mirror of
https://github.com/lancedb/lancedb.git
synced 2026-10-30 15:26:52 +00:00
Jack Ye
ddb318567a
## Summary - Complete the SQL reference: `ATTACH DATABASE`, the `CHANGES` clause, and `dedupe()`/`duplicate_pairs()` (verified against current sophon source; these were recently renamed from `vector_dedup`/`vector_duplicate_pairs`). Fix the blob-column default-projection claim and add the previously undocumented `blob_descriptor()`. - Enrich the gated Functions draft (still `.mintignore`'d, pre-release): chained Functions over blob outputs, GPU-produced blobs, Secrets, multi-input/output binding, `code=[module]` packaging. - Upgrade the materialized-view and computed-column auto-refresh drafts with precise, verified catch-up semantics, and add the missing `ALTER MATERIALIZED VIEW` / `CREATE ... WITH(...)` sections (also gated — the automatic-refresh scheduler is still dev/staging-only). - Thread one running example (video frames → GPU extract/caption → dedup → auto-refreshing materialized view) through Functions, materialized views, and the LeRobotDataset integration guide instead of a separate tutorial. - Rename "LanceDB OSS"/"OSS" to "LanceDB Embedded"/"Embedded" throughout (52 files); activate the existing availability-comparison mechanism on `basics/offerings.mdx` for a full feature-by-feature comparison table.
61 lines
2.0 KiB
Plaintext
61 lines
2.0 KiB
Plaintext
---
|
|
title: "Index"
|
|
sidebarTitle: "Index"
|
|
description: "CREATE INDEX and DROP INDEX: one column, with the algorithm chosen by USING."
|
|
icon: bolt
|
|
keywords: ["create index", "drop index", "sql"]
|
|
availability:
|
|
embedded: unavailable
|
|
enterprise: available
|
|
---
|
|
|
|
## CREATE INDEX {#create}
|
|
|
|
```sql
|
|
CREATE INDEX ON documents USING btree (title)
|
|
CREATE INDEX text_search ON documents USING fts (text)
|
|
```
|
|
|
|
`USING` is required: it names the algorithm. The scalar algorithms are `btree`,
|
|
`bitmap` and `label_list`; `fts` builds a full-text index; and the vector
|
|
algorithms are `ivf_pq`, `ivf_rq`, `ivf_flat`, `ivf_hnsw_sq` and `ivf_hnsw_pq`,
|
|
where the deployment supports them. Index options go in a `WITH (...)` clause.
|
|
|
|
<Note>
|
|
In LanceDB Enterprise, SQL `CREATE INDEX` covers **one column**. A name between
|
|
`INDEX` and `ON` names the index, where the deployment's configuration allows
|
|
it; without one, the server names it after the column, as in `title_idx`. For a
|
|
multi-column index, use the SDK's [`create_index`](/indexing).
|
|
</Note>
|
|
|
|
<Note>
|
|
**Enterprise job type:** `reindex_` followed by the algorithm, such as
|
|
`reindex_btree` or `reindex_ivf_pq`; the name says which algorithm is building,
|
|
not a different feature. An SDK build that must not replace an existing index
|
|
runs as `create_` followed by the algorithm instead. See
|
|
[Build & Repair](/indexing/reindexing).
|
|
</Note>
|
|
|
|
## DROP INDEX {#drop}
|
|
|
|
```sql
|
|
DROP INDEX documents.title_idx
|
|
```
|
|
|
|
Takes the qualified `table.index` name. Find it with the SDK's
|
|
[`list_indices`](/indexing) if you created the index without
|
|
naming it yourself. A deployment builds the index in the background after
|
|
`CREATE INDEX` returns; until that build finishes, the index is not listed and
|
|
`DROP INDEX` reports it as not found.
|
|
|
|
## What to read next {#next}
|
|
|
|
<CardGroup cols={2}>
|
|
<Card title="Indexing" icon="bolt" href="/indexing">
|
|
Choosing an index type from the SDK.
|
|
</Card>
|
|
<Card title="Build & Repair" icon="refresh" href="/indexing/reindexing">
|
|
Keeping an index current as data arrives.
|
|
</Card>
|
|
</CardGroup>
|