add index on invite_email to members
What does this MR do?
It creates an index on invite_email on members table to speed up query
SELECT "members".\* FROM "members"
WHERE "members"."invite_email"
IN (?, ?) AND ("members"."invite_token"
IS NOT NULL)
it improves the execution time from 4,226.324 ms to 0.053 ms
Before the migration execution plan: https://explain.depesz.com/s/oFFy
after the migration execution plan: https://explain.depesz.com/s/HhvS
Database checklist
-
Conforms to the database guides
When adding migrations:
-
Updated db/schema.rb
-
Added a down
method so the migration can be reverted -
Added the output of the migration(s) to the MR body -
Added tests for the migration in spec/migrations
if necessary (e.g. when migrating data)
When adding or modifying queries to improve performance:
-
Included data that shows the performance improvement, preferably in the form of a benchmark -
Included the output of EXPLAIN (ANALYZE, BUFFERS)
of the relevant queries
When adding foreign keys to existing tables:
-
Included a migration to remove orphaned rows in the source table before adding the foreign key -
Removed any instances of dependent: ...
that may no longer be necessary
When adding tables:
-
Ordered columns based on the Ordering Table Columns guidelines -
Added foreign keys to any columns pointing to data in other tables -
Added indexes for fields that are used in statements such as WHERE, ORDER BY, GROUP BY, and JOINs
When removing columns, tables, indexes or other structures:
-
Removed these in a post-deployment migration -
Made sure the application no longer uses (or ignores) these structures
General checklist
-
Changelog entry added, if necessary -
Documentation created/updated -
Tests added for this feature/bug -
Conforms to the code review guidelines -
Conforms to the merge request performance guidelines -
Conforms to the style guides
Edited by yun guo