الجدول الوسيط او المؤقت

متابعين

بتاريخ: 12 مايو 200817 سنة

ممكن بعد ازنكم حد يجاوبني علي هذا السؤال البسيط

ما هو الجدول المؤقت او الجدول الوسيط وكيف يمكنني انشاءه وهل يعمل تاثير علي قاعدة البيانات في حاله انه يكون اكثر من مستخدم يعملو عليها وتقريبا نفس العمل

لكم جزيل الشكر

اقتباس

تقديم بلاغ

بتاريخ: 12 مايو 200817 سنة

Dear Emad,

first sorry to answer in English but it's avaliable keyboard now :rolleyes:

any way i'll explain what's the mean of Temporary Tables

---- Temporary Tables
Even prior to Oracle 8i most applications have used temporary tables to store data that is too complicated to process in a single sweep. These tables may have been in the form of database tables or PL/SQL tables. In Oracle 8i the maintenance and management of such temporary tables is taken on by the server.

Creation Of Temporary Tables
The data in a temporary table is private for the session that created it and can be session-specific or transaction-specific. If the data is to deleted at the end of the transaction the table should be defined as follows:

CREATE GLOBAL TEMPORARY TABLE my_temp_table ( column1 NUMBER, column2 NUMBER) ON COMMIT DELETE ROWS;

If on the other hand that data should be preserved until the session ends it should be defined as follows:

CREATE GLOBAL TEMPORARY TABLE my_temp_table ( column1 NUMBER, column2 NUMBER) ON COMMIT PRESERVE ROWS;

Features

If the TRUNCATE statement is issued against a temporary table, only the session specific data is trucated. There is no affect on the data of other sessions.
Data in temporary tables is automatically delete at the end of the database session, even if it ends abnormally.
Indexes can be created on temporary tables. The content of the index and the scope of the index is that same as the database session.
Views can be created against temporary tables and combinations of temporary and permanent tables.
Tempoarary tables can have triggers associated with them.
Export and Import utilities can be used to transfer the table definitions, but no data rows are processed.
There are a number of restrictions related to temporary tables but these are version specific.

good luck

اقتباس