mysql调优参数备忘

优化参数

set profiling=1;
select version();
set global slow_query_log=1;
set global long_query_time = 1;

set global max_connections=1000;
set global innodb_buffer_pool_size = 6442450944;#   4227858432
set global wait_timeout=180;
set global interactive_timeout=180;
show full processlist;
show variables like 'log_error';
show variables like 'innodb_buffer_pool_size';
show variables like 'slow_query_log';
show variables like 'long_query_time';
show variables like '%max_connections%';
show variables like '%max_user_connections%';
show table status ;
show status like 'Thread%';
show variables like 'back_log';
show variables like 'wait_timeout';
show OPEN TABLES where In_use > 0;
show global status like 'Max_used_connections';
show global variables like 'slow_query_log_file';
show profiles;
show profile;
show variables like '%engine%';
show variables like '%pro%';
show table status from xindun19 where name='dev_securityinfo';
show global status  like '%wait%fre%';
-- information_schema.innodb_lock_waits–锁等待的对应关系
select * from information_schema.innodb_lock_waits;
#观察innodb利用率，如果Innodb_buffer_pool_wait_free值大于0，说明buffer_pool不够用；
show global status  like '%wait%fre%';

性能监控

#1. QPS(每秒Query量)
#QPS = Questions(or Queries) / seconds
#show global status like 'Question%';

#2. TPS(每秒事务量)
#TPS = (Com_commit + Com_rollback) / seconds
show global status like 'Com_commit';
show global status like 'Com_rollback';

#3. key Buffer 命中率
show global status like 'key%';
key_buffer_read_hits = (1-key_reads / key_read_requests) * 100%
key_buffer_write_hits = (1-key_writes / key_write_requests) * 100%

#4. InnoDB Buffer命中率
 show status like 'innodb_buffer_pool_read%';
innodb_buffer_read_hits = (1 - innodb_buffer_pool_reads / innodb_buffer_pool_read_requests) * 100%

#5. Query Cache命中率
 show status like 'Qcache%';
Query_cache_hits = (Qcahce_hits / (Qcache_hits + Qcache_inserts )) * 100%;

#6. Table Cache状态量
 show global status like 'open%';
#比较 open_tables 与 opend_tables 值

#7. Thread Cache 命中率
 show global status like 'Thread%';
 show global status like 'Connections';
#Thread_cache_hits = (1 - Threads_created / connections ) * 100%

#8. 锁定状态
 show global status like '%lock%';
#Table_locks_waited/Table_locks_immediate=0.3% 如果这个比值比较大的话，说明表锁造成的阻塞比较严重
#Innodb_row_lock_waits innodb行锁，太大可能是间隙锁造成的

#9. 复制延时量
show slave status
#查看延时时间

#10. Tmp Table 状况(临时表状况)
show status like 'Create_tmp%';
#Created_tmp_disk_tables/Created_tmp_tables比值最好不要超过10%，如果Created_tmp_tables值比较大，
#可能是排序句子过多或者是连接句子不够优化

#11. Binlog Cache 使用状况
show status like 'Binlog_cache%';
#如果Binlog_cache_disk_use值不为0 ，可能需要调大 binlog_cache_size大小

#12. Innodb_log_waits 量
show status like 'innodb_log_waits';
#Innodb_log_waits值不等于0的话，表明 innodb log buffer 因为空间不足而等待

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