Remove various redundant indexes
One can see which indexes are used in PostgreSQL by running the
following query:
SELECT relname as table_name, indexrelname as index_name, idx_scan, idx_tup_read, idx_tup_fetch, pg_size_pretty(pg_relation_size(indexrelname::regclass))
FROM pg_stat_all_indexes
WHERE schemaname = 'public'
AND "idx_scan" = 0
ORDER BY pg_relation_size(indexrelname::regclass) desc;
Using this query I built a list of indexes that could be potentially
removed. After checking every single one by hand to make sure they
really aren't used I only found 1 index that _would_ be used. This was a
GitLab GEO index (EE) specific that's currently not used simply because
the table is empty.
Apart from this one index all indexes could be removed. The migration
also takes care of 6 composite indexes that can be replaced with a
single column index, which in most cases was already present.
For more information see gitlab-org/gitlab-ce#20767.
This commit is contained in:
Yorick Peterse
parent
3a46eac1ef
commit
7d39bc879d
3 changed files with 117 additions and 52 deletions
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@ -26,6 +26,7 @@ v 8.11.0 (unreleased)
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- Add experimental Redis Sentinel support !1877
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- Fix branches page dropdown sort initial state (ClemMakesApps)
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- Environments have an url to link to
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- Various redundant database indexes have been removed
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- Update `timeago` plugin to use multiple string/locale settings
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- Remove unused images (ClemMakesApps)
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- Limit git rev-list output count to one in forced push check
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112
db/migrate/20160810142633_remove_redundant_indexes.rb
Normal file
112
db/migrate/20160810142633_remove_redundant_indexes.rb
Normal file
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@ -0,0 +1,112 @@
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# See http://doc.gitlab.com/ce/development/migration_style_guide.html
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# for more information on how to write migrations for GitLab.
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class RemoveRedundantIndexes < ActiveRecord::Migration
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include Gitlab::Database::MigrationHelpers
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DOWNTIME = false
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disable_ddl_transaction!
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def up
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indexes = [
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[:ci_taggings, 'ci_taggings_idx'],
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[:audit_events, 'index_audit_events_on_author_id'],
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[:audit_events, 'index_audit_events_on_type'],
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[:ci_builds, 'index_ci_builds_on_erased_by_id'],
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[:ci_builds, 'index_ci_builds_on_project_id_and_commit_id'],
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[:ci_builds, 'index_ci_builds_on_type'],
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[:ci_commits, 'index_ci_commits_on_project_id'],
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[:ci_commits, 'index_ci_commits_on_project_id_and_committed_at'],
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[:ci_commits, 'index_ci_commits_on_project_id_and_committed_at_and_id'],
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[:ci_commits, 'index_ci_commits_on_project_id_and_sha'],
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[:ci_commits, 'index_ci_commits_on_sha'],
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[:ci_events, 'index_ci_events_on_created_at'],
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[:ci_events, 'index_ci_events_on_is_admin'],
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[:ci_events, 'index_ci_events_on_project_id'],
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[:ci_jobs, 'index_ci_jobs_on_deleted_at'],
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[:ci_jobs, 'index_ci_jobs_on_project_id'],
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[:ci_projects, 'index_ci_projects_on_gitlab_id'],
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[:ci_projects, 'index_ci_projects_on_shared_runners_enabled'],
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[:ci_services, 'index_ci_services_on_project_id'],
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[:ci_sessions, 'index_ci_sessions_on_session_id'],
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[:ci_sessions, 'index_ci_sessions_on_updated_at'],
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[:ci_tags, 'index_ci_tags_on_name'],
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[:ci_triggers, 'index_ci_triggers_on_deleted_at'],
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[:identities, 'index_identities_on_created_at_and_id'],
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[:issues, 'index_issues_on_title'],
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[:keys, 'index_keys_on_created_at_and_id'],
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[:members, 'index_members_on_created_at_and_id'],
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[:members, 'index_members_on_type'],
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[:milestones, 'index_milestones_on_created_at_and_id'],
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[:namespaces, 'index_namespaces_on_visibility_level'],
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[:projects, 'index_projects_on_builds_enabled_and_shared_runners_enabled'],
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[:services, 'index_services_on_category'],
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[:services, 'index_services_on_created_at_and_id'],
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[:services, 'index_services_on_default'],
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[:snippets, 'index_snippets_on_created_at'],
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[:snippets, 'index_snippets_on_created_at_and_id'],
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[:todos, 'index_todos_on_state'],
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[:web_hooks, 'index_web_hooks_on_created_at_and_id'],
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# These indexes _may_ be used but they can be replaced by other existing
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# indexes.
