sql server transaction log reader

a few higher-granularity locks to reduceLow system load. In SQL Server, when there are many locks in a transaction and the lock upgrade threshold is reached, the system will automaticallyRow-level locks and page locks are upgraded to table-level locks. It is particularly worth noting that in SQL

no answers yet. According to this article on the CSDN blog, you can take a look at the Hong Kong virtual host and website space before continuing to look at it, because some content in the CSDN blog will be referenced below SQL Server transaction log Introduction The first question: why does the number of

the third SQL Server called witness. Witness can be used as a common SQL Server, but it keeps an eye on the other two image servers. When the primary image fails, witness allows the second image to take over the operation, similar to an automatic failover. During failover, any client

error message, contact your system administrator. */ The results show information about the oldest activity log, including the server process ID, the user ID, and the start time of the transaction. The key is the SPID and start time. Once you have this information, you can use the dynamic management view (DMV) to verify the T-

1. instance reproduction of four types of transaction concurrency problems in SQL Server Zhu Er (2006.3 reproduced please note the author) http://blog.csdn.net/netcoder/article/details/633153This articleArticleIt will use instances to reproduce four types of concurrency issues in database access, hoping that beginners can have a better understanding of

the writer does not block the reader. However, the writer can and will block the writer, which is also the cause of the conflict. At this time, SQL Server generates an error message when a conflict occurs, but the application is responsible for influencing the error. Transaction processing: ACID properties Atomicity:

Transaction logs are very important but often ignored in the database structure. Since it is not as active as the schema in the database, few people are concerned about transaction logs. Transaction logs are records of database changes. They can record any operations on the database and save the record results in an independent file.

SQL 2008 log Files account for 23G of hard disk space, and the transaction log has been truncated (Truncate), the actual log content is small, 1G is not, want to release the extra space occupied by the log files. However, no matt

All SQL Server activities generate locks. The smaller the lock unit, the more concurrent processing capability the higher the management lock overhead. It is difficult for SQL Server to find a balance between concurrency and performance. SQLServer has the following types of cons: 1. Shared locks are used for read-only

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

Generally do not modify the default level of SQL Server transactions. Forced lock is not recommended1 Execute EXEC sp_lock report information about the lock1 How to lock a row in a tableSET TRANSACTION Isolation Level READ UNCOMMITTEDSELECT * FROM table rowlock WHERE id = 12 locking a table for a databaseSELECT * from table with (HOLDLOCK)Add lock Statement:Sybas

You've tried transaction-sql programming. This thing is disgusting, except the IDE, the most disgusting number of programming involved in the string concatenation problem. Imagine: In a huge complex business logic, it's full of while,if,case. You have to take care of all the situations and stitch strings in a certain rule. These strings may be SQL, or they may be

My SQL Server → 5 transaction processing. the concept of transactions the transaction mechanism treats a group of database operation commands as a complete and independent operation sequence, that is, a group of commands either succeed or fail to be executed. 1. Role of a transacti