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        慢查询日志分析(mysql),查询日志分析mysql


        开启慢查询日志之后,慢查询sql会被存到数据库系统表mysql.slow_log或是文件中,可参考。有两个工具可以帮助我们分析输出报告,分别是mysqldumpslow和pt-query-digest.

        mysqldumpslow

        mysqldumpslow是mysql自身提供的日志分析工具,一般在mysql的bin目录下

        帮助信息

         1 $ mysqldumpslow.pl --help
         2 Usage: mysqldumpslow [ OPTS... ] [ LOGS... ]
         3 
         4 Parse and summarize the MySQL slow query log. Options are
         5 
         6   --verbose    verbose
         7   --debug      debug
         8   --help       write this text to standard output
         9 
        10   -v           verbose
        11   -d           debug
        12   -s ORDER     what to sort by (al, at, ar, c, l, r, t), 'at' is default
        13                 al: average lock time
        14                 ar: average rows sent
        15                 at: average query time
        16                  c: count
        17                  l: lock time
        18                  r: rows sent
        19                  t: query time
        20   -r           reverse the sort order (largest last instead of first)
        21   -t NUM       just show the top n queries
        22   -a           don't abstract all numbers to N and strings to 'S'
        23   -n NUM       abstract numbers with at least n digits within names
        24   -g PATTERN   grep: only consider stmts that include this string
        25   -h HOSTNAME  hostname of db server for *-slow.log filename (can be wildcard),
        26                default is '*', i.e. match all
        27   -i NAME      name of server instance (if using mysql.server startup script)
        28   -l           don't subtract lock time from total time
         1 -s, 是表示按照何种方式排序
         2     c: 访问计数
         3  
         4     l: 锁定时间
         5  
         6     r: 返回记录
         7  
         8     t: 查询时间
         9  
        10     al:平均锁定时间
        11  
        12     ar:平均返回记录数
        13  
        14     at:平均查询时间
        15  
        16 -t, 是top n的意思,即为返回前面多少条的数据;
        17 -g, 后边可以写一个正则匹配模式,大小写不敏感的;
        18  
        19 比如:
        20 得到返回记录集最多的10个SQL。
        21 mysqldumpslow -s r -t 10 /database/mysql/mysql06_slow.log
        22  
        23 得到访问次数最多的10个SQL
        24 mysqldumpslow -s c -t 10 /database/mysql/mysql06_slow.log
        25  
        26 得到按照时间排序的前10条里面含有左连接的查询语句。
        27 mysqldumpslow -s t -t 10 -g “left join” /database/mysql/mysql06_slow.log
        28  
        29 另外建议在使用这些命令时结合 | 和more 使用 ,否则有可能出现刷屏的情况。
        30 mysqldumpslow -s r -t 20 /mysqldata/mysql/mysql06-slow.log | more

        如果不能执行,可以先安装perl,然后通过perl mysqldumpslow xxx.log

         

        pt-query-digest 参考

        个人觉的pt-query-digest分析报告比mysqldumpslow好用。pt-query-digest可以不仅可以分析slowlog,还可以分析binlog,generallog等。

        下载安装 https://www.percona.com/downloads/percona-toolkit/LATEST/

        在windows下,下载tar.gz包,解压之后,使用perl命令运行

         

