mysqltuner

root@localhost:~# ./mysqltuner.pl
 >>  MySQLTuner 1.7.15 - Major Hayden <[email protected]>
 >>  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
[OK] Logged in using credentials from Debian maintenance account.
[OK] Currently running supported MySQL version 5.7.25-0ubuntu0.18.04.2-log
[OK] Operating on 64-bit architecture

-------- Log file Recommendations ------------------------------------------------------------------
[--] Log file: /var/log/mysql/error.log(476B)
[OK] Log file /var/log/mysql/error.log exists
[OK] Log file /var/log/mysql/error.log is readable.
[OK] Log file /var/log/mysql/error.log is not empty
[OK] Log file /var/log/mysql/error.log is smaller than 32 Mb
[OK] /var/log/mysql/error.log doesn't contain any warning.
[OK] /var/log/mysql/error.log doesn't contain any error.
[--] 0 start(s) detected in /var/log/mysql/error.log
[--] 0 shutdown(s) detected in /var/log/mysql/error.log

-------- Storage Engine Statistics -----------------------------------------------------------------
[--] Status: +ARCHIVE +BLACKHOLE +CSV -FEDERATED +InnoDB +MEMORY +MRG_MYISAM +MyISAM +PERFORMANCE_SCHEMA
[--] Data in InnoDB tables: 2.0G (Tables: 69)
[OK] Total fragmented tables: 0

-------- Analysis Performance Metrics --------------------------------------------------------------
[--] innodb_stats_on_metadata: OFF
[OK] No stat updates during querying INFORMATION_SCHEMA.

-------- Security Recommendations ------------------------------------------------------------------
[OK] There are no anonymous accounts for any database users
[!!] failed to execute: SELECT CONCAT(user, '@', host) FROM mysql.user WHERE (IF(plugin='mysql_native_password', authentication_string, password) = '' OR IF(plugin='mysql_native_password', authentication_string, password) IS NULL) AND plugin NOT IN ('unix_socket', 'win_socket', 'auth_pam_compat')
[!!] FAIL Execute SQL / return code: 256
[OK] All database users have passwords assigned
[--] Bug #80860 MySQL 5.7: Avoid testing password when validate_password is activated

-------- CVE Security Recommendations --------------------------------------------------------------
[--] Skipped due to --cvefile option undefined

-------- Performance Metrics -----------------------------------------------------------------------
[--] Up for: 1d 5h 58m 40s (457K q [4.243 qps], 28K conn, TX: 2G, RX: 53M)
[--] Reads / Writes: 98% / 2%
[--] Binary logging is disabled
[--] Physical Memory     : 15.7G
[--] Max MySQL memory    : 8.6G
[--] Other process memory: 0B
[--] Total buffers: 8.3G global + 1.0M per thread (256 max threads)
[--] P_S Max memory usage: 72B
[--] Galera GCache Max memory usage: 0B
[OK] Maximum reached memory usage: 8.3G (53.17% of installed RAM)
[OK] Maximum possible memory usage: 8.6G (54.73% of installed RAM)
[OK] Overall possible memory usage with other process is compatible with memory available
[OK] Slow queries: 0% (42/457K)
[OK] Highest usage of available connections: 2% (6/256)
[OK] Aborted connections: 0.01%  (3/28889)
[!!] Query cache may be disabled by default due to mutex contention.
[!!] Query cache efficiency: 0.0% (0 cached / 310K selects)
[OK] Query cache prunes per day: 0
[!!] Sorts requiring temporary tables: 19% (15K temp sorts / 80K sorts)
[OK] No joins without indexes
[!!] Temporary tables created on disk: 54% (30K on disk / 56K total)
[OK] Thread cache hit rate: 99% (6 created / 28K connections)
[OK] Table cache hit rate: 70% (1K open / 1K opened)
[OK] Open file limit used: 1% (68/5K)
[OK] Table locks acquired immediately: 100% (511 immediate / 511 locks)

-------- Performance schema ------------------------------------------------------------------------
[--] Memory used by P_S: 72B
[--] Sys schema is installed.

-------- ThreadPool Metrics ------------------------------------------------------------------------
[--] ThreadPool stat is disabled.

-------- MyISAM Metrics ----------------------------------------------------------------------------
[!!] Key buffer used: 18.4% (1M used / 8M cache)
[OK] Key buffer size / total MyISAM indexes: 8.0M/43.0K
[OK] Read Key buffer hit rate: 97.3% (366 cached / 10 reads)
[OK] Write Key buffer hit rate: 100.0% (5 cached / 5 writes)

-------- InnoDB Metrics ----------------------------------------------------------------------------
[--] InnoDB is enabled.
[--] InnoDB Thread Concurrency: 0
[OK] InnoDB File per table is activated
[OK] InnoDB buffer pool / data size: 8.0G/2.0G
[OK] Ratio InnoDB log file size / InnoDB Buffer pool size: 1.0G * 2/8.0G should be equal to 25%
[!!] InnoDB buffer pool instances: 4
[--] Number of InnoDB Buffer Pool Chunk : 64 for 4 Buffer Pool Instance(s)
[OK] Innodb_buffer_pool_size aligned with Innodb_buffer_pool_chunk_size & Innodb_buffer_pool_instances
[OK] InnoDB Read buffer efficiency: 99.99% (521895373 hits/ 521966251 total)
[!!] InnoDB Write Log efficiency: 86.39% (39770 hits/ 46036 total)
[OK] InnoDB log waits: 0.00% (0 waits / 6266 writes)

-------- AriaDB Metrics ----------------------------------------------------------------------------
[--] AriaDB is disabled.

-------- 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: ROW
[--] XA support enabled: ON
[--] Semi synchronous replication Master: Not Activated
[--] Semi synchronous replication Slave: Not Activated
[--] This is a standalone server

-------- Recommendations ---------------------------------------------------------------------------
General recommendations:
    Temporary table size is already large - reduce result set size
    Reduce your SELECT DISTINCT queries without LIMIT clauses
Variables to adjust:
    query_cache_size (=0)
    query_cache_type (=0)
    query_cache_limit (> 1M, or use smaller result sets)
    sort_buffer_size (> 256K)
    read_rnd_buffer_size (> 256K)
    innodb_buffer_pool_instances(=8)