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December 5, 2020 06:36
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#!/bin/sh | |
# From: https://tech.labelleassiette.com/how-to-reduce-the-memory-usage-of-mysql-61ea7d1a9bd | |
# you might want to add some user authentication here | |
mysql -e "show variables; show status" | awk ' | |
{ | |
VAR[$1]=$2 | |
} | |
END { | |
MAX_CONN = VAR["max_connections"] | |
MAX_USED_CONN = VAR["Max_used_connections"] | |
BASE_MEM=VAR["key_buffer_size"] + VAR["query_cache_size"] + VAR["innodb_buffer_pool_size"] + VAR["innodb_additional_mem_pool_size"] + VAR["innodb_log_buffer_size"] | |
MEM_PER_CONN=VAR["read_buffer_size"] + VAR["read_rnd_buffer_size"] + VAR["sort_buffer_size"] + VAR["join_buffer_size"] + VAR["binlog_cache_size"] + VAR["thread_stack"] + VAR["tmp_table_size"] | |
MEM_TOTAL_MIN=BASE_MEM + MEM_PER_CONN*MAX_USED_CONN | |
MEM_TOTAL_MAX=BASE_MEM + MEM_PER_CONN*MAX_CONN | |
printf "+------------------------------------------+--------------------+\n" | |
printf "| %40s | %15.3f MB |\n", "key_buffer_size", VAR["key_buffer_size"]/1048576 | |
printf "| %40s | %15.3f MB |\n", "query_cache_size", VAR["query_cache_size"]/1048576 | |
printf "| %40s | %15.3f MB |\n", "innodb_buffer_pool_size", VAR["innodb_buffer_pool_size"]/1048576 | |
printf "| %40s | %15.3f MB |\n", "innodb_additional_mem_pool_size", VAR["innodb_additional_mem_pool_size"]/1048576 | |
printf "| %40s | %15.3f MB |\n", "innodb_log_buffer_size", VAR["innodb_log_buffer_size"]/1048576 | |
printf "+------------------------------------------+--------------------+\n" | |
printf "| %40s | %15.3f MB |\n", "BASE MEMORY", BASE_MEM/1048576 | |
printf "+------------------------------------------+--------------------+\n" | |
printf "| %40s | %15.3f MB |\n", "sort_buffer_size", VAR["sort_buffer_size"]/1048576 | |
printf "| %40s | %15.3f MB |\n", "read_buffer_size", VAR["read_buffer_size"]/1048576 | |
printf "| %40s | %15.3f MB |\n", "read_rnd_buffer_size", VAR["read_rnd_buffer_size"]/1048576 | |
printf "| %40s | %15.3f MB |\n", "join_buffer_size", VAR["join_buffer_size"]/1048576 | |
printf "| %40s | %15.3f MB |\n", "thread_stack", VAR["thread_stack"]/1048576 | |
printf "| %40s | %15.3f MB |\n", "binlog_cache_size", VAR["binlog_cache_size"]/1048576 | |
printf "| %40s | %15.3f MB |\n", "tmp_table_size", VAR["tmp_table_size"]/1048576 | |
printf "+------------------------------------------+--------------------+\n" | |
printf "| %40s | %15.3f MB |\n", "MEMORY PER CONNECTION", MEM_PER_CONN/1048576 | |
printf "+------------------------------------------+--------------------+\n" | |
printf "| %40s | %18d |\n", "max_used_connections", MAX_USED_CONN | |
printf "| %40s | %18d |\n", "max_connections", MAX_CONN | |
printf "+------------------------------------------+--------------------+\n" | |
printf "| %40s | %15.3f MB |\n", "TOTAL (MIN)", MEM_TOTAL_MIN/1048576 | |
printf "| %40s | %15.3f MB |\n", "TOTAL (MAX)", MEM_TOTAL_MAX/1048576 | |
printf "+------------------------------------------+--------------------+\n" | |
}' |
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