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gitlab-org--gitlab-foss/db/migrate/20181005110927_add_index_to...

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Enhance performance of counting local LFS objects Add an index to the `file_store` column on `lfs_objects`. This makes counting local objects faster. Also, there is no longer need to check for objects with `file_store` being `NULL`. See https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/18557 --- ### Query plans #### Before & with `NULL` ``` Aggregate (cost=113495.96..113495.97 rows=1 width=8) (actual time=1691.394..1691.394 rows=1 loops=1) -> Seq Scan on lfs_objects (cost=0.00..106415.50 rows=2832186 width=0) (actual time=0.012..1312.488 rows=2852607 loops=1) Filter: ((file_store = 1) OR (file_store IS NULL)) Rows Removed by Filter: 131 Planning time: 0.077 ms Execution time: 1691.433 ms ``` #### Before, without `NULL` ``` Aggregate (cost=113495.96..113495.97 rows=1 width=8) (actual time=856.423..856.424 rows=1 loops=1) -> Seq Scan on lfs_objects (cost=0.00..106415.50 rows=2832186 width=0) (actual time=0.012..672.181 rows=2852607 loops=1) Filter: (file_store = 1) Rows Removed by Filter: 131 Planning time: 0.128 ms Execution time: 856.470 ms ``` #### After & with `NULL` ``` Aggregate (cost=68819.95..68819.96 rows=1 width=8) (actual time=583.355..583.355 rows=1 loops=1) -> Index Only Scan using index_lfs_objects_on_file_store on lfs_objects (cost=0.43..61688.35 rows=2852643 width=0) (actual time=0.028..399.177 rows=2852607 loops=1) Filter: ((file_store = 1) OR (file_store IS NULL)) Rows Removed by Filter: 131 Heap Fetches: 867 Planning time: 0.096 ms Execution time: 583.404 ms ``` #### After, without `NULL` ``` Aggregate (cost=68817.29..68817.30 rows=1 width=8) (actual time=490.550..490.551 rows=1 loops=1) -> Index Only Scan using index_lfs_objects_on_file_store on lfs_objects (cost=0.43..61685.68 rows=2852643 width=0) (actual time=0.040..311.760 rows=2852607 loops=1) Index Cond: (file_store = 1) Heap Fetches: 831 Planning time: 0.294 ms Execution time: 490.590 ms ``` Closes https://gitlab.com/gitlab-org/gitlab-ee/issues/6067
2018-10-05 12:20:12 +00:00
# frozen_string_literal: true
Add version 4.2 to all existing migrations DB schema generated by a migration may look different in rails 4 and 5 (because rails 5 may use different default values). For this reason it's important to explicitly set for which rails version a migration was written for. See https://stackoverflow.com/questions/35929869/activerecordmigration-deprecation-warning-asks-for-rails-version-but-im-no/35930912#35930912
2018-11-13 07:27:31 +00:00
class AddIndexToLfsObjectsFileStore < ActiveRecord::Migration[4.2]
Enhance performance of counting local LFS objects Add an index to the `file_store` column on `lfs_objects`. This makes counting local objects faster. Also, there is no longer need to check for objects with `file_store` being `NULL`. See https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/18557 --- ### Query plans #### Before & with `NULL` ``` Aggregate (cost=113495.96..113495.97 rows=1 width=8) (actual time=1691.394..1691.394 rows=1 loops=1) -> Seq Scan on lfs_objects (cost=0.00..106415.50 rows=2832186 width=0) (actual time=0.012..1312.488 rows=2852607 loops=1) Filter: ((file_store = 1) OR (file_store IS NULL)) Rows Removed by Filter: 131 Planning time: 0.077 ms Execution time: 1691.433 ms ``` #### Before, without `NULL` ``` Aggregate (cost=113495.96..113495.97 rows=1 width=8) (actual time=856.423..856.424 rows=1 loops=1) -> Seq Scan on lfs_objects (cost=0.00..106415.50 rows=2832186 width=0) (actual time=0.012..672.181 rows=2852607 loops=1) Filter: (file_store = 1) Rows Removed by Filter: 131 Planning time: 0.128 ms Execution time: 856.470 ms ``` #### After & with `NULL` ``` Aggregate (cost=68819.95..68819.96 rows=1 width=8) (actual time=583.355..583.355 rows=1 loops=1) -> Index Only Scan using index_lfs_objects_on_file_store on lfs_objects (cost=0.43..61688.35 rows=2852643 width=0) (actual time=0.028..399.177 rows=2852607 loops=1) Filter: ((file_store = 1) OR (file_store IS NULL)) Rows Removed by Filter: 131 Heap Fetches: 867 Planning time: 0.096 ms Execution time: 583.404 ms ``` #### After, without `NULL` ``` Aggregate (cost=68817.29..68817.30 rows=1 width=8) (actual time=490.550..490.551 rows=1 loops=1) -> Index Only Scan using index_lfs_objects_on_file_store on lfs_objects (cost=0.43..61685.68 rows=2852643 width=0) (actual time=0.040..311.760 rows=2852607 loops=1) Index Cond: (file_store = 1) Heap Fetches: 831 Planning time: 0.294 ms Execution time: 490.590 ms ``` Closes https://gitlab.com/gitlab-org/gitlab-ee/issues/6067
2018-10-05 12:20:12 +00:00
include Gitlab::Database::MigrationHelpers
DOWNTIME = false
disable_ddl_transaction!
def up
add_concurrent_index :lfs_objects, :file_store
end
def down
remove_concurrent_index :lfs_objects, :file_store
end
end