mysql慢日志使用mysqldumpslow进行分析

环境：centos7、mysql5.7、慢日志

1、mysqldumpslow参数解析

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mysql> show variables like '%slow_query%';  #mysql日志路径 +---------------------+--------------------------------------+ | Variable_name       | Value                                | +---------------------+--------------------------------------+ | slow_query_log      | ON                                   | | slow_query_log_file | /var/lib/mysql/1d0a52e2683d-slow.log | +---------------------+--------------------------------------+ 2 rows in set (0.01 sec) [root@minion243 tmp]# mysqldumpslow --help Usage: mysqldumpslow [ OPTS... ] [ LOGS... ]   Parse and summarize the MySQL slow query log. Options are     --verbose    verbose   --debug      debug   --help       write this text to standard output     -v           verbose   -d           debug   -s ORDER     what to sort by (al, at, ar, c, l, r, t), 'at' is default                 al: average lock time                 ar: average rows sent                 at: average query time                  c: count                  l: lock time                  r: rows sent                  t: query time    -r           reverse the sort order (largest last instead of first)   -t NUM       just show the top n queries   -a           don't abstract all numbers to N and strings to 'S'   -n NUM       abstract numbers with at least n digits within names   -g PATTERN   grep: only consider stmts that include this string   -h HOSTNAME  hostname of db server for *-slow.log filename (can be wildcard),                default is '*', i.e. match all   -i NAME      name of server instance (if using mysql.server startup script)   -l           don't subtract lock time from total time

　　

2、访问次数最多的20个sql语句

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[root@minion243 tmp]# mysqldumpslow -s c -t 20  1d0a52e2683d-slow.log   Reading mysql slow query log from 1d0a52e2683d-slow.log Count: 5021  Time=13.90s (69785s)  Lock=0.00s (1s)  Rows=0.9 (4378), rkwtest[rkwtest]@3hosts   SELECT  authentication_id,token_id,user_name,client_id,refresh_token,token,authentication  FROM oauth_access_token  WHERE (  token  like 'S' )   Count: 1487  Time=15.85s (23563s)  Lock=0.00s (0s)  Rows=0.9 (1379), 2users@4hosts   select client_id, client_secret, resource_ids, scope, authorized_grant_types, web_server_redirect_uri, authorities, access_token_validity, refresh_token_validity, additional_information, autoapprove from oauth_client_details where client_id = 'S'

3、返回记录集最多的20个sql

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[root@minion243 tmp]# mysqldumpslow -s r -t 20  1d0a52e2683d-slow.log   Reading mysql slow query log from 1d0a52e2683d-slow.log Count: 1  Time=10.61s (10s)  Lock=0.00s (0s)  Rows=21180.0 (21180), rkwtest[rkwtest]@[100.98.100.246]   SELECT u_id,alias,identity_card,phone,xh,mz,xx,csrq,sg,whcd,hyzk,university_id,university_name,nj_id,nj_name,xy_id,xy_name,zy_id,zy_name,bj_id,bj_name,create_date,create_user_id,update_date,update_user_id,university_dsdm,reserve1,reserve2,reserve3,reserve4,reserve5,profiles,status  FROM biz_student_university  WHERE  university_id = 'S' AND status = 'S'   Count: 976  Time=15.24s (14876s)  Lock=0.00s (0s)  Rows=12.0 (11730), 2users@2hosts   SELECT a.u_id AS uId, b.guide_id AS guideId, a.dept_id AS deptId, b.city_code AS cityCode, a.dept_level AS deptLevel

4、查看sql语句的执行计划

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mysql> EXPLAIN SELECT  *  FROM oauth_access_token  WHERE token  like '%282f39a1-b727-4c8a-be08-3ea924139d78%'; +----+-------------+--------------------+------------+------+---------------+------+---------+------+--------+----------+-------------+ | id | select_type | table              | partitions | type | possible_keys | key  | key_len | ref  | rows   | filtered | Extra       | +----+-------------+--------------------+------------+------+---------------+------+---------+------+--------+----------+-------------+ |  1 | SIMPLE      | oauth_access_token | NULL       | ALL  | NULL          | NULL | NULL    | NULL | 169312 |    11.11 | Using where | +----+-------------+--------------------+------------+------+---------------+------+---------+------+--------+----------+-------------+ 1 row in set, 1 warning (0.01 sec)

5、查看表的index

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mysql> show index from oauth_access_token; +--------------------+------------+--------------+--------------+-------------------+-----------+-------------+----------+--------+------+------------+---------+---------------+ | Table              | Non_unique | Key_name     | Seq_in_index | Column_name       | Collation | Cardinality | Sub_part | Packed | Null | Index_type | Comment | Index_comment | +--------------------+------------+--------------+--------------+-------------------+-----------+-------------+----------+--------+------+------------+---------+---------------+ | oauth_access_token |          0 | PRIMARY      |            1 | authentication_id | A         |      169208 |     NULL | NULL   |      | BTREE      |         |               | | oauth_access_token |          1 | idx_token_id |            1 | token_id          | A         |      169319 |     NULL | NULL   | YES  | BTREE      |         |               | +--------------------+------------+--------------+--------------+-------------------+-----------+-------------+----------+--------+------+------------+---------+---------------+ 2 rows in set (0.00 sec)