Two phase commit sql server This is achieved by managing the commit process in two phases (the prepare phase and the commit phase), which is known as a two-phase commit. On standard SQL Server, you can do a Yes. DTC shortcuts the activity and performs a single-phase commit safely. Whereas with Commit command, you are telling the database to save any changes, it can be any addition, modification or deletion on the data that you have made. Two-Phase Commit • Two phase commit (2PC) is the standard protocol for making commit and abort atomic. To connect to SQL Server I have created a Heterogeneous Service(using ODBC) and able to query and insert records in SQL Server by creating a DB Link in Oracle Database… OLE DB provider "MSDASQL" for linked server "LINKEDSERVER" returned message "[IBM][System i Access ODBC Driver]Enlist with DTC phase failed. If the ONE PHASE clause is specified, this statements performs a 1-phase commit on an IDLE transaction. Net server(s). At present, the two-phase commit protocol (2PC) is the most concise and most widely used protocol for this purpose. For that, we are using SQL Transaction in our code. Nov 26, 2019 · Commit on primary: 2019-11-26 06:55:58. Before explaining the two phase-commit, let’s understand the terminology used here. A transaction modifies single node and then commit it in one-phase; If a transaction modifies only one foreign server, we don't need to use two-phase commit protocol. Apr 13, 2021 · The key to this implementation is an appropriate commit protocol. Sep 25, 2008 · In the latter case you open the transaction with the TxID and then reconnect using that ID. ABC System will insert the data, at the same time DEF System will update the data. The DBMS maintains the locks and allows you to pick the session back up through the TxID. SQL Server 2016 (13. Jun 25, 2024 · MS DTC uses proven transaction processing technology from Microsoft to support XA features such as the complete two-phase distributed commit protocol and the recovery of distributed transactions. That means every feature – log shipping, database mirroring (DBM), replication, and yes, even AGs did not support distributed transactions. In its first phase, the data sources are polled as to whether they can commit their part of the transaction. 2. The coordinator notifies the participant that it can begin phase 2. Msg 7391, Level 16, State 2, Line 2 The operation could not be performed because OLE DB provider "MSDASQL" for linked server "LINKEDSERVER" was unable to begin a distributed transaction. Références : Problématique du COMMIT à deux phases : Two Phase Commit Need Have Nothing To Do With ACID or Any Other Kind of Transaction! Distributed Transactions and Two-Phase Commit (page 15 en particulier) May 22, 2011 · It's a poor man's approximation of two-phase commit. sql Alternatively, use any DB tool (such as Query Analyzer or any JDBC tool Using logs and the two-phase commit protocol, atomicity and consistency of writes to the database is ensured in a network of non-byzantine, but possibly failing nodes. Each connection creates its own XA resource, regular JDBC connection, and statement. The value you set for DB2_TWO_PHASE_COMMIT persists for all connections that are established under that server definition. The idea is very simple. A transaction is considered to be a distributed transaction when it is coordinated by a transaction monitor and uses fail-safe mechanisms (such as two-phase commit) for transaction resolution. Mar 17, 2009 · SQL Server uses the MSDTC service for distributed queries and two-phase commit transactions, as well as for some replication functionality. SQL Server establishes a connection with the MSDTC (B) service using olehlp!DtcGetTransactionManager, asking for the IResourceManager interface. 1. However, you may want to Jun 27, 2017 · Clustered instances of SQL Server were the only way to get high availability support for distributed transactions until SQL Server 2016 (more on that in a minute). This pass determines and constructs a dirty page table (DPT) consisting of pages that might be dirty at the time SQL Server stopped. Two XA connections to the same database server are created. This phase returns the database to the state at the time the SQL service stopped. This information was obtained by Feb 13, 2023 · El Two-Phase Commit (2PC) es un método utilizado para garantizar que los datos se consignan en una base de datos de forma coherente y correcta. 100 How federated two-phase commit transactions If a database server is referenced in a distributed transaction, the value of its commit point strength determines which role it plays in the two-phase commit. How if yes. ” in Spanner: Google’s Globally-Distributed Database [return] the only case of 2PC in the cloud at the PaaS level we know of is Elastic Transactions in Azure SQL DB. . この記事では、2相コミットプロトコル（Two-Phase Commit Protocol）によるSQL処理の概要とその重要性について解説します。