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|
set @old_concurrent_insert= @@global.concurrent_insert;
set @@global.concurrent_insert= 0;
SET @old_log_output = @@global.log_output;
SET GLOBAL LOG_OUTPUT = 'FILE';
connect con1,localhost,root,,;
connect con2,localhost,root,,;
connection default;
flush status;
show status like 'Table_lock%';
Variable_name Value
Table_locks_immediate 0
Table_locks_waited 0
select * from information_schema.session_status where variable_name like 'Table_lock%';
VARIABLE_NAME VARIABLE_VALUE
TABLE_LOCKS_IMMEDIATE 0
TABLE_LOCKS_WAITED 0
set sql_log_bin=0;
set @old_general_log = @@global.general_log;
set global general_log = 'OFF';
drop table if exists t1;
create table t1(n int) engine=myisam;
insert into t1 values(1);
select get_lock('mysqltest_lock', 100);
get_lock('mysqltest_lock', 100)
1
connection con2;
# Sending:
update t1 set n = get_lock('mysqltest_lock', 100);
connection con1;
# Wait for the first UPDATE to get blocked.
# Sending:
update t1 set n = 3;
connection default;
# wait for the second UPDATE to get blocked
select release_lock('mysqltest_lock');
release_lock('mysqltest_lock')
1
connection con2;
# Reaping first UPDATE
select release_lock('mysqltest_lock');
release_lock('mysqltest_lock')
1
connection con1;
# Reaping second UPDATE
show status like 'Table_locks_waited';
Variable_name Value
Table_locks_waited 1
connection default;
drop table t1;
set global general_log = @old_general_log;
disconnect con2;
disconnect con1;
select 1;
1
1
show status like 'last_query_cost';
Variable_name Value
Last_query_cost 0.000000
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;
a
6
6
6
6
6
show status like 'last_query_cost';
Variable_name Value
Last_query_cost 12.084449
show status like 'last_query_cost';
Variable_name Value
Last_query_cost 12.084449
select 1;
1
1
show status like 'last_query_cost';
Variable_name Value
Last_query_cost 0.000000
drop table t1;
FLUSH STATUS;
SHOW STATUS LIKE 'max_used_connections';
Variable_name Value
Max_used_connections 1
SELECT * FROM INFORMATION_SCHEMA.SESSION_STATUS WHERE VARIABLE_NAME LIKE 'max_used_connections';
VARIABLE_NAME VARIABLE_VALUE
MAX_USED_CONNECTIONS 1
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;
SHOW STATUS LIKE 'max_used_connections';
Variable_name Value
Max_used_connections 3
SELECT * FROM INFORMATION_SCHEMA.SESSION_STATUS WHERE VARIABLE_NAME LIKE 'max_used_connections';
VARIABLE_NAME VARIABLE_VALUE
MAX_USED_CONNECTIONS 3
FLUSH STATUS;
SHOW STATUS LIKE 'max_used_connections';
Variable_name Value
Max_used_connections 2
SELECT * FROM INFORMATION_SCHEMA.SESSION_STATUS WHERE VARIABLE_NAME LIKE 'max_used_connections';
VARIABLE_NAME VARIABLE_VALUE
MAX_USED_CONNECTIONS 2
connect con2,localhost,root,,;
SHOW STATUS LIKE 'max_used_connections';
Variable_name Value
Max_used_connections 3
SELECT * FROM INFORMATION_SCHEMA.SESSION_STATUS WHERE VARIABLE_NAME LIKE 'max_used_connections';
VARIABLE_NAME VARIABLE_VALUE
MAX_USED_CONNECTIONS 3
connect con3,localhost,root,,;
SHOW STATUS LIKE 'max_used_connections';
Variable_name Value
Max_used_connections 4
SELECT * FROM INFORMATION_SCHEMA.SESSION_STATUS WHERE VARIABLE_NAME LIKE 'max_used_connections';
VARIABLE_NAME VARIABLE_VALUE
MAX_USED_CONNECTIONS 4
connection default;
SET GLOBAL thread_cache_size=@save_thread_cache_size;
disconnect con3;
disconnect con2;
disconnect con1;
CREATE TABLE t1 ( a INT );
INSERT INTO t1 VALUES (1), (2);
SELECT a FROM t1 LIMIT 1;
a
1
SHOW SESSION STATUS LIKE 'Last_query_cost';
Variable_name Value
Last_query_cost 2.402418
EXPLAIN SELECT a FROM t1;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 ALL NULL NULL NULL NULL 2
SHOW SESSION STATUS LIKE 'Last_query_cost';
Variable_name Value
Last_query_cost 2.402418
