Add unique index for note_id to system note metadata table
In issue 1, the sequential scan was taking 250+ ms.
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---
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title: Add unique index for notes_id to system note metadata table
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merge_request:
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author:
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class AddIndexToSystemNoteMetadata < ActiveRecord::Migration
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include Gitlab::Database::MigrationHelpers
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# Set this constant to true if this migration requires downtime.
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DOWNTIME = false
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disable_ddl_transaction!
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def up
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# MySQL automatically creates an index on a foreign-key constraint; PostgreSQL does not
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add_concurrent_index :system_note_metadata, :note_id, unique: true if Gitlab::Database.postgresql?
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end
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def down
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remove_concurrent_index :system_note_metadata, :note_id, unique: true if Gitlab::Database.postgresql?
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end
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end
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@ -11,7 +11,7 @@
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#
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# It's strongly recommended that you check this file into your version control system.
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ActiveRecord::Schema.define(version: 20170418103908) do
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ActiveRecord::Schema.define(version: 20170419001229) do
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# These are extensions that must be enabled in order to support this database
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enable_extension "plpgsql"
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@ -1140,6 +1140,8 @@ ActiveRecord::Schema.define(version: 20170418103908) do
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t.datetime "updated_at", null: false
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end
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add_index "system_note_metadata", ["note_id"], name: "index_system_note_metadata_on_note_id", unique: true, using: :btree
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create_table "taggings", force: :cascade do |t|
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t.integer "tag_id"
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t.integer "taggable_id"
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