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In the previous article we covered how the PostgreSQL planner reads pg_class and pg_statistic to estimate row counts, choose join strategies, and decide whether an index scan is worth it. The message was clear: when statistics are wrong, everything else goes with it. Streaming replication provides bit-to-bit replication, so all replicas share the same statistics with primary server. But there was
Have you ever watched long running migration script, wondering if it's about to wreck your data? Or wish you can "just" spin a fresh copy of database for each test run? Or wanted to have reproducible snapshots to reset between runs of your test suite, (and yes, because you are reading boringSQL) needed to reset the learning environment? When your database is a few megabytes, pg_dump and restore wo
As the database size increases and the number of transactions per second rise, you'll inevitably face the challenge of the table bloat. Although PostgreSQL assists as much as possible with its auto-vacuum feature, there will come a time when you will compel whether to run VACUUM FULL. Unless you have option of longish downtime windows, this is not an easy decision. Thankfully, the rich ecosystem o
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