mirror of
https://github.com/MariaDB/server.git
synced 2025-01-19 05:22:25 +01:00
118 lines
3.4 KiB
Text
118 lines
3.4 KiB
Text
flush status;
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show status like 'Table_lock%';
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Variable_name Value
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Table_locks_immediate 0
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Table_locks_waited 0
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select * from information_schema.session_status where variable_name like 'Table_lock%';
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VARIABLE_NAME VARIABLE_VALUE
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TABLE_LOCKS_IMMEDIATE 0.0000000
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TABLE_LOCKS_WAITED 0.0000000
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SET SQL_LOG_BIN=0;
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drop table if exists t1;
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create table t1(n int) engine=myisam;
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insert into t1 values(1);
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lock tables t1 read;
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unlock tables;
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lock tables t1 read;
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update t1 set n = 3;
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unlock tables;
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show status like 'Table_lock%';
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Variable_name Value
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Table_locks_immediate 3
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Table_locks_waited 1
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select * from information_schema.session_status where variable_name like 'Table_lock%';
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VARIABLE_NAME VARIABLE_VALUE
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TABLE_LOCKS_IMMEDIATE 3.0000000
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TABLE_LOCKS_WAITED 1.0000000
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drop table t1;
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select 1;
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1
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1
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show status like 'last_query_cost';
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Variable_name Value
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Last_query_cost 0.000000
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create table t1 (a int);
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insert into t1 values (1),(2),(3),(4),(5),(6),(7),(8),(9),(10);
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insert into t1 values (1),(2),(3),(4),(5),(6),(7),(8),(9),(10);
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insert into t1 values (1),(2),(3),(4),(5),(6),(7),(8),(9),(10);
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insert into t1 values (1),(2),(3),(4),(5),(6),(7),(8),(9),(10);
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insert into t1 values (1),(2),(3),(4),(5),(6),(7),(8),(9),(10);
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select * from t1 where a=6;
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a
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6
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6
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6
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6
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6
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show status like 'last_query_cost';
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Variable_name Value
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Last_query_cost 12.084449
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show status like 'last_query_cost';
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Variable_name Value
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Last_query_cost 12.084449
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select 1;
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1
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1
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show status like 'last_query_cost';
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Variable_name Value
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Last_query_cost 0.000000
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drop table t1;
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FLUSH STATUS;
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SHOW STATUS LIKE 'max_used_connections';
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Variable_name Value
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Max_used_connections 1
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SELECT * FROM INFORMATION_SCHEMA.SESSION_STATUS WHERE VARIABLE_NAME LIKE 'max_used_connections';
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VARIABLE_NAME VARIABLE_VALUE
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MAX_USED_CONNECTIONS 1.0000000
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SET @save_thread_cache_size=@@thread_cache_size;
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SET GLOBAL thread_cache_size=3;
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SHOW STATUS LIKE 'max_used_connections';
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Variable_name Value
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Max_used_connections 3
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SELECT * FROM INFORMATION_SCHEMA.SESSION_STATUS WHERE VARIABLE_NAME LIKE 'max_used_connections';
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VARIABLE_NAME VARIABLE_VALUE
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MAX_USED_CONNECTIONS 3.0000000
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FLUSH STATUS;
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SHOW STATUS LIKE 'max_used_connections';
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Variable_name Value
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Max_used_connections 2
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SELECT * FROM INFORMATION_SCHEMA.SESSION_STATUS WHERE VARIABLE_NAME LIKE 'max_used_connections';
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VARIABLE_NAME VARIABLE_VALUE
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MAX_USED_CONNECTIONS 2.0000000
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SHOW STATUS LIKE 'max_used_connections';
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Variable_name Value
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Max_used_connections 3
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SELECT * FROM INFORMATION_SCHEMA.SESSION_STATUS WHERE VARIABLE_NAME LIKE 'max_used_connections';
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VARIABLE_NAME VARIABLE_VALUE
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MAX_USED_CONNECTIONS 3.0000000
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SHOW STATUS LIKE 'max_used_connections';
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Variable_name Value
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Max_used_connections 4
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SELECT * FROM INFORMATION_SCHEMA.SESSION_STATUS WHERE VARIABLE_NAME LIKE 'max_used_connections';
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VARIABLE_NAME VARIABLE_VALUE
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MAX_USED_CONNECTIONS 4.0000000
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SET GLOBAL thread_cache_size=@save_thread_cache_size;
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show status like 'com_show_status';
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Variable_name Value
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Com_show_status 3
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show status like 'hand%write%';
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Variable_name Value
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Handler_write 0
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show status like '%tmp%';
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Variable_name Value
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Created_tmp_disk_tables 0
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Created_tmp_files 0
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Created_tmp_tables 0
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show status like 'hand%write%';
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Variable_name Value
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Handler_write 0
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show status like '%tmp%';
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Variable_name Value
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Created_tmp_disk_tables 0
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Created_tmp_files 0
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Created_tmp_tables 0
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show status like 'com_show_status';
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Variable_name Value
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Com_show_status 8
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rnd_diff tmp_table_diff
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20 8
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