Tag Archives: Temporal datatypes

How to Easily Identify Tables With Temporal Types in Old Format!

The MySQL 5.6.4 release introduced support for fractional values within the temporal datatypes: TIME, DATETIME, and TIMESTAMP. Hence the storage requirement and encoding differs for them in comparison to older (5.5 and earlier) temporal datatypes. The storage format for the temporal datatypes in the old format are not space efficient either, and recreating tables having both the new and old formats can be a long and tedious process.…

Upgrading old MySQL-5.5 format temporals to MySQL-5.6 format.

The temporal datatypes ‘TIME/DATETIME/TIMESTAMP’ supports fractional values starting from MySQL 5.6.4 version. Hence the storage requirement and encoding differs in comparison to pre- MySQL 5.6.4 temporal datatypes.

As mentioned in the section ‘Upgrading from MySQL 5.5 to 5.6’,
http://dev.mysql.com/doc/refman/5.6/en/upgrading-from-previous-series.html
Once you have imported the pre-MySQL 5.6.4 tables, ‘ALTER TABLE’ allows creation of tables containing temporal columns of both mysql-5.5 and mysql-5.6 format.…