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Moved FAQ [skip ci]

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Andrew Kane
2023-11-29 22:09:09 -08:00
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@@ -414,14 +414,6 @@ Yes, pgvector uses the write-ahead log (WAL), which allows for replication and p
You’ll need to use [dimensionality reduction](https://en.wikipedia.org/wiki/Dimensionality_reduction) at the moment.
#### Do indexes need to fit into memory?
No, but as with other index types, you’ll likely see better performance if they do. You can get the size of an index with:
```sql
SELECT pg_size_pretty(pg_relation_size('index_name'));
```
#### Can I store vectors with different dimensions in the same column?
You can use `vector` as the type (instead of `vector(3)`).
@@ -471,6 +463,14 @@ and query with:
SELECT * FROM items ORDER BY embedding::vector(3) <-> '[3,1,2]' LIMIT 5;
```
#### Do indexes need to fit into memory?
No, but like other index types, you’ll likely see better performance if they do. You can get the size of an index with:
```sql
SELECT pg_size_pretty(pg_relation_size('index_name'));
```
## Troubleshooting
#### Why isn’t a query using an index?