From c3b7120042af5fb2345b6efd315954deb698b4c0 Mon Sep 17 00:00:00 2001 From: Giteabot Date: Thu, 21 Sep 2023 11:42:34 +0800 Subject: [PATCH] Add index to `issue_user.issue_id` (#27154) (#27158) Backport #27154 by @JakobDev This fixes a performance bottleneck. It was discovered by Codeberg. Every where query on that table (which has grown big over time) uses this column, but there is no index on it. See this part of the log which was posted on Matrix: ``` 2023/09/10 00:52:01 ...rs/web/repo/issue.go:1446:ViewIssue() [W] [Slow SQL Query] UPDATE `issue_user` SET is_read=? WHERE uid=? AND issue_id=? [true x y] - 51.395434887s 2023/09/10 00:52:01 ...rs/web/repo/issue.go:1447:ViewIssue() [E] ReadBy: Error 1205 (HY000): Lock wait timeout exceeded; try restarting transaction 2023/09/10 00:52:01 ...eb/routing/logger.go:102:func1() [I] router: completed GET /Codeberg/Community/issues/1201 for [::ffff:xxx]:0, 500 Internal Server Error in 52384.2ms @ repo/issue.go:1256(repo.ViewIssue) ``` Co-authored-by: JakobDev --- models/issues/issue_user.go | 2 +- models/migrations/migrations.go | 2 ++ models/migrations/v1_21/v277.go | 16 ++++++++++++++++ 3 files changed, 19 insertions(+), 1 deletion(-) create mode 100644 models/migrations/v1_21/v277.go diff --git a/models/issues/issue_user.go b/models/issues/issue_user.go index d053b1d543..24bb74648d 100644 --- a/models/issues/issue_user.go +++ b/models/issues/issue_user.go @@ -15,7 +15,7 @@ import ( type IssueUser struct { ID int64 `xorm:"pk autoincr"` UID int64 `xorm:"INDEX"` // User ID. - IssueID int64 + IssueID int64 `xorm:"INDEX"` IsRead bool IsMentioned bool } diff --git a/models/migrations/migrations.go b/models/migrations/migrations.go index 3524077ea4..38fff37bed 100644 --- a/models/migrations/migrations.go +++ b/models/migrations/migrations.go @@ -534,6 +534,8 @@ var migrations = []Migration{ NewMigration("Add ScheduleID for ActionRun", v1_21.AddScheduleIDForActionRun), // v276 -> v277 NewMigration("Add RemoteAddress to mirrors", v1_21.AddRemoteAddressToMirrors), + // v277 -> v278 + NewMigration("Add Index to issue_user.issue_id", v1_21.AddIndexToIssueUserIssueID), } // GetCurrentDBVersion returns the current db version diff --git a/models/migrations/v1_21/v277.go b/models/migrations/v1_21/v277.go new file mode 100644 index 0000000000..12529160b7 --- /dev/null +++ b/models/migrations/v1_21/v277.go @@ -0,0 +1,16 @@ +// Copyright 2023 The Gitea Authors. All rights reserved. +// SPDX-License-Identifier: MIT + +package v1_21 //nolint + +import ( + "xorm.io/xorm" +) + +func AddIndexToIssueUserIssueID(x *xorm.Engine) error { + type IssueUser struct { + IssueID int64 `xorm:"INDEX"` + } + + return x.Sync(new(IssueUser)) +}