mysql alter table drop partition
Rearrange partitions doesn't require drop all existing partitions. The following statement is used to delete all rows from the partition p0 of table Sales: Description: Partitioning has no way to take a partition offline while preserving the underlying data. ALTER TABLE statement can be used for adding, dropping, merging, and splitting partitions, and for performing partitioning maintenance. I have 20 million rows. If you must remove a partition from a table that is active, you should: Setup MySQL Replication (if you haven't done so already) Perform all SELECTs involving v3_cam_date against the Slave; STOP SLAVE; on the Slave; Perform ALTER TABLE ... DROP PARTITION on the Master. ALTER TABLE: Partition operations. I don't want to copy into staging table then truncate. Range partitioning ALTER TABLE DROP PARTITION will delete the underlying file and table. Is it possible in SQL server 2008 or 2008r2? Please see the code below. The data is stored in an internal INNODB or MyISAM table not visible to the MySQL process except through the partitioned table. The ALTER TABLE … DROP PARTITION command can drop partitions of a LIST or RANGE partitioned table; please note that this command does not work on a HASH partitioned table. Here we have defined a nonpartitioned table: CREATE TABLE sale_mast ( bill_no INT, bill_date DATETIME ); Slides from Percona Amsterdam 2015. Using Switch need same table structure and column order, indexes, computed columns.... etc. For example, if t1 is currently not an InnoDB table, this statement changes its storage engine to InnoDB:. Original writing -- Oct, 2012; Use cases added: Oct, 2014; Refreshed: June, 2015; 8.0: Sep, 2016 . Sometimes our table contains the data that is useless in the partition table. 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 … In that case, we can drop single or multiple partitions based on the need. ALTER table testing_user PARTITION BY HASH( YEAR(created) ) PARTITIONS 10; The above query will create 10 even size partition of the table testing_user on the basis of id and year in which the user was created. When you delete a partition, any subpartitions (of that partition) are deleted as well. Issue the ALTER TABLE DROP PARTITION statement without maintaining global indexes. ALTER TABLE t1 ENGINE = InnoDB; If the table is already InnoDB, this will rebuild the table and its indexes and have an effect similar to OPTIMIZE TABLE.You may gain some disk space improvement. ALTER TABLE tbl REORGANIZE PARTITION future INTO (PARTITION from20150606 VALUES LESS THAN (736121), PARTITION future VALUES LESS THAN MAXVALUE) ALTER TABLE tbl DROP PARTITION from20150603 Postlog. I don’t want to drop Partition function or Schema. Naming Conventions: Partition names should follow the same MySQL naming conventions used for tables and databases. The PARTITION options used to determine the new partitioning scheme are subject to the same rules as those used with a CREATE TABLE statement.. A new RANGE partitioning scheme cannot have any overlapping ranges; a new LIST partitioning scheme cannot have any overlapping sets of values.. DROP MySQL Partition. Regardless of storage engine, DDL of any kind will lock a table. Changing storage engine; rebuild table; change file_per_table. Suppose you want to partition the table on the basis of year in which the user was created. For instance, if you partition a table into four, then MySQL will use the partition numbers 0, 1, 2, and 3 to identify each partition. The ALTER TABLE… DROP PARTITION command deletes a partition and any data stored on that partition. I want to drop partitions 2 and 4 alone. Afterward, you must rebuild any global indexes (whether partitioned or not) because the index (or index partitions) has been marked UNUSABLE.The following statements provide an example of dropping partition dec98 from the sales table, then rebuilding its global nonpartitioned index.