root@vps55436:~# ./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 10.1.26-MariaDB-0+deb9u1
[OK] Operating on 64-bit architecture

-------- Log file Recommendations ------------------------------------------------------------------
[--] Log file: /var/log/mysql/error.log(10K)
[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
[!!] /var/log/mysql/error.log contains 61 warning(s).
[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: +Aria +CSV +InnoDB +MEMORY +MRG_MyISAM +MyISAM +PERFORMANCE_SCHEMA +SEQUENCE
[--] Data in MyISAM tables: 5.8M (Tables: 101)
[--] Data in InnoDB tables: 808.0M (Tables: 2423)
[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
[!!] User 'root@localhost' has no password set.
[!!] User 'MSbeton@%' does not specify hostname restrictions.
[!!] User 'adminmsmedecin@%' does not specify hostname restrictions.
[!!] User 'facarchitest@%' 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: 4d 13h 5m 30s (7M q [20.145 qps], 217K conn, TX: 24G, RX: 1G)
[--] Reads / Writes: 86% / 14%
[--] Binary logging is disabled
[--] Physical Memory     : 8.0G
[--] Max MySQL memory    : 3.5G
[--] Other process memory: 0B
[--] Total buffers: 3.3G global + 2.1M per thread (66 max threads)
[--] P_S Max memory usage: 82M
[--] Galera GCache Max memory usage: 0B
[OK] Maximum reached memory usage: 3.5G (43.80% of installed RAM)
[OK] Maximum possible memory usage: 3.5G (44.00% of installed RAM)
[OK] Overall possible memory usage with other process is compatible with memory available
[OK] Slow queries: 0% (0/7M)
[!!] Highest connection usage: 87%  (58/66)
[!!] Aborted connections: 6.14%  (13378/217859)
[!!] name resolution is active : a reverse name resolution is made for each new connection and can reduce performance
[!!] Query cache may be disabled by default due to mutex contention.
[OK] Query cache efficiency: 43.4% (4M cached / 10M selects)
[!!] Query cache prunes per day: 54692
[OK] Sorts requiring temporary tables: 0% (0 temp sorts / 154K sorts)
[!!] Joins performed without indexes: 2369
[!!] Temporary tables created on disk: 53% (162K on disk / 302K total)
[OK] Thread cache hit rate: 89% (23K created / 217K connections)
[!!] Table cache hit rate: 14% (4K open / 27K opened)
[OK] Open file limit used: 1% (224/16K)
[OK] Table locks acquired immediately: 99% (2M immediate / 2M locks)

-------- Performance schema ------------------------------------------------------------------------
[--] Memory used by P_S: 82.1M
[--] Sys schema isn't installed.

-------- ThreadPool Metrics ------------------------------------------------------------------------
[--] ThreadPool stat is enabled.
[--] Thread Pool Size: 3 thread(s).
[--] Using default value is good enough for your version (10.1.26-MariaDB-0+deb9u1)

-------- MyISAM Metrics ----------------------------------------------------------------------------
[!!] Key buffer used: 18.3% (196M used / 1B cache)
[OK] Key buffer size / total MyISAM indexes: 1.0G/504.0K
[OK] Read Key buffer hit rate: 100.0% (1M cached / 525 reads)
[!!] Write Key buffer hit rate: 66.5% (396K cached / 263K 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/808.0M
[OK] Ratio InnoDB log file size / InnoDB Buffer pool size: 256.0M * 2/2.0G should be equal to 25%
[OK] InnoDB buffer pool instances: 2
[--] InnoDB Buffer Pool Chunk Size not used or defined in your version
[OK] InnoDB Read buffer efficiency: 99.93% (78682552 hits/ 78734007 total)
[!!] InnoDB Write Log efficiency: 47.12% (583302 hits/ 1238025 total)
[OK] InnoDB log waits: 0.00% (0 waits / 654723 writes)

-------- AriaDB Metrics ----------------------------------------------------------------------------
[--] AriaDB is enabled.
[OK] Aria pagecache size / total Aria indexes: 128.0M/1B
[!!] Aria pagecache hit rate: 93.0% (2M cached / 159K 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: 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/mysql/error.log file
    Set up a Password for user with the following SQL statement ( SET PASSWORD FOR 'user'@'SpecificDNSorIp' = PASSWORD('secure_password'); )
    Restrict Host for user@% to user@SpecificDNSorIp
    Reduce or eliminate persistent connections to reduce connection usage
    Reduce or eliminate unclosed connections and network issues
    Configure your accounts with ip or subnets only, then update your configuration with skip-name-resolve=1
    Adjust your join queries to always utilize indexes
    When making adjustments, make tmp_table_size/max_heap_table_size equal
    Reduce your SELECT DISTINCT queries which have no LIMIT clause
    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 (16364) variable
    should be greater than table_open_cache (4096)
    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
Variables to adjust:
    max_connections (> 66)
    wait_timeout (< 28800)
    interactive_timeout (< 28800)
    query_cache_size (=0)
    query_cache_type (=0)
    query_cache_size (> 32M)
    join_buffer_size (> 680.0K, or always use indexes with JOINs)
    tmp_table_size (> 128M)
    max_heap_table_size (> 128M)
    table_open_cache (> 4096)