von Samuel LMB.
I am the Admin AND i am a Math teacher .. and yes we are many teachers of a Lycee in France ( 800 students from 15 to 19 years old ) . Some of my courses and colleagues courses have issues with many duplicate questions quiz and categories .
here is the result of mysqltuner.pl :
>> MySQLTuner 2.7.0
* Jean-Marie Renouard * Major Hayden >> Bug reports, feature requests, and downloads at http://mysqltuner.pl/
>> Run with '--help' for additional options and output filtering
ℹ Skipped version check for MySQLTuner script
✔ Logged in using credentials passed on the command line
✘ Failed to execute: SHOW REPLICA STATUS\G
✘ FAIL Execute SQL / return code: 256
✘ Failed to execute: SHOW SLAVE STATUS\G
✘ FAIL Execute SQL / return code: 256
✔ Operating on 64-bit architecture
-------- Storage Engine Statistics --------------------------------------------- --------------------
ℹ Status: +Aria +CSV +InnoDB +MEMORY +MRG_MyISAM +MyISAM +PERFORMANCE_SCHEMA +S EQUENCE
ℹ Data in InnoDB tables: 5.9G (Tables: 561)
✔ Total fragmented tables: 0
✔ Currently running supported MySQL version 11.4.8
-------- Log file Recommendations ---------------------------------------------- --------------------
✘ Log file /speed/mysql/error_serv.log doesn't exist
-------- Analysis Performance Metrics ------------------------------------------ --------------------
ℹ innodb_stats_on_metadata: OFF
✔ No stat updates during querying INFORMATION_SCHEMA.
-------- Views Metrics --------------------------------------------------------- --------------------
-------- Triggers Metrics ------------------------------------------------------ --------------------
-------- Routines Metrics ------------------------------------------------------ --------------------
-------- Security Recommendations ---------------------------------------------- --------------------
ℹ MariaDBServer - 11.4.8
ℹ Skipped due to unsupported feature for MySQL 8.0+
-------- CVE Security Recommendations ------------------------------------------ --------------------
ℹ Skipped due to --cvefile option undefined
-------- Performance Metrics --------------------------------------------------- --------------------
ℹ Up for: 2d 12h 5m 32s (358M q [1K qps], 1M conn, TX: 3142G, RX: 75G)
ℹ Reads / Writes: 93% / 7%
ℹ Binary logging is disabled
ℹ Physical Memory : 125.3G
ℹ Max MySQL memory : 42.9G
ℹ Other process memory: 0B
ℹ Total buffers: 11.3G global + 16.2M per thread (2000 max threads)
ℹ Performance_schema Max memory usage: 0B
ℹ Galera GCache Max memory usage: 0B
✔ Maximum reached memory usage: 13.9G (11.12% of installed RAM)
✔ Maximum possible memory usage: 42.9G (34.28% of installed RAM)
✔ Overall possible memory usage with other process is compatible with memory av ailable
✔ Slow queries: 0% (151/358M)
✔ Highest usage of available connections: 8% (168/2000)
✔ Aborted connections: 0.03% (333/1082888)
✘ Name resolution is active: a reverse name resolution is made for each new con nection which can reduce performance
✔ Query cache is disabled by default due to mutex contention on multiprocessor machines.
✔ Sorts requiring temporary tables: 0% (403 temp sorts / 36M sorts)
✘ Joins performed without indexes: 3482675
✔ Temporary tables created on disk: 19% (5M on disk / 25M total)
✔ Thread cache hit rate: 99% (259 created / 1M connections)
✔ Table cache hit rate: 99% (369M hits / 369M requests)
✔ table_definition_cache (729088) is greater than number of tables (646)
✔ Open file limit used: 0% (20K/9M)
✔ Table locks acquired immediately: 99% (53M immediate / 53M locks)
-------- Performance schema ---------------------------------------------------- --------------------
✘ Performance_schema should be activated.
ℹ Sys schema is not installed.
-------- ThreadPool Metrics ---------------------------------------------------- --------------------
ℹ ThreadPool stat is disabled.
-------- MyISAM Metrics -------------------------------------------------------- --------------------
ℹ General MyIsam metrics:
ℹ +-- Total MyISAM Tables : 0
ℹ +-- Total MyISAM indexes : 0B
ℹ +-- KB Size :1.0G
ℹ +-- KB Used Size :315.4M
ℹ +-- KB used :30.8%
ℹ +-- Read KB hit rate: 100.0% (1B cached / 142K reads)
ℹ +-- Write KB hit rate: 78.5% (2M cached / 2M writes)
ℹ No MyISAM table(s) detected ....
-------- InnoDB Metrics -------------------------------------------------------- --------------------
ℹ InnoDB is enabled.
