Oracle

After 11.2, you can rename ASM DiskGroup without having to create a new diskgroup, and then do image copy. In 11.2, in the GI home, with a command renamedg, look at the following example: RENAMEDG phase= dgname= newdgname= [asm_ Diskstring= ' '] [

Hint (hint) is undoubtedly the most basic way to control the implementation of the plan; by embedding the optimizer directive directly in the SQL statement, and then making the optimizer select hint specified execution path when executing the

Oracle autonomous transactions are stored procedures and functions that can handle internal transactions themselves and are not affected by external transactions and are declared with pragma autonomous_transaction. To create an autonomous

1 download Download Address:http://www.smartmarmot.com/product/orabbix/download/ 2 Grant executable permissions to a file #chmod +x/opt/orabbix-r#chmod +x/opt/orabbix/run.sh3 Create a file named Config.props, there are templates to refer to. #cp/

Oracle Flash-back technology , here are 4 kinds of flash back technology, the Oracle Flash-back technology to do a collation summary. Overview: The flash-back technology is part of Oracle's powerful database backup recovery mechanism, which

In the SQL statement optimization process, we often use hint, and now summarize the use of Oracle hint in the SQL optimization process: 1./*+all_rows*/ It is shown that the cost-based optimization method is chosen for the statement block, and the

Errors such as Ora-00054:resource busy and acquire with nowait specified often occur when a database user inserts, updates, deletes a table's data in a database, or adds a table's primary key or a table's index. The main reason is that a

Here's how to use an implicit cursor, and under what circumstances, to use a display cursor: 1. Query returns a single line of records → implicit cursors; 2. Query returns multiple-line records and process-by-row → explicit cursors --Display

The Oracle tutorial you are looking at is: Oracle database processing Multimedia information. Citation:For a long time, multimedia information in the computer is stored in file form, managed by the operating system, but with the development of

1 "in 12-hour system display Sql>select to_char (sysdate, ' yyyy-mm-dd HH12:MI:SS AM ') from dual;To_char (sysdate, ' YYYY-MM-DDHH1------------------------------2007-06-29 02:50:06 pm 2 "in 24-hour system display Sql> Select To_char (sysdate, '

The Oracle tutorial being looked at is the design and development of Oracle Platform application database system. Oracle is currently the most widely used database system. A complete database system includes system hardware, operating system,

The Oracle tutorial you are looking at is a number of ways to optimize the design of Oracle library tables. ObjectiveThe vast majority of Oracle database performance problems are caused by unreasonable database design, only a small number of

This article summarizes the Oracle implementation of page query SQL syntax, collation for everyone for your reference, details are as follows: 1. No order by sort of the wording. (Highest efficiency) After testing, this method costs the lowest,

Today, when you import a batch of data to Oracle, you have this problem: Toad prompted to assign to a custom variable amp, at first I was puzzled that the data is a series of INSERT statements, how can there be a custom variable? Then I searched the

Note:The prerequisite for ① recovery is that the backup is done② Full Recovery database is the database encountered a failure, at the time of recovery did not lose any of the submitted things data recoveryIncomplete recovery database is a database

The hash partition is used to determine the partition attribution of the data by using the hash algorithm on the partitioning key. What are the advantages of using a hash partition? The advantages of commonly used partitioned tables are: such as

One, query a field repeat Copy Code code as follows: SELECT * From User u where U.user_name in (select U.user_name From User u GROUP BY U.user_name has count (*) > 1) Two, delete the duplicate of a few fields in the

(i) Parameter description: (1). Rate_limit parameters are introduced from the 9.2.0.8 and can be used to control connection storms. Rate_limit is followed by the number of parameters are allowed per second, after the configuration is completed, the

Install the Oracle 11.2.0.4 database software and execute root. sh. This is nothing special.Then, we need to modify the ORACLE binary file permissions of oracle RDBMS so that the oracle database process can obtain the ASM disk group.[Root @ lunar5 ~]

InstallationFirst of all, PHP supports oracle. The first thing I think of is the pdo-related driver. After reading it, it is actually called pdo_oci. But it still depends on the oracle instant client, which needs to be downloaded from the oracle