使用non-rotational 存储时,需要对以下配置进行优化: innodb_checksum_algorithm:crc32 算法使用了一种更快的一致性检查算法,对于高速存储设备,推荐使用。 innodb_flush_neighbors:针对 rotational 存储设备优化。对于 non-rotational 设备或者混用情景,则需禁用。 innodb_io_capa
The algorithm InnoDB uses for page checksumming. Possible values are FULL_CRC32 for new files, always use CRC-32C; for old, see CRC32 below; STRICT_FULL_CRC32 for new files, always use CRC-32C; for old, see STRICT_CRC32 below; CRC32 write crc32, allow any of the other checksums to ma...
innodb_checksum_algorithm=strict_crc32 Slow Log and binlog is opened Query Response time : 3.15 sec In SLAVE innodb_checksum_algorithm=innodb Slow log and binlog is not opened Query Response time : 4.75 sec Is the cause of innodb_checksum_algorithm which is making differenceNavigate...
innodb_checksum_algorithm=strict_crc32 Slow Log and binlog is opened Query Response time : 3.15 sec In SLAVE innodb_checksum_algorithm=innodb Slow log and binlog is not opened Query Response time : 4.75 sec Is the cause of innodb_checksum_algorithm which is making differenceNavigate...
innodb_checksum_algorithm crc32选项使用更快的校验和算法,推荐用于快速存储系统。 innodb_flush_neighbors 该选项优化了旋转存储设备的I / O。 禁用它用于非旋转存储或混合旋转和非旋转存储。 innodb_io_capacity 对于较低端的非旋转存储设备,默认设置200通常是足够的。 对于更高端的总线连接设备,考虑更高的设置,如...
innodb_checksum_algorithm:crc32算法使用了一种更快的一致性检查算法,对于高速存储设备,推荐使用。 innodb_flush_neighbors:针对rotational存储设备优化。对于non-rotational设备或者混用情景,则需禁用。 innodb_io_capacity:默认的200设定对于低端non-rotational存储设备已经足够。其它,酌情设置。
Data files that were created before MySQL 5.1.48 orMariaDB 5.1.48could contain arbitrary garbage in unused parts of data pages. Even though we try to keep this in mind, sometimes bugs likeMDEV-27800happen. The only way to convert files to the secureinnodb_checksum_algorithm=full_crc32format...
In this example, the innodb checksum algorithm is specified: innochecksum --strict-check=innodb ../data/test/tab1.ibd In this example, the crc32 checksum algorithm is specified: innochecksum -C crc32 ../data/test/tab1.ibd The following conditions apply: If you do not specify the --str...
数据页的checksum值的计算方法依赖参数innodb_checksum_algorithm。目前提供三种计算checksum的方法,第一种是crc校验(buf_calc_page_crc32),这种是一种比较新的计算方法,但是可以使用cpu硬件指令来加速。第二种是innodb校验,是innodb自己开发的一种计算方法,但是有新老两种变体,两种变体计算结果不同,为了兼容老的变体,需...
因此,若想要完全升级数据库,享受素有的性能提升优化点,或许还需要更新新页的校验值,并将参数innodb_checksum_algorithm设置为strict_crc32。而这可以通过innochecksum来完成。通过innochecksum来修改页校验值是非常危险的操作,建议操作前备份。但若遇到页损毁的问题,可以通过该工具重写页的校验值。