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You can define one or several autonomous transactions in a transaction (outer transaction). Autonomous transactions can be commit independently and do not have an impact on external affairs, and the rollback of the same outer transaction has no

oracle| Data | database Six experiences in Oracle database system usage ----The use of the 1.having clause ----A HAVING clause to control the row groups determined by the GROUP BY clause, the HAVING clause condition allows only constants to be

Recently found a good thing on the Internet sqlapi++, it is available to access multiple SQL databases (oracle,sql server,db2,sybase,informix,interbase,sqlbase,mysql,postgresql) C+ + Library. sqlapi++ directly invokes the APIs of the local Target

The forum has a lot of discussion about deadlock, in theory, R.ramakrishnan's "Database Management Systems" also has a very incisive exposition. As far as actual development is concerned, different database environments have different processing

Reference | Reference Manual | Chinese InnoDB chinese Reference Manual---canine (heart-sail) translator InnoDB home InnoDB Engine in mysql-max-3.23.56/mysql-4.0.12 The up-to-date Reference Manual of InnoDB Updated April, 2003:added notes to section

A deadlock is a group of resources in which two or more than two threads in the execution process, in contention for a resource sometimes caused by waiting for each other, without external forces, they will not be able to advance, death may be a

In MapReduce v1, jobclient is used to interact with Jobtracker to complete job submission, the user creates a job, sets parameters through jobconf, submits and monitors the progress of the job through Jobclient, In Jobclient, there is an internal

1 IsPostBack Introduction IsPostBack is the page class has a bool-type attribute to determine whether the request for the current form is the first or not the first request. When Ispostback=true represents a non-first request, we call it postback,

Oracle With the flash-back table feature in Oracle Database 10g, you can easily recover a table that was accidentally deleted Here's what happens when it doesn't happen: the user deletes a very important table--of course accidentally--and needs to

The origin of 11.4.1 affairs When you update a database with the delete command or the update command, you can only manipulate one table at a time, which can cause data inconsistencies in the database. For example: The enterprise cancels the

If you are unfamiliar with the git command line, use the Git graphical interface tool, which is more appropriate. It is recommended that you use a tool such as Tortoisegit, which has a high cost of time from learning to flexible mastery. 1, add #

L1, L2, L3 block function:--easy to find data blocks. There is a pointer to the L3 in the L1, L2 has a pointer to L3, and a pointer and state for multiple blocks of data in the L3. 1. In each L3, there are multiple L2 addresses (the first L3 is a

relational database system itself is more complex, plus hibernate O/R mapping layer, complexity increased, very easy to appear problems, I will recently encountered problems and solutions to do a summary, sorted in the following series of articles

Iis Microsoft has tightly integrated the capabilities of IIS and COM +, which makes it very easy to leverage transactional applications in the process of programming the transaction Web page. There are many different ways to integrate the

server| Data | database Lock is a very important concept in network database, it is mainly used to guarantee database integrality and consistency under multi-user environment. The basic theory of lock used in various large databases is consistent,

BFILE binary files, stored in an operating system file outside the database, read-only. Treat this file as binary. BLOB binary Large object. A large object stored in a database, usually a file such as an image sound. CLOB large-character object.

Oracle Oracle's Sql*plus is a client tool that interacts with Oracle. In Sql*plus, you can run the Sql*plus command and the Sql*plus statement. Our usual DML, DDL, and DCL statements are sql*plus statements that, when executed, can be stored in an

One, what is a distributed database The Distributed Database System (ddbs:distributed) is developed on the basis of centralized database system. is a combination of database technology and network technology products. There are two kinds of

or refer to the previous example: Http://blog.csdn.net/kunshan_shenbin/archive/2008/09/02/2864883.aspx Modify the User.hbm.xml file as follows: "-//hibernate/hibernate Mapping DTD 3.0//en" "Http://hibernate.sourceforge.net/hibernate-mapping-3.

ADO Disclaimer: This only makes a simple analysis of concurrency conflicts, so in front of the word "talk", I hope you can see the general treatment methods and attention to the matter, if there are any omissions, it is quite natural, after all, my