Database Administrator

1. OOM Introduction Object-OrientedModel (OOM) object-oriented model. An OOM contains a series of packages, classes, interfaces, and their relationships. These objects form a class structure of all (or part) the logic of a software system design

OracleCSService cannot be started: 1. for network connection problems, check the priority of public and private NICs; and check whether the network connection is normal 2. Shared Disk: Check whether the drive letter is set and whether the shared

If you are familiar with Oracle databases, I think you will not be familiar with Thomas Kyte. The asktom.oracle.com website hosted by Tomas has been well-known in the Oracle field for decades and is far from Lucky. Recently, in the library, I

Use JDBC to update and query database instances:   PackageOrg. Oracle. insert; ImportJava. SQL. Connection; ImportJava. SQL. DriverManager; ImportJava. SQL. ResultSet; ImportJava. SQL. Statement;

Logon username for Linux: Oracle Sqlplus/as sysdba Alter system set OS _authent_prefix = ''scope = spfile; Startup force; Create user oracle identified externally; Grant connect to oracle; Exit the current session and then su to oracle Exit

To enable Oracle to the nomount state on Windows, enter the following command without starting the oracle service: C: \> sqlplus/nolog SQL * Plus: Release 10.2.0.1.0-Production on Friday October 14 16:28:13 2011 Copyright (c) 1982,200 5,

In actual application, multiple insert statements may be executed at a time. I know two ways to share with you: 1. Write the statement block in tools such as PLSQL between begin end, for example: Begin Insert into table values (....); Insert

Select f. tablespace_name,A. total,U. used,F. free,Round (u. used/a. total) * 100) "% USED ",Round (f. free/a. total) * 100) "% FREE"From (select tablespace_name, sum (bytes/(1024*1024) totalFrom dba_data_filesGroup by tablespace_name),(Select

BecauseAUD $Audit-related tables such as tables are stored inSYSTEMTherefore, to avoid affecting system performanceSYSTEMTablespace.AUD $Move to another tablespace. You can use the following statement to move: Oracle@www.bkjia.com ~ $

Some students need to insert images into the table in their projects. The following provides a method for your reference: 1. Create a table. Note: The columns to insert images must be defined as BLOB. Create table image_lob (t_id varchar2 (5) not

ORA-14452: attempt to create, alter or drop an index on temporary table already in use Procedure:1. First query the object_id of the table from user_objects:Select object_id from user_objects where object_name = upper ('ggs _ stick '); 2. Know the

In pl/SQL tools, you need to change the value of a field in a line: Method 1. Repeat the table to edit the data. In this way, you can see the data you want to change at a glance when the data volume is small. However, when the data volume is

Open PL/SQL Developer today and see the "ORA-12154: TNS: unable to resolve the specified connection identifier" error, which can be connected before, is to connect to my local machine. View listener-enabled; The configuration of the tnsnames. ora

When importing historical data, there is a list query, and the query is normal before the data is imported, but the query error occurs after the data is imported, debug debugging finds that there is a to_number field in the SQL statement that has

A table is the most basic logical unit for storing data in a database. It consists of rows and columns. Oracle divides the table into heap table and index organization table (IOT) and temporary table (temporary table) This section briefly introduces

CUBE and ROLLUP are new SQL keywords since Oracle8i. 9i and-11G are not new. It is an extension of the GROUP BY clause, allows you to calculate the subtotal of different levels in the SELECT statement. CUBE is another extension of the group by

This is an example of Tom's in-depth database architecture. Back up a table to an external file Create table gftuserOrganization external(Type Oracle_datapumpDefault directory tmpLocation ('test0801. dmp '))AsSelect * from all_objects From

This is because em cannot find the corresponding font file when generating the button image. Solution: In the Oracle user environment 1. Apply the default font configuration file Cd $ ORACLE_HOME/jdk/jre/lib/ Cp font. properties. zh_CN.RedHat

I. Syntax:TRANSLATE (string, from_str, to_str)Ii. Purpose Replace each character in from_str with a string after the corresponding character in to_str. TRANSLATE Is a superset of the functions provided by REPLACE. If from_str is longer than to_str,

The control file is a very important file. Only when the instance reads the control file can it be mounted. One principle of DBA is multi-channel control files. Today I did an experiment and learned this. The Code is as follows: