Reindex without locking

Rebuild a bloated index online; note: must run outside a transaction

REINDEX INDEX CONCURRENTLY <name>; -- note: cannot run inside a transaction block

More postgres commands

Create index online

CREATE INDEX CONCURRENTLY idx_<name> ON <table>(col); -- monitor: SELECT * FROM pg_stat_progress_create_index;

Build index without blocking writes; track progress via pg_stat_progress_create_index
Parallel dump and restore

pg_dump -Fc -j 4 -d <name> -f db.dump && pg_restore -j 4 -d <name> db.dump

Custom-format parallel dump/restore; note: -j needs directory or custom format, not plain SQL
Benchmark with pgbench

pgbench -c 32 -j 8 -T 60 -P 5 -d <name>; -- init once: pgbench -i -s 100 <name>

Run 60s load test with 32 clients across 8 threads, progress every 5s
Connect to database

psql -h localhost -U myuser -d mydb

Interactive psql session to a database
List databases

psql -U postgres -c '\l+'

Show all databases with size and encoding