STATS_SAMPLE_PAGES¶
STATS_SAMPLE_PAGES specifies the number of index pages to sample when cardinality and other statistics for an indexed column are estimated. DSC will delete this attribute during migration.
Input
CREATE TABLE `public`.`runoob_alter_test`(
`dataType1` int NOT NULL AUTO_INCREMENT,
`dataType2` DOUBLE(20,8),
`dataType3` TEXT NOT NULL,
PRIMARY KEY(`dataType1`)
) ENGINE=InnoDB,STATS_SAMPLE_PAGES=25;
ALTER TABLE runoob_alter_test STATS_SAMPLE_PAGES 100;
ALTER TABLE runoob_alter_test STATS_SAMPLE_PAGES=100;
Output
CREATE TABLE "public"."runoob_alter_test"
(
"datatype1" SERIAL NOT NULL,
"datatype2" DOUBLE PRECISION,
"datatype3" TEXT NOT NULL,
PRIMARY KEY ("datatype1")
)
WITH ( ORIENTATION = ROW, COMPRESSION = NO )
NOCOMPRESS
DISTRIBUTE BY HASH ("datatype1");