Since I only recently learned about the concept of “killed index tuples”, I thought there might be some others […]
Foreign Key Indexing and Performance in PostgreSQL
by
Laurenz Albe |
10.2018Foreign key constraints are an important tool to keep your database consistent while also documenting relationships between tables. A fact […]
Correlation of PostgreSQL columns explained
by
Laurenz Albe |
09.2018After you ANALYZE a PostgreSQL table to collect value distribution statistics, you will find the gathered statistics for each column […]
Rules or triggers to log bulk updates?
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Laurenz Albe |
07.2018 Inspired by my co-worker's recent blog post, I decided to revisit the old question of rules vs. triggers and […]
Adding an index can decrease SELECT performance
by
Laurenz Albe |
06.2018 We all know that you have to pay a price for a new index you create — data modifying […]
In a recent wrestling match with the Linux “out-of-memory killer” for a CYBERTEC customer I got acquainted with Linux […]
Avoiding “OR” for better query performance
by
Laurenz Albe |
05.2018 PostgreSQL query tuning is our daily bread at CYBERTEC, and once you have done some of that, you'll start […]
xmax is a PostgreSQL system column that is used to implement Multiversion Concurrency Control (MVCC). The documentation is somewhat terse: […]
Why should I get rid of unused indexes? Everybody knows that a database index is a good thing because it […]
Four reasons why VACUUM won't remove dead rows from a table
by
Laurenz Albe |
03.2018Why vacuum? Whenever rows in a PostgreSQL table are updated or deleted, dead rows are left behind. VACUUM gets rid […]
