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Tag: planetpostgresql
04 December 2024
Unique Constraint Violations During Inserts Cause Bloat in PostgreSQL
The issue of table and index bloat due to failed inserts on unique constraints is well known and has been discussed in various articles across the internet. However, these discussions sometimes lack a clear, practical example with measurements to illustrate the impact. And despite the familiarity of this issue, we still frequently see this design […]
15 October 2024
TOASTed JSONB data in PostgreSQL: performance tests of different compression algorithms
TOAST (The Oversized Attribute Storage Technique) is PostgreSQL‘s mechanism for handling large data objects that exceed the 8KB data page limit. Introduced in PostgreSQL 7.1, TOAST is an improved version of the out-of-line storage mechanism used in Oracle databases for handling large objects (LOBs). Both databases store variable-length data either inline within the table or […]
03 September 2024
Quick Benchmark: ANALYZE vs. maintenance_io_concurrency
Introduction Running ANALYZE (either explicitly or via auto-analyze) is very important in order to have uptodate data statistics for the Postgres query planner. In particular after in-place upgrades via pg_upgrade, ANALYZE needs to be run in order to have any query statistics at all. As ANALYZE samples only parts of the blocks in a table […]
26 March 2024
Bloat of internal tables due to frequently created and dropped relations
Overview Tables that are created and dropped on demand, whether they are temporary or regular, are frequently used by application developers in PostgreSQL to simplify the implementation of various functionalities and to expedite responses. Numerous articles on the internet describe the advantages of using such tables for storing search results, precalculating figures for reports, importing […]
22 February 2024
Quick Benchmark: PostgreSQL 2024Q1 Release Performance Improvements
The PostgreSQL 2024Q1 back-branch releases 16.2, 15.6, 14.11, 13.14 and 12.18 on February 8th 2024. Besides fixing a security issue (CVE-2024-0985) and the usual bugs, they are somewhat unique in that they address two performance problems by backporting fixes already introduced into the master branch before. In this blog post, we describe two quick benchmarks […]