mysql运维利器perconatoolkit工具的ptquerydigest语法以及用法
发布时间：2022-01-13 13:43:13 所属栏目：编程 来源：互联网
导读：mysql运维利器percona-toolkit工具的pt-query-digest语法以及用法，很多新手对此不是很清楚，为了帮助大家解决这个难题，下面小编将为大家详细讲解，有这方面需求的人可以来学习下，希望你能有所收获。 前提条件 mysql版本5.7.21 redhat 6.8 开启慢查询 mysq
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mysql运维利器percona-toolkit工具的pt-query-digest语法以及用法，很多新手对此不是很清楚，为了帮助大家解决这个难题，下面小编将为大家详细讲解，有这方面需求的人可以来学习下，希望你能有所收获。 前提条件 mysql版本5.7.21 redhat 6.8 开启慢查询 mysql运维利器percona-toolkit工具的pt-query-digest语法以及用法 启用慢查询 mysql> set global slow_query_log=on; Query OK, 0 rows affected (0.01 sec) 启用未使用索引慢查询 mysql> set global log_queries_not_using_indexes=on; Query OK, 0 rows affected (0.00 sec) 运行sql 创建测试表 mysql> use zxydb; Reading table information for completion of table and column names You can turn off this feature to get a quicker startup with -A Database changed mysql> insert into t_slow select * from t_slow; Query OK, 8388608 rows affected (35.04 sec) Records: 8388608 Duplicates: 0 Warnings: 0 执行sql查询 mysql> select count(*) from zxydb.t_slow; +----------+ | count(*) | +----------+ | 16777216 | +----------+ 1 row in set (6.48 sec) pt-query-digest语法 查询pt-query-digest选项 [root@three57 percona-toolkit-3.1.0]# pt-query-digest --help pt-query-digest analyzes MySQL queries from slow, general, and binary log files. It can also analyze queries from C<SHOW PROCESSLIST> and MySQL protocol data from tcpdump. By default, queries are grouped by fingerprint and reported in descending order of query time (i.e. the slowest queries first). If no C<FILES> are given, the tool reads C<STDIN>. The optional C<DSN> is used for certain options like L<"--since"> and L<"--until">. For more details, please use the --help option, or try 'perldoc /usr/local/bin/pt-query-digest' for complete documentation. Usage: pt-query-digest [OPTIONS] [FILES] [DSN] Options: --ask-pass Prompt for a password when connecting to MySQL --attribute-aliases=a List of attribute|alias,etc (default db|Schema) --attribute-value-limit=i A sanity limit for attribute values (default 0) --charset=s -A Default character set --config=A Read this comma-separated list of config files; if specified, this must be the first option on the command line 获取完整pt-query-digest全部语义信息 [root@three57 percona-toolkit-3.1.0]# man pt-query-digest>/pt-query.log 使用pt-query-digest分析慢查询日志 [root@three57 percona-toolkit-3.1.0]# pt-query-digest /var/lib/mysql/three57-slow.log 用户时间分布及进程内程内存 # 100ms user time, 10ms system time, 21.88M rss, 173.04M vsz 当前系统时间 # Current date: Wed Nov 13 15:29:44 2019 主机名称 # Hostname: three57 慢查询日志 # Files: /var/lib/mysql/three57-slow.log QPS及并发 # Overall: 1 total, 1 unique, 0 QPS, 0x concurrency ______________________ # Time range: all events occurred at 2019-11-13T07:28:59 属性：全部，最小，最大，平均，95%，平均利差，中差 # Attribute total min max avg 95% stddev median # ============ ======= ======= ======= ======= ======= ======= ======= SQL执行时间 # Exec time 7s 7s 7s 7s 7s 0 7s 锁定时间 # Lock time 127us 127us 127us 127us 127us 0 127us SQL产生结果个数 # Rows sent 1 1 1 1 1 0 1 SQL扫描表记录 # Rows examine 16.00M 16.00M 16.00M 16.00M 16.00M 0 16.00M 查询大小 # Query size 33 33 33 33 33 0 33 符合慢查询SQL的概述，极重要，排版一个字，棒 # Profile RANK为排名编号 query id为具体SQL response time为sql响应时间 calls为SQL执行次数 r/call为每次SQL执行的响应时间，具体的SQL语句 # Rank Query ID Response time Calls R/Call V/M # ==== ================================== ============= ===== ====== ===== # 1 0xAC104A376C0A55B1F56FDA6E706E555F 6.7433 100.0% 1 6.7433 0.00 SELECT zxydb.t_slow 具体慢查询SQL语句 # Query 1: 0 QPS, 0x concurrency, ID 0xAC104A376C0A55B1F56FDA6E706E555F at byte 0 # This item is included in the report because it matches --limit. # Scores: V/M = 0.00 # Time range: all events occurred at 2019-11-13T07:28:59 # Attribute pct total min max avg 95% stddev median # ============ === ======= ======= ======= ======= ======= ======= ======= # Count 100 1 SQL执行时间为7s # Exec time 100 7s 7s 7s 7s 7s 0 7s SQL锁定时间为127us,此值如极高，需要针对性分析 # Lock time 100 127us 127us 127us 127us 127us 0 127us # Rows sent 100 1 1 1 1 1 0 1 全表扫描相关 # Rows examine 100 16.00M 16.00M 16.00M 16.00M 16.00M 0 16.00M # Query size 100 33 33 33 33 33 0 33 # String: 产生SQL的主机及用户 # Hosts localhost # Users root SQL不同时间范围分布，极好极好 可见如上SQL执行时间在1S左右 # Query_time distribution # 1us # 10us # 100us # 1ms # 10ms # 100ms # 1s ################################################################ # 10s+ # Tables # SHOW TABLE STATUS FROM `zxydb` LIKE 't_slow'G # SHOW CREATE TABLE `zxydb`.`t_slow`G # EXPLAIN /*!50100 PARTITIONS*/ select count(*) from zxydb.t_slowG [root@three57 percona-toolkit-3.1.0]# 看完上述内容是否对您有帮助呢？ （编辑：财气旺网 - 海宁网） 【声明】本站内容均来自网络，其相关言论仅代表作者个人观点，不代表本站立场。若无意侵犯到您的权利，请及时与联系站长删除相关内容! |
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