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# There's already a composite index on (project_id, iid) which means that
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# a separate index for _just_ project_id is not needed.
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[:issues, 'index_issues_on_project_id'],
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# These are all composite indexes for the columns (created_at, id). In all
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# these cases there's already a standalone index for "created_at" which
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# can be used instead.
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#
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# Because the "id" column of these composite indexes is never needed (due
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# to "id" already being indexed as its a primary key) these composite
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# indexes are useless.
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[:issues, 'index_issues_on_created_at_and_id'],
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[:merge_requests, 'index_merge_requests_on_created_at_and_id'],
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[:namespaces, 'index_namespaces_on_created_at_and_id'],
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[:notes, 'index_notes_on_created_at_and_id'],
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[:projects, 'index_projects_on_created_at_and_id'],
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[:users, 'index_users_on_created_at_and_id'],
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]
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transaction do
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indexes.each do |(table, index)|
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remove_index(table, name: index) if index_exists_by_name?(table, index)
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end
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end
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add_concurrent_index(:users, :created_at)
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add_concurrent_index(:projects, :created_at)
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add_concurrent_index(:namespaces, :created_at)
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end
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def down
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# We're only restoring the composite indexes that could be replaced with
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# individual ones, just in case somebody would ever want to revert.
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transaction do
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remove_index(:users, :created_at)
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remove_index(:projects, :created_at)
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remove_index(:namespaces, :created_at)
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end
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[:issues, :merge_requests, :namespaces, :notes, :projects, :users].each do |table|
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add_concurrent_index(table, [:created_at, :id],
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name: "index_#{table}_on_created_at_and_id")
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end
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end
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# Rails' index_exists? doesn't work when you only give it a table and index
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# name. As such we have to use some extra code to check if an index exists for
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# a given name.
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def index_exists_by_name?(table, index)
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indexes_for_table[table].include?(index)
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end
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def indexes_for_table
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@indexes_for_table ||= Hash.new do |hash, table_name|
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hash[table_name] = indexes(table_name).map(&:name)
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end
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end
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end
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56
db/schema.rb
56
db/schema.rb
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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: 20160810102349) do
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ActiveRecord::Schema.define(version: 20160810142633) 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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@ -102,9 +102,7 @@ ActiveRecord::Schema.define(version: 20160810102349) do
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t.datetime "updated_at"
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end
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add_index "audit_events", ["author_id"], name: "index_audit_events_on_author_id", using: :btree
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add_index "audit_events", ["entity_id", "entity_type"], name: "index_audit_events_on_entity_id_and_entity_type", using: :btree
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add_index "audit_events", ["type"], name: "index_audit_events_on_type", using: :btree
