Postgres Basics Archives -

Find the size of a table in Postgres

25/02/202025/02/2020 by Philip

You often need to know the size of a table in postgres and there is no particularly easy way to get that information directly from the psql client. Fortunately, all of the information is in there and is available through nice simple functions. All you have to do is pull it together and a stock …

Postgres Vacuum and AutoVacuum.

03/01/202002/09/2019 by Philip

Basics of vacuum Postgres maintains multi version consistency by keeping old versions of changes tuples instead of actually deleting them. Eventually, keeping all of those out of date versions becomes big burden in terms of storage and performance. Eventually, you end up with bloated tableland indexes. If not felt with, eventually they would fill up tour disks but they would probably make the database unusable before then so we have a handy process to clean it all up. That is Vacuum. Postgres Vacuum goes through your tables and indexes an cleans out had tuples – that is tuples that can no longer be needed by a transaction.

Backing up and Restoring Postgres using pg_basebackup

02/09/201930/08/2019 by Philip

There are several great tools available that handle backing up and managing the backups of your PostgresQL database. It is really important to understand the underlying process that these tools use though as well as the standard postgres commands are that you would need to run in case you ever need to do it manually.

There are 2 types of backups that you can take in Posgres, logical and physical. Logical backups are in the form if the SQL statements necessary to recreate the database (not necessarily in a human readable form). The 2 tools to take logical backups are pg_dump and pg_dumpall.