mariadb/mysql-test/t/status.test

# This test doesn't work with the embedded version as this code
# assumes that one query is running while we are doing queries on
# a second connection.
# This would work if mysqltest run would be threaded and handle each
# connection in a separate thread.
#
--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%';
select * from information_schema.session_status where variable_name 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 0.5;
unlock tables;
connection con1;
reap;
show status like 'Table_lock%';
select * from information_schema.session_status where variable_name 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';
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;

# 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