transactions

问题 Im working on developing a webapplication with MySQL Server 5.1, Spring 3.0.5 and Hibernate 3.6. I use Springs Transaction Management. Im a newbie, so please be patient with me if I ask a question which is easy to answer. :-) 1) I read about global (xa) and local transactions. Is it correct, that global transactions mean transactions, which execute dataoperations on different resources (like different databases). And that local transactions execute dataoperations on only one resource

问题 I am stuck with the installation of TPC-E EGen on Mac OS X (or Linux). I have downloaded the workload generator from TPC website : www.tpc.org/tpce/egen-download-request.asp but I failed to build it. When using the following command for building the utilities: cd Utilities/prj/GNUMake/ make I receive the following error: ../../prj/GNUMake/Makefile.EGenUtilities:136: ../../obj/DateTime.d: No such file or directory ../../prj/GNUMake/Makefile.EGenUtilities:136: ../../obj/EGenVersion.d: No such

问题 I am stuck with the installation of TPC-E EGen on Mac OS X (or Linux). I have downloaded the workload generator from TPC website : www.tpc.org/tpce/egen-download-request.asp but I failed to build it. When using the following command for building the utilities: cd Utilities/prj/GNUMake/ make I receive the following error: ../../prj/GNUMake/Makefile.EGenUtilities:136: ../../obj/DateTime.d: No such file or directory ../../prj/GNUMake/Makefile.EGenUtilities:136: ../../obj/EGenVersion.d: No such

问题 Cassandra does not guarantee atomic behavior so there is a slight chance that one replica fails but other replica do persist the change. Are there any information how to defend against this and what to do in order to heal it if it happens? Does Cassandra heal itself in that regard? [Update] I specially focus on the case where you send a write request to lets say all replica and only one replica fails with a write error. The node failing with the write is still alive and operational. According

问题 I've recently begun using Spring's Data Source Transaction Manager. I have a problem now. My transaction includes updates to a DB table and a write operation to a file. It works fine but I have some doubts about file I/O. As you see below, I have configured openFile and closeFile methods of my bean as the init-method and the destroy-method respectively, which in turn provides those methods to be called just like a constuructor and a destructor. If the file is not closed properly, some of the

问题 I was reading EJB Transaction boundary and Transaction boundary Lets concentrate on RequiresNew Attribute . Here is the modified diagram from the link So let say method-B is annotated with RequiredNew attribute . so according to theory when method-A calls method-B a new transaction will be start and the already started transaction will be suspended, and when method-B returns the new transaction will be committed. Now consider that in section S1 we create a jpa entity using entitymanager

问题 Many examples out there advocate explicit rollback of database transactions, along the lines of: using (var transaction = ...) { try { // do some reading and/or writing here transaction.Commit(); } catch (SqlException ex) { // explicit rollback transaction.Rollback(); } } However, I tend to do this: using (var transaction = ...) { // do some reading and/or writing here transaction.Commit(); } When an exception occurs, I'm just relying on the implicit rolling back of transactions that aren't

问题 So I have a cloud function that is triggered each time a transaction is liked/unliked. This function increments/decrements the likesCount . I've used firestore transactions to achieve the same. I think the problem is the Code inside the Transaction block is getting executed multiple times, which may be correct as per the documentation. But my Likes count are being updated incorrectly at certain times. return firestore.runTransaction(function (transaction) { return transaction.get(transRef)

问题 I am testing payments via paypal sandbox and I noticed that the txn_id passed via the ipn is different from the transaction number the "buyer" gets. I also noticed that the transaction number for both buyer and seller is different. Is it a bug on the sandbox site? or just the way it is? How am I able to track transactions pertaining to specific buyers later if both the transaction numbers are different? Thanks in advance. 回答1: It's intended functionality -- the buyer and seller will have

问题 I am testing payments via paypal sandbox and I noticed that the txn_id passed via the ipn is different from the transaction number the "buyer" gets. I also noticed that the transaction number for both buyer and seller is different. Is it a bug on the sandbox site? or just the way it is? How am I able to track transactions pertaining to specific buyers later if both the transaction numbers are different? Thanks in advance. 回答1: It's intended functionality -- the buyer and seller will have