Rollback not working in MySQL

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I have a user table, and I have 5 records.

I deleted two records, then executed the rollback command, it executed successfully.

But that deleted two records not recovered.

The user table engine is InnoDB.

You should be able to rollback your transaction as the table engine is InnoDB.

Anyways here is the correct way to do transactions,

SET autocommit=0;
START TRANSACTION; 
Your Query here.
ROLLBACK;

and make sure that you are not using COMMIT after the Query which you need to rollback. Refer Table Engines and Transaction. And When a DB connection is created, it is in auto-commit mode by default. This means that each individual SQL statement is treated as a transaction and is automatically committed right after it is executed. So if you need to do transactions yourself, you must turn off the autocommit mode by AUTOCOMMIT = 0. Refer this link for more info.

ROLLBACK doesn't work after INSERT INTO newly created , I am working on PHP-script which imports CSV file ( customers.csv ) into MySQL table ( customers ). Before inserting contents of CSV-file into the� MySQL InnoDB transaction rollback is not working I tried setting autoCommit explicitly, with no luck. Checked Mysql general log, only one Connection is being open, with one Start transaction sent, and later only one In the general log, "Start transaction", "rollback" and the update statement were

By default, MySQL starts the session
for each new connection with
autocommit enabled,

You could set autocommit mode disable before running your query

SET autocommit=0;

ref:

Link 1

Link 2

15.7.2.2 autocommit, Commit, and Rollback, a commit after each SQL statement if that statement did not return an error. If a statement returns an error, the commit or rollback behavior depends on the error � MyIASM does not support the rollback and commit, you need to use the InnoDB for that. Difference between Innodb and MyISAM: First major difference I see is that InnoDB implements row-level lock while MyISAM can do only a table-level lock. You will find better crash recovery in InnoDB. However, it doesn't have FULLTEXT search indexes, as does MyISAM.

Make sure you already do command

start transaction;  

before the query delete.

Rollback not working, I've discovered that my application's transactions aren't working; it doesn't rollback when there's an error. Rollbacks work fine when I run them� Rollbacks work fine when I run them from the workbench, but not when the application tries to do them. Below is a list of all the queries my application made in one sample transaction (with added comments). (Note I threw in a junk query in the middle to trigger its automatic rollback.)

SET autocommit=0;
BEGIN;
.
.
.
ROLLBACK;

START TRANSACTION, COMMIT, and ROLLBACK Syntax

MySQL 8.0 Reference Manual :: 13.3.1 START , 13.3.1 START TRANSACTION, COMMIT, and ROLLBACK Statements. START TRANSACTION Otherwise, the following problems can occur: If you use tables � Description: MySQL Community Server 5.5.21 MySQL .NET Connector 6.6.4 Visual Studio 2010, C# 4.0 Distributed Transaction Coordinator service enabled As soon as I add a TransactionScope around my database queries, I get an exception telling me that the operation is not valid for the state of the transaction - effectively disabling the rollback functionality.

I don't know if you were locking tables, but I ran into the same problem where it seemed like rollback wasn't working.

Within my transaction I called "LOCK TABLES...", which

implicitly commits any active transaction before attempting to lock the tables

(http://dev.mysql.com/doc/refman/5.0/en/lock-tables-and-transactions.html)

I ended up locking outside of (before) the transaction, as that was the first thing I was doing in the transaction anyway. Alternatively, you can do as the docs suggest:

SET autocommit=0;
LOCK TABLES t1 WRITE, t2 READ, ...;
... do something with tables t1 and t2 here ...
COMMIT;
UNLOCK TABLES;

MySQL Transaction: START TRANSACTION, COMMIT , To roll back the current transaction and cancel its changes, you use the To force MySQL not to commit changes automatically, you use the following statement:. These statements provide control over use of transactions : START TRANSACTION or BEGIN start a new transaction. COMMIT commits the current transaction, making its changes permanent. ROLLBACK rolls back the current transaction, canceling its changes. SET autocommit disables or enables the default

ROLLBACK, The ROLLBACK statement rolls back (ends) a transaction, destroying any this isn't working" or when you simply don't care whether your temporary work� MySQL transaction allows you to execute a set of MySQL operations to ensure that the database never contains the result of partial operations. In a set of operations, if one of them fails, the rollback occurs to restore the database to its original state. If no error occurs, the entire set of statements is committed to the database.

MySQL - Transactions, MySQL - Transactions - A transaction is a sequential group of database Jobs � Tools � Coding Ground � Current Affairs � UPSC Notes � Online Tutors These two keywords Commit and Rollback are mainly used for MySQL transaction or not) is considered a complete transaction and committed by default when it finishes. I am using Nodejs MySQL and tried to create database level transaction so that I can execute a bunch of statements in a batch and rollback if there … Press J to jump to the feed. Press question mark to learn the rest of the keyboard shortcuts

MySQL Transaction, In this article we cover the concept of a transaction, MySQL and the Data loading statements. was set are undone in the rollback, but InnoDB does not release the row locks that were stored in memory after the savepoint. So I wonder why depsite ROLLBACK is called, the transaction is not cancelled. I do understand that CREATE TABLE is not transactional in nature and can't be rolled back. But I was assuming that INSERT INTO because it deals with inserting rows (not defining schema), WILL actually be transactional, and after ROLLBACK I will be left with empty

Comments
  • The title of your question is very mighty! It sounds like Spanish for y'all guys at MySQL are doping while coding and y'all dev end-users have been using doped db!..lol. MySQL DB is a big deal man! You can't just throw such accusation at it :)
  • i use directly start transac and rollback. but i don't use SET autocommit=0; . but for me trasnaction rollback worked. i would like to know purpose of this SET autocommit=0;
  • @Bharanikumar: When a DB connection is created, it is in auto-commit mode by default. This means that each individual SQL statement is treated as a transaction and is automatically committed right after it is executed. So if you need to do transactions yourself, you must turn off the autocommit mode by set AUTOCOMMIT = 0. Refer dev.mysql.com/doc/refman/5.0/en/innodb-implicit-commit.html
  • You shouldn't need to turn off auto-commit before using a transaction. See dev.mysql.com/doc/refman/5.0/en/commit.html. "To disable autocommit mode implicitly for a single series of statements, use the START TRANSACTION statement. With START TRANSACTION, autocommit remains disabled until you end the transaction with COMMIT or ROLLBACK. The autocommit mode then reverts to its previous state."