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create_table "award_emoji", force: :cascade do |t|
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t.string "name"
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@ -179,13 +177,10 @@ ActiveRecord::Schema.define(version: 20160810102349) do
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add_index "ci_builds", ["commit_id", "type", "name", "ref"], name: "index_ci_builds_on_commit_id_and_type_and_name_and_ref", using: :btree
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add_index "ci_builds", ["commit_id", "type", "ref"], name: "index_ci_builds_on_commit_id_and_type_and_ref", using: :btree
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add_index "ci_builds", ["commit_id"], name: "index_ci_builds_on_commit_id", using: :btree
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add_index "ci_builds", ["erased_by_id"], name: "index_ci_builds_on_erased_by_id", using: :btree
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add_index "ci_builds", ["gl_project_id"], name: "index_ci_builds_on_gl_project_id", using: :btree
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add_index "ci_builds", ["project_id", "commit_id"], name: "index_ci_builds_on_project_id_and_commit_id", using: :btree
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add_index "ci_builds", ["project_id"], name: "index_ci_builds_on_project_id", using: :btree
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add_index "ci_builds", ["runner_id"], name: "index_ci_builds_on_runner_id", using: :btree
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add_index "ci_builds", ["status"], name: "index_ci_builds_on_status", using: :btree
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add_index "ci_builds", ["type"], name: "index_ci_builds_on_type", using: :btree
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create_table "ci_commits", force: :cascade do |t|
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t.integer "project_id"
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@ -209,11 +204,6 @@ ActiveRecord::Schema.define(version: 20160810102349) do
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add_index "ci_commits", ["gl_project_id", "sha"], name: "index_ci_commits_on_gl_project_id_and_sha", using: :btree
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add_index "ci_commits", ["gl_project_id", "status"], name: "index_ci_commits_on_gl_project_id_and_status", using: :btree
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add_index "ci_commits", ["gl_project_id"], name: "index_ci_commits_on_gl_project_id", using: :btree
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add_index "ci_commits", ["project_id", "committed_at", "id"], name: "index_ci_commits_on_project_id_and_committed_at_and_id", using: :btree
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add_index "ci_commits", ["project_id", "committed_at"], name: "index_ci_commits_on_project_id_and_committed_at", using: :btree
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add_index "ci_commits", ["project_id", "sha"], name: "index_ci_commits_on_project_id_and_sha", using: :btree
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add_index "ci_commits", ["project_id"], name: "index_ci_commits_on_project_id", using: :btree
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add_index "ci_commits", ["sha"], name: "index_ci_commits_on_sha", using: :btree
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add_index "ci_commits", ["status"], name: "index_ci_commits_on_status", using: :btree
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add_index "ci_commits", ["user_id"], name: "index_ci_commits_on_user_id", using: :btree
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@ -226,10 +216,6 @@ ActiveRecord::Schema.define(version: 20160810102349) do
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t.datetime "updated_at"
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end
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add_index "ci_events", ["created_at"], name: "index_ci_events_on_created_at", using: :btree
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add_index "ci_events", ["is_admin"], name: "index_ci_events_on_is_admin", using: :btree
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add_index "ci_events", ["project_id"], name: "index_ci_events_on_project_id", using: :btree
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create_table "ci_jobs", force: :cascade do |t|
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t.integer "project_id", null: false
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t.text "commands"
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@ -244,9 +230,6 @@ ActiveRecord::Schema.define(version: 20160810102349) do
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t.datetime "deleted_at"
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end
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add_index "ci_jobs", ["deleted_at"], name: "index_ci_jobs_on_deleted_at", using: :btree
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add_index "ci_jobs", ["project_id"], name: "index_ci_jobs_on_project_id", using: :btree
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create_table "ci_projects", force: :cascade do |t|
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t.string "name"
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t.integer "timeout", default: 3600, null: false
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@ -270,9 +253,6 @@ ActiveRecord::Schema.define(version: 20160810102349) do
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t.text "generated_yaml_config"
