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| author | Stan Hu <stanhu@gmail.com> | 2017-02-04 10:20:39 -0800 |
|---|---|---|
| committer | Stan Hu <stanhu@gmail.com> | 2017-02-04 10:22:32 -0800 |
| commit | 1e97a6df24f66f70811fdd4b1412432e40ab8ebe (patch) | |
| tree | 94dbb71bf6e0c8c8ec5a2a2adeefd4a5787c7329 | |
| parent | 8a333d45059688bfd5245eb91f206bbbcf7d18eb (diff) | |
| download | gitlab-ce-sh-add-index-for-label-count.tar.gz | |
Add index to labels for `type` and project_id`sh-add-index-for-label-count
When loading pages that display the number of open issues,
the backend runs a query such as:
```sql
SELECT "labels"."id" FROM "labels" WHERE "labels"."type" IN ('ProjectLabel') AND "labels"."project_id" = 1000
```
This results in an entire scan of the `labels` table. To optimize performance,
add the appropriate index to the table.
Closes #27676
| -rw-r--r-- | db/migrate/20170204181513_add_index_to_labels_for_type_and_project.rb | 11 | ||||
| -rw-r--r-- | db/schema.rb | 3 |
2 files changed, 13 insertions, 1 deletions
diff --git a/db/migrate/20170204181513_add_index_to_labels_for_type_and_project.rb b/db/migrate/20170204181513_add_index_to_labels_for_type_and_project.rb new file mode 100644 index 00000000000..8f944930807 --- /dev/null +++ b/db/migrate/20170204181513_add_index_to_labels_for_type_and_project.rb @@ -0,0 +1,11 @@ +class AddIndexToLabelsForTypeAndProject < ActiveRecord::Migration + include Gitlab::Database::MigrationHelpers + + DOWNTIME = false + + disable_ddl_transaction! + + def change + add_concurrent_index :labels, [:type, :project_id] + end +end diff --git a/db/schema.rb b/db/schema.rb index c73c311ccb2..92b36218a15 100644 --- a/db/schema.rb +++ b/db/schema.rb @@ -11,7 +11,7 @@ # # It's strongly recommended that you check this file into your version control system. -ActiveRecord::Schema.define(version: 20170130204620) do +ActiveRecord::Schema.define(version: 20170204181513) do # These are extensions that must be enabled in order to support this database enable_extension "plpgsql" @@ -576,6 +576,7 @@ ActiveRecord::Schema.define(version: 20170130204620) do end add_index "labels", ["group_id", "project_id", "title"], name: "index_labels_on_group_id_and_project_id_and_title", unique: true, using: :btree + add_index "labels", ["type", "project_id"], name: "index_labels_on_type_and_project_id", using: :btree create_table "lfs_objects", force: :cascade do |t| t.string "oid", null: false |