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Tags: consistency acid sequence start City feature no NSA meaningThe database transaction transanction four basic elements that are correctly executed.ACID atomicity (atomicity)Atomicity: All operations in the entire transaction, either complete or complete, are not likely to stall in the middle of the process. When an error occurs during execution, the transaction is rolled back (Rollback) to the state before the transaction begins, as if the transac
Oracle autonomous transactions are stored procedures and functions that can handle internal transactions themselves and are not affected by external transactions and are declared with pragma autonomous_transaction. To create an autonomous transaction, you must use the Pragma autonomous_transaction statement in Pl/sql in the top-level of the anonymous block or in
Label:Transaction First, what is a businessCode control that ensures consistency of data, either committing commits or rolling back to the initial state of a transaction Second, the four characteristics of business: ACIDA: atomicity-------transaction is not detachable, either executed or rolled back without intermediate stateC: Consistency-------consistency before and after dataI: Isolation---
Why does the database require ImplictCommit (implicit commit of transactions) First look at an SQL statement. What do you think is the output of the last SQL statement? SET AUTOCOMMIT = 1;BEGIN;INSERT INTO t1 VALUES (1);CREATE TABLE t2 (pk int primary key);INSERT INTO t2 VALUES (2);ROLLBACK;SHOW TABLES; The answer is: t1 and t2 both exist! mysql> show tables;+----------------+| Tables_in_test |+------------
Label:Rdiframework.net framework compatible with various database type transactions use example referenceThe rdiframwork.net framework has a good control over the transaction of the database, it provides good support for the execution of multiple tables or multiple statements in the same transaction, and supports any m
When doing a project, you need to implement database transactions. I think it is too troublesome to write code with SqlTransaction every time. I want to summarize a general method and put it on the data layer for reuse. I wrote a simple method myself. it can meet general req
capabilities. You can improve the overall functionality of your application by selecting different technologies to get additional speed or functionality.2. These different technologies and associated functions are called storage engines (also known as table types) in MySQL.3. Check the MySQL supported storage engine through show engines.4. The most storage engines used in MySQL are: innodb,bdb,myisam, memory, etc. where InnoDB and BDB support transactions
Note: This article is reproduced from http://www.hollischuang.com/archives/923Row-level locks, table-level locks, page-level locks are described in MySQL, row-level locks are the most granular lock in MySQL, and row-level locks can significantly reduce database operation conflicts. Row-level locks are divided into shared and exclusive locks, this article will detail the concept of shared locks and exclusive locks, how to use and precautions.Shared Loc
Note: This article is reproduced from http://www.hollischuang.com/archives/923Row-level locks, table-level locks, page-level locks are described in MySQL, row-level locks are the most granular lock in MySQL, and row-level locks can significantly reduce database operation conflicts. Row-level locks are divided into shared and exclusive locks, this article will detail the concept of shared locks and exclusive locks, how to use and precautions.Shared Loc
through the comprehensive performance monitoring of the database can we find the factors and bottlenecks that affect the performance of the system, so that we can take practical strategies to solve the problems and improve the performance of the system. Concurrency is also a very important concept, which is used to solve problems when multiple users operate on the same data. Especially for the network
The spring transaction mechanism mainly includes declarative transactions and programmatic transactions, where declarative transactions are emphasized, and programmatic transactions are not widely used in real-world development, and are for reference only.Spring declarative transac
Database Atomic OperationsAs an example:A consumer in a merchant to swipe credit card consumption, the transaction is normal, the bank in the consumer's account minus the corresponding money, the merchant's account plus the corresponding amount. However, if the bank has deducted the money from the consumer's account, and has not added the corresponding money in the merchant's account, for some reason, the s
conventional optimization method, and the second part is the optimization method with a slight "evil" point. Conventional Optimization Methods for large concurrent transactions: 1) redo log Disk Optimization: If it is stored, you can take out a few more disks for the LOG disk, the most basic knowledge disk should be made into RAID 10, not RAID 5. Depending on yo
Transaction 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, transactions are usually referred to as
The four characteristics of database transactions ( acid) are:(1) atomicity (atomicity) The atomicity of a transaction is that the program contained in the transaction acts as a logical unit of work for the database, which either executes all of the data modification operat
This year's Taobao double 11 transactions reached an astonishing 57.1 billion, in these glossy data behind, in fact, Taobao database is a great test. What is more noteworthy is that this year the double 11 Alipay payment peak broke through 2.85 million strokes per minute, hitting a new record. The volume of such
second and 200 queries per second. distributed transactions are required. If you think about it, you can: There is a server dedicated to support modifications. 10 modifications per second are completely within the scope of assumptions. Ten other servers support queries, with each server 20 times, reducing the load. However, these ten servers need to maintain data synchronization with the servers suppor
transactions currently in the system, as well as transactions from external systems), so that the data is locked during the entire data processing process. Pessimistic lock implementation, often rely on the database provided by the lock mechanism (also only the database layer provides
Label:Problems with data concurrencyA database may have multiple access clients that can access the database concurrently. The same data in the database may be accessed by multiple transactions at the same time, and if the necessary isolation measures are not taken, it can cause various concurrency problems and destroy
index. This will cause a deadlock to occur.After a deadlock occurs, InnoDB can generally detect and cause one transaction to release the lock fallback, and the other to acquire the lock to complete the transaction. There are several ways to avoid deadlocks, and here are just a few of the three common1, if different programs will access multiple tables conc
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