さらに、実際のデータベース操作においてどのように2相コミットプロトコルが役立つのかについても触れていきます。 Oct 18, 2010 · If making that entry fails, then the transaction can't commit. A two-phase commit protocol cannot dependably recover from a failure of both the coordinator and a cohort member during the commit phase. 7 wrapper net8 options (db2_two_phase_commit 'y'); 次の例は、alter server ステートメントを使用して 2 フェーズ・コミットを使用不可にする方法を示しています。 alter server net8_server options (set db2_two_phase_commit 'n'); Feb 25, 2019 · 無論是業務需求或是 IT 需求的關係，依據不同需要將資料庫分放在不同伺服器的情形很多見，要進行跨資料庫伺服器交易我們可以啟用 MSDTC 服務來達成，我就在想能 create server net8_server type oracle version 8. Also, I've heard about currently evolving Distributed SQL (DSQL) tools like CockroachDB, YugabyteDB and YDB, which also support distributed ACID-like transactions via their own low-level db nodes communication. Specifically, the commit point strength determines whether a given node is the commit point site in the distributed transaction and thus commits before all of the other nodes. As Ignacio states, there can be deferred constraint checking (this could be any form of constraint, not just unique constraint, depending on the DBMS engine). Specifically, the process of writing intents is analogous to the “prepare Microsoft SQL Server articles, forums and blogs for database administrators (DBA) and developers. We save data on the primary and the refresh is just faster as the latency after the commit. Then, it rolls back any uncommitted transactions and aborts executing queries. Key Components for Implementing Distributed Transactions. However, it is possible that some site fails to respond; it may be down, or it has been disconnected by the network. Hello , My question is: does ms sql support two phase commit protocol? and Why if no. Feb 11, 2022 · Two-phase locking(2PL for short) is one of the most well-known algorithm for serializability. – The DB2_TWO_PHASE_COMMIT server option enables two-phase commit for data sources. Apr 24, 2014 · In essence, yes, 2 phase commit gives you ACID capabilities across multiple resources (> 1 database, message queues, transactional web services, file systems etc). XA_OPEN_STRING_OPTIONS: Required when DB2_TWO_PHASE_COMMIT is set to Y. Configuring MS DTC in Windows Server 2003 clusters as defined in this Microsoft KB article is not pretty straight-forward. What is Two-Phase Commit (2PC) Two-Phase Commit is a protocol for managing distributed transactions involving multiple databases or systems. Now if a query is issued to one of those (A two-phase commit is generally used to commit transactions that are spread across multiple data sources. PostgreSQL follows the features and model proposed by the X/Open XA standard, but does not implement some less often used aspects. If everything goes well, they both respond with "prepared", which means: The transaction is recorded durably, and marked prepared Mar 31, 2015 · This problem is – mostly – circumvented by the addition of an extra phase to 2PC, unsurprisingly giving us a three-phase commit protocol. If either El algoritmo está basado en la existencia de un coordinador (al resto de nodos de la red se les llama participantes) y se divide en dos fases: [2] Fase de preparación de commit, en la cual el coordinador intenta preparar a todos para el commit contactando con todas las réplicas que participan, las cuales contestan si aceptan o abortan la transacción. It enables Java applications and application servers to perform distributed transactions across XA resources Sep 15, 2021 · A transaction is considered to be a local transaction when it is a single-phase transaction and is handled by the database directly. Can anyone shed light on whether it can? Any experience in similar types of workflows? 6. How to guaranteed the entire set of operations completes, or the entire set of operations fails, and the state of the system is restored to the state May 18, 2006 · Does anyone have any thoughts on using a link server to participate in a distributed transaction with SQL Server and z/os DB2? Two-Phase (2PC) commit? Not sure if this is even feasible. The participant logs the start of phase 2. In our tutorial, we are going to learn these two important aspect of two phase commit protocol. Two-Phase Commit Protocol §One coordinator and many subordinates •Phase 1: prepare •All subordinates must flush tail of write -ahead log to disk before ack •Must ensure that if coordinator decides to commit, they can commit! •Phase 2: commit or abort •Log records for 2PC include transaction and coordinator ids If a database server is referenced in a distributed transaction, the value of its commit point strength determines which role it plays in the two-phase commit. – Jul 29, 2010 · Second, the systems involved must support “two-phase commit” (which was added to PostgreSQL in version 8. Java Transaction API (JTA) is a Java Enterprise Edition API developed under the Java Community Process. If another transaction is in process at that point, the server waits for an interval that's equal to the ForceCommitTimeout setting. e. Sep 27, 2024 · The 2PC protocol operates in two phases, a prepare phase and a commit phase. 