postgresql insert into table multiple rows

#POSTGRESQL INSERT INTO TABLE MULTIPLE ROWS OFFLINE#

See non-durable settings in the Pg manual. If you set fsync=off you can also set full_page_writes=off again, just remember to turn it back on after your import to prevent database corruption and data loss. Do not do this if there is already any data you care about in any database on your PostgreSQL install. If and only if you don't mind losing your entire PostgreSQL cluster (your database and any others on the same cluster) to catastrophic corruption if the system crashes during the import, you can stop Pg, set fsync=off, start Pg, do your import, then (vitally) stop Pg and set fsync=on again. Look at the PostgreSQL logs and make sure it's not complaining about checkpoints occurring too frequently.

Set a high max_wal_size value ( checkpoint_segments in older versions) and enable log_checkpoints. How many depends on your hardware's disk subsystem as a rule of thumb, you want one connection per physical hard drive if using direct attached storage.

INSERT or COPY in parallel from several connections. This won't help much if you've batched your work into big transactions, though. Use synchronous_commit=off and a huge commit_delay to reduce fsync() costs. Again, you seem to be doing this already. There's no practical limit AFAIK, but batching will let you recover from an error by marking the start of each batch in your input data. Don't try to list too many values in a single VALUES though those values have to fit in memory a couple of times over, so keep it to a few hundred per statement.īatch your inserts into explicit transactions, doing hundreds of thousands or millions of inserts per transaction. If you can't use COPY consider using multi-valued INSERTs if practical. Do not do this if the import is split across multiple transactions as you might introduce invalid data. If doing the import within a single transaction, it's safe to drop foreign key constraints, do the import, and re-create the constraints before committing. (It takes much less time to build an index in one pass than it does to add the same data to it progressively, and the resulting index is much more compact).

#POSTGRESQL INSERT INTO TABLE MULTIPLE ROWS OFFLINE#

Postgresql insert into table multiple rows