>>  MySQLTuner 1.7.19 - 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 10.3.17-MariaDB-1:10.3.17+maria~stretch-log
[OK] Operating on 64-bit architecture

-------- Log file Recommendations ------------------------------------------------------------------
[OK] Log file /var/lib/mysql/debian-s-8vcpu-32gb-fra1-01.err exists
[--] Log file: /var/lib/mysql/debian-s-8vcpu-32gb-fra1-01.err(1M)
[OK] Log file /var/lib/mysql/debian-s-8vcpu-32gb-fra1-01.err is readable.
[OK] Log file /var/lib/mysql/debian-s-8vcpu-32gb-fra1-01.err is not empty
[OK] Log file /var/lib/mysql/debian-s-8vcpu-32gb-fra1-01.err is smaller than 32 Mb
[!!] /var/lib/mysql/debian-s-8vcpu-32gb-fra1-01.err contains 7272 warning(s).
[!!] /var/lib/mysql/debian-s-8vcpu-32gb-fra1-01.err contains 7223 error(s).
[--] 8 start(s) detected in /var/lib/mysql/debian-s-8vcpu-32gb-fra1-01.err
[--] 1) 2020-01-03  4:58:14 0 [Note] /usr/sbin/mysqld: ready for connections.
[--] 2) 2020-01-02  8:50:27 0 [Note] /usr/sbin/mysqld: ready for connections.
[--] 3) 2020-01-02  8:49:41 0 [Note] /usr/sbin/mysqld: ready for connections.
[--] 4) 2020-01-02  8:20:42 0 [Note] /usr/sbin/mysqld: ready for connections.
[--] 5) 2020-01-01 14:07:49 0 [Note] /usr/sbin/mysqld: ready for connections.
[--] 6) 2019-12-18  8:44:55 0 [Note] /usr/sbin/mysqld: ready for connections.
[--] 7) 2019-12-17  9:44:03 0 [Note] /usr/sbin/mysqld: ready for connections.
[--] 8) 2019-12-11 11:45:09 0 [Note] /usr/sbin/mysqld: ready for connections.
[--] 7 shutdown(s) detected in /var/lib/mysql/debian-s-8vcpu-32gb-fra1-01.err
[--] 1) 2020-01-03  4:57:48 0 [Note] /usr/sbin/mysqld: Shutdown complete
[--] 2) 2020-01-02  8:49:58 0 [Note] /usr/sbin/mysqld: Shutdown complete
[--] 3) 2020-01-02  8:49:37 0 [Note] /usr/sbin/mysqld: Shutdown complete
[--] 4) 2020-01-02  8:20:15 0 [Note] /usr/sbin/mysqld: Shutdown complete
[--] 5) 2019-12-18  8:44:28 0 [Note] /usr/sbin/mysqld: Shutdown complete
[--] 6) 2019-12-17  8:43:36 0 [Note] /usr/sbin/mysqld: Shutdown complete
[--] 7) 2019-12-11 11:39:58 0 [Note] /usr/sbin/mysqld: Shutdown complete

-------- Storage Engine Statistics -----------------------------------------------------------------
[--] Status: +Aria +CSV +InnoDB +MEMORY +MRG_MyISAM +MyISAM +PERFORMANCE_SCHEMA +SEQUENCE
[--] Data in InnoDB tables: 1.8G (Tables: 12)
[--] Data in MyISAM tables: 6.9G (Tables: 462)
[--] Data in MEMORY tables: 53.5M (Tables: 18)
[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
[OK] All database users have passwords assigned
[!!] User 'cron@%' 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: 9h 34m 30s (54M q [1K qps], 4M conn, TX: 12G, RX: 7G)
[--] Reads / Writes: 94% / 6%
[--] Binary logging is enabled (GTID MODE: OFF)
[--] Physical Memory     : 31.4G
[--] Max MySQL memory    : 72.0G
[--] Other process memory: 0B
[--] Total buffers: 4.2G global + 34.3M per thread (2000 max threads)
[--] P_S Max memory usage: 865M
[--] Galera GCache Max memory usage: 0B
[OK] Maximum reached memory usage: 12.1G (38.61% of installed RAM)
[!!] Maximum possible memory usage: 72.0G (229.01% of installed RAM)
[!!] Overall possible memory usage with other process exceeded memory
[OK] Slow queries: 0% (1K/54M)
[OK] Highest usage of available connections: 10% (213/2000)
[OK] Aborted connections: 0.00%  (0/4725626)
[OK] Query cache is disabled by default due to mutex contention on multiprocessor machines.
[OK] Sorts requiring temporary tables: 0% (124 temp sorts / 2M sorts)
[!!] Joins performed without indexes: 486
[OK] Temporary tables created on disk: 0% (285 on disk / 1M total)
[OK] Thread cache hit rate: 99% (1K created / 4M connections)
[!!] Table cache hit rate: 12% (494 open / 4K opened)
[OK] table_definition_cache(2048) is upper than number of tables(651)
[OK] Open file limit used: 1% (398/24K)
[OK] Table locks acquired immediately: 99% (46M immediate / 46M locks)
[OK] Binlog cache memory access: 100.00% (316956 Memory / 316956 Total)

