Mysql Error 40001
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Deadlock Found When Trying To Get Lock Try Restarting Transaction Mysql
a community of 6.2 million programmers, just like you, helping each other. Join them; it only takes a minute: Sign up Mysql - Serialization failure: 1213 Deadlock found when try to get lock; try restarting http://dev.mysql.com/doc/en/error-messages-server.html transaction up vote 0 down vote favorite I have menus, categories and products tables. I am using mysql 5.5, All tables are innoDB and in all cases id is the primary key (int) with autoincrement. menus table id, name, status categories table id, menu_id, name products table id, menu_id, category_id, status, name, url, content Multiple scripts can run in parallel, executing the same php file which contains the following logic. http://stackoverflow.com/questions/35183046/mysql-serialization-failure-1213-deadlock-found-when-try-to-get-lock-try-res START TRANSACTION; SET autocommit = 0; LOCK TABLES products WRITE, categories WRITE, menus WRITE; SELECT p.`id`, p.`name`, p.`url`, p.`status`, c.`id` cat_id, c.`name` cat_name, m.`id` `menu_id`, m.`name` menu_name FROM products p LEFT JOIN categories c ON p.`subcategory_id` = c.`id` LEFT JOIN menus m ON p.`menu_id` = m.`id` WHERE p.`status` = 0 LIMIT 1 if after select result is found, it's status is updated to 1 (otherwise I rollback and release the locks) UPDATE products SET status = 1 WHERE id = [product_id]; if the last query is successful I run COMMIT(); UNLOCK TABLES; otherwise ROLLBACK(); UNLOCK TABLES; After this the script is making a curl request to that products' url to get some content from it and to update the product's row accordingly // making curl request (might take a few dozen seconds, because proxy is being used and sometimes because of proxy failure the request is attempted again) trying to update the products table UPDATE products SET content = [received content], status = 2 WHERE id = [product_id] So, the script is acquiring X lock on the mentioned tables, fetching one row from products table that has status of 0 (means - TODO), trying to set its status to 1 (means PENDING), and unlocks the tables. After th
that make connections all over the world. Join today Download & Extend Drupal Core Distributions Modules Themes Issues DEADLOCK errors on MergeQuery https://www.drupal.org/node/937284 INSERT due to InnoDB gap locking when condition in SELECT ... FOR UPDATE results in 0 rows Closed (fixed)Project:Drupal coreVersion:7.x-devComponent:database systemPriority:CriticalCategory:Bug reportAssigned:UnassignedIssue tags:needs backport to D77.25 release notesneeds backport http://alpha.mixi.co.jp/entry/2007/10681/ to D6Reporter:hefoxCreated:October 10, 2010 - 07:51Updated:August 24, 2015 - 20:43 Log in or register to update this issue Jump to:Most recent comment Most recent attachment SQLSTATE[40001]: Serialization failure: mysql error 1213 Deadlock found when trying to get lock; try restarting transactionSQLSTATE[40001]: Serialization failure: 1213 Deadlock found when trying to get lock; try restarting transaction And going to repeat the unique part SQLSTATE[40001]: Serialization failure: 1213 Deadlock found when trying to get lock; try restarting transaction Re-installed but wasn't able to reproduce the error, was going to test if mysql error code #926426: system_check_http_request() causes deadlock on single threaded webserver was related >.O. PHP: 5.2.5, www.entropy.ch Release 6 Mysql: 5.0.88 (Apache, os-x or whatever this mac's operating system is)Files: CommentFileSizeAuthor #90 resolve_merge_deadlock-937284-90.patch3.51 KBchrisdolby PASSED: [[SimpleTest]]: [MySQL] 40,452 pass(es). View #65 937284.65-deadlock-merge.patch3.54 KBdeviantintegral PASSED: [[SimpleTest]]: [MySQL] 39,677 pass(es). View #63 deadlock-merge-937284-63.patch6.32 KBBerdir PASSED: [[SimpleTest]]: [MySQL] 49,361 pass(es). View #63 deadlock-merge-937284-63-interdiff.txt566 bytesBerdir #59 937284_59.patch6.27 KBchx FAILED: [[SimpleTest]]: [MySQL] Unable to apply patch 937284_59.patch. Unable to apply patch. See the log in the details link for more information. View #56 deadlock-937284-56.patch4.96 KBtim.plunkett FAILED: [[SimpleTest]]: [MySQL] 49,181 pass(es), 102 fail(s), and 16 exception(s). View #51 937284_51-do-not-test.patch1.39 KBchx #51 937284_51.patch3.78 KBchx FAILED: [[SimpleTest]]: [MySQL] 49,320 pass(es), 1 fail(s), and 0 exception(s). View #46 937284_46.patch654 byteschx FAILED: [[SimpleTest]]: [MySQL] 48,629 pass(es), 7 fail(s), and 0 exception(s). View #43 937284_43.patch624 byteschx PASSED: [[SimpleTest]]: [MySQL] 39,648 pass(es). View #39 937284_39.patch824 byteschx PASSED: [[SimpleTest]]: [MySQL] 49,299 pass(es). View #37 937284_36.patch824 byteschx FAILED: [[SimpleTest]]: [MySQL] Invalid PHP syntax in core/lib/Drupal/Core/Database/Driver/mysql/Connection.php. View #35 937284_35.patch843 byteschx FAILED: [[SimpleTest]]: [MySQL] Invalid PHP syntax in core/l
限定公開記事のため引用できません。 読者です 読者をやめる 読者になる 読者になる mixi engineer blog ミクシィ・グループで、実際に開発に携わっているエンジニア達が執筆している公式ブログです。様々なサービスの開発や運用を行っていく際に得た技術情報から採用情報まで、有益な情報を幅広く取り扱っています。 2007-11-27 MySQLのInnoDBでのデッドロック mixi MySQL こんにちは、mixi開発部にてアプリケーション開発をしていますyouheiです。 今回は、MySQL-5.0.45のInnoDBで連番を管理するテーブルのパフォーマンス測定をしていたのですが、その際に少し変わったデッドロック問題に遭遇しましたので、そのあたりをネタとして書いてみたいと思います。 まずは、今回使用したデータベースのスキーマは下記のようなものです。 CREATE TABLE num ( id bigint unsigned NOT NULL default '0' ) Engine=InnoDB; AUTO_INCREMENTは使用していません。 そこに1レコードだけ登録します。 INSERT INTO num (id) values (1); そして実際連番を取得する際には、 UPDATE num SET id = LAST_INSERT_ID(id+1); といったクエリを発行しインクリメントしていき、最新のidはSELECTするのではなくUPDATE時のMySQL応答パケットに含まれるmysql_insertidを参照します。 上記のような内容をベンチマークテストのために同時接続を増やしながらテストしていると、350を超えたあたりで ERROR 1213 (40001): Deadlock found when trying to get lock というエラーが発生するという事態に遭遇しました(350という具体的な数値はハードウェアの性能などで変動すると思います)。ちなみに試験環境のOSやMySQLのバージョンは簡単ですが下記のような感じです。 MySQL-5.0.45 Linux-2.6.22 まずはWebで検索してみる 筆者の英語力不足という説もありますが、なかなか「コレ!」というものが見つけられませんでした。 パラメータやSQL文等を色々試してみる 1カラムしかないのが逆に良くないのかと思い、主キーカラムを追加しWhere句で指定 → 変化なし autocommitなのが良くないのかと思い、start transaction(またはbegin)とcommitを発行する →