mariadb數據庫優化需要根據自己業務需求以及根據硬件配置來進行參數優化，下面是一些關於mariadb數據庫參數優化的配置文件。
如下爲128G內存32線程處理器的mariadb配置參數優化：
[client] #password= your_password port= 3306 socket= /tmp/mysql.sock !includedir /opt/local/mysql/wsrep # The MySQL server [mysqld] port= 3306 socket= /tmp/mysql.sock basedir = /opt/local/mysql datadir=/opt/local/mysql/data #數據庫存放目錄 relay-log=/opt/local/mysql/relaylog/s74-relay-bin pid-file = /opt/local/mysql/mysql.pid log-error = /opt/local/mysql/logs/mysqld.log open_files_limit = 65535 # #skip-locking skip-external-locking #跳過外部鎖定 back_log=3000 #暫存的連接數量 skip-name-resolve #關閉mysql的dns反查功能 memlock #將mysqld 進程鎖定在內存中 lower_case_table_names = 1 #query_response_time_stats=1 #core-file #core-file-size = unlimited query_cache_type=1 #查詢緩存 (0 = off、1 = on、2 = demand) performance_schema=0 #收集數據庫服務器性能參數 net_read_timeout=3600 #連接繁忙階段（query）起作用 net_write_timeout=3600 #連接繁忙階段（query）起作用 key_buffer_size = 32M #設置索引塊緩存大小 max_allowed_packet = 128M #通信緩衝大小 table_open_cache = 1024 #table高速緩存的數量 sort_buffer_size = 12M #每個connection（session）第一次需要使用這個buffer的時候，一次性分配設置的內存 read_buffer_size = 8M #順序讀取數據緩衝區使用內存 #sort_buffer_size = 32M #read_buffer_size = 32M read_rnd_buffer_size = 32M #隨機讀取數據緩衝區使用內存 myisam_sort_buffer_size = 32M #MyISAM表發生變化時重新排序所需的緩衝 thread_cache_size = 120 #重新利用保存在緩存中線程的數量 query_cache_size = 64M join_buffer_size = 8M #Join操作使用內存 bulk_insert_buffer_size = 32M #批量插入數據緩存大小 delay_key_write=ON #在表關閉之前，將對錶的update操作指跟新數據到磁盤，而不更新索引到磁盤，把對索引的更改記錄在內存。這樣MyISAM表可以使索引更新更快。在關閉表的時候一起更新索引到磁盤 delayed_insert_limit=4000 delayed_insert_timeout=600 delayed_queue_size=4000 # Try number of CPU's*2 for thread_concurrency # The variable only affects Solaris! thread_concurrency = 64 #CPU核數 * 2 max_connections=1500 #最大連接（用戶）數。每個連接MySQL的用戶均算作一個連接 max_connect_errors=30 #最大失敗連接限制 interactive_timeout=600 #服務器關閉交互式連接前等待活動的秒數 wait_timeout=3600 #服務器關閉非交互連接之前等待活動的秒數 slow_query_log #慢查詢記錄日誌 long_query_time = 0.1 #慢查詢記錄時間 0.1秒 slow_query_log_file=/opt/local/mysql/logs/slow_query.log #慢查詢日誌路徑 #log_slow_verbosity=full log_slow_verbosity=query_plan # # Replication Master Server (default) # binary logging is required for replication log-bin=/opt/local/mysql/binlog/mysql-bin #binlog 名稱 log-slave-updates #從master取得並執行的二進制日誌寫入自己的二進制日誌文件中 replicate-ignore-db=mysql #不同步的表 # binary logging format - mixed recommended binlog_format=row #binlog 格式 分別爲 row=行格式 丶 mixed=混合格式 丶 STATEMENT=SQL語句複製模式 event_scheduler=1 #計劃任務 事件調度器 # required unique id between 1 and 2^32 - 1 # defaults to 1 if master-host is not set # but will not function as a master if omitted server-id= 1 # # Point the following paths to different dedicated disks #tmpdir= /tmp/ #log-update = /path-to-dedicated-directory/hostname # Uncomment the following if you are using InnoDB tables #innodb_data_home_dir = /data/mysql-5.1.48/mysql-data/ #innodb_data_file_path = ibdata1:2000M;ibdata2:10M:autoextend #innodb_log_group_home_dir = /data/mysql-5.1.48/mysql-data/ # You can set .._buffer_pool_size up to 50 - 80 % # of RAM but beware of setting memory usage too high innodb_file_format=barracuda innodb_file_format_max=barracuda innodb_file_per_table=1 innodb_fast_shutdown=0 innodb_buffer_pool_size = 90000M innodb_buffer_pool_instances = 4 #innodb_additional_mem_pool_size = 20M #innodb_use_sys_malloc = 20M # Set .._log_file_size to 25 % of buffer pool size innodb_log_file_size = 512M #innodb_log_buffer_size = 8M innodb_log_files_in_group = 3 innodb_flush_log_at_trx_commit = 2 innodb_lock_wait_timeout = 3 innodb_rollback_on_timeout = on innodb_flush_method=O_DIRECT transaction-isolation=READ-COMMITTED innodb_thread_concurrency=0 innodb_io_capacity=800 innodb_purge_threads=1 innodb_open_files=65535 #innodb_stats_update_need_lock=0 #innodb_flush_neighbor_pages=0 #innodb_aio_pending_ios_per_thread=256 #for binlog_format=row innodb_autoinc_lock_mode=2 #innodb_fast_checksum = 1 innodb_read_io_threads = 8 innodb_write_io_threads = 12 innodb_stats_on_metadata = 0 #使用線程池處理連接 thread_handling=pool-of-threads thread_pool_oversubscribe=30 thread_pool_size=64 thread_pool_idle_timeout=7200 thread_pool_max_threads=2000 #查詢優化器開關 #optimizer_switch='index_condition_pushdown=on' #optimizer_switch='mrr=on' #optimizer_switch='mrr_sort_keys=on' #optimizer_switch='mrr_cost_based=off' #mrr_buffer_size=32M #optimizer_switch='join_cache_incremental=on' #optimizer_switch='join_cache_hashed=on' #optimizer_switch='join_cache_bka=on' #join_cache_level=4 #join_buffer_size=32M #join_buffer_space_limit=32M [mysqldump] quick max_allowed_packet = 16M [mysql] no-auto-rehash # Remove the next comment character if you are not familiar with SQL #safe-updates [myisamchk] key_buffer_size = 256M sort_buffer_size = 256M read_buffer = 2M write_buffer = 2M [isamchk] key_buffer_size = 256M sort_buffer_size = 256M read_buffer = 2M write_buffer = 2M [mysqlhotcopy] interactive-timeout
如下爲256G內存64線程處理器的mariadb配置參數優化：
[client] #password= your_password port= 3306 socket= /tmp/mysql.sock !includedir /opt/local/mysql/wsrep # The MySQL server [mysqld] port= 3306 socket= /tmp/mysql.sock basedir = /opt/local/mysql datadir=/opt/local/mysql/data #數據庫存放目錄 relay-log=/opt/local/mysql/relaylog/s74-relay-bin pid-file = /opt/local/mysql/mysql.pid log-error = /opt/local/mysql/logs/mysqld.log open_files_limit = 65535 # #skip-locking skip-external-locking #跳過外部鎖定 back_log=3000 #暫存的連接數量 skip-name-resolve #關閉mysql的dns反查功能 memlock #將mysqld 進程鎖定在內存中 lower_case_table_names = 1 #query_response_time_stats=1 #core-file #core-file-size = unlimited query_cache_type=1 #查詢緩存 (0 = off、1 = on、2 = demand) performance_schema=0 #收集數據庫服務器性能參數 net_read_timeout=3600 #連接繁忙階段（query）起作用 net_write_timeout=3600 #連接繁忙階段（query）起作用 key_buffer_size = 32M #設置索引塊緩存大小 max_allowed_packet = 128M #通信緩衝大小 table_open_cache = 1024 #table高速緩存的數量 sort_buffer_size = 12M #每個connection（session）第一次需要使用這個buffer的時候，一次性分配設置的內存 read_buffer_size = 8M #順序讀取數據緩衝區使用內存 #sort_buffer_size = 32M #read_buffer_size = 32M read_rnd_buffer_size = 32M #隨機讀取數據緩衝區使用內存 myisam_sort_buffer_size = 32M #MyISAM表發生變化時重新排序所需的緩衝 thread_cache_size = 120 #重新利用保存在緩存中線程的數量 query_cache_size = 64M join_buffer_size = 8M #Join操作使用內存 bulk_insert_buffer_size = 32M #批量插入數據緩存大小 delay_key_write=ON #在表關閉之前，將對錶的update操作指跟新數據到磁盤，而不更新索引到磁盤，把對索引的更改記錄在內存。這樣MyISAM表可以使索引更新更快。在關閉表的時候一起更新索引到磁盤 delayed_insert_limit=4000 delayed_insert_timeout=600 delayed_queue_size=4000 # Try number of CPU's*2 for thread_concurrency # The variable only affects Solaris! thread_concurrency = 96 #CPU核數 * 2 max_connections=1500 #最大連接（用戶）數。