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Faster count queries when updating the info about current node

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MySQL optimiser seems to prefer a full table scan of `post-user`
table in the count query mentioned in issue #14763. When the origin
and deleted columns are added to the index, the IN-query part of
the query can be done with index-only scan, which is much faster.

Adding the columns in the order

    uri-id, origin, deleted

allows some other queries to also use it when checking
for uri-id and origin.

Fixes #14763
This commit is contained in:
Esko Arajärvi 2025-02-04 18:46:06 +02:00
parent edbf86449d
commit 25bb9b12c1
3 changed files with 29 additions and 29 deletions
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50
doc/database/db_post-user.md
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@ -44,31 +44,31 @@ Fields
Indexes
------------
| Name | Fields |
| -------------------- | ----------------------- |
| PRIMARY | id |
| uid_uri-id | UNIQUE, uid, uri-id |
| uri-id | uri-id |
| parent-uri-id | parent-uri-id |
| thr-parent-id | thr-parent-id |
| external-id | external-id |
| replies-id | replies-id |
| owner-id | owner-id |
| author-id | author-id |
| causer-id | causer-id |
| vid | vid |
| contact-id | contact-id |
| event-id | event-id |
| psid | psid |
| author-id_uid | author-id, uid |
| author-id_created | author-id, created |
| owner-id_created | owner-id, created |
| parent-uri-id_uid | parent-uri-id, uid |
| uid_wall_received | uid, wall, received |
| uid_contactid | uid, contact-id |
| uid_unseen_contactid | uid, unseen, contact-id |
| uid_unseen | uid, unseen |
| uid_hidden_uri-id | uid, hidden, uri-id |
| Name | Fields |
|-----------------------| ----------------------- |
| PRIMARY | id |
| uid_uri-id | UNIQUE, uid, uri-id |
| uri-id_origin_deleted | uri-id, origin, deleted |
| parent-uri-id | parent-uri-id |
| thr-parent-id | thr-parent-id |
| external-id | external-id |
| replies-id | replies-id |
| owner-id | owner-id |
| author-id | author-id |
| causer-id | causer-id |
| vid | vid |
| contact-id | contact-id |
| event-id | event-id |
| psid | psid |
| author-id_uid | author-id, uid |
| author-id_created | author-id, created |
| owner-id_created | owner-id, created |
| parent-uri-id_uid | parent-uri-id, uid |
| uid_wall_received | uid, wall, received |
| uid_contactid | uid, contact-id |
| uid_unseen_contactid | uid, unseen, contact-id |
| uid_unseen | uid, unseen |
| uid_hidden_uri-id | uid, hidden, uri-id |
Foreign Keys
------------