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1. Concept REDO Log is a mechanism that Oracle has established to ensure that committed transactions are not lost. In fact, the existence of the redo log is prepared for two scenarios, one we call instance recovery (INSTANCE RECOVERY), one we call

In practical applications, when we are ready to hand over a project to the customer for use, we need to clear all the tables in the library before the test data to give the customer a clean database, if the table involved a lot, to be emptied, not

oracle| Data Oracle's BLOB field is special, he is much better than a long field, and can be used to save binary data, such as pictures. It is very different to write a BLOB field and write to another type of field, because the BLOB itself has a

js| Insert | Dynamic Code:-------------------------------------------------------------------------------- Shipping List Shipping List Ordering Unit: Demo retailer Date: 2002-02-25 Order Number: Item No. Production lot

After the system crashes, use the DB2 transaction log to recover the database. How many times have you encountered the error message "sql0946c The transaction log for the"? When trying to solve the problem, do you stop to think about the following

Open the Trunks directory and create a new two text file in the Trunks directory A.java,b.java: Open A.java and enter the following: The B.java file can be entered randomly, and this example is used primarily to observe the

In the definition of transaction given in the previous article, the reader of the information should see a method called Depedentclone. This method is used to create a dependent transaction (DependentTransaction) that is based on an existing

ASP.net Our previous chapters describe how to display information in a database and the basic usage of DataReader and datasets. Have a friend say not enjoyable, want me to write the following chapter quickly, very sorry, I really do not have much

Tutorials | data | database Chapter III: Application database to create dynamic Web pages section Fourth: Adding records to the database Before the database was not recorded in order to test the convenience we directly manipulate the database,

Whether the design of database model is reasonable can greatly affect the performance of the system. Based on the experience of designing and using database for many years, the author puts forward the following Accounting principles for the

"Guide" This paper presents the principle of flashback function, describes the use of Oracle 9i or Oracle 10g Flash-back function to recover accidental loss of data methods. Objective Human error is one of the important reasons for the failure of

My.ini (Linux system is my.cnf), when the MySQL server is started, it will read this file, set the relevant operating environment parameters. My.ini is divided into two pieces: Client section and Server section. Client section is used to configure

1. The main library encountered a ORA-01093 error while carrying out a physical master repository role conversion Sql> select Switchover_status from V$database; Switchover_status -------------------- SESSIONS Active----------has active sessions.

Dynamic Network Forum 7.0 since the release has further expanded its reputation in the field of ASP forum and praise, whether in the art, performance, security and efficiency than the previous version of a great progress. The only thing I feel when

oracle| program | stored Procedure | recordset Tip: In Oracle8i, if you need to return a result set through a stored procedure, you need to use a cursor! CREATE OR REPLACE PACKAGE Body "Sms_pay". Smsmaint " Is --Functional Description: Inquiry

DG's core function is to provide high availability disaster, so the role-switching content described in this section is the most important part of DG. The role switching between DG Master and slave Libraries is divided into the following two kinds:

Database concurrent access, where two or more users access the same data at the same time, is the biggest problem for the database engine to design and implement a moderate response. A well-designed, performance-capable database engine can easily

Why the introduction of transactional concepts The transaction is the concurrent control mechanism commonly used in the current mainstream database system. What is a transaction Transactions have the following 4 most important characteristics, which

Two days ago, I wrote an article about a series of regular functions such as length to handle LOB types, and someone mentioned in the blog reply that using length is more efficient than dbms_lob. GetLength Low, here's a simple test. Create a test

What is a distributed transaction The traditional solution based on database local transaction can only guarantee the atomicity, isolation, consistency and persistence of single service processing, but it can't guarantee the consistency of