The partitioning improvement that almost was

Today I was looking for the ALTER TABLE EXCHANGE PARTITION feature for a customer, and it looks like it did not get included into MySQL 5.5, although there is a hint of it in the documentation index, and you can find quite a few blog posts and presentations about it. The command simply throws a syntax error:

alter table t exchange partition p1 with table t2;

The worklog is still open, although a related bug report it mentions is closed and pushed into trunk. (It confused me for a moment until I realized that what was pushed into trunk, and released in 5.5, was TRUNCATE PARTITION support.)

Here’s hoping this gets included in a future release – this is a great feature that can make partitions much more amenable to operational tasks such as moving data from one partitioned table to another, or exporting a partition to a table, then exporting the table with xtrabackup and importing it onto another server.


About The Author

Baron is the founder and CEO of VividCortex. He is the author of High Performance MySQL and many open-source tools for performance analysis, monitoring, and system administration. Baron contributes to various database communities such as Oracle, PostgreSQL, Redis and MongoDB.


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