Created
January 3, 2023 13:27
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Show MySQL 8.0.x used memory
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CREATE DEFINER=`valtoni`@`%` PROCEDURE `get_memory`() | |
BEGIN | |
DECLARE var VARCHAR(64); | |
DECLARE val VARCHAR(1024); | |
DECLARE done INT; | |
#Variables for storing calculations | |
DECLARE GLOBAL_SUM DOUBLE; | |
DECLARE PER_THREAD_SUM DOUBLE; | |
DECLARE MAX_CONN DOUBLE; | |
DECLARE HEAP_TABLE DOUBLE; | |
DECLARE TEMP_TABLE DOUBLE; | |
#Cursor for Global Variables | |
#### For < MySQL 5.1 | |
#### DECLARE CUR_GBLVAR CURSOR FOR SHOW GLOBAL VARIABLES; | |
#### For MySQL 5.1+ | |
#DECLARE CUR_GBLVAR CURSOR FOR SELECT * FROM information_schema.GLOBAL_VARIABLES; | |
#### Ref: http://bugs.mysql.com/bug.php?id=49758 | |
#### For MySQL 8.0.+ | |
DECLARE CUR_GBLVAR CURSOR FOR SELECT * FROM performance_schema.GLOBAL_VARIABLES; | |
#### Ref: http://bugs.mysql.com/bug.php?id=49758 | |
DECLARE CONTINUE HANDLER FOR NOT FOUND SET done=1; | |
SET GLOBAL_SUM=0; | |
SET PER_THREAD_SUM=0; | |
SET MAX_CONN=0; | |
SET HEAP_TABLE=0; | |
SET TEMP_TABLE=0; | |
OPEN CUR_GBLVAR; | |
mylp:LOOP | |
FETCH CUR_GBLVAR INTO var,val; | |
IF done=1 THEN | |
LEAVE mylp; | |
END IF; | |
IF var in ('key_buffer_size','innodb_buffer_pool_size','innodb_additional_mem_pool_size','innodb_log_buffer_size','query_cache_size') THEN | |
#Summing Up Global Memory Usage | |
SET GLOBAL_SUM=GLOBAL_SUM+val; | |
ELSEIF var in ('read_buffer_size','read_rnd_buffer_size','sort_buffer_size','join_buffer_size','thread_stack','max_allowed_packet','net_buffer_length') THEN | |
#Summing Up Per Thread Memory Variables | |
SET PER_THREAD_SUM=PER_THREAD_SUM+val; | |
ELSEIF var in ('max_connections') THEN | |
#Maximum allowed connections | |
SET MAX_CONN=val; | |
ELSEIF var in ('max_heap_table_size') THEN | |
#Size of Max Heap tables created | |
SET HEAP_TABLE=val; | |
#Size of possible Temporary Table = Maximum of tmp_table_size / max_heap_table_size. | |
ELSEIF var in ('tmp_table_size','max_heap_table_size') THEN | |
SET TEMP_TABLE=if((TEMP_TABLE>val),TEMP_TABLE,val); | |
END IF; | |
END LOOP; | |
CLOSE CUR_GBLVAR; | |
#Summerizing: | |
select "Global Buffers" as "Parameter",CONCAT(GLOBAL_SUM/(1024*1024),' M') as "Value" union | |
select "Per Thread",CONCAT(PER_THREAD_SUM/(1024*1024),' M') union | |
select "Maximum Connections",MAX_CONN union | |
select "Total Memory Usage",CONCAT((GLOBAL_SUM + (MAX_CONN * PER_THREAD_SUM))/(1024*1024),' M') union | |
select "+ Per Heap Table",CONCAT(HEAP_TABLE / (1024*1024),' M') union | |
select "+ Per Temp Table",CONCAT(TEMP_TABLE / (1024*1024),' M') ; | |
END |
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