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https://github.com/magenx/magento-mysql

Magento default mysql settings
https://github.com/magenx/magento-mysql

magento mysql percona

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Magento default mysql settings

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magento-mysql

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Magento default mysql settings

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>default/startup settings for mysql database.


>please read this before changing anything!



    GENERAL OPTIONS



1. **max_connections**


 *How many connections to allow. Watch* **max_used_connections** *value*



2. **thread_cache**


 *Cache to prevent excessive thread creation*


 *50-100 is good value. Watch* **threads_created**



3. **table_cache/table_open_cache**


 *Cache of opened table instances*


 *Single table may have multiple entries*


 *Watch* **opened_tables** *status value*


 *Start with 4096*



4. **open_files_limit**


 *MyISAM tables require up to 2 file handlers*
 

 *Each connection is file handler too*


 *Safe to set to 65535 in most systems*



5. **table_definition_cache**


 *Cache table definitions (CREATE TABLE)*


 *Only one entry  per table*


 *Watch* **Opened_table_definitions**


 *Set to number of tables + 10% unless 50K+ tables*



6. **back_log**


 *Need adjustment if many connections/sec*


 *2048 is reasonable value*



7. **max_allowed_packet**


 *Limits maximum size of query*
 

 *Limits internal string variable size*
 

 *16MB is a good value*



8. **max_connect_errors**


 *Prevent password brute force attack*


 *Can cause "Host Blocked" error messages*


 *Value around 1000000 is good*



9. **skip_name_resolve**


 *Avoid DNS lookup on connection. Faster and Safer*


 *Do not use host names in GRANTs*



10. **old_passwords**


 *Should NOT be enabled. Will cause insecure password hash to be used.*



11. **log_bin**


 *Enable for replication and point in time recovery*


 *Set to mysql-bin to avoid default naming*



12. **sync_binlog**


 *Make Binlog durable.  Set to 1 if have RAID with BBU or Flash*


 *Can be really performance killer with slow drives.*



13. **expire_log_days**


 *Purge old binary logs after this number of days*


 *14 (2 weeks) is a good value with weekly backups*



14. **tmp_table_size**


15. **max_heap_table_size**


 *Typically set to same value (workload based)*


 **Created_tmp_disk_tables** *status variable*
 

 *Beware BLOB/TEXT fields cause on disk table with any size.*



16. **query_cache_size**


 *Enable query cache only if it is tested to provide significant gains*


 *Often causes stalls and contention*


 *Do not set over 512M*



17. **sort_buffer_size**


 *In memory buffer used for sorting*


 *Watch* **sort_merge_passes**


 *Consider setting for session for large queries*


 *Values up to 1MB are good default*


 *Large values hurt performance of small queries*



18. **join_buffer_size**


 *Helps performance of Joins with no indexes*


 *Better get rid of such Joins*
 

 *8MB can be reasonable value*



19. **default_storage_engine**


 *Use Innodb engine for tables if not specified*



20. **read_rnd_buffer_size**


 *Buffer for reading rows in sorted offer*


 *Specifies Maximum Value*


 *Values around 16MB often make sense*


 *Do not mix with* **read_buffer_size**



21. **Tmpdir**


 *Specify location of temporary directory*


 *Tmpfs often good choice unless very large temporary space is needed.*


 *tmpdir=/dev/shm*



		MyISAM OPTIONS



1. **key_buffer_size**


 *Cache MyISAM Indexes.*
 

 *Does Not cache data.*


 *Up to 30% of memory if using MyISAM only*



2. **myisam_recover**


 *Automatically repair corrupted MyISAM tables after crash.* **BACKUP,FORCE** *is a good value.*



3. **myisam_sort_buffer_size**


 *Buffer used for building MyISAM indexes by Sort. 8MB-256MB are good values*



4. **low_priority_updates**


 *Allow higher concurrency for SELECTs*


 *May starve update queries*



5. **bulk_insert_buffer_size**


 *Buffer to optimize Bulk Inserts*


 *Values of 1/4 of* **key_buffer_size** *make sense*


 *Note it is per connection value*



		INNODB MEMORY SETTINGS



1. **innodb_buffer_pool_size**


 *The most important setting. Often 80%+ of memory is allocated here.*



2. **innodb_buffer_pool_instances**


 *Reduce contention.  Set to 4+ in MySQL 5.5+*



3. **innodb_log_buffer_size**


 *Buffer for log files.  Good Values 4MB-128MB*


 *Not only reduce writes but help contention*
 



4. **innodb_ibuf_max_size**


 *Control size of Insert buffer. Default is 1/2 of Buffer pool. Smaller values are good for SSD*



		INNODB IO OPTIONS



1. **innodb_flush_log_at_trx_commit**


 *Control Durability*


 *1=flush and sync;  2=flush;  0=neither*



2. **Innodb_flush_method**


 *Controls how Innodb Performs IO*


 **O_DIRECT** *good value for most servers*



3. **innodb_auto_lru_dump**


 *Percona Server Feature to warmup quickly*


 *300 (seconds) is a good value*



4. **innodb_io_capacity**


 *Controls Innodb Assumption about Disk Performance. Increase for faster drives*



4. **innodb_read_io_threads**


5. **innodb_write_io_threads**


 *Control number of threads doing reads and writes*


 *MySQL 5.5 has async IO so very high values might not be needed*


 *4 is good default. Higher for large IO systems.*



6. **innodb_flush_neighbor_pages**


 *Percona Server feature to control how flushing works*


 *Disable (set to 0) for SSD*



		OTHER INNODB OPTIONS



1. **innodb_log_file_size**


 *Size of redo log file. Larger logs better performance but longer recovery.*
 



2. **innodb_log_files_in_group**


 *Leave at 2 which is default.*



3. **innodb_file_per_table**


 *Store each Innodb table in separate file. Usually Good choice*



4. **innodb=force**


 *Enable so MySQL does not start if Innodb could not initialize.*
 

 *Otherwise it might start but error on access to all Innodb tables.*



5. **innodb_lock_wait_timeout**


 *How long to wait for row level locks before bailing out*



6. **innodb_old_blocks_time**


 *Helps to make buffer pool scan resistant*


 *Values around 1000 make sense*



7. **innodb_file_format**


 *Which file format Innodb will use*


 *Antelope is default legacy format*


 *Barracuda allows to use new features like compression*



8. **innodb_stats_on_metadata**


 *Update statistics on meta data access*


 *Such as Information_schema queries*


 *Typically best disabled for more workloads Set to 0*


 *Innodb will still refresh stats when table changes significantly*



9. **performance_schema**


 *Enable Performance Schema in MySQL 5.5+*


 *Watch potential overhead.*
 



10. **log_slow_queries**


 *Enable Slow Query Log. Old but very helpful.*



11. **long_query_time**


 *Especially with* **long_query_time** *set to 0 periodically to get sample of the load*



12. **log_slow_verbosity=full**


 *Get a lot more data about queries in Percona Server*



13. **low_warnings=2**


 *Get warnings about disconnects and other minor issues in error log.*


 *More information but it can get spammy*



14. **userstat_running=1**


 *Get advanced Table and Index usage statistics in Percona Server and MariaDB*