2PC（Two-Phase Commit）协议是分布式系统领域中的一个重要协议，它的历史可以追溯到20世纪70年代。 在分布式系统中，多个应用程序可能需要访问和更新共享数据，但是保证数据的一致性是一个挑战。在1978年，Jim Gr… Does Ms Sql Support Two Phase Commit Protocol Dec 29, 2006. Distributed systems Feb 22, 2021 · XA，2PC，two-phase commit protocol。 两阶段事务提交采⽤的是 X/OPEN 组织定义的DTP 模型所抽象的. Standalone systems implement local transactions through transaction managers (TMs). The gateway uses the transaction log table to check the status of failed transactions that were started at the SQL Server database by the gateway and registered in the table. Oct 4, 2012 · Because I have several unrelated resources to coordinate during commit, I would like to use two-phase commit (2PC) on Azure SQL Database, from Java code (JDBC). Configuring Sybase data sources There are several requirements and restrictions for using Sybase data sources for federated two-phase commit. Mirroring two phase commit: Author: Topic : ranvir_2k Posting Elastic database transactions target the following scenarios: Multi-database applications in Azure: With this scenario, data is vertically partitioned across several databases in SQL Database or SQL Managed Instance such that different kinds of data reside on different databases. Jan 23, 2009 · Let's say, i've ABC system at ABC Location (using SQL Server 2000) and DEF System at DEF location (using Oracle). Performing two-phase commit transactions . 98 Two-phase commit for federated transactions - examples . Every other server receives a Sep 4, 2020 · Two-phase commit in a distributed transaction. Apr 10, 2019 · An Example Using XTA: XA Transaction API Abstract. SQL Server Specific: flushing FILESTREAM data can be deferred until commit time. In the second phase, the transaction is actually committed on all data sources. Phase 2 is successfully completed, which establishes a new point of consistency for the participant. Running two-phase commit over Paxos mitigates the availability problems. The DB2_TWO_PHASE_COMMIT server option enables two-phase commit for data sources. Specifies the resource manager ID of the Microsoft SQL Server Registry. That said, the coordinator is part of the database instances and Azure SQL DBs are the only allowed Stack Overflow for Teams Where developers & technologists share private knowledge with coworkers; Advertising & Talent Reach devs & technologists worldwide about your product, service or employer brand Nov 23, 2023 · The commit phase actually carries it out. Phase 1: The coordinator sends a prepare message to both databases. Mar 24, 2021 · We will take a look at a protocol called 2-Phase Commit, that helps us achieve the same. js and PostgreSQL. dll from the XA directory to the <SQL_Server_Root>/binn directory of the SQL Server installation. to Oracle hosted on *nix server), you'll likely need to configure XA on your originating . Phase 2: If both databases vote to commit, the coordinator sends a commit message. We break the second phase of 2PC – ‘commit’ – into two sub-phases. In 2/1/2012 7 2. provided that all databases are configured accordingly, you will be able to conduct a 2 phase transaction across SqlServer, Oracle and an MQSeries queue. The two-phase commit pattern works by syncing database nodes in two phases, in which each node must first prepare to commit and then execute the commit. May 21, 2023 · T he Two-Phase Commit (2PC) protocol plays a crucial role in ensuring data consistency in distributed database systems. In SQL Server 2016 (13. This option offers some performance benefits and greater data safety than Emulate Two-Phase Commit, but it has some limitations. x) Service Pack 1 and earlier versions, cross-database distributed transactions (that is, transaction using databases on the same SQL Server instance) involving a database in an availability group aren't supported. vmp. The coordinator finishes its phase 2 processing. In MS technologies, MS-DTC is used, although this is nicely encapsulated within TransactionScope in . 2". 