PostgreSQLeasy

PostgreSQL `COPY`: what is it used for and why is it fast?

Answer

`COPY` is used for bulk importing/exporting data (from/to a file or STDIN/STDOUT). It’s fast because it’s optimized for bulk operations and avoids per-row overhead that you often get with many individual INSERTs.

COPY users(email, created_at)
FROM STDIN WITH (FORMAT csv, HEADER true);

Related questions

PostgreSQL

How do `pg_stat_activity` and `pg_stat_statements` help in troubleshooting?

#postgres#monitoring#pg_stat_activity

PostgreSQL

Materialized view vs view: what’s the difference?

#postgres#views#materialized-view

PostgreSQL

LISTEN/NOTIFY: what problem does it solve?

#postgres#listen-notify#pubsub

PostgreSQL

Advisory locks: what are they and when would you use them?

#postgres#locks#advisory

PostgreSQL

BRIN index: when is it useful?

#postgres#brin#indexes

PostgreSQL

GIN vs GiST indexes: when would you use each?

#postgres#indexes#gin