sql server disable transaction logging for table

, and the port is dynamically assigned when the service restarts/starts, in order to access the port and start the TCP session. The client sends a request to SQL Server browser to listen on UDP 1434port. In addition, the client sends a broadcast request to the network to search for a SQL Server instance that is availab

Tags: des style blog http color using IO file dataThere is a project using the SQL SERVER2012 version of the database, at first may not notice the log file, so that the log file is getting larger, when the use of sql2008 shrink file method to operate, the problem arises.DUMP TRANSACTION bigdata with No_logbackup LOG bigdata with no_logUsing the method above does not solve the problem, since 2012 does not su

After we have installed the SQL Server servers and the server client tools, you can log in to the database using two command-line methods:>sqlwb-s servername or Ip-e #使用当前windows系统的账户登录sqlserver服务器Such as:650) this.width=650; "src=" Http://s3.51cto.com/wyfs02/M02/79/68/wKiom1aQfTaT1dS7AADo5sJ4YSk344.png "style=" float: none; "title=" QQ picture 20160109112137.png

that there are still unmodified data rows in the table, just like an illusion. Here is an example: Transaction B updates all the data in the table. During this period, transaction a inserts a piece of data. After transaction B queries again, it finds that there are s

(X) lock to update. A deadlock occurs because two transactions are converted to exclusive (X) locks, and each transaction waits for another transaction to release the shared-mode lock.To avoid this potential deadlock problem, use the update (U) lock. Only one transaction at a time can obtain an update (U) lock on the resource. If the

SQL error log records the database running process encountered a variety of problems and some important information, as a problem, we usually do not take the initiative to clean up these log files, only every time the server restart, SQL will automatically delete the oldest log files, and new into a log file. By viewing the database log file on the

exclusive (X) lock to update. A deadlock occurs because two transactions are converted to exclusive (X) locks, and each transaction waits for another transaction to release the shared-mode lock.To avoid this potential deadlock problem, use the update (U) lock. Only one transaction at a time can obtain an update (U) lock on the resource. If the

another user is trying to query the data information?2. Generally, when a connection modifies a data block, other connections cannot query the data block until it is unlocked. And vice versa: it cannot be written or modified during read. This solution will reduce the system performance and efficiency, even though it is currently a row-Level Lock (7.0 was a lock page or even a lock table before), If you modify multiple rows of data at a time, SQLServe

The author once interviewed the DBA, "Why is tempdb faster than any other database?" So that more than 95% of the candidates have a blank face. As an important feature of SQL Server, tempdb has all along been familiar and unfamiliar to it. Familiarity is what we use all the time, strangers may be very few people pay attention to its operating mechanism. I'll introduce you to the

solution is to first query only the primary key select ID from the table where: ORDER BY: Limit 10000,10 (search criteria and sort index), then the primary key to get the data.2. For multiple large data volume (here Hundreds of is even larger) table join, to first paged and then join, otherwise the logical reading will be very high, poor performance.Optimization of transactions: 1. Use commit whenever

SQL Server implements 6 isolation levels to prevent the occurrence of problems similar to attempts to concurrently access or modify the same data in a concurrency scenario. This article will take you through all 6 isolation levels. As you'll see next, you'll understand what each isolation level can achieve and when to use it.I. Introduction of the Business5 of the 6 isolation levels of

query and returns the value of the first column in the first row of the result, which is of type object. Open the connection and define an integer variable, rowcount, to hold the value of the object type cast. int rowCount = (int) sqlcommand.executescalar (); if rowcount=1, the login succeeds, if 0, the user does not exist and the login fails. The integration code is as follows:Parameters:with"Select COUNT (1) from Tb_user"+ "WHERE no= '" + this.txb_UserNo.Text.Trim () + "'"+ "and password=hash

READ (SQL Server default level ). Repeatable read --- repeatable read. SERIALIZABLE --- SERIALIZABLE read (the highest level of transaction isolation, full isolation between transactions ). The following table (1) lists four isolation levels that allow different types of behavior. Isolation level Dirty

in the SERIALIZABLE same level. However, the isolation level does not acquire a shared lock.Enabling this isolation level requires that you first execute the following statement:-- the snapshot-based isolation level needs to be enabled at the database level ALTER DATABASE SET on; -- Modify data does not commit transactions BEGIN TRAN UPDATE SET Name='all'WHERE Id=2;SET TRANSACTION Isolation Level SNAPSHOT; -- queries are not blocked -- returns the

. It allows you to read data rows that have been modified but not committed by other transactions. When SQL SERVER attempts to read data at this transaction level, it does not place a shared lock and directly reads data. Therefore, it ignores the existing mutex lock. In other words, even if the resource has been protected by an exclusive lock, the data can still

Myth #1: After a server failover, a running transaction continues to execute Of course it's wrong! Each failover is accompanied by some form of recovery. However, if a connection is disconnected because of a server or instance crash that occurs when a transaction is not being executed,

Myth #1: After a server failover, a running transaction continues to execute Of course it's wrong! Each failover is accompanied by some form of recovery. However, if a connection is disconnected because of a server or instance crash that occurs when a transaction is not being executed,

Label:Recently in the maintenance of the Web service interface, due to the amount of data data reached tens, the interface calls occasionally error is annoying, after performance testing to detect bottlenecks in the database data processing, can be really busy. It is believed that many program apes and DBAs have headaches, especially the time-outs of application pools and the interruption of background data processing caused by suspended animation, resulting in a large number of data maintenance

SQL server lock mechanism (I)-Overview (lock types and ranges) SQL SERVER lock mechanism (II)-Overview (Lock compatibility and lockable resources) This article introduces the locking mechanism of SQL SERVER (iii) -- Overview (loc

error, it will use the log to roll back the modifications made by the unfinished transactions. That is to say, when the second operation fails, the application must issue a ROLLBACK statement to use the transaction log ROLLBACK function to restore the first operation. That is to say, the deduction operation is restored to achieve data consistency. Similar applications are frequently used in database development. Fault 4: Database point-in-time recove