✔ InnoDB File per table is activated
✔ InnoDB Buffer Pool size ( 8.0G ) under limit for 64 bits architecture: (17179 869184.0G )
✔ InnoDB buffer pool / data size: 8.0G / 5.9G
✔ Ratio InnoDB log file size / InnoDB Buffer pool size: 2.0G * 1/8.0G should be equal to 25%
✘ Cannot calculate InnoDB Buffer Pool Chunk breakdown due to missing or zero va lues:
ℹ - innodb_buffer_pool_size: 8589934592
ℹ - innodb_buffer_pool_chunk_size: 0
ℹ - innodb_buffer_pool_instances: 1
✔ InnoDB Read buffer efficiency: 99.87% (12173784774 hits / 12189155224 total)
✔ InnoDB Write Log efficiency: 92.92% (303142748 hits / 326236065 total)
✔ InnoDB log waits: 0.00% (0 waits / 23093317 writes)
-------- Aria Metrics ---------------------------------------------------------- --------------------
ℹ Aria Storage Engine is enabled.
✔ Aria pagecache size / total Aria indexes: 2.0G/0B
✔ Aria pagecache hit rate: 99.5% (70M cached / 376K reads)
-------- TokuDB Metrics -------------------------------------------------------- --------------------
ℹ TokuDB is disabled.
-------- XtraDB Metrics -------------------------------------------------------- --------------------
ℹ XtraDB is disabled.
-------- Galera Metrics -------------------------------------------------------- --------------------
ℹ Galera is disabled.
-------- Replication Metrics --------------------------------------------------- --------------------
ℹ Galera Synchronous replication: NO
ℹ No replication slave(s) for this server.
ℹ Binlog format: MIXED
ℹ XA support enabled: ON
ℹ Semi synchronous replication Master: OFF
ℹ Semi synchronous replication Slave: OFF
ℹ This is a standalone server
-------- Recommendations ------------------------------------------------------- --------------------
General recommendations:
Configure your accounts with ip or subnets only, then update your configurat ion with skip-name-resolve=ON
We will suggest raising the 'join_buffer_size' until JOINs not using indexes are found.
See https://dev.mysql.com/doc/refman/8.0/en/server-system-variables .html#sysvar_join_buffer_size
Performance schema should be activated for better diagnostics
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 t his: https://bit.ly/2TcGgtU
Variables to adjust:
skip-name-resolve=ON
join_buffer_size (> 4.0M, or always use indexes with JOINs)
performance_schema=ON
thanks and sorry for my bad english![zwinkernd]( "zwinkernd")
Sam
here is the result of mysqltuner.pl :
>> MySQLTuner 2.7.0
* Jean-Marie Renouard * Major Hayden >> Bug reports, feature requests, and downloads at http://mysqltuner.pl/
>> Run with '--help' for additional options and output filtering
ℹ Skipped version check for MySQLTuner script
✔ Logged in using credentials passed on the command line
✘ Failed to execute: SHOW REPLICA STATUS\G
✘ FAIL Execute SQL / return code: 256
✘ Failed to execute: SHOW SLAVE STATUS\G
✘ FAIL Execute SQL / return code: 256
✔ Operating on 64-bit architecture
-------- Storage Engine Statistics --------------------------------------------- --------------------
ℹ Status: +Aria +CSV +InnoDB +MEMORY +MRG_MyISAM +MyISAM +PERFORMANCE_SCHEMA +S EQUENCE
ℹ Data in InnoDB tables: 5.9G (Tables: 561)
✔ Total fragmented tables: 0
✔ Currently running supported MySQL version 11.4.8
-------- Log file Recommendations ---------------------------------------------- --------------------
✘ Log file /speed/mysql/error_serv.log doesn't exist
-------- Analysis Performance Metrics ------------------------------------------ --------------------
ℹ innodb_stats_on_metadata: OFF
✔ No stat updates during querying INFORMATION_SCHEMA.
-------- Views Metrics --------------------------------------------------------- --------------------
-------- Triggers Metrics ------------------------------------------------------ --------------------
-------- Routines Metrics ------------------------------------------------------ --------------------
-------- Security Recommendations ---------------------------------------------- --------------------
ℹ MariaDBServer - 11.4.8
ℹ Skipped due to unsupported feature for MySQL 8.0+
-------- CVE Security Recommendations ------------------------------------------ --------------------
ℹ Skipped due to --cvefile option undefined
-------- Performance Metrics --------------------------------------------------- --------------------
ℹ Up for: 2d 12h 5m 32s (358M q [1K qps], 1M conn, TX: 3142G, RX: 75G)
ℹ Reads / Writes: 93% / 7%
ℹ Binary logging is disabled
ℹ Physical Memory : 125.3G
ℹ Max MySQL memory : 42.9G
ℹ Other process memory: 0B
ℹ Total buffers: 11.3G global + 16.2M per thread (2000 max threads)
ℹ Performance_schema Max memory usage: 0B
ℹ Galera GCache Max memory usage: 0B
✔ Maximum reached memory usage: 13.9G (11.12% of installed RAM)
✔ Maximum possible memory usage: 42.9G (34.28% of installed RAM)
✔ Overall possible memory usage with other process is compatible with memory av ailable
✔ Slow queries: 0% (151/358M)
✔ Highest usage of available connections: 8% (168/2000)
✔ Aborted connections: 0.03% (333/1082888)
✘ Name resolution is active: a reverse name resolution is made for each new con nection which can reduce performance
✔ Query cache is disabled by default due to mutex contention on multiprocessor machines.
