mysql优化工具 MySQL Tuner

作者：【吴业亮】

博客：https://wuyeliang.blog.csdn.net/

MySQL Tuner是一个Perl脚本，它连接到正在运行的MySQL实例，并根据工作负载提供配置建议。理想情况下，MySQL实例应该在运行脚本之前至少运行24小时。实例运行的时间越长，MySQL Tuner给出的建议就越好。

github网址如下：

https://github.com/major/MySQLTuner-perl

代码提交还是比较活跃的，目前有4.3k个star

由于这个软件是用perl写的，所有要安装perl

# yum install perl wget -y

将MySQL Tuner下载到您的主目录。

#  wget https://raw.githubusercontent.com/major/MySQLTuner-perl/master/mysqltuner.pl

要运行它：

#  perl ./mysqltuner.pl

系统将要求您提供MySQL root用户的名称和密码。

执行结果如下：

[root@cloud ~]#  perl ./mysqltuner.pl>>  MySQLTuner 1.7.14 - Major Hayden <major@mhtx.net>>>  Bug reports, feature requests, and downloads at http://mysqltuner.com/>>  Run with '--help' for additional options and output filtering[--] Skipped version check for MySQLTuner script
Please enter your MySQL administrative login: root
Please enter your MySQL administrative password: [OK] Currently running supported MySQL version 5.5.60-MariaDB
[OK] Operating on 64-bit architecture-------- Log file Recommendations ------------------------------------------------------------------
[--] Log file: /var/log/mariadb/mariadb.log(4K)
[OK] Log file /var/log/mariadb/mariadb.log exists
[OK] Log file /var/log/mariadb/mariadb.log is readable.
[OK] Log file /var/log/mariadb/mariadb.log is not empty
[OK] Log file /var/log/mariadb/mariadb.log is smaller than 32 Mb
[!!] /var/log/mariadb/mariadb.log contains 11 warning(s).
[OK] /var/log/mariadb/mariadb.log doesn't contain any error.
[--] 2 start(s) detected in /var/log/mariadb/mariadb.log
[--] 1) 181123 17:41:15 [Note] /usr/libexec/mysqld: ready for connections.
[--] 2) 181123 17:22:43 [Note] /usr/libexec/mysqld: ready for connections.
[--] 1 shutdown(s) detected in /var/log/mariadb/mariadb.log
[--] 1) 181123 17:40:57 [Note] /usr/libexec/mysqld: Shutdown complete-------- Storage Engine Statistics -----------------------------------------------------------------
[--] Status: +ARCHIVE +Aria +BLACKHOLE +CSV +FEDERATED +InnoDB +MEMORY +MRG_MYISAM +MyISAM +PERFORMANCE_SCHEMA
[!!] InnoDB is enabled but isn't being used
[OK] Total fragmented tables: 0-------- Analysis Performance Metrics --------------------------------------------------------------
[--] innodb_stats_on_metadata: ON
[!!] Stat are updated during querying INFORMATION_SCHEMA.-------- Security Recommendations ------------------------------------------------------------------
[OK] There are no anonymous accounts for any database users
[OK] All database users have passwords assigned
[!!] User 'nextcloud@%' does not specify hostname restrictions.
[!!] There is no basic password file list!-------- CVE Security Recommendations --------------------------------------------------------------
[--] Skipped due to --cvefile option undefined-------- Performance Metrics -----------------------------------------------------------------------
[--] Up for: 20d 22h 54m 0s (15 q [0.000 qps], 9 conn, TX: 38K, RX: 966B)
[--] Reads / Writes: 100% / 0%
[--] Binary logging is disabled
[--] Physical Memory     : 15.5G
[--] Max MySQL memory    : 1011.2M
[--] Other process memory: 0B
[--] Total buffers: 416.0M global + 2.8M per thread (214 max threads)
[--] P_S Max memory usage: 0B
[--] Galera GCache Max memory usage: 0B
[OK] Maximum reached memory usage: 418.8M (2.64% of installed RAM)
[OK] Maximum possible memory usage: 1011.2M (6.37% of installed RAM)
[OK] Overall possible memory usage with other process is compatible with memory available
[OK] Slow queries: 0% (0/15)
[OK] Highest usage of available connections: 0% (1/214)
[!!] Aborted connections: 22.22%  (2/9)
[!!] Query cache may be disabled by default due to mutex contention.
[!!] Query cache efficiency: 0.0% (0 cached / 6 selects)
[OK] Query cache prunes per day: 0
[OK] No Sort requiring temporary tables
[OK] No joins without indexes
[OK] Temporary tables created on disk: 0% (0 on disk / 4 total)
[!!] Thread cache is disabled
[OK] Table cache hit rate: 100% (26 open / 0 opened)
[OK] Open file limit used: 2% (21/1K)
[OK] Table locks acquired immediately: 100% (36 immediate / 36 locks)-------- Performance schema ------------------------------------------------------------------------
[--] Performance schema is disabled.
[--] Memory used by P_S: 0B
[--] Sys schema isn't installed.-------- ThreadPool Metrics ------------------------------------------------------------------------
[--] ThreadPool stat is enabled.
[--] Thread Pool Size: 8 thread(s).
[--] Using default value is good enough for your version (5.5.60-MariaDB)-------- MyISAM Metrics ----------------------------------------------------------------------------
[!!] Key buffer used: 18.2% (24M used / 134M cache)
[OK] Key buffer size / total MyISAM indexes: 128.0M/99.0K-------- InnoDB Metrics ----------------------------------------------------------------------------
[--] InnoDB is disabled.
[!!] InnoDB Storage engine is disabled. InnoDB is the default storage engine-------- AriaDB Metrics ----------------------------------------------------------------------------
[--] AriaDB is enabled.
[OK] Aria pagecache size / total Aria indexes: 128.0M/1B-------- TokuDB Metrics ----------------------------------------------------------------------------
[--] TokuDB is disabled.-------- XtraDB Metrics ----------------------------------------------------------------------------
[--] XtraDB is disabled.-------- Galera Metrics ----------------------------------------------------------------------------
[--] Galera is disabled.-------- Replication Metrics -----------------------------------------------------------------------
[--] Galera Synchronous replication: NO
[--] No replication slave(s) for this server.
[--] Binlog format: STATEMENT
[--] XA support enabled: ON
[--] Semi synchronous replication Master: Not Activated
[--] Semi synchronous replication Slave: Not Activated
[--] This is a standalone server-------- Recommendations ---------------------------------------------------------------------------
General recommendations:Control warning line(s) into /var/log/mariadb/mariadb.log fileAdd skip-innodb to MySQL configuration to disable InnoDBRestrict Host for user@% to user@SpecificDNSorIpEnable the slow query log to troubleshoot bad queriesReduce or eliminate unclosed connections and network issuesSet thread_cache_size to 4 as a starting value
Variables to adjust:SET innodb_stats_on_metadata = OFFquery_cache_size (=0)query_cache_type (=0)query_cache_limit (> 1M, or use smaller result sets)thread_cache_size (start at 4)

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