PostgreSQL Constraint CHECK Failing on NULL Values, Unexpected Behavior
A CHECK constraint that seems to allow a NULL value through, despite the constraint's condition apparently not being satisfied by NULL, is actually correct,...
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PostgreSQL "Prepared Statement Does Not Exist" Error in Connection Poolers (PgBouncer)
"Prepared statement does not exist" specifically under PgBouncer almost always comes down to a fundamental incompatibility between how prepared statements work...
PostgreSQL Query Slow After Bulk Insert (VACUUM ANALYZE Required)
A query that was fast before a large bulk insert but becomes slow immediately afterward almost always means PostgreSQL's query planner is working from outdated...
Postgres "Permission Denied for Schema Public" After PostgreSQL 15 Update
"Permission denied for schema public" appearing right after upgrading to PostgreSQL 15 isn't a bug or a misconfiguration you introduced — it's the direct,...
PostgreSQL Connection Closed Unexpectedly During Large Transaction
A connection dropping specifically during a large, long-running transaction usually comes down to one of a few specific limits being hit — a statement timeout,...
PostgreSQL "Deadlock Detected" During Concurrent Batch Updates
Deadlocks during concurrent batch updates specifically (as opposed to normal application traffic) almost always come down to multiple batch processes updating...
PostgreSQL COPY Command Permission Denied on Server
A permission denied error on COPY almost always comes down to confusing server-side COPY (which reads/writes files on the database server's own filesystem,...
PostgreSQL Enum Type Migration Failing in Production
PostgreSQL enum migrations failing specifically in production, despite working fine in local testing, is almost always related to ALTER TYPE ... ADD VALUE's...
PostgreSQL JSON Column Query Returning Null Unexpectedly
When a query against a JSON or JSONB column returns null even though the data clearly contains the key you're looking for, it's almost always because of the...