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Database Archives - PostgreSQL Candies

Event triggers in PostgreSQL 11

Based on documentation and several different examples on web I created this code for event triggers for PG 11. Maybe it can be useful for someone else too: — auditing table — CREATE TABLE IF NOT EXISTS public.ddl_history (ddl_date TIMESTAMP, ddl_tag TEXT,...

Temporary tablespace – small notes

Lately I did some research and tests regarding special dedicated temporary tablespace so here is small summary of what I have found: (I described it on stackoverflow too) PostgreSQL tablespace is just a directory – no big deal. Plus – if you will use it...

Check real sizes of columns in tables

Do you need to know which columns takes most disk space in your tables? Here is one useful statement: with srcdata as ( select table_schema||'.'||table_name as _table, column_name as _column, count(column_name) over (partition by table_schema, table_name) as...

Playing with JSON data in PostgreSQL

still in TODO Overview: JSON is right now very “fashionable” data format. And as they say “everyone uses it” or “it powers the whole web” etc. I remember times when XML format was “the coolest of all” and now it is...

PostgreSQL and time zones

If you do not feel anything special when someone says “timezones” then you can consider yourself to be lucky. If your application runs only in your local time zone a you never ever need to convert date/time between timezones then you are really lucky. But...