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end
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add_index "ci_projects", ["gitlab_id"], name: "index_ci_projects_on_gitlab_id", using: :btree
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add_index "ci_projects", ["shared_runners_enabled"], name: "index_ci_projects_on_shared_runners_enabled", using: :btree
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create_table "ci_runner_projects", force: :cascade do |t|
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t.integer "runner_id", null: false
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t.integer "project_id"
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@ -314,8 +294,6 @@ ActiveRecord::Schema.define(version: 20160810102349) do
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t.text "properties"
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end
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add_index "ci_services", ["project_id"], name: "index_ci_services_on_project_id", using: :btree
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create_table "ci_sessions", force: :cascade do |t|
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t.string "session_id", null: false
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t.text "data"
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@ -323,9 +301,6 @@ ActiveRecord::Schema.define(version: 20160810102349) do
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t.datetime "updated_at"
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end
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add_index "ci_sessions", ["session_id"], name: "index_ci_sessions_on_session_id", using: :btree
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add_index "ci_sessions", ["updated_at"], name: "index_ci_sessions_on_updated_at", using: :btree
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create_table "ci_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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@ -336,7 +311,6 @@ ActiveRecord::Schema.define(version: 20160810102349) do
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t.datetime "created_at"
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end
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add_index "ci_taggings", ["tag_id", "taggable_id", "taggable_type", "context", "tagger_id", "tagger_type"], name: "ci_taggings_idx", unique: true, using: :btree
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add_index "ci_taggings", ["taggable_id", "taggable_type", "context"], name: "index_ci_taggings_on_taggable_id_and_taggable_type_and_context", using: :btree
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create_table "ci_tags", force: :cascade do |t|
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@ -344,8 +318,6 @@ ActiveRecord::Schema.define(version: 20160810102349) do
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t.integer "taggings_count", default: 0
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end
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add_index "ci_tags", ["name"], name: "index_ci_tags_on_name", unique: true, using: :btree
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create_table "ci_trigger_requests", force: :cascade do |t|
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t.integer "trigger_id", null: false
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t.text "variables"
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@ -363,7 +335,6 @@ ActiveRecord::Schema.define(version: 20160810102349) do
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t.integer "gl_project_id"
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end
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add_index "ci_triggers", ["deleted_at"], name: "index_ci_triggers_on_deleted_at", using: :btree
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add_index "ci_triggers", ["gl_project_id"], name: "index_ci_triggers_on_gl_project_id", using: :btree
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create_table "ci_variables", force: :cascade do |t|
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@ -469,7 +440,6 @@ ActiveRecord::Schema.define(version: 20160810102349) do
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t.datetime "updated_at"
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end
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add_index "identities", ["created_at", "id"], name: "index_identities_on_created_at_and_id", using: :btree
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add_index "identities", ["user_id"], name: "index_identities_on_user_id", using: :btree
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create_table "issues", force: :cascade do |t|
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@ -495,16 +465,13 @@ ActiveRecord::Schema.define(version: 20160810102349) do
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add_index "issues", ["assignee_id"], name: "index_issues_on_assignee_id", using: :btree
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add_index "issues", ["author_id"], name: "index_issues_on_author_id", using: :btree
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add_index "issues", ["confidential"], name: "index_issues_on_confidential", using: :btree
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add_index "issues", ["created_at", "id"], name: "index_issues_on_created_at_and_id", using: :btree
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add_index "issues", ["created_at"], name: "index_issues_on_created_at", using: :btree
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add_index "issues", ["deleted_at"], name: "index_issues_on_deleted_at", using: :btree
