檢查慢查日志是否開(kāi)啟：

show variables like 'slow_query_log'

show variables like 'slow_query_log' //查看是否開(kāi)啟慢查詢?nèi)罩緎et global slow_query_log_file=' /usr/share/mysql/sql_log/mysql-slow.log' //慢查詢?nèi)罩镜奈恢胹et global log_queries_not_using_indexes=on; //開(kāi)啟慢查詢?nèi)罩緎et global long_query_time=1; //大于1秒鐘的數(shù)據(jù)記錄到慢日志中，如果設(shè)置為默認(rèn)0，則會(huì)有大量的信息存儲(chǔ)在磁盤中，磁盤很容易滿掉

查看所有日志的變量信息

show variables like '%log%' mysql> show variables like '%log%'; +-----------------------------------------+------------------------------------+ | Variable_name | Value | +-----------------------------------------+------------------------------------+ | back_log | 80 | | binlog_cache_size | 32768 | | binlog_checksum | CRC32 | | binlog_direct_non_transactional_updates | OFF | | binlog_error_action | IGNORE_ERROR | | binlog_format | STATEMENT | | binlog_gtid_simple_recovery | OFF | | binlog_max_flush_queue_time | 0 | | binlog_order_commits | ON | | binlog_row_image | FULL | | binlog_rows_query_log_events | OFF | | binlog_stmt_cache_size | 32768 | | binlogging_impossible_mode | IGNORE_ERROR | | expire_logs_days | 0 | | general_log | OFF | | general_log_file | /var/lib/mysql/mysql-host.log | | innodb_api_enable_binlog | OFF | | innodb_flush_log_at_timeout | 1 | | innodb_flush_log_at_trx_commit | 1 | | innodb_locks_unsafe_for_binlog | OFF | | innodb_log_buffer_size | 8388608 | | innodb_log_compressed_pages | ON | | innodb_log_file_size | 50331648 | | innodb_log_files_in_group | 2 | | innodb_log_group_home_dir | ./ | | innodb_mirrored_log_groups | 1 | | innodb_online_alter_log_max_size | 134217728 | | innodb_undo_logs | 128 | | log_bin | OFF | | log_bin_basename | | | log_bin_index | | | log_bin_trust_function_creators | OFF | | log_bin_use_v1_row_events | OFF | | log_error | /var/log/mysqld.log | | log_output | FILE | | log_queries_not_using_indexes | ON | | log_slave_updates | OFF | | log_slow_admin_statements | OFF | | log_slow_slave_statements | OFF | | log_throttle_queries_not_using_indexes | 0 | | log_warnings | 1 | | max_binlog_cache_size | 18446744073709547520 | | max_binlog_size | 1073741824 | | max_binlog_stmt_cache_size | 18446744073709547520 | | max_relay_log_size | 0 | | relay_log | | | relay_log_basename | | | relay_log_index | | | relay_log_info_file | relay-log.info | | relay_log_info_repository | FILE | | relay_log_purge | ON | | relay_log_recovery | OFF | | relay_log_space_limit | 0 | | simplified_binlog_gtid_recovery | OFF | | slow_query_log | OFF | | slow_query_log_file | /var/lib/mysql/mysql-host-slow.log | | sql_log_bin | ON | | sql_log_off | OFF | | sync_binlog | 0 | | sync_relay_log | 10000 | | sync_relay_log_info | 10000 | +-----------------------------------------+-----------------------------------

開(kāi)啟慢查日志：

show variables like 'slow_query_log' //查看是否開(kāi)啟慢查詢?nèi)罩緎et global slow_query_log_file=' /var/lib/mysql/mysql-host-slow.log ' //慢查詢?nèi)罩镜奈恢胹et global log_queries_not_using_indexes=on; //開(kāi)啟慢查詢?nèi)罩緎et global long_query_time=1; //大于1秒鐘的數(shù)據(jù)記錄到慢日志中，如果設(shè)置為默認(rèn)0，則會(huì)有大量的信息存儲(chǔ)在磁盤中，磁盤很容易滿掉

驗(yàn)證慢查詢?nèi)罩臼欠耖_(kāi)啟：

在mysql操作中，

Show databases; Use sakila; select * from store; select * from staff; 監(jiān)聽(tīng)日志文件，看是否寫入 tail -50f /var/lib/mysql/mysql-host-slow.log

總結(jié)

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