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

DELAY_KEY_WRITE

DELAY_KEY_WRITE is valid only for MyISAM tables. It is used to delay updates until the table is closed. GaussDB(DWS) does not support table definition modification using this attribute. DSC will delete the attribute during migration.

Input

1
2
3
4
5
6
7
8
 
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, DELAY_KEY_WRITE=0;

ALTER TABLE `public`.`runoob_tbl_test6` DELAY_KEY_WRITE=1;

Output

 1
 2
 3
 4
 5
 6
 7
 8
 9
10
 
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");