issues: 777392020
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| id | node_id | number | title | user | state | locked | assignee | milestone | comments | created_at | updated_at | closed_at | author_association | pull_request | body | repo | type | active_lock_reason | performed_via_github_app | reactions | draft | state_reason |
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| 777392020 | MDU6SXNzdWU3NzczOTIwMjA= | 212 | Mechanism for maintaining cache of table counts using triggers | 9599 | closed | 0 | 1 | 2021-01-02T02:58:53Z | 2021-01-02T21:40:27Z | 2021-01-02T21:40:27Z | OWNER | Counting all of the rows in a large table is expensive - this is one of the main causes of performance problems in Datasette when running against large databases. Carefully constructed SQL triggers could be used to maintain accurate cached counts for a table, by incrementing and decrementing a counter every time a row is inserted or deleted. `sqlite-utils` already has a mechanism for creating triggers for FTS - the `table.enable_fts(..., create_triggers=True)` method. How about a similar mechanism for setting up triggers to maintain a count of table rows? | 140912432 | issue | {"url": "https://api.github.com/repos/simonw/sqlite-utils/issues/212/reactions", "total_count": 0, "+1": 0, "-1": 0, "laugh": 0, "hooray": 0, "confused": 0, "heart": 0, "rocket": 0, "eyes": 0} | completed |