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add_index "issues", ["description"], name: "index_issues_on_description_trigram", using: :gin, opclasses: {"description"=>"gin_trgm_ops"}
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add_index "issues", ["due_date"], name: "index_issues_on_due_date", using: :btree
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add_index "issues", ["milestone_id"], name: "index_issues_on_milestone_id", using: :btree
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add_index "issues", ["project_id", "iid"], name: "index_issues_on_project_id_and_iid", unique: true, using: :btree
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add_index "issues", ["project_id"], name: "index_issues_on_project_id", using: :btree
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add_index "issues", ["state"], name: "index_issues_on_state", using: :btree
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add_index "issues", ["title"], name: "index_issues_on_title", using: :btree
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add_index "issues", ["title"], name: "index_issues_on_title_trigram", using: :gin, opclasses: {"title"=>"gin_trgm_ops"}
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create_table "keys", force: :cascade do |t|
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@ -518,7 +485,6 @@ ActiveRecord::Schema.define(version: 20160810102349) do
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t.boolean "public", default: false, null: false
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end
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add_index "keys", ["created_at", "id"], name: "index_keys_on_created_at_and_id", using: :btree
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add_index "keys", ["fingerprint"], name: "index_keys_on_fingerprint", unique: true, using: :btree
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add_index "keys", ["user_id"], name: "index_keys_on_user_id", using: :btree
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@ -583,11 +549,9 @@ ActiveRecord::Schema.define(version: 20160810102349) do
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end
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add_index "members", ["access_level"], name: "index_members_on_access_level", using: :btree
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add_index "members", ["created_at", "id"], name: "index_members_on_created_at_and_id", using: :btree
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add_index "members", ["invite_token"], name: "index_members_on_invite_token", unique: true, using: :btree
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add_index "members", ["requested_at"], name: "index_members_on_requested_at", using: :btree
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add_index "members", ["source_id", "source_type"], name: "index_members_on_source_id_and_source_type", using: :btree
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add_index "members", ["type"], name: "index_members_on_type", using: :btree
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add_index "members", ["user_id"], name: "index_members_on_user_id", using: :btree
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create_table "merge_request_diffs", force: :cascade do |t|
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@ -634,7 +598,6 @@ ActiveRecord::Schema.define(version: 20160810102349) do
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add_index "merge_requests", ["assignee_id"], name: "index_merge_requests_on_assignee_id", using: :btree
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add_index "merge_requests", ["author_id"], name: "index_merge_requests_on_author_id", using: :btree
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add_index "merge_requests", ["created_at", "id"], name: "index_merge_requests_on_created_at_and_id", using: :btree
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add_index "merge_requests", ["created_at"], name: "index_merge_requests_on_created_at", using: :btree
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add_index "merge_requests", ["deleted_at"], name: "index_merge_requests_on_deleted_at", using: :btree
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add_index "merge_requests", ["description"], name: "index_merge_requests_on_description_trigram", using: :gin, opclasses: {"description"=>"gin_trgm_ops"}
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@ -657,7 +620,6 @@ ActiveRecord::Schema.define(version: 20160810102349) do
|
|||
t.integer "iid"
|
||||
end
|
||||
|
||||
add_index "milestones", ["created_at", "id"], name: "index_milestones_on_created_at_and_id", using: :btree
|
||||
add_index "milestones", ["description"], name: "index_milestones_on_description_trigram", using: :gin, opclasses: {"description"=>"gin_trgm_ops"}
|
||||
add_index "milestones", ["due_date"], name: "index_milestones_on_due_date", using: :btree
|
||||
add_index "milestones", ["project_id", "iid"], name: "index_milestones_on_project_id_and_iid", unique: true, using: :btree
|
||||
|
|
@ -679,14 +641,13 @@ ActiveRecord::Schema.define(version: 20160810102349) do
|
|||
t.boolean "request_access_enabled", default: true, null: false
|
||||
end
|
||||
|
||||
add_index "namespaces", ["created_at", "id"], name: "index_namespaces_on_created_at_and_id", using: :btree
|
||||
add_index "namespaces", ["created_at"], name: "index_namespaces_on_created_at", using: :btree
|
||||
add_index "namespaces", ["name"], name: "index_namespaces_on_name", unique: true, using: :btree
|
||||
add_index "namespaces", ["name"], name: "index_namespaces_on_name_trigram", using: :gin, opclasses: {"name"=>"gin_trgm_ops"}