8104941 The data on secondary is readable approximately after one second after commit on the primary cluster. The two-phase commit protocol was designed in the epoch of the “big iron” systems like mainframes and UNIX servers; the XA specification was •Schedule 2: R 1(A), W 1(A), R 2(A), W 2(A), R 2(B), W 2(B), R 1(B), W 1(B) C 1 = “Commit” by Transaction T1. In phase 1, the orchestrator tells the order and payment services to prepare to commit. • A participant P is ready to commit T if all of T’s after-images at P are in stable storage. Host Integration Server supports 2PC over TCP/IP, enabling you to gain the security of a 2PC connection over the Internet. create server net8_server type oracle version 8. That explains the save-refresh problem on the portal. The transaction manager database writes a "PREPARED" record to its log file, and sends a reply to inform the client that the second phase of the commit process can be started. La primera fase del 2PC consiste en que todos los participantes (normalmente los sistemas de bases de datos) se pongan de acuerdo para consignar los datos. As part of the prepare phase, each node participating in the transaction acquires whatever it needs to assure that it will be able to do the commit in the second phase—for example, any locks that are required. 1). • Coordinator - the component that coordinates commitment at home(T). Distributed transactions are committed using PREPARE TRANSACTION ‘foo’ (phase 1), and COMMIT PREPARED ‘foo’ or ROLLBACK PREPARED ‘foo’ (phase 2), rather than the usual COMMIT or ROLLBACK. XA COMMIT XA COMMIT xid [ONE PHASE] XA COMMIT definitely commits and terminates a transaction which has already been PREPARED. I am trying to do a two-phase commit one in Oracle817 and the other in SQL Server. You register a data source server definition by using the CREATE SERVER statement. Important Running elastic database transactions between Azure SQL Database and Azure SQL Managed Instance is not supported. The participant then notifies the coordinator that it is finished with phase 2. 2. Only if both stages complete successfully will the transaction be completed. XA RECOVER Mar 7, 2019 · 分布式两阶段提交（Two-Phase Commit，2PC）是分布式系统中常用的一种原子提交协议，用于保证在分布式事务中所有参与者要么全部提交事务，要么全部回滚事务，以维护数据的一致性。 Chapter 9. Net. The default is 30 seconds. Test 6 confirms the behavior of the commit phase of the two-phase commit. Transaction Manager: MSDTC acts as a transaction manager for distributed transactions Par exemple dans le cas de MS SQL Server, c’est Service Broker qui assure cette couche. 97 Planning for federated two-phase commit . As a core component of transaction processing, it helps maintain the ACID Mar 6, 2012 · The Oracle two-phase commit mechanism is completely transparent to users who issue distributed transactions. Feb 20, 2025 · Two-phase transactions are intended for use by external transaction management systems. Sep 6, 2024 · In 2 phase commit, lets say one of the nodes crashes or is slow during the commit phase and the other nodes have already successfully committed their changes. Jan 15, 2019 · A DTC transaction involves resource managers (RMs) of which SQL Server can be one of them. Feb 26, 2015 · To serve as RM (resource manager) in distributed transaction, DBMS must implement 2-phase commit. Like in PostgreSQL, when you first "pre-commit" local transaction: PREPARE TRANSACTION 'foo' then. It ensures data atomicity and consistency across multiple systems where a distributed transaction is May 4, 2023 · @wally2 this is quite common problem (for example in microservice architecture), usually it is solved either via eventual consistency approach (google the Saga pattern), two-phase commit protocol or other solutions for distributed transactions. Thank you. A 1 = “Abort” by Transaction T1 •Two possible representation of schedules •Nomessage passing •Fixedsetof objects (for now) (next slide) Nov 7, 2019 · Or at least, this is how transaction atomicity has worked in CockroachDB up until version 19. SQL Server uses two-phase commit protocol for the distribution transaction once the user issues a commit statement. Those familiar with distributed systems may recognize this multi-step process as a variation of the two-phase commit protocol (2PC). In this article, we will learn the following topics: Microsoft Distributed Transaction Coordinator (popularly known as MSDTC) is a coordinator to handle the distributed transactions. Feb 16, 2023 · The two-phase commit pattern. This takes place after the actions performed by the branches of the global transaction have been executed. In the prepare phase, the coordinator contacts all nodes involved in the update and sends them a prepare request, each node responds with a vote to confirm if they are (or are not) OK to commit . 次の図は、Windows ベースのクライアント アプリケーションが暗黙的に Microsoft 分散トランザクション コーディネーター (DTC) を使用して、SQL Server と CICS TP を含む分散トランザクションの 2 フェーズ コミットを調整する仕組みを示しています。 