Database Administrator

When updating a table, Oracle will add a tmlock to the table before submission to ensure that the table structure will not change.At this time, if another session executes the alter or drop command on the table, the following error message is

When I first came into contact with Oracle, I created a before delete trigger, but always reported "Warning: The created trigger has a compilation error". Finally, I found that the statement in the trigger did not write a semicolon. The following

For the development environment, install Oracle 10g on Windows Server 2008 R2 performanise64-bit system. Downloaded from the official Oracle websiteOracle Database 10GRelease 2 (10.2.0.4) for Microsoft Windows Vista x64, Microsoft Windows Server 2008

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,

ORA-02095: failed to modify the specified initialization parameters: Alter session set processes = 100; An error is reported because the value of isses_modifiable in the processes attribute is false; Some parameters cannot be modified dynamically.

MongoDB usage notes 1. Installation Package http://www.mongodb.org/downloads Ii. server use LINUX version: ① Use tar-zxvfmongodb-linux-x86_64-1.2.4.tgz to decompress the installation package ② Mkdir-p/data/db create directory ③ Cd/data/db go to the

The test Department reported that the Intranet 1.105Oracle database service could not be started, or opened the alter _ . log file in a regular manner to view the log Content: Fri Nov 11 11:46:09 2011Errors in

One of the show_space versions written by Tom is commonly used for Bucket analysis. Create Or Replace ProcedureShow_space (p_segnameInVarchar2, P_ownerInVarchar2Default User, P_typeInVarchar2Default 'Table', P_partitionInVarchar2Default Null)As

Date typeDate includes year, month, day, hour, minute, and secondTimestamp this is an extended (timestamp) timestamp of the date data type of Oracle9i. Image Type Blob binary data can store pictures and sounds for 4 GB Oracle table management Create

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

Blob refers to the writing of a Binary Large Object, that is, the English Binary Large Object, and Clob refers to the writing of a Large Character Object, that is, the English Character Large Object. This type is designed to store a large amount of

Mysql is indeed the most popular database. Since mysql5.5.8, mysql's source code package compilation and installation have to be compiled using cmake. There is no essential difference in the compilation process, but it is much more intuitive. Mysql

1: get/load access to a single piece of data Public Teacher getTeacherById (Long id ){ Return (Teacher) this. hibernateTemplate. get (Teacher. class, id ); } Public Teacher getTeacherById (Long id ){ Return (Teacher) this.

This experiment is to restore the spfile: SQL> shutdown immediate;Database closed.Database dismounted.Oracle instance shut down.SQL> startup nomount;ORACLE instance started. Total System Global Area 335544320 bytesFixed Size 1219280 bytesVariable

I haven't checked my Oracle for a long time. I'm afraid I forgot my password. I just plan to use TOAD to check my ORACLE. When I open the connection, an error is returned: ORA-12514 TNS listeners currently cannot identify request services in

I. Basic Information OS: RHEL 3 CPU: 4 Intel (R) Xeon (TM) mp cpu 2.70 GHz Mem: 8 GB Swap: 16 GB Disk: 120 GB Oracle Database 10g Enterprise Edition Release 10.1.0.3.0Ii. Backup Mode The database runs in archive mode and supports multi-level

It is mainly used to store database fields with a large amount of data. It can store up to 4 GB of unstructured data.This section describes the storage of character type and binary file type LOB data, and separately introduces the storage of binary

Oracle trigger simple table instance Create table dwuser. T1 (OLD_VALUE NUMBER (7,2 ),NEW_VALUE NUMBER (7,2 ),UP_DATE DATE );Create table dwuser. EMP (empno number (4 ),ENAME VARCHAR2 (10 BYTE ),JOB VARCHAR2 (9 BYTE ),Mgr number (4 ),Hiredate

The following describes the sequence and trigger used to create a table using the Oracle Client. We will record their usage: The sequence is created and the trigger is used to implement auto-increment of the table's primary key. First, create a

This command uses a statement to update and insert data to a table from one or more data sources. in Oracle 9i, the UPDATE and INSERT keywords must be specified at the same time. ORACLE 10g has made the following changes.1. insert and update are