Oracle

Foreword: Sometimes, due to certain needs, we must know the case of Oracle's form being used, in terms of which we make decisions, for example, if a form is used very often, then the relevant SQL code of this form should be prioritized to reduce the

GXPT is a distributed system, this system temporarily contains the authority system, basic system, evaluation system, examination system, each system has its own Oracle database. Our group is responsible for the evaluation of the teaching system,

The syntax for merge is as follows:MERGE [hint] into [schema.] table [T_alias] USING [schema.] {Table | view | subquery} [T_alias] On (condition) when matched and merge_update_clause when not matched then merge_insert_clause;What is merge and how is

with Oracle vitual Box cloning a virtual machineWhen we need to use more than one virtual machine, if a single installation, it is too troublesome. Therefore, the general virtual machine software provides us with the ability to clone the existing

Today, a netizen sent for help information, said a social security comprehensive management system of the connection of an Oracle user is frequently locked, use alter user XX account unlock unlocked one will still be locked, use Plsql login prompt

Content of this article Server environment Client environment Overview Start the database Close the database Add Resources This article describes the start-up and shutdown of Oracle databases, although

One, character functionsThe character function is the most commonly used function in Oracle, so let's see what the character functions are:Lower (char): converts a string to a lowercase format.Upper (char): converts a string to an uppercase

After successfully installing Oracle 11g, a total of 7 servicesThe meanings of these seven services are:1. Oracle ORCL VSS Writer Service:Oracle Volume Mapping copy write service, VSS (Volume Shadow Copy service) enables the creation of

(1) If the external transaction is revoked, will the trigger-formed change be revoked? If the trigger operation fails, it causes external SQL to fail, causing the transaction to be revoked(2) When the transaction is rolled back, whether the

There are three reasons why the Ora-12560:tns: Protocol adapter error is a problem:1. The monitoring service is not up. Windows platform: Start---program---management tools---services, open the Services panel,Start the Oraclehome92tnslistener

1. Deterministic function--Create deterministic PV function.CREATE OR REPLACE FUNCTIONPV (Future_value Number, periods Number, Interest Number )RETURN Number Deterministic isBEGIN RETURNFuture_value/((1 +Interest/ -)**periods);ENDPv2.

A certain day at noon, there are users to reflect the system problems, said the process sent abnormal, to do not disappear, to do not open and so on. Maintenance engineer began to analyze the problem, the background clearer phenomenon is the flow

Chapter II ASM INSTANCEASM Instance Type:After 10g, the Oracle instance type adds an ASM type, and the parameter instance_type=asm is set.ASM Instance startup command: Startup NomountLaunching instances and background processes, but not mounting

A sudden whim today let a stored procedure call a cursor returned by another stored procedure, a demo that you write yourselfInternal stored procedure (V_ID is an incoming parameter, result_cursor is an outgoing stored procedure, placed in

Application: Known field name, querying all data tables in the database that contain the field nameAction: Specify the field name, database table user, execute the following query statement can--oracle Build query contains all data table record

Oracle Data Import Export IMP/EXPFunction: Oracle data import and export imp/exp is comparable with Oracle data restore and backup.In most cases, the data can be backed up and restored with Oracle data import and export (no loss of data).Oracle has

1. Introduction of affairsTransactions in oracle11g are implicitly auto-initiated and do not require the user to display execution start transaction statements. However, for the end-of-transaction processing, the user is required to do the specified

CHAPTER 10 ASM Persistent Data Structures Like traditional file systems and volume managers, ASM stores metadata to describe and track the content of a disk group. All metadata descriptions are stored in the composition and content of the above ASM

Oracle Installation Based on Linux is a time-consuming and laborious task, because it is only the rpm package, kernel parameters, the creation of users and so on all these steps make those new users confused. Once they are not careful, they will

This is also a boring problem. Although the problem is too big, let's look for it! Oracle has not been installed for a long time, today when the installation of 11g, with PLSQL Developer Connection, there is a common problem: ORA-12154 TNS cannot