开启MySQL performance_schema后对性能的影响

原文地址

先占坑，还需要进一步测试

接上篇
使用 sysbench 对数据库进行压测，观察开启performance_schema后，对数据库性能的影响

压测计划

数据库版本为：percona mysql 5.6.35
prepar数据量：1000W
压测时长：3600S
并发：200/500/800

压测步骤

不开启performance_schema

mysql> show variables like '%performance_schema%'    -> ;+--------------------------------------------------------+-------+| Variable_name                                          | Value |+--------------------------------------------------------+-------+| performance_schema                                     | OFF   || performance_schema_accounts_size                       | -1    || performance_schema_digests_size                        | -1    || performance_schema_events_stages_history_long_size     | -1    || performance_schema_events_stages_history_size          | -1    || performance_schema_events_statements_history_long_size | -1    || performance_schema_events_statements_history_size      | -1    || performance_schema_events_waits_history_long_size      | -1    |……+--------------------------------------------------------+-------+32 rows in set (0.01 sec)

使用sysbench 对数据库进行压测

sysbench --test=./tests/db/oltp.lua --mysql-table-engine=innodb --mysql-host=192.168.3.26 --mysql-port=3312  --mysql-db=sbtest --oltp-table-size=10000000 --oltp_tables_count=3 --mysql-user=root --mysql-password=123456 preparesysbench --mysql-host=192.168.3.26 --mysql-port=3312 --mysql-user=root --mysql-password=123456 --test=./tests/db/oltp.lua --num-threads=200 --oltp-read-only=off --report-interval=10 --rand-type=uniform --max-time=3600 --max-requests=0 --percentile=99 runsysbench --test=./tests/db/oltp.lua --mysql-table-engine=innodb --mysql-host=192.168.3.26 --mysql-port=3312  --mysql-db=sbtest --oltp-table-size=10000000 --oltp_tables_count=3 --mysql-user=root --mysql-password=123456 cleanup

开启performance_schema

SELECT * FROM setup_instruments WHERE NAME LIKE 'statement/%';update  setup_instruments set ENABLED='NO',TIMED ='NO' ;update  setup_instruments set ENABLED='YES',TIMED ='YES' WHERE NAME LIKE 'statement/%';update setup_consumers  set ENABLED ='NO'; update setup_consumers set ENABLED ='YES' WHERE NAME LIKE 'events_statements_current';update setup_consumers set ENABLED ='YES' WHERE NAME LIKE 'statements_digest';update setup_consumers set ENABLED = 'YES' where name like '%instrumentation';SELECT * FROM setup_timers WHERE NAME = 'statement';

使用sysbench 对数据库进行压测

sysbench --test=./tests/db/oltp.lua --mysql-table-engine=innodb --mysql-host=192.168.3.25 --mysql-port=3312  --mysql-db=sbtest --oltp-table-size=10000000 --oltp_tables_count=3 --mysql-user=root --mysql-password=123456 preparesysbench --mysql-host=192.168.3.25 --mysql-port=3312 --mysql-user=root --mysql-password=123456 --test=./tests/db/oltp.lua --num-threads=200 --oltp-read-only=off --report-interval=10 --rand-type=uniform --max-time=3600 --max-requests=0 --percentile=99 runsysbench --test=./tests/db/oltp.lua --mysql-table-engine=innodb --mysql-host=192.168.3.25 --mysql-port=3312  --mysql-db=sbtest --oltp-table-size=10000000 --oltp_tables_count=3 --mysql-user=root --mysql-password=123456 cleanup

测试结果收集

结论

（1）开启MySQL5.6的performance_schema 性能监控功能，对数据库性能影响有限
（2）performance_schema提供了

原文地址