bulk update

Original address: http://blog.csdn.net/westsource/article/details/6658109By default, the bulk copy operation is performed as a standalone operation. The bulk copy operation occurs in a non-transactional manner and cannot be rolled back. If you need

1. Course OutlineThis course focuses on the content of the MongoDB data update, including the insertion of the Insert function, the removal of the Remove function from the document, and the basic use of the update function for document updates. In

1 PrefaceThe database large concurrency operation takes into account the deadlock and lock performance issues. See online most vague (especially update lock), so here is a concise explanation, for the following description of the convenient, here

First, the introduction of batch processingIn the actual project development, sometimes need to send a batch of SQL statement execution to the database, should avoid to send execution to the database, and should adopt the batch processing mechanism

It is recommended to use Addbatch when you bulk update SQL operations, so that the efficiency is higher, the larger the amount of data can be reflectedThere are two methods in the statement interface:void Addbatch (String sql)Adds the given SQL

This article was reproduced from: http://blog.csdn.net/yuanyuanispeak/article/details/527561671 PrefaceThe database large concurrency operation takes into account the deadlock and lock performance issues. See online most vague (especially update

This article collects some methods for improving the performance of JDBC. The performance of a Java application or EE Web application is important, especially the performance impact of the database backend on the application. I don't know if you've

Overview of LocksI. Why to introduce a lockConcurrent operations on a database by multiple users can lead to inconsistencies in the following data:Missing updatesA, a, two users read the same data and modify it, and one of the user's modifications

SQL Server shared lock, exclusive lock, update lock use previous/next 2009-11-08 00:29:17/personal Category: DatabaseView (889)/comment (0)/rating (0/0)Overview of LocksI. Why to introduce a lockConcurrent operations on a database by multiple users

Overview of LocksI. Why to introduce a lockconcurrent operations on a database by multiple users can lead to inconsistencies in the following data:Missing UpdatesA, a, two users read the same data and modify it, and one of the user's modifications

Objective:Long time no writing, the distance from the previous article is 3 months ago, although the work is very busy, mainly still lacks the content and passion of writing, so not how to do.There were one months of continuous interview at

Statistical information is used by the query optimizer to create query plans that improve query performance by using statistics.Statistics are the object of the database, and the statistics provided are information about the table or indexed

In the actual project development, sometimes need to send a batch of SQL statement execution to the database, should avoid to send execution to the database, and should adopt the batch processing mechanism of JDBC, in order to improve the execution

Brief introductionIn SQL Server, each query will find the shortest path to achieve its own goal. If the database accepts only one connection at a time, only one query is executed. Then the query is, of course, M.F.B. s to complete the work. For most

from:http://zhangqchang.blog.163.com/blog/static/464989732009219114653226/A few examples to be picked up onlineOne*****************************************************************Merger into is a statement added by Oracle starting at 9i, from the

Database Performance Best PracticesWhen an application needs to connect to a database, the performance of the application may be impacted by the performance of the database. For example, when there is a limit to the I/O capability of the database,

Transferred from: http://www.cnblogs.com/knowledgesea/p/3714417.htmlUnderstanding Transactions and LocksTransactions: The essential tool for maintaining logical data consistency and recoverability.Lock: When multiple users access the same database

Problem description I developed a new feature of the website: need to process the online table data of the batch merge and update , yesterday afternoon released on the line, the implementation of this function, the server load suddenly

Modify the/caches/configs/system.php inside all and domain name, the former old domain name changed to a new domain name.Go to Background Settings-site management, modify the domain name of the corresponding site to the new domain name.Click the

Modify the/caches/configs/system.php inside all and domain name, the former old domain name changed to a new domain name. Go to Background Settings-site management, modify the domain name of the corresponding site to the new domain name. Click