DDD

Sortida del mysqltuner d'ara mateix:

$ mysqltuner --skippassword                        
 >>  MySQLTuner 1.7.13 - 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            
[!!] failed to execute: SHOW SLAVE STATUS\G                 
[!!] FAIL Execute SQL / return code: 256                                                                                             
[!!] failed to execute: SHOW SLAVE HOSTS                                                                                             
[!!] FAIL Execute SQL / return code: 256                                                                                             
[OK] Currently running supported MySQL version 10.3.25-MariaDB-0+deb10u1 
[OK] Operating on 64-bit architecture                          

-------- Log file Recommendations ------------------------------------------------------------------
[--] Log file: /var/log/mysql/error.log(619B)                                                                                        
[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 4 warning(s).
[!!] /var/log/mysql/error.log contains 3 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: +Aria +CSV +InnoDB +MEMORY +MRG_MyISAM +MyISAM +PERFORMANCE_SCHEMA +SEQUENCE 
[--] Data in MyISAM tables: 38.9G (Tables: 533)
[!!] InnoDB is enabled but isn't being used
[!!] Total fragmented tables: 1                                   

-------- Analysis Performance Metrics --------------------------------------------------------------
[--] innodb_stats_on_metadata: OFF
[OK] No stat updates during querying INFORMATION_SCHEMA.

-------- Security Recommendations ------------------------------------------------------------------
[--] Skipped due to --skippassword option

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

-------- Performance Metrics -----------------------------------------------------------------------
[--] Up for: 11d 7h 10m 47s (1B q [1K qps], 227K conn, TX: 1386G, RX: 107G)
[--] Reads / Writes: 96% / 4%
[--] Binary logging is disabled
[--] Physical Memory     : 31.3G
[--] Max MySQL memory    : 10.7G
[--] Other process memory: 5.3G
[--] Total buffers: 10.6G global + 2.9M per thread (50 max threads)
[--] P_S Max memory usage: 0B
[--] Galera GCache Max memory usage: 0B
[OK] Maximum reached memory usage: 10.7G (34.27% of installed RAM)
[OK] Maximum possible memory usage: 10.7G (34.26% of installed RAM)
[OK] Overall possible memory usage with other process is compatible with memory available
[OK] Slow queries: 0% (43K/1B)
[!!] Highest connection usage: 100%  (51/50)
[!!] Aborted connections: 17.17%  (39030/227366)
[!!] 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: 38.7% (539M cached / 1B selects)
[!!] Query cache prunes per day: 16663627
[OK] Sorts requiring temporary tables: 0% (5 temp sorts / 85M sorts)
[OK] No joins without indexes
[!!] Temporary tables created on disk: 27% (75M on disk / 274M total)
[OK] Thread cache hit rate: 99% (734 created / 227K connections)
[OK] Table cache hit rate: 93% (2K open / 2K opened)
[OK] Open file limit used: 22% (3K/16K)
[OK] Table locks acquired immediately: 99% (474M immediate / 474M 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: 40 thread(s).
[--] Using default value is good enough for your version (10.3.25-MariaDB-0+deb10u1)

-------- MyISAM Metrics ----------------------------------------------------------------------------
[!!] Key buffer used: 63.2% (6B used / 10B cache)
[OK] Key buffer size / total MyISAM indexes: 10.0G/9.9G
[OK] Read Key buffer hit rate: 100.0% (52B cached / 4M reads)
[!!] Write Key buffer hit rate: 64.6% (43M cached / 27M writes)

-------- InnoDB Metrics ----------------------------------------------------------------------------
[--] InnoDB is disabled.
[!!] InnoDB Storage engine is disabled. InnoDB is the default storage engine

-------- AriaDB Metrics ----------------------------------------------------------------------------
[--] AriaDB is enabled.
[OK] Aria pagecache size / total Aria indexes: 128.0M/1B
[!!] Aria pagecache hit rate: 76.0% (315M cached / 75M 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/log/mysql/error.log file
    Control error line(s) into /var/log/mysql/error.log file
    Add skip-innodb to MySQL configuration to disable InnoDB
    Run OPTIMIZE TABLE to defragment tables for better performance
      OPTIMIZE TABLE `ddduab`.`rnkWORD01R`; -- can free 17.620906829834 MB
    Total freed space after theses OPTIMIZE TABLE : 17.620906829834 Mb
    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
    Increasing the query_cache size over 128M may reduce performance
    When making adjustments, make tmp_table_size/max_heap_table_size equal
    Reduce your SELECT DISTINCT queries which have no LIMIT clause
    Performance schema should be activated for better diagnostics
    Consider installing Sys schema from https://github.com/mysql/mysql-sys
Variables to adjust:
    max_connections (> 50)
    wait_timeout (< 28800)
    interactive_timeout (< 28800)
    query_cache_size (=0)
    query_cache_type (=0)
    query_cache_size (> 256M) [see warning above]
    tmp_table_size (> 64M)
    max_heap_table_size (> 512M)
    performance_schema = ON enable PFS

