mysqltuner 10 july 2019

 >>  MySQLTuner 1.7.2 - 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
[OK] Logged in using credentials from debian maintenance account.
[OK] Currently running supported MySQL version 5.7.24-0ubuntu0.18.04.1
[OK] Operating on 64-bit architecture

-------- Log file Recommendations ------------------------------------------------------------------
[--] Log file: /var/log/mysql/error.log(31K)
[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.
[!!] /var/log/mysql/error.log contains 116 error(s).
[--] 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: 5G (Tables: 2603)
[OK] Total fragmented tables: 0

-------- Security Recommendations ------------------------------------------------------------------
[OK] There are no anonymous accounts for any database users
[!!] User 'root@localhost' has no password set.
[--] Bug #80860 MySQL 5.7: Avoid testing password when validate_password is activated

-------- CVE Security Recommendations --------------------------------------------------------------
[OK] NO SECURITY CVE FOUND FOR YOUR VERSION

-------- Performance Metrics -----------------------------------------------------------------------
[--] Up for: 22h 4m 8s (2M q [35.917 qps], 1K conn, TX: 6G, RX: 466M)
[--] Reads / Writes: 85% / 15%
[--] Binary logging is disabled
[--] Physical Memory     : 15.3G
[--] Max MySQL memory    : 6.1G
[--] Other process memory: 80.6M
[--] Total buffers: 5.2G global + 3.4M per thread (251 max threads)
[--] P_S Max memory usage: 72B
[--] Galera GCache Max memory usage: 0B
[OK] Maximum reached memory usage: 5.7G (37.10% of installed RAM)
[OK] Maximum possible memory usage: 6.1G (39.47% of installed RAM)
[OK] Overall possible memory usage with other process is compatible with memory available
[OK] Slow queries: 0% (0/2M)
[OK] Highest usage of available connections: 56% (141/251)
[OK] Aborted connections: 0.17%  (3/1777)
[!!] Query cache may be disabled by default due to mutex contention.
[OK] Query cache efficiency: 83.5% (2M cached / 2M selects)
[OK] Query cache prunes per day: 0
[!!] Sorts requiring temporary tables: 18% (71K temp sorts / 384K sorts)
[!!] Joins performed without indexes: 35447
[OK] Temporary tables created on disk: 9% (64K on disk / 669K total)
[OK] Thread cache hit rate: 84% (277 created / 1K connections)
[!!] Table cache hit rate: 1% (2K open / 174K opened)
[OK] Open file limit used: 0% (18/5K)
[OK] Table locks acquired immediately: 100% (2K immediate / 2K locks)

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

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

-------- MyISAM Metrics ----------------------------------------------------------------------------
[!!] Key buffer used: 19.2% (2M used / 10M cache)
[OK] Key buffer size / total MyISAM indexes: 10.0M/53.0K
[OK] Read Key buffer hit rate: 99.2% (5K cached / 41 reads)
[OK] Write Key buffer hit rate: 100.0% (4 cached / 4 writes)

-------- InnoDB Metrics ----------------------------------------------------------------------------
[--] InnoDB is enabled.
[--] InnoDB Thread Concurrency: 0
[OK] InnoDB File per table is activated
[!!] InnoDB buffer pool / data size: 5.0G/6.0G
[!!] Ratio InnoDB log file size / InnoDB Buffer pool size (40 %): 1.0G * 2/5.0G should be equal 25%
[!!] InnoDB buffer pool instances: 4
[--] Number of InnoDB Buffer Pool Chunk : 40 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: 100.00% (51305369441 hits/ 51305452595 total)
[!!] InnoDB Write Log efficiency: 69.26% (52996 hits/ 76513 total)
[OK] InnoDB log waits: 0.00% (0 waits / 23517 writes)

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

-------- TokuDB Metrics ----------------------------------------------------------------------------
[--] TokuDB is disabled.

-------- XtraDB Metrics ----------------------------------------------------------------------------
[--] XtraDB is disabled.

-------- RocksDB Metrics ---------------------------------------------------------------------------
[--] RocksDB is disabled.

-------- Spider Metrics ----------------------------------------------------------------------------
[--] Spider is disabled.

-------- Connect Metrics ---------------------------------------------------------------------------
[--] Connect is disabled.

-------- Galera Metrics ----------------------------------------------------------------------------
[--] Galera is disabled.

-------- Replication Metrics -----------------------------------------------------------------------
[--] Galera Synchronous replication: NO
[--] No replication slave(s) for this server.
[--] This is a standalone server.

-------- Recommendations ---------------------------------------------------------------------------
General recommendations:
    Control error line(s) into /var/log/mysql/error.log file
    Set up a Password for user with the following SQL statement ( SET PASSWORD FOR 'user'@'SpecificDNSorIp' = PASSWORD('secure_password'); )
    MySQL started within last 24 hours - recommendations may be inaccurate
    Adjust your join queries to always utilize indexes
    Increase table_open_cache gradually to avoid file descriptor limits
    Read this before increasing table_open_cache over 64: http://bit.ly/1mi7c4C
    Beware that open_files_limit (5000) variable
    should be greater than table_open_cache (2369)
Variables to adjust:
    query_cache_size (=0)
    query_cache_type (=0)
    sort_buffer_size (> 1M)
    read_rnd_buffer_size (> 1M)
    join_buffer_size (> 1.0M, or always use indexes with joins)
    table_open_cache (> 2369)
    innodb_buffer_pool_size (>= 5G) if possible.
    innodb_log_file_size * innodb_log_files_in_group should be equal to 1/4 of buffer pool size (=2G) if possible.
    innodb_buffer_pool_instances(=5)