Jul 10, 2021 · Two-phase commit is all about handling failures and what they mean. 97 Federated architecture for two-phase commit . We will have to execute the two SQL queries on two separate servers. All the participants are then informed of the final result. Oct 18, 2020 · @DanGuzman: I'm only talking about communication latency. AP 应用程序，Application Program，定义事务边界(即定义事务的开始和结束)，并且在事务边界内对资源进行操作 Two-Phase Commit Protocol 3-15 Oracle Database Server SQL Construct Processing 4-11 Data Type Checking Support for a Remote-Mapped Statement 4-12 Jul 3, 2012 · As the server enters phase 2 of the commit, it tries to obtain a server-level lock to update Master. Aug 6, 2024 · This feature improves distributed transaction efficiency because it reduces the number of two-phase commit processes. The process for executing a global transaction uses two-phase commit (2PC). Previous Next JavaScript The application runs one or more SQL statements The transaction manager database writes a "PREPARED" record to its log file, and sends a reply to inform the client that the second phase of the commit process can be started. Feb 23, 2022 · SQL Server can be an APP (linked server to other DTC enabled resources) or an RM. From the command prompt run the following command in the directory where you extracted jTDS: isql -Usa -P<sa_password> -S<server_name_or_ip> -iXA\instjtds. View 2 Replies Similar Messages: Two Phase Commit; Two Phase Commit With Sql And Msmq; Transactional Replication 2 Phase Commit; Data Flow Stuck In Phase The Final Commit Data Nov 5, 2020 · Example 2. • Participant - a resource manager accessed by T. It is important to note that once LOP_PREP_XACT entry is in a transaction log, the coordinator will always be contacted. Sep 27, 2023 · 2PC (2 phase commit) 前言 前面介紹了 CAP 定理，得知了在分散式系統中，資料的同步只能 C3 取 2。 CA 資料庫非常常見，一般的 RDBMS 就是。 Apr 18, 2023 · Two phase is all or nothing, with definition if one commits, all will eventually commit, if one aborts all will eventually abort. When communicating with non-Windows tech stack (e. Dec 29, 2020 · The Second phase started as the response abort T or commit T receives by the coordinator(C i) from all the sites that are collaboratively executing the transaction T. The problem with two-phase commit. Once each node is able to ensure it can commit in the second phase, it lets the coordinator Restrictions: For Microsoft SQL Server data sources, federated two-phase commit is only supported by Federation component installed on Windows. Two phase locking makes use of lock in a much stricter manner. When configuring the gateway for two-phase commit, a table must be created in the SQL Server database for logging transactions. The first is the ‘prepare to commit’ phase. ; The Db2® isolation level is not propagated to the Microsoft SQL server. May 7, 2022 · I am currently reading the Microservices Patterns and it says there are mostly two approaches for distributed transactions: two phase commit (2PC) and sagas pattern. SQL Server uses background tasks to support MSDTC RM requests. An active transaction table is built of the uncommitted transactions at the time of the SQL Server stopped also. 9978911 Readable on secondary: 2019-11-26 06:55:59. That could fail. Jan 23, 2022 · 由于innodb对于MySQL而言仅仅是存储引擎，在mysql server层和innodb 存储引擎层都存在这不同的日志，分别是binlog和redo log，那么一个事务的提交和回滚 肯定是要有一定顺序的，这就要统一协调binlog和redo log的记录方式和提交顺序，当然在实际情况下MySQL为了提高性能还有group commit等技术，同样也给两次 Sep 14, 2021 · If your transaction involves more than one resource, you must perform a two-phase commit (2PC). For more information about how to use distributed transactions, see Understanding XA transactions . Even with a very low workload, I'm trying to find out if SQL Server will be able to handle the two-phase commit if the slave's write confirmation message takes too long to be received by the master, simply as a result of the huge distance between the master and slave. When the user executes PREPARE TRANSACTION, the only possible next commands are COMMIT PREPARED or ROLLBACK PREPARED. Aug 10, 2013 · Copy JtdsXA. Nov 22, 2024 · If the transaction committed was a Transact-SQL distributed transaction, COMMIT TRANSACTION triggers MS DTC to use a two-phase commit protocol to commit all of the servers involved in the transaction. g. Prepare phase. Jan 27, 2025 · This post aims to demystify Two-Phase Commit (2PC) by implementing it using Node. A server-side experience (code written in stored procedures or server-side scripts) using Transact-SQL is available for SQL Managed Instance only. 97 Two-phase commit for federated transactions . Each database responds with vote commit if it can successfully commit. There's a religious debate going on in the department as to whether SQL Server Service Broker can or can't handle this type of scenario reasonably cleanly. In fact, users need not even know the transaction is distributed. Sep 4, 2020 · In the 18 th part of the SQL Server Always On Availability Group series, we will discuss the cross-database MSDTC support in an availability group. 