81 lines
3.4 KiB
Plaintext
81 lines
3.4 KiB
Plaintext
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[mysqld]
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max_allowed_packet = 16M
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# Sort buffer is used to perform sorts for some ORDER BY and GROUP BY
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# queries. If sorted data does not fit into the sort buffer, a disk
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# based merge sort is used instead - See the "Sort_merge_passes"
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# status variable. Allocated per thread if sort is needed.
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# Comment out for now, the default in MariaDB 10.2 is 2M
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#sort_buffer_size = 1M
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# Size of the buffer used for doing full table scans.
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# Allocated per thread, if a full scan is needed.
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read_buffer_size = 1M
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# When reading rows in sorted order after a sort, the rows are read
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# through this buffer to avoid disk seeks. You can improve ORDER BY
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# performance a lot, if set this to a high value.
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# Allocated per thread, when needed.
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read_rnd_buffer_size = 8M
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join_buffer_size = 8M # should be equal to read_rnd_buffer_size?
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# Maximum allowed size for a single HEAP (in memory) table. This option
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# is a protection against the accidential creation of a very large HEAP
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# table which could otherwise use up all memory resources.
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max_heap_table_size = 64M
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tmp_table_size = 64M # Should be equal to max_heap_table_size
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## Generally, it is unwise to set the query cache to be larger than 64-128M
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## as the costs associated with maintaining the cache outweigh the performance
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## gains.
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## The query cache is a well known bottleneck that can be seen even when
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## concurrency is moderate. The best option is to disable it from day 1
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## by setting query_cache_size = 0 (now the default on MySQL 5.6)
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## and to use other ways to speed up read queries: good indexing, adding
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## replicas to spread the read load or using an external cache.
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query_cache_type = on
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query_cache_size = 32M
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query_cache_strip_comments = on
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query_cache_min_res_unit = 2K
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# query_cache_limit = 256K # Default is 1M now
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thread_cache_size = 16
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table_open_cache = 4096
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table_definition_cache = 1024
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#
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# InnoDB
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#
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# The buffer pool is where data and indexes are cached: having it as large as possible
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# will ensure you use memory and not disks for most read operations.
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# Typical values are 50..75% of available RAM.
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innodb_buffer_pool_size = 768M # 75% of 1GB RAM
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innodb_log_file_size = 192M # 25% of innodb_buffer_pool_size
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innodb_flush_method = O_DIRECT
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# This setting should be set to 0 (disabled) on SSDs which do not have
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# any performance gains with sequential IO.
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innodb_flush_neighbors = 0
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# The default setting of 1 means that InnoDB is fully ACID compliant.
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# It is the best value when your primary concern is data safety, for instance on a master.
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# However it can have a significant overhead on systems with slow disks because of the
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# extra fsyncs that are needed to flush each change to the redo logs.
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# Setting it to 2 is a bit less reliable because committed transactions will be
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# flushed to the redo logs only once a second, but that can be acceptable on some situations
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# for a master and that is definitely a good value for a replica. 0 is even faster
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# but you are more likely to lose some data in case of a crash: it is only a good value for a replica.
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innodb_flush_log_at_trx_commit = 0
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# Conquer an InnoDB crash with `InnoDB: A long semaphore wait` error
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# See http://stackoverflow.com/questions/24860111/warning-a-long-semaphore-wait
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# See http://www.markleith.co.uk/2009/05/13/innodb_stats_on_metadata-innodb_adaptive_hash_index/
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innodb_adaptive_hash_index = off
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# Kill iddle connections after 10min
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wait_timeout = 600
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[mysqldump]
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max-allowed-packet = 16M
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