Oracle

Note: 1. Temporary tablespace is used to store temporary data during sorting operations (such as large queries, index creation, and joint queries) Each user has a temporary tablespace. 2. For large operations (large queries, large-scale

According to the official Oracle documentation, when using logminer to obtain data dictionary files, you need to set the utl_file_dir parameter. However, to set this parameter, you must restart the database, some key services cannot be implemented.

-- Three methods can be implemented:-- Method 1: The version of wmsys. wm_concat Oracle must be 10 Gb or above.-- Method 2: Use sys_connect_by_path for the Oracle version 9i and below-- Method 3: Use User-Defined Functions -- I will give you an

Oracle 9i Database MIGRATION PROCESS   Author: Unknown Database movement often occurs during project implementation. For experienced DBAs, database

We recommend that you use the following methods and Suggestions after testing! 17.Use the table alias (alias) When connecting multiple tables in an SQL statement, use the table alias and prefix the alias on each column. in this way, the parsing

/*A simple 2 phase XA demo. Both the branches talk to different rmsNeed 2 Java enabled 8.1.6 databases to run this demo.-> Start-1-> Start-2-> Do some DML on 1-> Do some DML on 2-> End 1-> End 2-> Prepare-1-> Prepare-2-> Commit-1-> Commit-2Please

Oracle Data Mining functions and AlgorithmsOracle Data Mining API supports prediction and description mining functions. Prediction function, which uses training data to predict a target value. Describes a function to identify the inherent

/**************************** V_index is a primary key statement. Tablename is the table name. Written by: Wonder Modified: ****************************/ Create or replace procedure prc_delete (v_index in varchar2, tablename in varchar2) isV_ SQL

1. Install the 10.2.0.4 patch, install Database Vault, and enter https: // localhost: 1158/DVA to indicate an HTTP 500 error. Answer: when installing the vault, an error is prompted when you run the vault config assist configuration assistant. You

New Features of Oracle 10g R2 TDE In the latest version of Oracle 10g R2, the most timely technology should be transparent data encryption technology (TDE ). This technology is included in Oracle Advanced Security Options. The cost per processor is

Database security has always been one of the focuses of attention. We know that if a database of an enterprise or institution is attacked by hackers, these databases store very important data, databases such as banks and communications have

Ubuntu10.04, UBUNTU 9, Gridengine6.2.4   Follow these steps   1. Install master node Sudo aptitude install gridengine-client gridengine-common gridengine-master gridengine-qmon   2. Add slave/Master Ip & hostname in/etc/hosts in Master/Slave

In actual work, we often encounter a problem when building a custom search engine, that is, implementing some type of paging function. That is to say, you can submit a query that returns many rows of data, but only the first 20 rows are displayed.

Method 1:Delete form tb_channel A where a. rowid in(Select max (B. rowid) from tb_channle BWhere a. policyno = B. policyno and A. classcode = B. classcode ); -- This method is generally slow when the data record exceeds 0.1 million.   Method 2: --

########################### Use of complex query statements ####### ##############################1. Use of query statementsThe SELECT statement and subquery can be used to return data from one or more tables, views, and entities. 1.1 Related

Problem 1: to load the JDBC driver: Normally, there are three ways to load the driver: 1) class. forname (string) is used to initialize the static content of the driver when loading a class specified by a string in classloader. In fact, the driver

During this time, I started to learn about the storage process. The main reason is because of work needs. I thought it was very simple. However, after some setbacks, I was exhausted, but I finally succeeded, in order to avoid detours for later users,

Connection between J2EE applications and Oracle databases Author: Hong Jian In J2EE application development, establishing a connection between an application and a database is a common problem. Here I will talk about connecting to the Oracle

Use JDBC to modify the Oracle sequence step in batches Scenario After the data migration is complete, you need to reset the sequence in the database ,. Method Three Common Methods Delete-recreate In this way, Simple Sequence reconstruction will

Autonomous transactions Summarize and analyze the problems encountered in the field. The core issue is that the Oracle transaction commit mechanism is not fully understood, and Oracle autonomous transactions are ignored.   Definition An autonomous