浅析MySQL 7种日志_MySQL
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浅析MySQL 7种日志
㈠ 错误日志
① 参数
log_error：指定日志的位置和名称
② 作用
⑴出错/告警信息
⑵优化帮助
㈡ 慢查询日志
① 参数
log_slow_queries：指定日志的位置和名字
long_query_time：运行时间小于等于该阈值的SQL不会被记录
log_queries_not_using_indexes：没有使用索引的SQL会被记录
log_output：指定日志的输出格式、默认是FILE、亦可另置为TABLE
② 作用
SQL优化
㈢ 事务日志
① 参数
innodb_log_file_size：日志文件大小
innodb_log_files_in_group：每组有多少日志文件
innodb_mirrored_log_groups：有多少组
innodb_log_group_home_dir：日志组所在路径
② 作用
实例或介质恢复
㈣ 中继日志
① 参数
relay-log：指定中继日志的位置和名字
② 作用
备库将主库的日志复制到自己的中继日志里
㈤ 通用日志
① 参数
general_log_file：指定通用日志的位置和名字
general_log：1开启；0关闭
② 作用
审计：哪个账号、在哪个时段、做了哪些事情
㈥ 二进制日志
① 参数
log_bin：指定日志位置和名称【注意一下：在my.cnf应为log-bin、而作为参数是log_bin】
binlog_format：指定日志格式
sync_binlog：1表示同步写磁盘的方式写日志
② 作用
⑴ 基于时间点恢复
⑵ 复制
㈦ 查询日志
① 参数
log：指定日志名字
log_output：若为TABLE、则在mysql库下
② 作用
记录了所有对MySQL请求的信息
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