✔ Sorts requiring temporary tables: 0% (403 temp sorts / 36M sorts)
✘ Joins performed without indexes: 3482675
✔ Temporary tables created on disk: 19% (5M on disk / 25M total)
✔ Thread cache hit rate: 99% (259 created / 1M connections)
✔ Table cache hit rate: 99% (369M hits / 369M requests)
✔ table_definition_cache (729088) is greater than number of tables (646)
✔ Open file limit used: 0% (20K/9M)
✔ Table locks acquired immediately: 99% (53M immediate / 53M locks)
-------- Performance schema ---------------------------------------------------- --------------------
✘ Performance_schema should be activated.
ℹ Sys schema is not installed.
-------- ThreadPool Metrics ---------------------------------------------------- --------------------
ℹ ThreadPool stat is disabled.
-------- MyISAM Metrics -------------------------------------------------------- --------------------
ℹ General MyIsam metrics:
ℹ +-- Total MyISAM Tables : 0
ℹ +-- Total MyISAM indexes : 0B
ℹ +-- KB Size :1.0G
ℹ +-- KB Used Size :315.4M
ℹ +-- KB used :30.8%
ℹ +-- Read KB hit rate: 100.0% (1B cached / 142K reads)
ℹ +-- Write KB hit rate: 78.5% (2M cached / 2M writes)
ℹ No MyISAM table(s) detected ....
-------- InnoDB Metrics -------------------------------------------------------- --------------------
ℹ InnoDB is enabled.
✔ InnoDB File per table is activated
✔ InnoDB Buffer Pool size ( 8.0G ) under limit for 64 bits architecture: (17179 869184.0G )
✔ InnoDB buffer pool / data size: 8.0G / 5.9G
✔ Ratio InnoDB log file size / InnoDB Buffer pool size: 2.0G * 1/8.0G should be equal to 25%
✘ Cannot calculate InnoDB Buffer Pool Chunk breakdown due to missing or zero va lues:
ℹ - innodb_buffer_pool_size: 8589934592
ℹ - innodb_buffer_pool_chunk_size: 0
ℹ - innodb_buffer_pool_instances: 1
✔ InnoDB Read buffer efficiency: 99.87% (12173784774 hits / 12189155224 total)
✔ InnoDB Write Log efficiency: 92.92% (303142748 hits / 326236065 total)
✔ InnoDB log waits: 0.00% (0 waits / 23093317 writes)
-------- Aria Metrics ---------------------------------------------------------- --------------------
ℹ Aria Storage Engine is enabled.
✔ Aria pagecache size / total Aria indexes: 2.0G/0B
✔ Aria pagecache hit rate: 99.5% (70M cached / 376K reads)
-------- TokuDB Metrics -------------------------------------------------------- --------------------
ℹ TokuDB is disabled.
-------- XtraDB Metrics -------------------------------------------------------- --------------------
ℹ XtraDB is disabled.
-------- Galera Metrics -------------------------------------------------------- --------------------
ℹ Galera is disabled.
-------- Replication Metrics --------------------------------------------------- --------------------
ℹ Galera Synchronous replication: NO
ℹ No replication slave(s) for this server.
ℹ Binlog format: MIXED
ℹ XA support enabled: ON
ℹ Semi synchronous replication Master: OFF
ℹ Semi synchronous replication Slave: OFF
ℹ This is a standalone server
-------- Recommendations ------------------------------------------------------- --------------------
General recommendations:
Configure your accounts with ip or subnets only, then update your configurat ion with skip-name-resolve=ON
We will suggest raising the 'join_buffer_size' until JOINs not using indexes are found.
See https://dev.mysql.com/doc/refman/8.0/en/server-system-variables .html#sysvar_join_buffer_size
Performance schema should be activated for better diagnostics
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 t his: https://bit.ly/2TcGgtU
Variables to adjust:
skip-name-resolve=ON
join_buffer_size (> 4.0M, or always use indexes with JOINs)
performance_schema=ON
thanks and sorry for my bad english
Sam