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Analyze user_ips before running deduplication

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Due to the table locks taken out by the naive upsert, the table
statistics may be out of date. During deduplication it is important that
the correct index is used as otherwise a full table scan may be
incorrectly used, which can end up thrashing the database badly.
This commit is contained in:
Erik Johnston 2019-02-12 11:55:27 +00:00
parent 46b8a79b3a
commit 483ba85c7a
2 changed files with 31 additions and 3 deletions
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10
synapse/storage/schema/delta/53/user_ips_index.sql
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@ -13,9 +13,13 @@
* limitations under the License.
*/
-- delete duplicates
-- analyze user_ips, to help ensure the correct indices are used
INSERT INTO background_updates (update_name, progress_json) VALUES
('user_ips_remove_dupes', '{}');
('user_ips_analyze', '{}');
-- delete duplicates
INSERT INTO background_updates (update_name, progress_json, depends_on) VALUES
('user_ips_remove_dupes', '{}', 'user_ips_analyze');
-- add a new unique index to user_ips table
INSERT INTO background_updates (update_name, progress_json, depends_on) VALUES
@ -23,4 +27,4 @@ INSERT INTO background_updates (update_name, progress_json, depends_on) VALUES
-- drop the old original index
INSERT INTO background_updates (update_name, progress_json, depends_on) VALUES
('user_ips_drop_nonunique_index', '{}', 'user_ips_device_unique_index');
('user_ips_drop_nonunique_index', '{}', 'user_ips_device_unique_index');