        帮助信息

        $ perl 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 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
          --[no]continue-on-error      Continue parsing even if there is an error (
                                       default yes)
          --[no]create-history-table   Create the --history table if it does not exist (
                                       default yes)
          --[no]create-review-table    Create the --review table if it does not exist (
                                       default yes)
          --daemonize                  Fork to the background and detach from the shell
          --database=s             -D  Connect to this database
          --defaults-file=s        -F  Only read mysql options from the given file
          --embedded-attributes=a      Two Perl regex patterns to capture pseudo-
                                       attributes embedded in queries
          --expected-range=a           Explain items when there are more or fewer than
                                       expected (default 5,10)
          --explain=d                  Run EXPLAIN for the sample query with this DSN
                                       and print results
          --filter=s                   Discard events for which this Perl code doesn't
                                       return true
          --group-by=A                 Which attribute of the events to group by (
                                       default fingerprint)
          --help                       Show help and exit
          --history=d                  Save metrics for each query class in the given
                                       table. pt-query-digest saves query metrics (
                                       query time, lock time, etc.) to this table so
                                       you can see how query classes change over time
          --host=s                 -h  Connect to host
          --ignore-attributes=a        Do not aggregate these attributes (default arg,
                                       cmd, insert_id, ip, port, Thread_id, timestamp,
                                       exptime, flags, key, res, val, server_id,
                                       offset, end_log_pos, Xid)
          --inherit-attributes=a       If missing, inherit these attributes from the
                                       last event that had them (default db,ts)
          --interval=f                 How frequently to poll the processlist, in
                                       seconds (default .1)
          --iterations=i               How many times to iterate through the collect-
                                       and-report cycle (default 1)
          --limit=A                    Limit output to the given percentage or count (
                                       default 95%:20)
          --log=s                      Print all output to this file when daemonized
          --order-by=A                 Sort events by this attribute and aggregate
                                       function (default Query_time:sum)
          --outliers=a                 Report outliers by attribute:percentile:count (
                                       default Query_time:1:10)
          --output=s                   How to format and print the query analysis
                                       results (default report)
          --password=s             -p  Password to use when connecting
          --pid=s                      Create the given PID file
          --port=i                 -P  Port number to use for connection
          --preserve-embedded-numbers  Preserve numbers in database/table names when
                                       fingerprinting queries
          --processlist=d              Poll this DSN's processlist for queries, with --
                                       interval sleep between
          --progress=a                 Print progress reports to STDERR (default time,
                                       30)
          --read-timeout=m             Wait this long for an event from the input; 0 to
                                       wait forever (default 0).  Optional suffix s=
                                       seconds, m=minutes, h=hours, d=days; if no
                                       suffix, s is used.
          --[no]report                 Print query analysis reports for each --group-by
                                       attribute (default yes)
          --report-all                 Report all queries, even ones that have been
                                       reviewed
          --report-format=A            Print these sections of the query analysis
                                       report (default rusage,date,hostname,files,
                                       header,profile,query_report,prepared)
          --report-histogram=s         Chart the distribution of this attribute's
                                       values (default Query_time)
          --resume=s                   If specified, the tool writes the last file
                                       offset, if there is one, to the given filename
          --review=d                   Save query classes for later review, and don't
                                       report already reviewed classes
          --run-time=m                 How long to run for each --iterations.  Optional
                                       suffix s=seconds, m=minutes, h=hours, d=days; if
                                       no suffix, s is used.
          --run-time-mode=s            Set what the value of --run-time operates on (
                                       default clock)
          --sample=i                   Filter out all but the first N occurrences of
                                       each query
          --set-vars=A                 Set the MySQL variables in this comma-separated
                                       list of variable=value pairs
          --show-all=H                 Show all values for these attributes
          --since=s                    Parse only queries newer than this value (parse
                                       queries since this date)
          --slave-password=s           Sets the password to be used to connect to the
                                       slaves
          --slave-user=s               Sets the user to be used to connect to the slaves
          --socket=s               -S  Socket file to use for connection
          --timeline                   Show a timeline of events
          --type=A                     The type of input to parse (default slowlog)
          --until=s                    Parse only queries older than this value (parse
                                       queries until this date)
          --user=s                 -u  User for login if not current user
          --variations=A               Report the number of variations in these
                                       attributes' values
          --version                    Show version and exit
          --[no]version-check          Check for the latest version of Percona Toolkit,
                                       MySQL, and other programs (default yes)
          --[no]vertical-format        Output a trailing "\G" in the reported SQL
                                       queries (default yes)
          --watch-server=s             This option tells pt-query-digest which server
                                       IP address and port (like "10.0.0.1:3306") to
                                       watch when parsing tcpdump (for --type tcpdump);
                                       all other servers are ignored
        
        Option types: s=string, i=integer, f=float, h/H/a/A=comma-separated list, d=DSN, z=size, m=time
        
        Rules:
        
          This tool accepts additional command-line arguments. Refer to the SYNOPSIS and usage information for details.
        
