MySQL :: MySQL 8.4 参考手册 :: 28.4.6 INFORMATION_SCHEMA INNODB_CMP 和 INNODB_CMP

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MySQL 8.4 参考手册 / 28 个 INFORMATION_SCHEMA 表 / 28.4 INFORMATION_SCHEMA InnoDB 表 / 28.4.6 INFORMATION_SCHEMA INNODB_CMP 和 INNODB_CMP_RESET 表

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28.4.6 INFORMATION_SCHEMA INNODB_CMP 和 INNODB_CMP_RESET 表28.4.6 The INFORMATION_SCHEMA INNODB_CMP and INNODB_CMP_RESET Tables

INNODB_CMP 和 INNODB_CMP_RESET 表提供与压缩 InnoDB 表相关操作的状态信息。The INNODB_CMP and INNODB_CMP_RESET tables provide status information on operations related to compressed InnoDB tables.

INNODB_CMP 和 INNODB_CMP_RESET 表具有以下列：The INNODB_CMP and INNODB_CMP_RESET tables have these columns:

PAGE_SIZE
压缩页面的字节大小。The compressed page size in bytes.
COMPRESS_OPS
B 树页面大小为 PAGE_SIZE 的压缩次数。每当创建空页面或未压缩修改日志的空间用完时，页面都会被压缩。The number of times a B-tree page of size PAGE_SIZE has been compressed. Pages are compressed whenever an empty page is created or the space for the uncompressed modification log runs out.
COMPRESS_OPS_OK
B 树页面大小为 PAGE_SIZE 的成功压缩次数。此计数不应超过 COMPRESS_OPS。The number of times a B-tree page of size PAGE_SIZE has been successfully compressed. This count should never exceed COMPRESS_OPS.
COMPRESS_TIME
尝试压缩大小为 PAGE_SIZE 的 B 树页面所用的总时间（秒）。The total time in seconds used for attempts to compress B-tree pages of size PAGE_SIZE.
UNCOMPRESS_OPS
B 树页面大小为 PAGE_SIZE 的解压次数。每当压缩失败或在未存在于缓冲池中的未压缩页面首次访问时，B 树页面会被解压。The number of times a B-tree page of size PAGE_SIZE has been uncompressed. B-tree pages are uncompressed whenever compression fails or at first access when the uncompressed page does not exist in the buffer pool.
UNCOMPRESS_TIME
解压大小为 PAGE_SIZE 的 B 树页面所用的总时间（秒）。The total time in seconds used for uncompressing B-tree pages of the size PAGE_SIZE.

示例Example

mysql> SELECT * FROM INFORMATION_SCHEMA.INNODB_CMP\G
*************************** 1. row ***************************
      page_size: 1024
   compress_ops: 0
compress_ops_ok: 0
  compress_time: 0
 uncompress_ops: 0
uncompress_time: 0
*************************** 2. row ***************************
      page_size: 2048
   compress_ops: 0
compress_ops_ok: 0
  compress_time: 0
 uncompress_ops: 0
uncompress_time: 0
*************************** 3. row ***************************
      page_size: 4096
   compress_ops: 0
compress_ops_ok: 0
  compress_time: 0
 uncompress_ops: 0
uncompress_time: 0
*************************** 4. row ***************************
      page_size: 8192
   compress_ops: 86955
compress_ops_ok: 81182
  compress_time: 27
 uncompress_ops: 26828
uncompress_time: 5
*************************** 5. row ***************************
      page_size: 16384
   compress_ops: 0
compress_ops_ok: 0
  compress_time: 0
 uncompress_ops: 0
uncompress_time: 0

注意事项Notes

使用这些表来衡量数据库中InnoDB表压缩的效果。Use these tables to measure the effectiveness of InnoDB table compression in your database.
你必须拥有 PROCESS 权限才能查询此表。You must have the PROCESS privilege to query this table.
使用 INFORMATION_SCHEMA COLUMNS 表或 SHOW COLUMNS 语句查看关于此表列的更多信息，包括数据类型和默认值。Use the INFORMATION_SCHEMA COLUMNS table or the SHOW COLUMNS statement to view additional information about the columns of this table, including data types and default values.
有关使用信息，请参见第 17.9.1.4 节，“运行时监控 InnoDB 表压缩”和第 17.15.1.3 节，“使用压缩信息模式表”。有关InnoDB表压缩的一般信息，请参见第 17.9 节，“InnoDB 表和页面压缩”。For usage information, see Section 17.9.1.4, “Monitoring InnoDB Table Compression at Runtime” and Section 17.15.1.3, “Using the Compression Information Schema Tables”. For general information about InnoDB table compression, see Section 17.9, “InnoDB Table and Page Compression”.

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