SELECT a FROM t1 UNION SELECT a FROM t1 ORDER BY a;
a
1
2
SHOW SESSION STATUS LIKE 'Last_query_cost';
Variable_name Value
Last_query_cost 0.000000
EXPLAIN SELECT a FROM t1 UNION SELECT a FROM t1 ORDER BY a;
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY t1 ALL NULL NULL NULL NULL 2
2 UNION t1 ALL NULL NULL NULL NULL 2
NULL UNION RESULT <union1,2> ALL NULL NULL NULL NULL NULL Using filesort
SHOW SESSION STATUS LIKE 'Last_query_cost';
Variable_name Value
Last_query_cost 0.000000
SELECT a IN (SELECT a FROM t1) FROM t1 LIMIT 1;
a IN (SELECT a FROM t1)
1
SHOW SESSION STATUS LIKE 'Last_query_cost';
Variable_name Value
Last_query_cost 0.000000
SELECT (SELECT a FROM t1 LIMIT 1) x FROM t1 LIMIT 1;
x
1
SHOW SESSION STATUS LIKE 'Last_query_cost';
Variable_name Value
Last_query_cost 0.000000
SELECT * FROM t1 a, t1 b LIMIT 1;
a a
1 1
SHOW SESSION STATUS LIKE 'Last_query_cost';
Variable_name Value
Last_query_cost 5.205836
DROP TABLE t1;
connect con1,localhost,root,,;
show status like 'com_show_status';
Variable_name Value
Com_show_status 3
show status like 'hand%write%';
Variable_name Value
Handler_tmp_write 0
Handler_write 0
show status like '%tmp%';
Variable_name Value
Created_tmp_disk_tables 0
Created_tmp_files 0
Created_tmp_tables 0
Handler_tmp_delete 0
Handler_tmp_update 0
Handler_tmp_write 0
Rows_tmp_read 0
show status like 'hand%write%';
Variable_name Value
Handler_tmp_write 0
Handler_write 0
show status like '%tmp%';
Variable_name Value
Created_tmp_disk_tables 0
Created_tmp_files 0
Created_tmp_tables 0
Handler_tmp_delete 0
Handler_tmp_update 0
Handler_tmp_write 0
Rows_tmp_read 0
show status like 'com_show_status';
Variable_name Value
Com_show_status 8
rnd_diff tmp_table_diff
0 8
disconnect con1;
connection default;
flush status;
show status like 'Com%function';
Variable_name Value
Com_alter_function 0
Com_create_function 0
Com_drop_function 0
create function f1 (x INTEGER) returns integer
begin
declare ret integer;
set ret = x * 10;
return ret;
end //
drop function f1;
show status like 'Com%function';
Variable_name Value
Com_alter_function 0
Com_create_function 1
Com_drop_function 1
connect root, localhost, root,,test;
connection root;
create database db37908;
create table db37908.t1(f1 int);
insert into db37908.t1 values(1);
create user mysqltest_1@localhost;
grant usage,execute on test.* to mysqltest_1@localhost;
create procedure proc37908() begin select 1; end |
create function func37908() returns int sql security invoker
return (select * from db37908.t1 limit 1)|
connect user1,localhost,mysqltest_1,,test;
connection user1;
select * from db37908.t1;
ERROR 42000: SELECT command denied to user 'mysqltest_1'@'localhost' for table 't1'
show status where variable_name ='uptime' and 2 in (select * from db37908.t1);
ERROR 42000: SELECT command denied to user 'mysqltest_1'@'localhost' for table 't1'
show procedure status where name ='proc37908' and 1 in (select f1 from db37908.t1);
ERROR 42000: SELECT command denied to user 'mysqltest_1'@'localhost' for table 't1'
show function status where name ='func37908' and 1 in (select func37908());
ERROR 42000: SELECT command denied to user 'mysqltest_1'@'localhost' for table 't1'
connection default;
disconnect user1;
disconnect root;
drop database db37908;
drop procedure proc37908;
drop function func37908;
REVOKE ALL PRIVILEGES, GRANT OPTION FROM mysqltest_1@localhost;
DROP USER mysqltest_1@localhost;
connect con1,localhost,root,,;
connection con1;
DROP PROCEDURE IF EXISTS p1;
DROP FUNCTION IF EXISTS f1;
CREATE FUNCTION f1() RETURNS INTEGER
BEGIN
DECLARE foo INTEGER;
DECLARE bar INTEGER;
SET foo=1;
SET bar=2;
RETURN foo;
END $$
CREATE PROCEDURE p1()
BEGIN
SELECT 1;
END $$
SELECT f1();
f1()
1
CALL p1();
1
1
SELECT 9;
9
9
disconnect con1;
