苍穹性能测试-- PostgreSQL性能指标
在做苍穹性能测试或者分析数据库问题的时候可以采用以下一些内容作为衡量数据库性能的指标。
| 指标分类 | 指标项 | 值 | 获取值方法 |
| 主机 | 数据库机器cpu使用率 | <80% | top,sar 命令 |
| 数据库机器负载 | <cpu核数*0.7 | top,uptime 命令 | |
| 数据库机器磁盘IO使用率 | <80% | iostat命令 | |
| 数据库机器内存使用率 | <90% | top,free命令,/proc/meminfo | |
| 数据库机器磁盘空间 | 使用率<90% | df | |
| 数据库机器网卡流量 | <100% | iftop,sar | |
| 网络延迟 | <0.5ms | ping，hping3 | |
| 数据库 | 表大小 | 核心单表<10G | select table_catalog, tablename, pg_size_pretty(tablesize) as table_size from ( select table_catalog, ( table_schema||'.'|| table_name ) as tablename, pg_table_size( table_schema||'.'|| table_name ) as tablesize from information_schema.tables where pg_table_size( table_schema||'.'|| table_name ) > 10737418240 order by pg_table_size(table_schema||'.'|| table_name ) desc ) as all_tables ; |
| 最大连接数 | <=5000 | select count(1) from pg_stat_activity; | |
| 活跃连接数 | <=1000 | select count(1) from pg_stat_activity where state ='active'; | |
| 实时慢SQL | 不能有大量>60s | 查看后台慢日志记录 | |
| 错误日志 | 不能出现有error的日志 | 查看数据库pg_log错误日志 | |
| wal日志 | 产生wal日志<1min | 查看pg_wal目录的wal日志生成情况 | |
| 阻塞事务 | 不能出现大量阻塞SQL | with t_wait as ( select a.mode,a.locktype,a.database,a.relation,a.page,a.tuple,a.classid,a.granted, a.objid,a.objsubid,a.pid,a.virtualtransaction,a.virtualxid,a.transactionid,a.fastpath, b.state,b.query,b.xact_start,b.query_start,b.usename,b.datname,b.client_addr,b.client_port,b.application_name from pg_locks a,pg_stat_activity b where a.pid=b.pid and not a.granted ), t_run as ( select a.mode,a.locktype,a.database,a.relation,a.page,a.tuple,a.classid,a.granted, a.objid,a.objsubid,a.pid,a.virtualtransaction,a.virtualxid,a.transactionid,a.fastpath, b.state,b.query,b.xact_start,b.query_start,b.usename,b.datname,b.client_addr,b.client_port,b.application_name from pg_locks a,pg_stat_activity b where a.pid=b.pid and a.granted ), t_overlap as ( select r.* from t_wait w join t_run r on ( r.locktype is not distinct from w.locktype and r.database is not distinct from w.database and r.relation is not distinct from w.relation and r.page is not distinct from w.page and r.tuple is not distinct from w.tuple and r.virtualxid is not distinct from w.virtualxid and r.transactionid is not distinct from w.transactionid and r.classid is not distinct from w.classid and r.objid is not distinct from w.objid and r.objsubid is not distinct from w.objsubid and r.pid <> w.pid ) ), t_unionall as ( select r.* from t_overlap r union all select w.* from t_wait w ) select locktype,datname,relation::regclass,page,tuple,virtualxid,transactionid::text,classid::regclass,objid,objsubid, string_agg( 'Pid: '||case when pid is null then 'NULL' else pid::text end||chr(10)|| 'Lock_Granted: '||case when granted is null then 'NULL' else granted::text end||' , Mode: '||case when mode is null then 'NULL' else mode::text end||' , FastPath: '||case when fastpath is null then 'NULL' else fastpath::text end||' , VirtualTransaction: '||case when virtualtransaction is null then 'NULL' else virtualtransaction::text end||' , Session_State: '||case when state is null then 'NULL' else state::text end||chr(10)|| 'Username: '||case when usename is null then 'NULL' else usename::text end||' , Database: '||case when datname is null then 'NULL' else datname::text end||' , Client_Addr: '||case when client_addr is null then 'NULL' else client_addr::text end||' , Clien |
苍穹性能测试-- PostgreSQL性能指标
在做苍穹性能测试或者分析数据库问题的时候可以采用以下一些内容作为衡量数据库性能的指标。指标分类指标项值获取值方法主机数据库机器cpu...
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