|
||||
add_index "namespaces", ["owner_id"], name: "index_namespaces_on_owner_id", using: :btree
|
||||
add_index "namespaces", ["path"], name: "index_namespaces_on_path", unique: true, using: :btree
|
||||
add_index "namespaces", ["path"], name: "index_namespaces_on_path_trigram", using: :gin, opclasses: {"path"=>"gin_trgm_ops"}
|
||||
add_index "namespaces", ["type"], name: "index_namespaces_on_type", using: :btree
|
||||
add_index "namespaces", ["visibility_level"], name: "index_namespaces_on_visibility_level", using: :btree
|
||||
|
||||
create_table "notes", force: :cascade do |t|
|
||||
t.text "note"
|
||||
|
|
@ -709,7 +670,6 @@ ActiveRecord::Schema.define(version: 20160810102349) do
|
|||
|
||||
add_index "notes", ["author_id"], name: "index_notes_on_author_id", using: :btree
|
||||
add_index "notes", ["commit_id"], name: "index_notes_on_commit_id", using: :btree
|
||||
add_index "notes", ["created_at", "id"], name: "index_notes_on_created_at_and_id", using: :btree
|
||||
add_index "notes", ["created_at"], name: "index_notes_on_created_at", using: :btree
|
||||
add_index "notes", ["line_code"], name: "index_notes_on_line_code", using: :btree
|
||||
add_index "notes", ["note"], name: "index_notes_on_note_trigram", using: :gin, opclasses: {"note"=>"gin_trgm_ops"}
|
||||
|
|
@ -849,9 +809,8 @@ ActiveRecord::Schema.define(version: 20160810102349) do
|
|||
t.boolean "request_access_enabled", default: true, null: false
|
||||
end
|
||||
|
||||
add_index "projects", ["builds_enabled", "shared_runners_enabled"], name: "index_projects_on_builds_enabled_and_shared_runners_enabled", using: :btree
|
||||
add_index "projects", ["ci_id"], name: "index_projects_on_ci_id", using: :btree
|
||||
add_index "projects", ["created_at", "id"], name: "index_projects_on_created_at_and_id", using: :btree
|
||||
add_index "projects", ["created_at"], name: "index_projects_on_created_at", using: :btree
|
||||
add_index "projects", ["creator_id"], name: "index_projects_on_creator_id", using: :btree
|
||||
add_index "projects", ["description"], name: "index_projects_on_description_trigram", using: :gin, opclasses: {"description"=>"gin_trgm_ops"}
|
||||
add_index "projects", ["last_activity_at"], name: "index_projects_on_last_activity_at", using: :btree
|
||||
|
|
@ -937,9 +896,6 @@ ActiveRecord::Schema.define(version: 20160810102349) do
|
|||
t.boolean "wiki_page_events", default: true
|
||||
end
|
||||
|
||||
add_index "services", ["category"], name: "index_services_on_category", using: :btree
|
||||
add_index "services", ["created_at", "id"], name: "index_services_on_created_at_and_id", using: :btree
|
||||
add_index "services", ["default"], name: "index_services_on_default", using: :btree
|
||||
add_index "services", ["project_id"], name: "index_services_on_project_id", using: :btree
|
||||
add_index "services", ["template"], name: "index_services_on_template", using: :btree
|
||||
|
||||
|
|
@ -956,8 +912,6 @@ ActiveRecord::Schema.define(version: 20160810102349) do
|
|||
end
|
||||
|
||||
add_index "snippets", ["author_id"], name: "index_snippets_on_author_id", using: :btree
|
||||
add_index "snippets", ["created_at", "id"], name: "index_snippets_on_created_at_and_id", using: :btree
|
||||
add_index "snippets", ["created_at"], name: "index_snippets_on_created_at", using: :btree
|
||||
add_index "snippets", ["file_name"], name: "index_snippets_on_file_name_trigram", using: :gin, opclasses: {"file_name"=>"gin_trgm_ops"}
|
||||
add_index "snippets", ["project_id"], name: "index_snippets_on_project_id", using: :btree
|
||||
add_index "snippets", ["title"], name: "index_snippets_on_title_trigram", using: :gin, opclasses: {"title"=>"gin_trgm_ops"}
|
||||
|
|
@ -1026,7 +980,6 @@ ActiveRecord::Schema.define(version: 20160810102349) do
|
|||
add_index "todos", ["commit_id"], name: "index_todos_on_commit_id", using: :btree
|
||||
add_index "todos", ["note_id"], name: "index_todos_on_note_id", using: :btree
|
||||
add_index "todos", ["project_id"], name: "index_todos_on_project_id", using: :btree
|
||||
add_index "todos", ["state"], name: "index_todos_on_state", using: :btree
|
||||
add_index "todos", ["target_type", "target_id"], name: "index_todos_on_target_type_and_target_id", using: :btree
|
||||
add_index "todos", ["user_id"], name: "index_todos_on_user_id", using: :btree
|
||||
|
||||
|
|
@ -1106,7 +1059,7 @@ ActiveRecord::Schema.define(version: 20160810102349) do
|
|||
add_index "users", ["admin"], name: "index_users_on_admin", using: :btree
|
||||
add_index "users", ["authentication_token"], name: "index_users_on_authentication_token", unique: true, using: :btree
|
||||
add_index "users", ["confirmation_token"], name: "index_users_on_confirmation_token", unique: true, using: :btree
|
||||
add_index "users", ["created_at", "id"], name: "index_users_on_created_at_and_id", using: :btree
|
||||
add_index "users", ["created_at"], name: "index_users_on_created_at", using: :btree
|
||||
add_index "users", ["current_sign_in_at"], name: "index_users_on_current_sign_in_at", using: :btree
|
||||
add_index "users", ["email"], name: "index_users_on_email", unique: true, using: :btree
|
||||
add_index "users", ["email"], name: "index_users_on_email_trigram", using: :gin, opclasses: {"email"=>"gin_trgm_ops"}
|
||||
|
|
@ -1146,7 +1099,6 @@ ActiveRecord::Schema.define(version: 20160810102349) do
|
|||
t.string "token"
|
||||
end
|
||||
|
||||
add_index "web_hooks", ["created_at", "id"], name: "index_web_hooks_on_created_at_and_id", using: :btree
|
||||
add_index "web_hooks", ["project_id"], name: "index_web_hooks_on_project_id", using: :btree
|
||||
|
||||
add_foreign_key "personal_access_tokens", "users"
|
||||
|
|
|
|||
Loading…
Reference in a new issue