每個連接MySQL的用戶均算作一個連接 max_connect_errors=30 #最大失敗連接限制 interactive_timeout=600 #服務器關閉交互式連接前等待活動的秒數 wait_timeout=3600 #服務器關閉非交互連接之前等待活動的秒數 slow_query_log #慢查詢記錄日誌 long_query_time = 0.1 #慢查詢記錄時間 0.1秒 slow_query_log_file=/opt/local/mysql/logs/slow_query.log #慢查詢日誌路徑 #log_slow_verbosity=full log_slow_verbosity=query_plan # # Replication Master Server (default) # binary logging is required for replication log-bin=/opt/local/mysql/binlog/mysql-bin #binlog 名稱 log-slave-updates #從master取得並執行的二進制日誌寫入自己的二進制日誌文件中 replicate-ignore-db=mysql #不同步的表 # binary logging format - mixed recommended binlog_format=row #binlog 格式 分別爲 row=行格式 丶 mixed=混合格式 丶 STATEMENT=SQL語句複製模式 event_scheduler=1 #計劃任務 事件調度器 # required unique id between 1 and 2^32 - 1 # defaults to 1 if master-host is not set # but will not function as a master if omitted server-id= 1 # # Point the following paths to different dedicated disks #tmpdir= /tmp/ #log-update = /path-to-dedicated-directory/hostname # Uncomment the following if you are using InnoDB tables #innodb_data_home_dir = /data/mysql-5.1.48/mysql-data/ #innodb_data_file_path = ibdata1:2000M;ibdata2:10M:autoextend #innodb_log_group_home_dir = /data/mysql-5.1.48/mysql-data/ # You can set .._buffer_pool_size up to 50 - 80 % # of RAM but beware of setting memory usage too high innodb_file_format=barracuda innodb_file_format_max=barracuda innodb_file_per_table=1 innodb_fast_shutdown=0 innodb_buffer_pool_size = 180000M innodb_buffer_pool_instances = 4 #innodb_additional_mem_pool_size = 20M #innodb_use_sys_malloc = 20M # Set .._log_file_size to 25 % of buffer pool size innodb_log_file_size = 512M #innodb_log_buffer_size = 8M innodb_log_files_in_group = 3 innodb_flush_log_at_trx_commit = 2 innodb_lock_wait_timeout = 3 innodb_rollback_on_timeout = on innodb_flush_method=O_DIRECT transaction-isolation=READ-COMMITTED innodb_thread_concurrency=0 innodb_io_capacity=800 innodb_purge_threads=1 innodb_open_files=65535 #innodb_stats_update_need_lock=0 #innodb_flush_neighbor_pages=0 #innodb_aio_pending_ios_per_thread=256 #for binlog_format=row innodb_autoinc_lock_mode=2 #innodb_fast_checksum = 1 innodb_read_io_threads = 8 innodb_write_io_threads = 12 innodb_stats_on_metadata = 0 #使用線程池處理連接 thread_handling=pool-of-threads thread_pool_oversubscribe=30 thread_pool_size=64 thread_pool_idle_timeout=7200 thread_pool_max_threads=2000 #查詢優化器開關 #optimizer_switch='index_condition_pushdown=on' #optimizer_switch='mrr=on' #optimizer_switch='mrr_sort_keys=on' #optimizer_switch='mrr_cost_based=off' #mrr_buffer_size=32M #optimizer_switch='join_cache_incremental=on' #optimizer_switch='join_cache_hashed=on' #optimizer_switch='join_cache_bka=on' #join_cache_level=4 #join_buffer_size=32M #join_buffer_space_limit=32M [mysqldump] quick max_allowed_packet = 16M [mysql] no-auto-rehash # Remove the next comment character if you are not familiar with SQL #safe-updates [myisamchk] key_buffer_size = 256M sort_buffer_size = 256M read_buffer = 2M write_buffer = 2M [isamchk] key_buffer_size = 256M sort_buffer_size = 256M read_buffer = 2M write_buffer = 2M [mysqlhotcopy] interactive-timeout