Maintenance of Partitions Table maintenance of partitioned tables can be accomplished using the statements  CHECK TABLE , OPTIMIZE TABLE ,  ANALYZE TABLE , and  REPAIR TABLE , which are supported for partitioned tables. You can use a number of extensions to  ALTER TABLE  for performing operations of this type on one or more partitions directly, as described in the following list: Example: Example: Some MySQL storage engines, including  InnoDB , do not support per-partition optimization; in these cases,  ALTER TABLE ... OPTIMIZE PARTITION  analyzes and rebuilds the entire table, and causes an appropriate warning to be issued. (Bug #11751825, Bug #42822) Use  ALTER TABLE ... REBUILD PARTITION  and  ALTER TABLE ... ANALYZE PARTITION  instead, to avoid this issue. Example: Example: Normally,  REPAIR PARTITION  fails when the partition contains duplicate key errors. You can use ALTER IGNORE TABLE  with this option, in which case all rows that cannot be moved due to the presence of duplicate keys are removed from the partition (Bug #16900947). Example: Normally,  CHECK PARTITION  fails when the partition contains duplicate key errors. You can use  ALTER IGNORE TABLE  with this option, in which case the statement returns the contents of each row in the 4702 • Checking partitions.   You can check partitions for errors in much the same way that you can use CHECK TABLE  with nonpartitioned tables. • Repairing partitions.   This repairs corrupted partitions. • Analyzing partitions.   This reads and stores the key distributions for partitions. • Optimizing partitions.   If you have deleted a large number of rows from a partition or if you have made many changes to a partitioned table with variable-length rows (that is, having  VARCHAR ,  BLOB , or TEXT  columns), you can use  ALTER TABLE ... OPTIMIZE PARTITION  to reclaim any unused space and to defragment the partition data file. • Rebuilding partitions.   Rebuilds the partition; this has the same effect as dropping all records stored in the partition, then reinserting them. This can be useful for purposes of defragmentation. ALTER TABLE t1 REBUILD PARTITION p0, p1; ALTER TABLE t1 OPTIMIZE PARTITION p0, p1; Using  OPTIMIZE PARTITION  on a given partition is equivalent to running  CHECK PARTITION , ANALYZE PARTITION , and  REPAIR PARTITION  on that partition. ALTER TABLE trb3 CHECK PARTITION p1; ALTER TABLE t1 REPAIR PARTITION p0,p1; ALTER TABLE t1 ANALYZE PARTITION p3; This statement tells you whether the data or indexes in partition  p1  of table  t1  are corrupted. If this is the case, use  ALTER TABLE ... REPAIR PARTITION  to repair the partition.