path: root/mysql-test/t/status.test

# This test requires that --log-output includes 'table', and the general
# log is on

# 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;

# Logging to the general query log table (--log-output=table --log) increments
# Table_locks_immediate with each query, so here Immediate becomes 1
show status like 'Table_lock%';
# ++Immediate = 2
select * from information_schema.session_status where variable_name like 'Table_lock%';

connection con1;
# ++Immediate = 3
SET SQL_LOG_BIN=0;
--disable_warnings
# ++Immediate = 4
drop table if exists t1;
--enable_warnings

# ++Immediate = 5
create table t1(n int) engine=myisam;
# Immediate + 2 = 7
insert into t1 values(1);

connection con2;
# Immediate + 2 = 9
lock tables t1 read;
# ++Immediate = 10
unlock tables;
# Immediate + 2 = 12
lock tables t1 read;

connection con1;
# ++Immediate = 13
let $ID= `select connection_id()`;
# ++Immediate = 14 (Not +2, because this increments Table_locks_waited)
--send
update t1 set n = 3;

connection con2;
# wait for the other query to start executing
let $wait_condition= select 1 from INFORMATION_SCHEMA.PROCESSLIST where ID = $ID and STATE = "Locked";
# Immediate = 14 + $wait_condition_reps ($wait_timeout is 0, so no extra select
# is done inside wait_condition.inc)
--source include/wait_condition.inc
# ++Immediate = 15 + $wait_condition_reps
unlock tables;

connection con1;
reap;
# ++Immediate = 16 + $wait_condition_reps
show status like 'Table_locks_waited';
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';
create table t1 (a int);
insert into t1 values (1),(2),(3),(4),(5),(6),(7),(8),(9),(10);
insert into t1 values (1),(2),(3),(4),(5),(6),(7),(8),(9),(10);
insert into t1 values (1),(2),(3),(4),(5),(6),(7),(8),(9),(10);
insert into t1 values (1),(2),(3),(4),(5),(6),(7),(8),(9),(10);
insert into t1 values (1),(2),(3),(4),(5),(6),(7),(8),(9),(10);
select * from t1 where a=6;
show status like 'last_query_cost';
# Ensure value dosn't change by second status call
show status like 'last_query_cost';
select 1;
show status like 'last_query_cost';
drop table t1;

#
# 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';
SELECT * FROM INFORMATION_SCHEMA.SESSION_STATUS WHERE VARIABLE_NAME 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';
SELECT * FROM INFORMATION_SCHEMA.SESSION_STATUS WHERE VARIABLE_NAME 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';
SELECT * FROM INFORMATION_SCHEMA.SESSION_STATUS WHERE VARIABLE_NAME 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';
SELECT * FROM INFORMATION_SCHEMA.SESSION_STATUS WHERE VARIABLE_NAME LIKE 'max_used_connections';

# ...and when new thread is created.
connect (con3,localhost,root,,);
SHOW STATUS LIKE 'max_used_connections';
SELECT * FROM INFORMATION_SCHEMA.SESSION_STATUS WHERE VARIABLE_NAME 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

#
# Ensure that SHOW STATUS only changes global status variables
#

connect (con1,localhost,root,,);
let $rnd_next = `show global status like 'handler_read_rnd_next'`;
let $tmp_table = `show global status like 'Created_tmp_tables'`;
show status like 'com_show_status';
show status like 'hand%write%';
show status like '%tmp%';
show status like 'hand%write%';
show status like '%tmp%';
show status like 'com_show_status';
let $rnd_next2 = `show global status like 'handler_read_rnd_next'`;
let $tmp_table2 = `show global status like 'Created_tmp_tables'`;
--disable_query_log
eval select substring_index('$rnd_next2',0x9,-1)-substring_index('$rnd_next',0x9,-1) as rnd_diff, substring_index('$tmp_table2',0x9,-1)-substring_index('$tmp_table',0x9,-1) as tmp_table_diff;
--enable_query_log

# End of 5.1 tests