forked from treehouse/mastodon
Merge indexes for reblog on statuses table (#5831)
We added an index for `[account_id, reblog_of_id]`, but we already have a similar index for `reblog_of_id`. Those index will be bigger according to statuses count. For example, `reblog_of_id` index uses 800MB for 10GB statuses table. So this patch swaps indexed columns like `[reblog_of_id, account_id]`, then it will covers both usage with single index. Since those index creation may take a while, I've also disabled previous index creation.rebase/4.0.0rc2
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@ -1,6 +1,12 @@
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class AddIndexAccountAndReblogOfIdToStatuses < ActiveRecord::Migration[5.1]
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class AddIndexAccountAndReblogOfIdToStatuses < ActiveRecord::Migration[5.1]
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def change
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disable_ddl_transaction!
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commit_db_transaction
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add_index :statuses, [:account_id, :reblog_of_id], algorithm: :concurrently
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def up
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# This index has been superseded by migration 20171125185353
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# add_index :statuses, [:account_id, :reblog_of_id], algorithm: :concurrently
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end
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def down
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remove_index :statuses, [:account_id, :reblog_of_id] if index_exists?(:statuses, [:account_id, :reblog_of_id])
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end
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end
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end
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end
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@ -0,0 +1,7 @@
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class AddIndexReblogOfIdAndAccountToStatuses < ActiveRecord::Migration[5.1]
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disable_ddl_transaction!
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def change
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add_index :statuses, [:reblog_of_id, :account_id], algorithm: :concurrently
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end
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end
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@ -0,0 +1,14 @@
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class RemoveOldReblogIndexOnStatuses < ActiveRecord::Migration[5.1]
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disable_ddl_transaction!
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def up
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# This index may not exists (see migration 20171122120436)
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remove_index :statuses, [:account_id, :reblog_of_id] if index_exists?(:statuses, [:account_id, :reblog_of_id])
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remove_index :statuses, :reblog_of_id
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end
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def down
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add_index :statuses, :reblog_of_id, algorithm: :concurrently
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end
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end
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@ -10,7 +10,7 @@
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#
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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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# It's strongly recommended that you check this file into your version control system.
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ActiveRecord::Schema.define(version: 20171125031751) do
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ActiveRecord::Schema.define(version: 20171125190735) do
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# These are extensions that must be enabled in order to support this database
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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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enable_extension "plpgsql"
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@ -409,10 +409,9 @@ ActiveRecord::Schema.define(version: 20171125031751) do
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t.bigint "application_id"
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t.bigint "application_id"
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t.bigint "in_reply_to_account_id"
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t.bigint "in_reply_to_account_id"
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t.index ["account_id", "id"], name: "index_statuses_on_account_id_id"
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t.index ["account_id", "id"], name: "index_statuses_on_account_id_id"
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t.index ["account_id", "reblog_of_id"], name: "index_statuses_on_account_id_and_reblog_of_id"
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t.index ["conversation_id"], name: "index_statuses_on_conversation_id"
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t.index ["conversation_id"], name: "index_statuses_on_conversation_id"
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t.index ["in_reply_to_id"], name: "index_statuses_on_in_reply_to_id"
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t.index ["in_reply_to_id"], name: "index_statuses_on_in_reply_to_id"
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t.index ["reblog_of_id"], name: "index_statuses_on_reblog_of_id"
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t.index ["reblog_of_id", "account_id"], name: "index_statuses_on_reblog_of_id_and_account_id"
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t.index ["uri"], name: "index_statuses_on_uri", unique: true
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t.index ["uri"], name: "index_statuses_on_uri", unique: true
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end
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end
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