Sortida del tuning-primer.sh:

 -- MYSQL PERFORMANCE TUNING PRIMER --
      - By: Matthew Montgomery -

MySQL Version 10.3.25-MariaDB-0+deb10u1 x86_64

Uptime = 11 days 7 hrs 13 min 11 sec
Avg. qps = 1103                                                   
Total Questions = 1077690521                                      
Threads Connected = 32                                                                                                               

Server has been running for over 48hrs.                                                                                              
It should be safe to follow these recommendations

To find out more information on how each of these
runtime variables effects performance visit:
http://dev.mysql.com/doc/refman/10.3/en/server-system-variables.html
Visit http://www.mysql.com/products/enterprise/advisors.html
for info about MySQL's Enterprise Monitoring and Advisory Service

SLOW QUERIES
The slow query log is NOT enabled.

BINARY UPDATE LOG
The binary update log is NOT enabled.
You will not be able to do point in time recovery
See http://dev.mysql.com/doc/refman/10.3/en/point-in-time-recovery.html

WORKER THREADS
Current thread_cache_size = 50
Current threads_cached = 3
Current threads_per_sec = 0
Historic threads_per_sec = 0
Your thread_cache_size is fine

MAX CONNECTIONS
Current max_connections = 50
Current threads_connected = 32
Historic max_used_connections = 51
The number of used connections is 102% of the configured maximum.
You should raise max_connections

INNODB STATUS
Current InnoDB index space = 0 bytes
Current InnoDB data space = 0 bytes
Current InnoDB buffer pool free = 96 %
Current innodb_buffer_pool_size = 128 M
Depending on how much space your innodb indexes take up it may be safe
to increase this value to up to 2 / 3 of total system memory

MEMORY USAGE
Max Memory Ever Allocated : 10.53 G
Configured Max Per-thread Buffers : 145 M
Configured Max Global Buffers : 10.39 G
Configured Max Memory Limit : 10.53 G
Physical Memory : 31.28 G
Max memory limit seem to be within acceptable norms

KEY BUFFER
Current MyISAM index space = 9.93 G
Current key_buffer_size = 10.00 G
Key cache miss rate is 1 : 11783
Key buffer free ratio = 36 %
Your key_buffer_size seems to be too high.
Perhaps you can use these resources elsewhere

QUERY CACHE
Query cache is enabled
Current query_cache_size = 256 M
Current query_cache_used = 160 M
Current query_cache_limit = 1 M
Current Query cache Memory fill ratio = 62.56 %
Current query_cache_min_res_unit = 4 K
MySQL won't cache query results that are larger than query_cache_limit in size

SORT OPERATIONS
Current sort_buffer_size = 2 M
Current read_rnd_buffer_size = 256 K
Sort buffer seems to be fine

JOINS
Current join_buffer_size = 260.00 K
You have had 1698 queries where a join could not use an index properly
You should enable "log-queries-not-using-indexes" 
Then look for non indexed joins in the slow query log.
If you are unable to optimize your queries you may want to increase your
join_buffer_size to accommodate larger joins in one pass.

Note! This script will still suggest raising the join_buffer_size when
ANY joins not using indexes are found.

OPEN FILES LIMIT
Current open_files_limit = 16384 files
The open_files_limit should typically be set to at least 2x-3x
that of table_cache if you have heavy MyISAM usage.
Your open_files_limit value seems to be fine

TABLE CACHE
Current table_open_cache = 6000 tables
Current table_definition_cache = 1600 tables
You have a total of 533 tables
You have 2201 open tables.
The table_cache value seems to be fine

TEMP TABLES
Current max_heap_table_size = 512 M
Current tmp_table_size = 64 M
Of 274360208 temp tables, 21% were created on disk
Created disk tmp tables ratio seems fine

TABLE SCANS
Current read_buffer_size = 128 K
Current table scan ratio = 12 : 1
read_buffer_size seems to be fine

TABLE LOCKING
Current Lock Wait ratio = 1 : 2773
You may benefit from selective use of InnoDB.
If you have long running SELECT's against MyISAM tables and perform
frequent updates consider setting 'low_priority_updates=1'
If you have a high concurrency of inserts on Dynamic row-length tables
consider setting 'concurrent_insert=ALWAYS'.