (40,2,"fffffffffffffffffffffffffffffffffffffffffff");
insert into t1 values (50,1,"ggggggggggggggggggggggggggggggggggggggggggg");
insert into t1 values (60,2,"hhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhh");
insert into t1 values (70,1,"iiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiii");
insert into t1 values (80,22,"jjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjj");
insert into t1 values (90,11,"kkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkk");
#connect (thread2, localhost, mysqltest,,);
connection thread2;
begin;
send delete from t1 where tipo=2;
# The sleep has not been replaced as all tried wait conditions leaded to sporadically
# succeding update in the following thread. Also the used status variables '%lock%' and
# 'innodb_deleted_rows' and infos in processlist where not sucessful.
sleep 1;
connection thread1;
begin;
--error ER_LOCK_WAIT_TIMEOUT
update t1 set tipo=1 where tipo=2;
select * from t1;
connection thread2;
reap;
select * from t1;
send commit;
connection thread1;
commit;
connection thread2;
reap;
select * from t1;
connection thread1;
select * from t1;
connection default;
drop table t1;
--echo
--echo **
--echo ** one UPDATE not changing result set and DELETE
--echo **
#connect (thread1, localhost, mysqltest,,);
connection thread1;
--echo ** Set up table
eval SET SESSION STORAGE_ENGINE = $engine_type;
create table t1(eta int(11) not null, tipo int(11), c varchar(255));
insert into t1 values (7,7, "aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa");
insert into t1 values (8,8, "bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb");
insert into t1 values (10,1,"ccccccccccccccccccccccccccccccccccccccccccc");
insert into t1 values (20,2,"ddddddddddddddddddddddddddddddddddddddddddd");
insert into t1 values (30,1,"eeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee");
insert into t1 values (40,2,"fffffffffffffffffffffffffffffffffffffffffff");
insert into t1 values (50,1,"ggggggggggggggggggggggggggggggggggggggggggg");
insert into t1 values (60,2,"hhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhh");
insert into t1 values (70,1,"iiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiii");
insert into t1 values (80,22,"jjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjj");
insert into t1 values (90,11,"kkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkk");
#connect (thread2, localhost, mysqltest,,);
connection thread2;
begin;
send delete from t1 where tipo=2;
# The sleep has not been replaced as all tried wait conditions leaded to sporadically
# succeding update in the following thread. Also the used status variables '%lock%' and
# 'innodb_deleted_rows' and infos in processlist where not sucessful.
sleep 1;
connection thread1;
begin;
--echo ** Update on t1 will cause a table scan which will be blocked because
--echo ** the previously initiated table scan applied exclusive key locks on
--echo ** all primary keys.
--echo ** Not so for READ UNCOMMITTED or READ COMMITTED. The locks that
--echo ** do not match the WHERE condition are released.
if ($keep_locks)
{
--error ER_LOCK_WAIT_TIMEOUT
update t1 set tipo=1 where tipo=22;
}
if (!$keep_locks)
{
update t1 set tipo=1 where tipo=22;
}
select * from t1;
connection thread2;
reap;
select * from t1;
send commit;
connection thread1;
commit;
connection thread2;
reap;
select * from t1;
connection thread1;
select * from t1;
disconnect thread1;
disconnect thread2;
connection default;
drop table t1;
drop user mysqltest@localhost;
SET SQL_MODE=default;
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