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Note: This article is reproduced from http://www.hollischuang.com/archives/898Transaction Business (Transaction), generally refers to the things to do or do. In computer terminology, it refers to a program execution unit (unit) that accesses and possibly updates various data items in a database. In computer terminology,
receives, but the money of a does not submit; B turn back a 50 bucks? Eh, how much money? There are countless unforeseen circumstances that occur ....1. Four characteristics of transactions (ACID)atomicity (atomicity)atomicity means that a transaction is an inseparable unit of work, and the operations in the transacti
and User B both the sum of money together is 5000, then no matter how a and B transfer, transfer several times, after the end of the transaction two users of the sum should be 5000, this is the consistency of the transaction. 3. Isolation (Isolation)Isolation is when multiple users concurrently access the database, such as when the same table operation, the database
Tags: transaction database transactions JavaIn the specific work, some things need to be maintained, do not need to roll back, some work need to rollback, and these logic, you can manually set the rollback point of the transaction.1. Preparation of transaction rollback points for database transactions with Javato have
Tags: Code query conditional transition Val into solution return two times principle Note: This article is reproduced from http://www.hollischuang.com/archives/943 This article details four types of transaction isolation levels, and illustrates, by example, what kind of reading can be resolved at different levels. The implementation principle of different isolation levels in relational database is also introduced. In the DBMS,
Explain the background before you write!Do development also for a long time, not how to tidy up the knowledge, now analyze their own understanding of database transactions, formerly with SQL Server, now turn Java and use MySQL, Oracle. This is my main explanation for MySQL database
Message_applied Where Msg_id = Message. ID; End End However, if the operation on database a succeeds and database B fails, I can try again in a short time. If the retry fails, I have to perform manual rollback on the data in database
implement optimistic locking is CAs, which is widely used in JDK 1.5 java.util.concurrent . However, it is important to note that there is an ABA problem with this algorithm.CAs and object creationIn addition, CAS has an application that is in the process of creating objects in the JVM. Object creation is very frequent in virtual machines. Even if you just modify the position that a pointer points to, it is not thread-safe in concurrency, it may be a
read " dirty " Data refers to a transaction t1 Modifies a data and writes it back to disk, transaction t2 After reading the same data, t1 t1 t2 The data that is read is inconsistent with the data in the database, t2 The data read is " dirty " data, that is, incorrect data. Dirty data is very common in more complex, interactive systems.
way to implement optimistic locking is CAs, which is widely used in JDK 1.5 java.util.concurrent . However, it is important to note that there is an ABA problem with this algorithm.CAs and object creationIn addition, CAS has an application that is in the process of creating objects in the JVM. Object creation is very frequent in virtual machines. Even if you just modify the position that a pointer points to, it is not thread-safe in concurrency, it m
transaction is executed. If the transaction completes successfully, all changes in the system are applied correctly and the system is in a valid state. If an error occurs in the transaction, all changes in the system are automatically rolled back and the system returns to its original state.3) Isolation (isolation)In a concurrency environment, when different transactio
Label:Note: This article is reproduced from http://www.hollischuang.com/archives/943 This article details four types of transaction isolation levels, and illustrates, by example, what kind of reading can be resolved at different levels. The implementation principle of different isolation levels in relational database is also introduced. In the DBMS, a transaction guarantees that
I have been debugging for half a day because l transaction is not effective today. It is because the MySQL database MyISAM type table does not support transactions.Later, I changed the table type to InnoDB, and the transaction processing took effect. It was depressing for half a day !!! Basic transaction code: String sqlstr = @ "insert into 'mets _ daily_drinki
string the stringsql ="INSERT into students (Id,stuname,phone,address,city,state) VALUES (7, ' AAA ', ' 1318697125 ', ' zz ', ' BB ', ' CCC ')"; * //SqlCommand represents the Send Database execution SQL command $SqlCommand Command =NewSqlCommand (sql,connection);Panax Notoginseng //Send command to database execution - //SQL statements can b
Label:Today test, 150 data, call Jdbctemplate.batchupdate statement, the case of not open transaction, 6m or so to execute, after the transaction, hundreds of milliseconds to execute, the gap is very large.Because it is executed in a pool of threads, the task is new and cannot be processed as a bean, so the transaction manager can only be invoked manually by using the injected transaction.First, get the tra
Let's look at the database -- (4) transactions and database transactions. What is a transaction? Simply put, it is what you do or what you do. A term refers to a program execution unit
Tags: inconsistent settings based on shared picture data Ted a Java multithreaded insert RACThis article tells the four characteristics (ACID) of transactions in the database, and will explain the isolation level of the transaction in detail.If a database claims to support t
Tags: XDP no NSIs phenomenon take a look at the mic sectionThis article tells the four characteristics (ACID) of transactions in the database, and will explain the isolation level of the transaction in detail. If a database claims to support transactional operations, then th
Tags: Zab pad ali Results default IDT serialization transaction Isolation level number Author: FJDINGSDSource: Blog Park This article tells the four characteristics (ACID) of transactions in the database, and will explain the isolation level of the transaction in detail. If a database claims
Tags: city did action different where commit successful log executionThis article tells the four characteristics (ACID) of transactions in the database, and will explain the isolation level of the transaction in detail. If a database claims to support transactional operations, then the
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