12 During the second phase of the commit process, the database client sends a message to all participating databases to tell them to commit. Jul 9, 2003 · Hello Friends. A COMMIT statement denoting the end of a transaction automatically triggers the two-phase commit mechanism to commit the transaction. This is how distributed transactions using two-phase commit protocols (such as XA or COM+ Transactions) work. The two-phase commit protocol (the prepare phase and the commit phase) ensures that when the transaction ends, all changes to all resources are either totally committed or fully rolled back. It is about Atomicity, what you are talking is Isolation, telling what others can see when transaction is in progress. We’ll start by looking at a very basic, no-frills approach. Predicates, such as WHERE=; column and scalar functions, such as MAX and MIN; sorts, such as ORDER BY OR GROUP BY; and joins are not included in any SQL that the federated server sends to the data source. Mar 20, 2019 · Of course you can implement 2-phase commit across microservices, but: 2-phase commit requires a significant development effort in every service that can participate in a transaction, It causes a lot of contention between clients that grows with the communications latency between servers; and Commit records for two-phase commit (2PC) transactions are inserted in a table on the resource itself, and the result determines the success or failure of the prepare phase of the global transaction. Sep 28, 2023 · Understanding Two-Phase and Three-Phase Commit Protocols: Key Differences, Use Cases, and Practical… In distributed systems, coordinating transactions across multiple resources can be complex. 7 wrapper net8 options (db2_two_phase_commit 'y'); 次の例は、alter server ステートメントを使用して 2 フェーズ・コミットを使用不可にする方法を示しています。 alter server net8_server options (set db2_two_phase_commit 'n'); Sep 3, 2024 · To ensure both databases either commit or roll back the transaction, the Two-Phase Commit Protocol is used. When the transaction manager receives a commit request, it sends a prepare command to all of the resource managers involved in the transaction. 830 2010 Lecture 16: Two-Phase Commit last time we were talking about parallel DBs partitioned data across multiple servers we mostly discussed read-only queries what about read/write queries? high-level model a bunch of servers rows are partitioned over servers each server runs a complete DB on its partition SQL, locks, logging I point this out because of what happens in the next and final stage, the commit part of the two-phase commit. Phase 2: Redo. This program is the result of a project in the CS 223 Transaction Processing and Distributed Data Management course by at the University of California, Irvine. Note that it is totally different concept from two-phase commit even though both these concepts sound confusingly similar. If only the coordinator had failed, and no cohort members had received a commit message, it could safely be inferred that no commit had happened. If a single resource manager is involved in the transaction there is no need to perform 2-phase commit. Mar 3, 2019 · TransactionScope and 2-phase commit In two different SQL Server server. x) Service Pack 2 and later versions provide full support for distributed transactions in availability groups. =# BEIGN; =# INSERT INTO ft1 VALUES (1); =# COMMIT; On fs1 server, we will see the following server logs. Apr 19, 2022 · Client application using Transaction Integrator and DTC to coordinate a two-phase commit between SQL Server and a CICS application Aug 19, 2024 · Two-phase commit (2PC) is a host server-installed protocol that ensures that updates to multiple instances of a database on a network either succeed or fail in their entirety. . In the first phase, all branches are prepared. As previously mentioned, distributed transactions follow a two-phase commit protocol. 10 Repository pattern with MongoDB - multiple units of work with one transaction There are several requirements and restrictions for using Microsoft SQL Server data sources for federated two-phase commit. 詳細情報: 2 フェーズ コミット. Note. Mar 26, 2025 · Two-phase commit is a widely-used distributed algorithm to facilitate the decision to commit or rollback a distributed transaction. XA ROLLBACK XA ROLLBACK xid XA ROLLBACK rolls back and terminates an IDLE or PREPARED transaction. teps xerq dzgzeg jtvvtet dfvm ydxtgq klgo olhl lwdb win njshev dmlxi cumiit tefttx aii