Help Center/ Data Warehouse Service / Tool Guide/ DSC/ MySQL Syntax Migrating/ Table (Optional Parameters and Operations)/ KEY_BLOCK_SIZE
Updated on 2025-04-10 GMT+08:00
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KEY_BLOCK_SIZE

KEY_BLOCK_SIZE choices vary depending on the storage engine used for a table. For MyISAM tables, KEY_BLOCK_SIZE optionally specifies the size in bytes to be used for index key blocks. For InnoDB tables, KEY_BLOCK_SIZE specifies the page size in kilobytes to be used for compressed InnoDB tables. GaussDB(DWS) does not support this attribute, which will be deleted by DSC during migration.

Input

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CREATE TABLE `public`.`runoob_tbl_test`(
    `runoob_id` VARCHAR(30),
    `runoob_title` VARCHAR(100) NOT NULL,
    `runoob_author` VARCHAR(40) NOT NULL,
    `submission_date` VARCHAR(30)
) ENGINE=MyISAM KEY_BLOCK_SIZE=8;

ALTER TABLE runoob_tbl_test ENGINE=InnoDB;
ALTER TABLE runoob_tbl_test KEY_BLOCK_SIZE=0;

Output

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CREATE TABLE "public"."runoob_tbl_test"
(
  "runoob_id" VARCHAR(120),
  "runoob_title" VARCHAR(400) NOT NULL,
  "runoob_author" VARCHAR(160) NOT NULL,
  "submission_date" VARCHAR(120)
)
  WITH ( ORIENTATION = ROW, COMPRESSION = NO )
  NOCOMPRESS
  DISTRIBUTE BY HASH ("runoob_id");