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Updated example [skip ci]

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Andrew Kane
2022-08-01 00:06:45 -07:00
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@@ -131,16 +131,20 @@ Note: `tuples_done` and `tuples_total` are only populated during the `loading tu
Consider [partial indexes](https://www.postgresql.org/docs/current/indexes-partial.html) for queries with a `WHERE` clause
```sql
SELECT * FROM items WHERE store_id = 123 ORDER BY embedding <-> '[3,1,2]' LIMIT 5;
SELECT * FROM items WHERE category_id = 123 ORDER BY embedding <-> '[3,1,2]' LIMIT 5;
```
can be indexed with:
```sql
CREATE INDEX ON items USING ivfflat (embedding vector_l2_ops) WHERE (store_id = 123);
CREATE INDEX ON items USING ivfflat (embedding vector_l2_ops) WHERE (category_id = 123);
```
To index many different values of `store_id`, consider [partitioning](https://www.postgresql.org/docs/current/ddl-partitioning.html) on `store_id`.
To index many different values of `category_id`, consider [partitioning](https://www.postgresql.org/docs/current/ddl-partitioning.html) on `category_id`.
```sql
CREATE TABLE items (embedding vector(3), category_id int) PARTITION BY LIST(category_id);
```
## Performance