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Added section on performance [skip ci]

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Andrew Kane
2021-10-13 13:56:03 -07:00
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README.md
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@@ -128,6 +128,20 @@ CREATE INDEX ON table USING ivfflat (column) WHERE (other_column = 123);
To index many different values of `other_column`, consider [partitioning](https://www.postgresql.org/docs/current/ddl-partitioning.html) on `other_column`.
## Performance
To speed up queries without an index, increase `max_parallel_workers_per_gather`.
```sql
SET max_parallel_workers_per_gather = 4;
```
To speed up queries with an index, increase the number of inverted lists.
```sql
CREATE INDEX ON table USING ivfflat (column) WITH (lists = 1000);
```
## Reference
### Vector Type