        DSN syntax is key=value[,key=value...]  Allowable DSN keys:
        
          KEY  COPY  MEANING
          ===  ====  =============================================
          A    yes   Default character set
          D    yes   Default database to use when connecting to MySQL
          F    yes   Only read default options from the given file
          P    yes   Port number to use for connection
          S    yes   Socket file to use for connection
          h    yes   Connect to host
          p    yes   Password to use when connecting
          t    no    The --review or --history table
          u    yes   User for login if not current user
        
          If the DSN is a bareword, the word is treated as the 'h' key.
        
        Options and values after processing arguments:
        
          --ask-pass                   FALSE
          --attribute-aliases          db|Schema
          --attribute-value-limit      0
          --charset                    (No value)
          --config                     /etc/percona-toolkit/percona-toolkit.conf,/etc/percona-toolkit/pt-query-digest.conf,/c/Users/Admin/.percona-toolkit.conf,/c/Users/Admin/.pt-query-digest.conf
          --continue-on-error          TRUE
          --create-history-table       TRUE
          --create-review-table        TRUE
          --daemonize                  FALSE
          --database                   (No value)
          --defaults-file              (No value)
          --embedded-attributes        (No value)
          --expected-range             5,10
          --explain                    (No value)
          --filter                     (No value)
          --group-by                   fingerprint
          --help                       TRUE
          --history                    (No value)
          --host                       (No value)
          --ignore-attributes          arg,cmd,insert_id,ip,port,Thread_id,timestamp,exptime,flags,key,res,val,server_id,offset,end_log_pos,Xid
          --inherit-attributes         db,ts
          --interval                   .1
          --iterations                 1
          --limit                      95%:20
          --log                        (No value)
          --order-by                   Query_time:sum
          --outliers                   Query_time:1:10
          --output                     report
          --password                   (No value)
          --pid                        (No value)
          --port                       (No value)
          --preserve-embedded-numbers  FALSE
          --processlist                (No value)
          --progress                   time,30
          --read-timeout               0
          --report                     TRUE
          --report-all                 FALSE
          --report-format              rusage,date,hostname,files,header,profile,query_report,prepared
          --report-histogram           Query_time
          --resume                     (No value)
          --review                     (No value)
          --run-time                   (No value)
          --run-time-mode              clock
          --sample                     (No value)
          --set-vars
          --show-all
          --since                      (No value)
          --slave-password             (No value)
          --slave-user                 (No value)
          --socket                     (No value)
          --timeline                   FALSE
          --type                       slowlog
          --until                      (No value)
          --user                       (No value)
          --variations
          --version                    FALSE
          --version-check              TRUE
          --vertical-format            TRUE
          --watch-server               (No value)
        View Code
        pt-query-digest [OPTIONS] [FILES] [DSN]
        --create-review-table  当使用--review参数把分析结果输出到表中时,如果没有表就自动创建。
        --create-history-table  当使用--history参数把分析结果输出到表中时,如果没有表就自动创建。
        --filter  对输入的慢查询按指定的字符串进行匹配过滤后再进行分析
        --limit    限制输出结果百分比或数量,默认值是20,即将最慢的20条语句输出,如果是50%则按总响应时间占比从大到小排序,输出到总和达到50%位置截止。
        --host  mysql服务器地址
        --user  mysql用户名
        --password  mysql用户密码
        --history 将分析结果保存到表中,分析结果比较详细,下次再使用--history时,如果存在相同的语句,且查询所在的时间区间和历史表中的不同,则会记录到数据表中,可以通过查询同一CHECKSUM来比较某类型查询的历史变化。
        --review 将分析结果保存到表中,这个分析只是对查询条件进行参数化,一个类型的查询一条记录,比较简单。当下次使用--review时,如果存在相同的语句分析,就不会记录到数据表中。
        --output 分析结果输出类型,值可以是report(标准分析报告)、slowlog(Mysql slow log)、json、json-anon,一般使用report,以便于阅读。
        --since 从什么时间开始分析,值为字符串,可以是指定的某个”yyyy-mm-dd [hh:mm:ss]”格式的时间点,也可以是简单的一个时间值:s(秒)、h(小时)、m(分钟)、d(天),如12h就表示从12小时前开始统计。
        --until 截止时间,配合—since可以分析一段时间内的慢查询。

