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All versions of PostgreSQL. Add an additional version-specific tag like [postgresql-13] if that context is relevant.

4 votes
1 answer
4k views

Could not open file "pg_clog/0000": No such file or directory

My local PostgreSql 9.2 database won't start anymore this morning. I am on Windows 7. Yesterday, I performed a Windows Update before going to bed. … Should I reinstall PostgreSql 9.2? Is there a command to restore it in a proper state? …
Jérôme Verstrynge's user avatar
4 votes
2 answers
3k views

Should I create an index for non key columns?

I have a table in a PostGreSql database defined as following: CREATE TABLE public." …
Jérôme Verstrynge's user avatar
2 votes
1 answer
644 views

How to perform asynchronous cascade slave replication of PostgreSQL database?

Let's imagine a PostgreSQL database running online (like those from Heroku for example). … Is this possible from a PostgreSQL perspective? If yes, what would be the best Postgres implementation/configuration strategy? What do I need to learn? …
Jérôme Verstrynge's user avatar
26 votes
2 answers
68k views

PgAdmin III - How to connect to database when password is empty?

I have installed PostgreSQL 9.1 on my PC (Win 7). I have a small Java application connecting successfully to it with login=sa and password="". The connection works. …
Jérôme Verstrynge's user avatar
0 votes
1 answer
275 views

Is there a benefit to using FOR SHARE in this PostgreSql simple select?

In the following PgSql stored function: CREATE OR REPLACE FUNCTION get_offer_from_id( offer_id bigint) RETURNS json AS $$ DECLARE res "entity_data_result"; r "get_offer_data"; B …
Jérôme Verstrynge's user avatar
0 votes
1 answer
2k views

How to update array fields in a table in Postgresql?

next_a1; tmp_a2 := r.a2 || next_a2; UPDATE my_tbl SET ( "a1", "a2" ) = ( tmp_a1, tmp_a2 ) WHERE "id" = iid; END LOOP; END; $$ LANGUAGE plpgsql; I am on Postgresql
Jérôme Verstrynge's user avatar
3 votes
1 answer
12k views

How to generate time in milliseconds in PostgreSQL stored procedure?

I have been reading the Postgres documentation about timestamps, but I am still a little bit confused. I need to store moments in times, measured in milliseconds, between the current time and midnigh …
Jérôme Verstrynge's user avatar
1 vote
1 answer
2k views

Explain PostgreSql ssl_cipher values: ALL:!ADH:!LOW:!EXP:!MD5:@STRENGTH

In the postgresql.conf file, one can configure authorized values for ssl_cipher. Yet I could not find documentation explaining what the ALL, ADH, LOW, EXP, MD5 and STRENGTH values correspond to. MD5 …
Jérôme Verstrynge's user avatar