Oracle

Dbms_metadata some usage test learning View create table space statements SQL head pages dbms_metadata.get_ddl(,) SIZE BLOCKSIZE RESIZE     View User Creation statements SQL dbms_metadata.get_ddl(,) "TEST" IDENTIFIED

Install related dependency packages The Oracle official documents require the following packages to be installed: Check whether the system has installed related packages: When you only consider a single host, simply put, you only consider

10gR2You need to convert a common table into monthly partitions to improve query efficiency.The test is as follows:1. Create a test table SQL T(ID ID T ROWNUM,CREATED TIMING () ( Ii.

A small memory process is written in the project. The function is to record the corresponding file serial number for certain personnel types. Summary: Prefix: create or replace procedure insert_serial As is followed by the applied

I want to use the Oracle database to update data when I was building an ASP. NET Website. The fields in the table include int, string, and date. NET front-end controls always encounter problems when binding updates. I checked a lot of things online

If the table contains data, Oracle cannot modify its data type. However, you can create a temporary column, copy the data of the column to the temporary column, delete the original column, and modify the name of the temporary column. In this case,

ActiveReport can interact with multiple data sources, including OLEDB, SQL, XML, and collection objects.This article describes how to bind an Oracle database to ActiveReport.This is an easy task. The following describes the binding method for

The types of ORACLE Data Dictionary views are: USER, ALL, and DBA. USER _ *: Information about objects owned by users, that is, information about objects created by users ALL _ *: Information about objects accessible to users, that is, information

SGA)And several OracleBackground ProcessForm Memory Structure Sharing poolIncluding library cacheDictionary cache Process Structure Lsnrctl(Port:1521) User Process TablespaceAndData FilesIsOne-to-multipleAffiliated relationship

If you are familiar with ORACLE, you will find that no ready-made objects can be created. Of course, you may also say that the most SQL method is to use the identity column, and the auto-increment method is OK. However, if you want to implement

Data Pump is a 10 Gb function, and personal inverted data prefers to use data pump. During the import, the remap parameter is used to easily convert the tablespace and schema, and the character set problem between the server and the client can be

1. Modify the Oracle field type/* modify the original field name */Alter table name rename column field name TO field name 1;/* Add a field with the same name as the original field */Alter table name ADD field name VARCHAR2 (30 );/* Update the

Note that when multiple database instances are used, set ORACLE_SID = '', 1. Check whether sqlnet. ora (in the % ORACLE_HOME % NETWORKADMIN directory in WINDOWS) contains this sentence: SQLNET. AUTHENTICATION_SERVICES = (ETS). If not, add 2. Check

Today, when I was doing an exercise on Oracle query statements, I encountered A question: Find out the employee name of A, the third letter of name (ENAME) in the EMP table. The existing data in my Scott. emp table is as follows: SQL> select * from

1. first, query the daily redo log switching frequency, locate the abnormal time point, and perform rough filtering to calculate the log volume. (even if the program problem cannot be solved, you can temporarily expand the disk capacity, first, let

Create a tablespace datafile size 100M;   identified tablespace qnhouse;   Authorize a user connect,resource qnhouse; Table creation and constraints id name () PK_district_id id

  Flashback has two main functions: flashback query and flashback table/database)Enable the flashback function (you can enable database flashback only after archiving) name,flashback_on v$; system db_recovery_file_dest_size; system db_recovery_

Rman is the most cost-effective oracle backup tool. Here we will make an overall learning of rman. Most of the scripts in this article are the syntax of rman commands. It is better to do experiments to be impressed. Because most databases are backed

1, %: represents any 0 or multiple characters. It can match any type and length of characters. In some cases, if it is Chinese, use two percent signs (%.For example, SELECT * FROM [user] WHERE u_name LIKE '% 3%'We will find all records with "3",

This article mainly analyzes the ORACLE system structure and working mechanism from four different levels of Adjustment Analysis on the large database ORACLE environment, and summarizes the nine different aspects comprehensivelyORACLE Database