        输出结果分析

        分为三部分

        第一部分 总体统计结果

        overall:总共统计结果

        time range:查询执行的时间范围

        unique:唯一查询数量,即对查询条件进行参数化以后,总共有多少个不同的查询

        total:总计

        min:最小

        max:最大

        avg:平均

        95%:把所有值从小到大排列,位置位于95%的那个数,这个数一般最具参考价值

        median:中位数,把所有值从小到大排列,位置位于中间那个数

        # 该工具执行日志分析的用户时间,系统时间,物理内存占用大小,虚拟内存占用大小
        # 343ms user time, 78ms system time, 0 rss, 0 vsz
        # 工具执行时间
        # Current date: Thu Mar 29 15:51:38 2018
        # 运行分析工具的主机名
        # Hostname: NB2015041602
        # 被分析的文件名
        # Files: /d/xampp/mysql/data/NB2015041602-slow.log
        # 语句总数量,唯一的语句数量,QPS,并发数
        # Overall: 5 total, 3 unique, 0.00 QPS, 0.05x concurrency ________________
        # 日志记录的时间范围
        # Time range: 2018-03-28 14:02:06 to 14:22:10
        # 属性               总计      最小    最大    平均    95%  标准    中等
        # Attribute          total     min     max     avg     95%  stddev  median
        # ============     ======= ======= ======= ======= ======= ======= =======
        # 语句执行时间
        # Exec time            60s     10s     17s     12s     17s      3s     11s
        # 锁占用时间
        # Lock time            1ms       0   500us   200us   490us   240us       0
        # 发送到客户端的行数
        # Rows sent             50      10      10      10      10       0      10
        # select语句扫描行数
        # Rows examine     629.99k  45.43k 146.14k 126.00k 143.37k  39.57k 143.37k
        # 查询的字符数
        # Query size         2.81k     235   1.36k  575.40   1.33k  445.36  234.30

        第二部分 查询分组统计结果

        rank:所有语句的排序,默认按照查询时间降序排序,通过--order-by指定

        query id:语句的id,(去掉多余空格和文本字符,计算hash值)

        response:总的响应时间

        time:该查询在本次分析中总的时间占比

        calls:执行次数,即本次分析总共有多少条这种类型的查询语句

        r/call:平均每次执行的响应时间

        v/m:响应时间variance-to-mean的比率

        item:查询对象

        # Profile
        # Rank Query ID           Response time Calls R/Call  V/M   Item
        # ==== ================== ============= ===== ======= ===== ==============
        #    1 0x96112A601F7BCCC0 32.9042 55.0%     3 10.9681  0.01 SELECT affiliatemerchant_list user_list
        #    2 0x70885F9703A0E38D 17.2162 28.8%     1 17.2162  0.00 SELECT normalmerchant merchant_mapping normalmerchant_addinfo merchant_search_filter affiliatemerchant_list user_list
        #    3 0x43D8527285567FC4  9.7367 16.3%     1  9.7367  0.00 SELECT affiliatemerchant_list user_list affiliatemerchant_list user_list

         

