how to drop partition without dropping data in MySQL?
Solution 1
ALTER TABLE tbl REMOVE PARTITIONING;
Solution 2
You can reorganize the partition p0
using the ALTER TABLE .. REORGANIZE PARTITION
command.
http://dev.mysql.com/doc/refman/5.5/en/partitioning-management-range-list.html
If you intend to change the partitioning of a table without losing data, use ALTER TABLE ... REORGANIZE PARTITION
ALTER TABLE registrations
REORGANIZE PARTITION p0 INTO (
PARTITION p0 VALUES LESS THAN (10000),
PARTITION p0 VALUES LESS THAN (20000)
);
Note that this will not make sense until you actually create several partitions e.g.
ALTER TABLE registrations
REORGANIZE PARTITION p0 INTO (
PARTITION p0 VALUES LESS THAN (10000),
PARTITION p1 VALUES LESS THAN (20000),
PARTITION p2 VALUES LESS THAN MAXVALUE
);
Have a look at RANGE partitioning in MySQL
If your partition p2
is becoming too large you can split it the same way.
Solution 3
Rearrange partitions doesn't require drop all existing partitions. You can specified the new partitioning in the ALTER TABLE
syntax directly, and no data will be lost.
ALTER TABLE registrations
PARTITION by RANGE(id) (
PARTITION p1 VALUES LESS THAN (10000),
PARTITION p2 VALUES LESS THAN (20000),
PARTITION p3 VALUES LESS THAN (30000),
PARTITION p4 VALUES LESS THAN (40000),
PARTITION p5 VALUES LESS THAN (MAXVALUE);
P.S. Tested with MySQL 5.7.11
vidyadhar
Working as a junior database administrator for MySQL and PostGreSQL databases
Updated on August 23, 2020Comments
-
vidyadhar over 3 years
I have a table like:
create table registrations( id int not null auto_increment primary key, name varchar(50), mobile_number varchar(13)) engine=innodb partition by range(id) ( partition p0 values less than (10000), partition p0 values less than (20000), partition p0 values less than max value);
Not exactly like above but similar to that....
Now assume that my table has 200000 rows and now I want to remove partitions on the table and reorganize them in accordance to requirement without MAX VALUE in it.
Can any one help me to rearrange partition without dropping data or dropping table and recreating it ?