This makes “temperatures” a partition master table, and tells PostgreSQL that “temperatures” table like this: CREATE TABLE temperatures ( at date, city text, mintemp integer, maxtemp integer ) PARTITION BY RANGE ( at ) Can weĭo this without changing the application code? Schema, query each of them and combine the results from each table. Temperatures of a city, it now has to find out what tables are present in the If it has to access older data, say getting the annual min and max
#POSTGRES 14 SHARDING CODE#
Main “temperatures” table smaller and faster for the application to work with.Īs a bonus, if you now need to delete old data, you can do so without slowingĭown inserts of incoming data into the main/current table because the old dataīut having multiple, distinct tables means that the application code now has To move all entries from the year 2017 into another table. This: CREATE TABLE temperatures_2017 ( LIKE temperatures ) INSERT INTO temperatures_2017 SELECT * FROM temperatures WHERE extract ( year from at ) = 2017 DELETE FROM temperatures WHERE extract ( year from at ) = 2017 Old data into another table, with the same structure. As our “temperatures” table grows, it makes sense to move out the Think current financial year, this month, last hourĪnd so on. It is very common to find that in many applications the recent-most data is To keep things simple – we’ll add these later. The table spec is intentionally devoid of column constraints and primary key Declarative PartitioningĬonsider a table that store the daily minimum and maximum temperatures ofĬities for each day: CREATE TABLE temperatures ( at date, city text, mintemp integer, maxtemp integer ) Wrappers, providing a mechanism to natively shard your tables across multiple In version 11 (currently in beta), you can combine this with foreign data
Version 10 of PostgreSQL added the declarative table partitioning feature.
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