Oracle

The most basic difference: In using indexes on the primary table exists using indexes on child tables Not in does not use an index Not exists use indexes on master tables Writing: The Where condition of the exist is: "...

MySQL imports data into Oracle.To build an Oracle table:CREATETABLE"Gg_user" ("USERID"VARCHAR2 (255 BYTE)NotNull, "Ispart"VARCHAR2 (255 BYTE)DEFAULTNull, "Actualpositionid"Number (11)DEFAULTNull, "Beginworktime"TIMESTAMP (0)DEFAULTNull,

Audit audit users to see what the user is doing, and Oracle will store audit trail results in OS files or databasesActivating auditsConn/as SYSDBAShow parameter audit_sys_operations; View Audit parametersAlter system set AUDIT_SYS_OPERATIONS=TRUE

Oracle 11g starts with the ability to set a table as read-only, which prevents modifications to certain tables and provides a certain degree of security.Settings are as follows:-- Set table as read-only permission (locking) ALTER TABLE READ only ;

1. Brief description:Introduce this issue with several SQL statementsCreate a new table and insert a few data, as follows:CREATE TABLE tab1 (col1 VARCHAR2(6), col2 CHAR(6), col3 VARCHAR2(6), col4 CHAR(6) );INSERT INTO tab1 (col1, col2,

1. Create a table spaceCreate Tablespace SIRM2DataFile ' D:\oracle\product\10.2.0\oradata\orcl\SIRM2.dbf 'Size 1024M--storage address Initial size 1GAutoextend on next 10M--10M per expansion--maxsize 2024M--MaxSize Unlimited--Unlimited

First look at the current encoding formatSelect Userenv (' language ') from dual;Workaround:One, temporary solution switch to Oracle User, execute export nls_lang=american_america. ZHS16GBK problem solving. However, this method is only valid for

Delete the archive log script as follows:[Email protected] oracle]$ vim Del_archive.log#!/bin/bashExport Oracle_sid=oggmaster--instance Name/u01/app/oracle/product/11.2.0/dbhome_1/bin/rman Log=/var/log/archive_orcl.log Connect Target/Crosscheck

In oracle, how does one modify the user name and password ?, Oracle user name 1. Take the Linux operating system as an example. Enter the command sqlplus/nolog to enter the oracle console, and enter conn/as sysdba. Enter the command as a

How can I add a new instance to an Oracle database ?, Oracle instances If the SID is not specified during Oracle installation, the system will set it to orcl by default. If you forget to modify the service name during installation, or you need to

Oracle Stored Procedure demo sharing, oracle Stored Procedure demo -- 1. Define the Stored Procedure -- Definition Create or replace procedure proc01 As n int; -- add points after defining variables Begin Select count (*) into n from

Oracle user-defined function demo sharing, oracle user-defined demo Oracle UDF demo sharing Create or replace function f1 (id int) return varchar2as ename1 varchar2 (20); begin select ename into ename1 from emp where empno = id; return ename1;

Oracle trigger demo sharing, oracle trigger demo -- Trigger -- Statement-Level Trigger (executed only once) -- Trigger occurs before adding Create or replace trigger tg1after inserton emp01declare n int; begin select count (*) into n from emp01;

Oracle PL/SQL basic syntax summary, oracle basic syntax Basic Oracle PL/SQL Syntax: Declare (optional, declaring a variable or cursor) Begin (required, where the statement is executed) Exception) End; (required. The semicolon cannot be omitted from

How to Use (+) in ORACLE and how to use it in oracle (+) Is the connection For example SELECT a. *, B. * from a (+) = B is a right join, equivalent to select a. *, B. * from a right join B SELECT a. *, B. * from a = B (+) is a left join,

Solve the Problem of Automatic startup of PDBs during Oracle12c startup, oracle12cpdbs Pluggable Database (PDB) is an important new feature in Oracle 12c, but the PDB Database is not automatically opened when the 12c instance is started. In this

New features related to Oracle database performance in Oracle 12.2.0.1, 12.2.0.1oracle Changes in Oracle Database 12c Release 2 (12.2.0.1) The following are changes in Oracle Database Performance Tuning Guide for Oracle Database 12c Release 2 (12.2.

Oracle Database creation user and Database Backup Summary (required), oracle Database Backup In the process of using Oracle to develop the system, the establishment of a database user is involved, and permissions are assigned to the user. At the

ORACLE full-width digital to half-width digital method, oracle full-width digital half-width Database table test field id name age Fullwidth numeric: 123456 Halfwidth number: 123456 Difference between length and lengthb: Length (123456) 6

Solution to the problem that the table does not exist when exporting the table at or above Oracle11g. After the Oracle11g version, the system adds the parameter "deferred_segment_creation", which controls whether segment is not assigned to the new