Database Administration & Monitoring

Insert…on conflict with partitions finally works in PostgreSQL 11

Another partitioning improvement for PostgreSQL 11: Insert...on conflict is now supported (for most cases) in PostgreSQL 11 thanks to this commit. Lets see how it works.

How reimaging detects the ODA hardware?

A long time ago, ODA referred to the only model that existed (nearly). Actually, not so long time ago, as ODA X3, X4 and X5 were released between 2013 and 2015. And it was quite the same hardware. Now there(…)

The WAL segment size becomes changeable in PostgreSQL 11

Up to PostgreSQL 10 the wal segment size was fixed once PostgreSQL was compiled and installed. When you wanted to have something else than the default you needed to tell that to the configure command when building from source, e.g.

The same MAC address for two interfaces on the same host?

Yes, sounds strange, but exactly this is what we faced today. In the end it is clear and not strange anymore but for a moment we really thought we are hitting a bug in the operating system, which was RedHat(…)

When you execute the same statement thousands of times -> prepare it

Every time you send a SQL statement to PostgreSQL it must be parsed. Parsing is fast, yes, but parsing the same statement a thousand times can quickly sum up to quite some time the database could spend for something else.

PostgreSQL – logical replication with pglogical

Although PostgreSQL 10 integrate native logical replication (have a look here or here), it is always interesting to be aware of alternative solutions to the available in-core features. One of those is called(…)

Updating the partition key now works in PostgreSQL 11

In the last post about partitioning improvements in PostgreSQL 11 we talked about unique indexes and primary keys on partitioned tables. Both did not work in PostgreSQL 10 but now do in PostgreSQL 11. Another operation that(…)

Hash Partitioning in PostgreSQL 11

By Mouhamadou Diaw PostgreSQL 10 comes with partition support. But Hash Partitioning was not supported. PostgreSQL 11 will support Hash Partition. In the documentation we can read The table is partitioned by specifying a modulus and a remainder(…)

What is the maximum in list size in PostgreSQL?

Yesterday, while being at a customer, an interesting question popped up: What is the maximum of in list values in PostgreSQL? I couldn't answer although I never read somewhere that there is a limit. The following is for fun only(…)

Local partitioned indexes in PostgreSQL 11

When declarative partitioning was introduced with PostgreSQL 10 this was a big step forward. But as always with big new features some things do not work in PostgreSQL 10 which now get resolved in PostgreSQL 11. One of those are(…)