        第三部分 每一种查询的详细统计结果

        id:查询的id号,和上面的query id对应

        databases:数据库名

        users:各个用户执行的次数(占比)

        query_time_distribution:查询时间分布,长短体现区间占比

        tables:查询中设计到的表

        explain:sql语句

        # Query 1: 0.00 QPS, 0.03x concurrency, ID 0x96112A601F7BCCC0 at byte 2647
        # This item is included in the report because it matches --limit.
        # Scores: V/M = 0.01
        # Time range: 2018-03-28 14:03:31 to 14:19:54
        # Attribute    pct   total     min     max     avg     95%  stddev  median
        # ============ === ======= ======= ======= ======= ======= ======= =======
        # Count         60       3
        # Exec time     54     33s     11s     11s     11s     11s   243ms     11s
        # Lock time     50   500us       0   500us   166us   490us   231us       0
        # Rows sent     60      30      10      10      10      10       0      10
        # Rows examine  69 438.42k 146.14k 146.14k 146.14k 146.14k       0 146.14k
        # Query size    24     707     235     236  235.67  234.30       0  234.30
        # String:
        # Databases    database_base
        # Hosts        localhost
        # Users        root
        # Query_time distribution
        #   1us
        #  10us
        # 100us
        #   1ms
        #  10ms
        # 100ms
        #    1s
        #  10s+  ################################################################
        # Tables
        #    SHOW TABLE STATUS FROM `database_base` LIKE 'table_list1'\G
        #    SHOW CREATE TABLE `database_base`.`table_list1`\G
        #    SHOW TABLE STATUS FROM `database_base` LIKE 'user_list'\G
        #    SHOW CREATE TABLE `database_base`.`user_list`\G
        # EXPLAIN /*!50100 PARTITIONS*/
        select SQL_CALC_FOUND_ROWS al.*, ul.Alias as userName
                FROM table_list1 al
                LEFT JOIN user_list ul ON ul.ID = al.UserId
                 WHERE TRUE  AND (al.SupportCountrys LIKE '%%')
                
                 limit 80, 10\G

         

        pt-query-digest用法示例(未测试)

        直接分析慢查询文件
        pt-query-digest  slow.log > slow_report.log
        
        分析最近12小时内的查询
        pt-query-digest  --since=12h  slow.log > slow_report2.log
        
        分析指定时间范围内的查询
        pt-query-digest slow.log --since '2017-01-07 09:30:00' --until '2017-01-07 10:00:00'> > slow_report3.log
        
        分析含有select语句的慢查询
        pt-query-digest --filter '$event->{fingerprint} =~ m/^select/i' slow.log> slow_report4.log
        
        针对某个用户的慢查询
        pt-query-digest --filter '($event->{user} || "") =~ m/^root/i' slow.log> slow_report5.log
        
        查询所有全表扫描或full join的慢查询
        pt-query-digest --filter '(($event->{Full_scan} || "") eq "yes") ||(($event->{Full_join} || "") eq "yes")' slow.log> slow_report6.log
        
        把查询保存到query_review表
        pt-query-digest --user=root –password=abc123 --review  h=localhost,D=test,t=query_review--create-review-table  slow.log
        
        把查询保存到query_history表
        pt-query-digest  --user=root –password=abc123 --review  h=localhost,D=test,t=query_history--create-review-table  slow.log_0001
        pt-query-digest  --user=root –password=abc123 --review  h=localhost,D=test,t=query_history--create-review-table  slow.log_0002
        
        通过tcpdump抓取的tcp协议数据,然后分析
        tcpdump -s 65535 -x -nn -q -tttt -i any -c 1000 port 3306 > mysql.tcp.txt
        pt-query-digest --type tcpdump mysql.tcp.txt> slow_report9.log
        
        分析biglog
        mysqlbinlog mysql-bin.000093 > mysql-bin000093.sql
        pt-query-digest  --type=binlog  mysql-bin000093.sql > slow_report10.log
        
        分析general log
        pt-query-digest  --type=genlog  localhost.log > slow_report11.log

         

        北京赛车pk10历史记录 www.zwahn.comtrue//www.zwahn.com/Mysql/1316263.htmlTechArticle慢查询日志分析(mysql),查询日志分析mysql 开启慢查询日志之后,慢查询sql会被存到数据库系统表mysql.slow_log或是文件中,可参考。有两个...

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