mariadb/mysql-test/t/status.test

# embedded server causes different stat
-- source include/not_embedded.inc

# PS causes different statistics
--disable_ps_protocol

connect (con1,localhost,root,,);
connect (con2,localhost,root,,);

flush status;
show status like 'Table_lock%';
connection con1;
SET SQL_LOG_BIN=0;
--disable_warnings
drop table if exists t1;
--enable_warnings

create table t1(n int) engine=myisam;
insert into t1 values(1);
connection con2;
lock tables t1 read;
unlock tables;
lock tables t1 read;
connection con1;
--send
update t1 set n = 3;
connection con2;
sleep 1;
unlock tables;
connection con1;
reap;
show status like 'Table_lock%';
drop table t1;

disconnect con2;
disconnect con1;
connection default;

# End of 4.1 tests

#
# last_query_cost
#

select 1;
show status like 'last_query_cost';

#
# Test for Bug #15933 max_used_connections is wrong after FLUSH STATUS
# if connections are cached
#
#
# The first suggested fix from the bug report was chosen
# (see http://bugs.mysql.com/bug.php?id=15933):
#
#   a) On flushing the status, set max_used_connections to
#   threads_connected, not to 0.
#
#   b) Check if it is necessary to increment max_used_connections when
#   taking a thread from the cache as well as when creating new threads
#

# Wait for at most $disconnect_timeout seconds for disconnects to finish.
let $disconnect_timeout = 10;

# Wait for any previous disconnects to finish.
FLUSH STATUS;
--disable_query_log
--disable_result_log
eval SET @wait_left = $disconnect_timeout;
let $max_used_connections = `SHOW STATUS LIKE 'max_used_connections'`;
eval SET @max_used_connections = SUBSTRING('$max_used_connections', 21)+0;
let $wait_more = `SELECT @max_used_connections != 1 && @wait_left > 0`;
while ($wait_more)
{
  sleep 1;
  FLUSH STATUS;
  SET @wait_left = @wait_left - 1;
  let $max_used_connections = `SHOW STATUS LIKE 'max_used_connections'`;
  eval SET @max_used_connections = SUBSTRING('$max_used_connections', 21)+0;
  let $wait_more = `SELECT @max_used_connections != 1 && @wait_left > 0`;
}
--enable_query_log
--enable_result_log

# Prerequisite.
SHOW STATUS LIKE 'max_used_connections';

# Save original setting.
SET @save_thread_cache_size=@@thread_cache_size;
SET GLOBAL thread_cache_size=3;

connect (con1,localhost,root,,);
connect (con2,localhost,root,,);

connection con1;
disconnect con2;

# Check that max_used_connections still reflects maximum value.
SHOW STATUS LIKE 'max_used_connections';

# Check that after flush max_used_connections equals to current number
# of connections.  First wait for previous disconnect to finish.
FLUSH STATUS;
--disable_query_log
--disable_result_log
eval SET @wait_left = $disconnect_timeout;
let $max_used_connections = `SHOW STATUS LIKE 'max_used_connections'`;
eval SET @max_used_connections = SUBSTRING('$max_used_connections', 21)+0;
let $wait_more = `SELECT @max_used_connections != 2 && @wait_left > 0`;
while ($wait_more)
{
  sleep 1;
  FLUSH STATUS;
  SET @wait_left = @wait_left - 1;
  let $max_used_connections = `SHOW STATUS LIKE 'max_used_connections'`;
  eval SET @max_used_connections = SUBSTRING('$max_used_connections', 21)+0;
  let $wait_more = `SELECT @max_used_connections != 2 && @wait_left > 0`;
}
--enable_query_log
--enable_result_log
# Check that we don't count disconnected thread any longer.
SHOW STATUS LIKE 'max_used_connections';

# Check that max_used_connections is updated when cached thread is
# reused...
connect (con2,localhost,root,,);
SHOW STATUS LIKE 'max_used_connections';

# ...and when new thread is created.
connect (con3,localhost,root,,);
SHOW STATUS LIKE 'max_used_connections';

# Restore original setting.
connection default;
SET GLOBAL thread_cache_size=@save_thread_cache_size;

disconnect con3;
disconnect con2;
disconnect con1;


#
# Bug #30377: EXPLAIN loses last_query_cost when used with UNION
#

CREATE TABLE t1 ( a INT );
INSERT INTO t1 VALUES (1), (2);

SELECT a FROM t1 LIMIT 1;
SHOW SESSION STATUS LIKE 'Last_query_cost';

EXPLAIN SELECT a FROM t1;
SHOW SESSION STATUS LIKE 'Last_query_cost';

SELECT a FROM t1 UNION SELECT a FROM t1 ORDER BY a;
SHOW SESSION STATUS LIKE 'Last_query_cost';

EXPLAIN SELECT a FROM t1 UNION SELECT a FROM t1 ORDER BY a;
SHOW SESSION STATUS LIKE 'Last_query_cost';

SELECT a IN (SELECT a FROM t1) FROM t1 LIMIT 1;
SHOW SESSION STATUS LIKE 'Last_query_cost';

SELECT (SELECT a FROM t1 LIMIT 1) x FROM t1 LIMIT 1;
SHOW SESSION STATUS LIKE 'Last_query_cost';

SELECT * FROM t1 a, t1 b LIMIT 1;
SHOW SESSION STATUS LIKE 'Last_query_cost';

DROP TABLE t1;


# End of 5.0 tests