Month: October 2012

If you use RANGE (or RANGE COLUMNS) partitioning, and in particular when partitioning by date/time, then your are subject to the following questions: how and when do you create the “next” partition? How and when do you drop your older partitions?

Many people use in-house scripting to do that, and Giuseppe Maxia wrote Partition Helper. But I would like to take you one step forward, and provide with a query (based on views) which automagically understands which new partition you want to create, and provides you with the statement to do so. It looks somewhat like this (a demo follows later on):

mysql> SELECT * FROM sql_range_partitions \G
*************************** 1. row ***************************
            table_schema: test
              table_name: city
sql_drop_first_partition: alter table `test`.`city` drop partition `p3`
  sql_add_next_partition: alter table `test`.`city` add partition (partition `p_20160101000000` values less than (736329) /* 2016-01-01 00:00:00 */ )
*************************** 2. row ***************************
            table_schema: test
              table_name: quarterly_report_status
sql_drop_first_partition: alter table `test`.`quarterly_report_status` drop partition `p3`
  sql_add_next_partition: alter table `test`.`quarterly_report_status` reorganize partition `p_maxvalue` into (partition `p_20110401000000` values less than (1301608800) /* 2011-04-01 00:00:00 */ , partition p_maxvalue values less than MAXVALUE)

A closer look at why this is magic

This query just gave you the DROP PARTITION and ADD PARTITION for all tables in your databases that use a RANGE partitioning scheme. But, consider: Continue reading » “Your magical RANGE partitioning maintenance query”