-------- Performance schema ------------------------------------------------------------------------
[--] Memory used by P_S: 865.9M
[--] 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 (10.3.17-MariaDB-1:10.3.17+maria~stretch-log)

-------- MyISAM Metrics ----------------------------------------------------------------------------
[!!] Key buffer used: 20.0% (429M used / 2B cache)
[OK] Key buffer size / total MyISAM indexes: 2.0G/2.1G
[OK] Read Key buffer hit rate: 99.9% (313M cached / 197K reads)
[!!] Write Key buffer hit rate: 93.8% (1M cached / 1M writes)

-------- InnoDB Metrics ----------------------------------------------------------------------------
[--] InnoDB is enabled.
[--] InnoDB Thread Concurrency: 0
[OK] InnoDB File per table is activated
[OK] InnoDB buffer pool / data size: 2.0G/1.8G
[!!] Ratio InnoDB log file size / InnoDB Buffer pool size (1.953125 %): 20.0M * 2/2.0G should be equal to 25%
[!!] InnoDB buffer pool instances: 8
[--] Number of InnoDB Buffer Pool Chunk : 16 for 8 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% (32120020459 hits/ 32120129823 total)
[!!] InnoDB Write Log efficiency: 66.45% (610051 hits/ 918022 total)
[OK] InnoDB log waits: 0.00% (0 waits / 307971 writes)

-------- AriaDB Metrics ----------------------------------------------------------------------------
[--] AriaDB is enabled.
[OK] Aria pagecache size / total Aria indexes: 128.0M/1B
[OK] Aria pagecache hit rate: 100.0% (40M cached / 285 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:
    Control warning line(s) into /var/lib/mysql/debian-s-8vcpu-32gb-fra1-01.err file
    Control error line(s) into /var/lib/mysql/debian-s-8vcpu-32gb-fra1-01.err file
    Restrict Host for 'cron'@% to cron@SpecificDNSorIp
    UPDATE mysql.user SET host ='SpecificDNSorIp' WHERE user='cron' AND host ='%'; FLUSH PRIVILEGES;
    MySQL was started within the last 24 hours - recommendations may be inaccurate
    Reduce your overall MySQL memory footprint for system stability
    Dedicate this server to your database for highest 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).
    Increase table_open_cache gradually to avoid file descriptor limits
    Read this before increasing table_open_cache over 64: https://bit.ly/1mi7c4C
    Read this before increasing for MariaDB https://mariadb.com/kb/en/library/optimizing-table_open_cache/
    This is MyISAM only table_cache scalability problem, InnoDB not affected.
    See more details here: https://bugs.mysql.com/bug.php?id=49177
    This bug already fixed in MySQL 5.7.9 and newer MySQL versions.
    Beware that open_files_limit (24576) variable
    should be greater than table_open_cache (512)
    Consider installing Sys schema from https://github.com/mysql/mysql-sys for MySQL
    Consider installing Sys schema from https://github.com/good-dba/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 ***
    join_buffer_size (> 20.0M, or always use indexes with JOINs)
    table_open_cache (> 512)
    innodb_log_file_size should be (=256M) if possible, so InnoDB total log files size equals to 25% of buffer pool size.
    innodb_buffer_pool_instances(=2)