>>  MySQLTuner 1.7.19 - 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
[--] Performing tests on 127.0.0.1:3306
Please enter your MySQL administrative login: root
Please enter your MySQL administrative password: [OK] Currently running supported MySQL version 10.3.15-MariaDB
[OK] Operating on 64-bit architecture

-------- Log file Recommendations ------------------------------------------------------------------
[OK] Log file /var/log/mysql/error.log exists
[--] Log file: /var/log/mysql/error.log(350M)
[OK] Log file /var/log/mysql/error.log is readable.
[OK] Log file /var/log/mysql/error.log is not empty
[!!] Log file /var/log/mysql/error.log is bigger than 32 Mb
[!!] /var/log/mysql/error.log contains 3105917 warning(s).
[!!] /var/log/mysql/error.log contains 401272 error(s).
[--] 21 start(s) detected in /var/log/mysql/error.log
[--] 1) 2019-11-20  0:08:52 0 [Note] /usr/sbin/mysqld: ready for connections.
[--] 2) 2019-10-05 10:15:23 0 [Note] /usr/sbin/mysqld: ready for connections.
[--] 3) 2019-09-11 15:55:03 0 [Note] /usr/sbin/mysqld: ready for connections.
[--] 4) 2019-09-11 13:44:01 0 [Note] /usr/sbin/mysqld: ready for connections.
[--] 5) 2019-07-31 19:15:35 0 [Note] /usr/sbin/mysqld: ready for connections.
[--] 6) 2019-06-18 21:44:33 0 [Note] /usr/sbin/mysqld: ready for connections.
[--] 7) 2019-06-17 23:23:59 0 [Note] /usr/sbin/mysqld: ready for connections.
[--] 8) 2019-06-15 12:01:51 0 [Note] /usr/sbin/mysqld: ready for connections.
[--] 9) 2019-06-14 12:03:45 0 [Note] /usr/sbin/mysqld: ready for connections.
[--] 10) 2019-06-13 23:25:46 0 [Note] /usr/sbin/mysqld: ready for connections.
[--] 19 shutdown(s) detected in /var/log/mysql/error.log
[--] 1) 2019-11-20  0:08:47 0 [Note] /usr/sbin/mysqld: Shutdown complete
[--] 2) 2019-10-05 10:14:30 0 [Note] /usr/sbin/mysqld: Shutdown complete
[--] 3) 2019-09-11 15:54:58 0 [Note] /usr/sbin/mysqld: Shutdown complete
[--] 4) 2019-09-11 13:41:26 0 [Note] /usr/sbin/mysqld: Shutdown complete
[--] 5) 2019-07-31 18:58:49 0 [Note] /usr/sbin/mysqld: Shutdown complete
[--] 6) 2019-06-18 21:41:49 0 [Note] /usr/sbin/mysqld: Shutdown complete
[--] 7) 2019-06-17 23:22:44 0 [Note] /usr/sbin/mysqld: Shutdown complete
[--] 8) 2019-06-15 12:01:47 0 [Note] /usr/sbin/mysqld: Shutdown complete
[--] 9) 2019-06-14 12:03:42 0 [Note] /usr/sbin/mysqld: Shutdown complete
[--] 10) 2019-06-13 23:22:54 0 [Note] /usr/sbin/mysqld: Shutdown complete

-------- Storage Engine Statistics -----------------------------------------------------------------
[--] Status: +Aria +CSV +InnoDB +MEMORY +MRG_MyISAM +MyISAM +PERFORMANCE_SCHEMA +SEQUENCE
[--] Data in MyISAM tables: 6.2M (Tables: 117)
[--] Data in InnoDB tables: 38.8G (Tables: 316)
[!!] Total fragmented tables: 1

-------- 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
[OK] All database users have passwords assigned
[!!] User 'xxxxxxxx@%' does not specify hostname restrictions.
[!!] User 'xxxxxxxx@%' does not specify hostname restrictions.
[!!] User 'root@%' does not specify hostname restrictions.
[!!] User 'xxxxxxxx@%' does not specify hostname restrictions.
[!!] User 'xxxxxxxx@%' does not specify hostname restrictions.
[--] There are 620 basic passwords in the list.

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

-------- Performance Metrics -----------------------------------------------------------------------
[--] Up for: 65d 23h 26m 6s (4B q [782.794 qps], 212M conn, TX: 40826G, RX: 572G)
[--] Reads / Writes: 96% / 4%
[--] Binary logging is disabled
[--] Physical Memory     : 15.5G
[--] Max MySQL memory    : 23.5G
[--] Other process memory: 0B
[--] Total buffers: 8.5G global + 30.6M per thread (500 max threads)
[--] P_S Max memory usage: 0B
[--] Galera GCache Max memory usage: 0B
[!!] Maximum reached memory usage: 17.5G (113.01% of installed RAM)
[!!] Maximum possible memory usage: 23.5G (151.30% of installed RAM)
[!!] Overall possible memory usage with other process exceeded memory
[OK] Slow queries: 0% (3K/4B)
[OK] Highest usage of available connections: 60% (301/500)
[OK] Aborted connections: 0.04%  (93147/212540381)
[!!] Query cache may be disabled by default due to mutex contention.
[OK] Query cache efficiency: 24.0% (1B cached / 5B selects)
[!!] Query cache prunes per day: 183329
[OK] Sorts requiring temporary tables: 0% (53 temp sorts / 292M sorts)
[!!] Joins performed without indexes: 52622
[OK] Temporary tables created on disk: 0% (322K on disk / 34M total)
[OK] Thread cache hit rate: 96% (7M created / 212M connections)
[OK] Table cache hit rate: 70% (4K open / 5K opened)
[!!] table_definition_cache(400) is lower than number of tables(598)
[OK] Open file limit used: 1% (269/16K)
[OK] Table locks acquired immediately: 100% (8M immediate / 8M 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 (10.3.15-MariaDB)

