Oracle

Step: 1. Create a sequence2. Create a trigger.Syntax parsing:Create sequence Tb_code_sequenceMinValue 1MaxValue 999999999999999999999999999Start with 11Increment by 1Cache 10;CREATE OR REPLACE TRIGGER tb_code_increase before insert on Tb_codeFor

First, Use system User Login Sql*plus , use the command to Scott The user unlocks and Scott The user's password is modified to: T_ three digits after your study number (ex: t_165). Then, connect the database to the Scott user. 1. use system User

Dbms_random is a package that can generate random numbers or strings.This package has several functions such as initialize (), seed (), terminate (), value (), Normal (), random (), string (), but value () is the most common, followed by the

1. Audit (Audit): The tracking records of the database activities performed by the user are easy to supervise and inspect afterwards.Audit Information storage location:Audit record information that is stored in the SYS in the system table space .

The architecture of an Oracle database consists of four aspects: the physical structure, logical structure, memory structure, and process of a database. 　　 1. Physical Structure 　　 The physical database structure is determined by the operating

Due to the expansion of the business and the requirements of the customer, the company needs to migrate the data originally running on MySQL to Oracle.The first few years of work have been short-lived, but infrequently used, and the initial

The system does not have much time to write blog, but also want to always write to insist, it is nothing to write down the accumulated knowledge points#ORACLE#jdbc. Driver=oracle.jdbc.driver.oracledriver#jdbc. Url=jdbc:oracle:thin: @IP: Port:

Download Oracle ClientOfficial: Linux x86-64Agree to the agreement and download the following documents: oracle-instantclient11.2-basic-11.2.0.4.0-1.x86_64.rpm oracle-instantclient11.2-devel-11.2.0.4.0-1.x86_64.rpm Installationrpm -

Reprint: http://czmmiao.iteye.com/blog/1304934CzmmiaoOracle PermissionsPermissions allow users to access objects or execute programs that belong to other users, and the Oracle system provides three permissions: Object-level, system-level, role-level.

1. Assign permissions with DBA LoginCreate or replace directory D_output as ' D:\TEMP ';Grant Read,write on directory d_output to TestDB;GRANT EXECUTE on Utl_file to TestDB;2. Write a function to create the directory and write the dataCalling

To add a column:ALTER TABLE TableName add ColumnName datatype (not NULL); -------One thing to note is that when adding a column that is not empty, the table must be an empty table.To delete a column:ALTER TABLE tablename DROP column ColumnNameTo

1. Installing Logminer Run the following 2 scripts as DBA users: Dbmslm.sql is used to create a DBMS_LOGMNR package to parse the log file. sql> @ $ORACLE _home/rdbms/admin/dbmslm.sql; Package created.

Comparison of deleted data DELETE statements and TRUNCATE statements for Oracle databaseWhen the data in the table is not needed, you should delete the data and free up the occupied space, and delete the data in the table using the DELETE statement

package com.ist.common.util;import java.sql.*;import javax.naming.context;import  Javax.naming.initialcontext;import javax.naming.namingexception;public class jdbcoracletest {//ORCL is the database name in the Oracle database, and localhost

--table backups in the Oracle database:--BACKUP statement: After the backup, you can delete all the data sources for this table, but then someone will manipulate the table's data, but remember to restore the data table after the operation is

The current summary of the statement, in view of the data connection is very useful, after writing the program while testing the code side to see the release of database connections to help optimize the analysis of a robust system program.1. SQL

Here, let's move on to the question left in section 2.6: What if the string to be queried contains "_" or "%"? Start today's study.2.7 How to use escaped (escape) operatorsThis task can be accomplished with an escape keyword. In order to practice,

C # executes an Oracle stored procedure with the stored procedure Code:Create or Replace procedure proc_test (pcursor as begin open for Select* from scott.emp; End Proc_tes; Where pak_pub.ut_cursor is defined as:Create or Replace Package pak_

I. oracle basic SQL statements and functions, and oraclesql Functions I. Data Definition Language (ddl) Data definition language (ddl) is used to change the database structure, including creating, changing, and deleting database objects. The Data

OracleSQL classic query trainer Article 3 Oracle SQL classic query trainer Article 3 This article is the third article about Oracle SQL classic query. It is just the author's opinion. If you have any questions, I hope you can provide suggestions or