connection default;
DROP PROCEDURE p1;
DROP FUNCTION f1;
flush status;
create table t1 (a int not null auto_increment primary key, g int, b blob);
insert into t1 (g,b) values (1,'a'), (2, 'b'), (3, 'b'), (1, 'c');
select * from t1;
a g b
1 1 a
2 2 b
3 3 b
4 1 c
select b, count(*) from t1 group by b;
b count(*)
a 1
b 2
c 1
select g, count(*) from t1 group by g;
g count(*)
1 2
2 1
3 1
show status like 'Row%';
Variable_name Value
Rows_read 0
Rows_sent 10
Rows_tmp_read 0
show status like 'Handler%';
Variable_name Value
Handler_commit 0
Handler_delete 0
Handler_discover 0
Handler_external_lock 0
Handler_icp_attempts 0
Handler_icp_match 0
Handler_mrr_init 0
Handler_mrr_key_refills 0
Handler_mrr_rowid_refills 0
Handler_prepare 0
Handler_read_first 0
Handler_read_key 0
Handler_read_last 0
Handler_read_next 0
Handler_read_prev 0
Handler_read_retry 0
Handler_read_rnd 0
Handler_read_rnd_deleted 0
Handler_read_rnd_next 0
Handler_rollback 0
Handler_savepoint 0
Handler_savepoint_rollback 0
Handler_tmp_delete 0
Handler_tmp_update 0
Handler_tmp_write 0
Handler_update 0
Handler_write 0
show status like '%tmp%';
Variable_name Value
Created_tmp_disk_tables 1
Created_tmp_files 0
Created_tmp_tables 2
Handler_tmp_delete 0
Handler_tmp_update 0
Handler_tmp_write 0
Rows_tmp_read 0
drop table t1;
CREATE TABLE t1 (i int(11) DEFAULT NULL, KEY i (i) ) ENGINE=MyISAM;
insert into t1 values (1),(2),(3),(4),(5);
flush status;
select * from t1 where i=5 union select * from t1 where i=5;
i
5
show status like "handler%";
Variable_name Value
Handler_commit 0
Handler_delete 0
Handler_discover 0
Handler_external_lock 0
Handler_icp_attempts 0
Handler_icp_match 0
Handler_mrr_init 0
Handler_mrr_key_refills 0
Handler_mrr_rowid_refills 0
Handler_prepare 0
Handler_read_first 0
Handler_read_key 0
Handler_read_last 0
Handler_read_next 0
Handler_read_prev 0
Handler_read_retry 0
Handler_read_rnd 0
Handler_read_rnd_deleted 1
Handler_read_rnd_next 0
Handler_rollback 0
Handler_savepoint 0
Handler_savepoint_rollback 0
Handler_tmp_delete 0
Handler_tmp_update 0
Handler_tmp_write 0
Handler_update 0
Handler_write 0
drop table t1;
#
# MDEV-11153 - Introduce status variables for table cache monitoring and
# tuning
#
SET @old_table_open_cache= @@table_open_cache;
SET @@global.table_open_cache=10;
FLUSH TABLES;
FLUSH STATUS;
SHOW STATUS LIKE 'Table_open_cache%';
Variable_name Value
Table_open_cache_active_instances 1
Table_open_cache_hits 0
Table_open_cache_misses 0
Table_open_cache_overflows 0
SHOW STATUS LIKE 'Table_open_cache%';
Variable_name Value
Table_open_cache_active_instances 1
Table_open_cache_hits 72
Table_open_cache_misses 18
Table_open_cache_overflows 8
FLUSH TABLES;
FLUSH STATUS;
SET @@global.table_open_cache= @old_table_open_cache;
#
# MDEV-14505 - Threads_running becomes scalability bottleneck
#
# Session status for Threads_running is currently always 1.
SHOW STATUS LIKE 'Threads_running';
Variable_name Value
Threads_running 1
SELECT VARIABLE_VALUE FROM INFORMATION_SCHEMA.SESSION_STATUS WHERE VARIABLE_NAME='THREADS_RUNNING';
VARIABLE_VALUE
1
FLUSH STATUS;
SHOW STATUS LIKE 'Threads_running';
Variable_name Value
Threads_running 1
SELECT VARIABLE_VALUE FROM INFORMATION_SCHEMA.SESSION_STATUS WHERE VARIABLE_NAME='THREADS_RUNNING';
VARIABLE_VALUE
1
#
# MDEV-15915 Add Feature_json status variable.
#
SHOW STATUS LIKE 'Feature_json';
Variable_name Value
Feature_json 0
select json_valid('123');
json_valid('123')
1
SHOW STATUS LIKE 'Feature_json';
Variable_name Value
Feature_json 1
select * from json_table ('{}', '$' COLUMNS(x FOR ORDINALITY)) a;
x
1
SHOW STATUS LIKE 'Feature_json';
Variable_name Value
Feature_json 2
connection default;
set @@global.concurrent_insert= @old_concurrent_insert;
SET GLOBAL log_output = @old_log_output;
|