-------- MyISAM Metrics ----------------------------------------------------------------------------
[!!] Key buffer used: 18.6% (3M used / 16M cache)
[OK] Key buffer size / total MyISAM indexes: 16.0M/2.8M
[OK] Read Key buffer hit rate: 100.0% (16M cached / 49 reads)
[!!] Write Key buffer hit rate: 75.5% (155 cached / 117 writes)

-------- InnoDB Metrics ----------------------------------------------------------------------------
[--] InnoDB is enabled.
[--] InnoDB Thread Concurrency: 0
[OK] InnoDB File per table is activated
[!!] InnoDB buffer pool / data size: 8.2G/38.8G
[!!] Ratio InnoDB log file size / InnoDB Buffer pool size (48.4848484848485 %): 2.0G * 2/8.2G should be equal to 25%
[!!] InnoDB buffer pool instances: 6
[--] Number of InnoDB Buffer Pool Chunk : 66 for 6 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% (1142523932247 hits/ 1142567012459 total)
[OK] InnoDB Write log efficiency: 98.05% (334204576 hits/ 340844667 total)
[OK] InnoDB log waits: 0.00% (0 waits / 6640091 writes)

-------- AriaDB Metrics ----------------------------------------------------------------------------
[--] AriaDB is enabled.
[OK] Aria pagecache size / total Aria indexes: 128.0M/1B
[OK] Aria pagecache hit rate: 100.0% (459M cached / 83K reads)

-------- 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: MIXED
[--] XA support enabled: ON
[--] Semi synchronous replication Master: OFF
[--] Semi synchronous replication Slave: OFF
[--] This is a standalone server

-------- Recommendations ---------------------------------------------------------------------------
General recommendations:
    /var/log/mysql/error.log is > 32Mb, you should analyze why or implement a rotation log strategy such as logrotate!
    Control warning line(s) into /var/log/mysql/error.log file
    Control error line(s) into /var/log/mysql/error.log file
    Run OPTIMIZE TABLE to defragment tables for better performance
      OPTIMIZE TABLE `xxxxxxxx`.`xxxxxxxx`; -- can free 1902 MB
    Total freed space after theses OPTIMIZE TABLE : 1902 Mb
    Restrict Host for 'xxxxxxxx'@% to xxxxxxxx@SpecificDNSorIp
    UPDATE mysql.user SET host ='SpecificDNSorIp' WHERE user='xxxxxxxx' AND host ='%'; FLUSH PRIVILEGES;
    Restrict Host for 'xxxxxxxx'@% to xxxxxxxx@SpecificDNSorIp
    UPDATE mysql.user SET host ='SpecificDNSorIp' WHERE user='xxxxxxxx' AND host ='%'; FLUSH PRIVILEGES;
    Restrict Host for 'root'@% to root@SpecificDNSorIp
    UPDATE mysql.user SET host ='SpecificDNSorIp' WHERE user='root' AND host ='%'; FLUSH PRIVILEGES;
    Restrict Host for 'xxxxxxxx'@% to xxxxxxxx@SpecificDNSorIp
    UPDATE mysql.user SET host ='SpecificDNSorIp' WHERE user='xxxxxxxx' AND host ='%'; FLUSH PRIVILEGES;
    Restrict Host for 'xxxxxxxx'@% to xxxxxxxx@SpecificDNSorIp
    UPDATE mysql.user SET host ='SpecificDNSorIp' WHERE user='xxxxxxxx' AND host ='%'; FLUSH PRIVILEGES;
    Reduce your overall MySQL memory footprint for system stability
    Dedicate this server to your database for highest performance.
    Increasing the query_cache size over 128M may reduce performance
    We will suggest raising the 'join_buffer_size' until JOINs not using indexes are found.
             See https://dev.mysql.com/doc/internals/en/join-buffer-size.html
             (specially the conclusions at the bottom of the page).
    Performance schema should be activated for better diagnostics
    Consider installing Sys schema from https://github.com/mysql/mysql-sys for MySQL
    Consider installing Sys schema from https://github.com/FromDual/mariadb-sys for MariaDB
    Before changing innodb_log_file_size and/or innodb_log_files_in_group read this: https://bit.ly/2TcGgtU
Variables to adjust:
  *** MySQL's maximum memory usage is dangerously high ***
  *** Add RAM before increasing MySQL buffer variables ***
    query_cache_size (=0)
    query_cache_type (=0)
    query_cache_size (> 128M) [see warning above]
    join_buffer_size (> 4.0M, or always use indexes with JOINs)
    table_definition_cache(400) > 598 or -1 (autosizing if supported)
    performance_schema = ON enable PFS
    innodb_buffer_pool_size (>= 38.8G) if possible.
    innodb_log_file_size should be (=1G) if possible, so InnoDB total log files size equals to 25% of buffer pool size.
    innodb_buffer_pool_instances(=8)