" should set innodb_checksum_algorithm=NONE instead."; srv_checksum_algorithm = SRV_CHECKSUM_ALGORITHM_NONE; } innodb_log_checksums_func_update(innodb_log_checksums); #ifdef HAVE_LINUX_LARGE_PAGES if ((os_use_large_pages = my_use_large_pages)) { os_large_page_size = opt_large_page_size...
在innodb_checksum_algorithm中,除了innodb,crc32,none三种选项之外,还有strict带头的选项。strict的选项表示,在读取的时候必须是指定的校验方式的校验值才通过,其他的都不行,例如,指定了strict_crc32,那么在数据页被读取计算checksum时候,对应的校验值必须也是crc32的才可通过,但是如果指定crc32,如果存储的是innodb或者none...
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...
FIL_PAGE_SPACE_OR_CHKSUM:这个占用四字节,主要用来存储数据页的checksum。注意,计算校验值的时候,并不是整个数据页都计算,有几个地方是不计算进去的(buf_calc_page_crc32和buf_calc_page_new_checksum),例如头尾存checksum的地方,存space_id的地方(历史原因导致)。Checksum的计算方式详见数据页Corruption这一小节。
innodb_log_checksum_algorithm innodb_log_checksums innodb_log_compressed_pages innodb_log_file_buffering innodb_log_file_mmap innodb_log_file_size innodb_log_file_write_through innodb_log_files_in_group innodb_log_group_home_dir innodb_log_optimize_ddl innodb_log_spin_wait_delay innodb_log_write...
innodb_log_write_ahead_size 值设置的太小,会导致 read-on-write;设置过大,则会影响 fsync 性能,因为一次需要些多个数据块。 五、InnoDB表的大数据载入 快速插入通用指引: 1、AUTOCOMMIT 导入数据时,关闭 autocommit 模式,避免每次行插入导致的日志刷盘。在执行开始及结束使用 SET AUTOCOMMIT 及 COMMIT 语句: ...
It should only be enabled for a short interval, typically before running DML operations that write redo log entries that would require recovery following a server exit. This option is only available if debugging support is compiled in using the WITH_DEBUG CMake option. innodb_checksum_algorithm...
顺序读写类文件包括:InnoDB system tablespace 文件(基于 doublewrite buffering and change buffering) 及日志文件( binary log 文件和redo log 文件等)。 使用non-rotational 存储时,需要对一下配置进行优化: 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: A checksum calculated in software, using the original algorithm fromInnoDB. crc32: A checksum calculated using thecrc32algorithm, possibly done with a hardware assist. none: A constant number. The--writeoption rewrites entire pages to disk. If the new checksum is identical to the existing...