What is global temporary table in Teradata?
Teradata gives GLOBAL TEMPORARY option with CREATE TABLE syntax. What special ? If you create a table with GLOBAL TEMPORARY option, the life of the CONTENTS of the table will be only for the current session. They will be automatically deleted by Teradata manager once session expires. (
What is global temporary table?
The CREATE GLOBAL TEMPORARY TABLE statement creates a description of a temporary table at the current server. Each session that selects from a created temporary table retrieves only rows that the same session has inserted. When the session terminates, the rows of the table associated with the session are deleted.
What is the difference between a permanent and temporary table Teradata?
Permanent storage of tables is necessary when different sessions and users must share table contents. When tables are required for only a single session, we can request the system to create temporary tables. When the session ends, the system automatically drops the temporary table.
What are volatile tables in Teradata?
Volatile Table. Volatile tables are created, used and dropped within a user session. Their definition is not stored in data dictionary. They hold intermediate data of the query which is frequently used.
Can we collect stats on global temporary table in Teradata?
➠ Restrictions for Collect Statistics Users will get below error while refreshing collect stats on Global Temporary Table(GTT) using general syntax. User should explicitly mention TEMPORARY keyword while collecting stats on a GTT.
What is the difference between global temporary tables and volatile temporary tables?
Index can be created on Global Temporary table and not on Volatile table. Global temporary table uses Temporary space of login user and Volatile table uses spool space of login userIn a single session 2000 Global temporary table can be materialized and 1000 Volatile tables can be materialized.
What is difference between local and global temporary table?
Local temporary tables are deleted after the user disconnects from the instance of SQL Server. Global temporary tables are visible to any user and any connection after they are created, and are deleted when all users that are referencing the table disconnect from the instance of SQL Server.
Does Teradata support CTE?
In Teradata, Common Table Expression (CTE) is supported as other databases. You can create recursive CTE or use a reference of a CTE to another CTE. However there is a slight differences compared with other databases – The referenced CTE must be present after the referencing CTE.
Can we collect stats on volatile table?
Can I create statistics on a volatile table? Statistics are allowed, but when using the statement DIAGNOSTIC HELPSTAT ON FOR SESSION, we have to be aware that they are still proposed in the EXPLAIN plan. This is because they are not available to the optimizer in a DBC table.
Can we collect stats on volatile table in Teradata?
What are the different temporary tables in Teradata?
Teradata has implemented three types of temporary tables. Derived tables; Volatile temporary tables; Global temporary tables; What is the reasons to implement Temporary Tables?
Is there way to create temporary tables?
Introduction to Temporary Tables in SQL Server Preparing the Data. Let’s first prepare some dummy data. Creating A Temporary Table. There are two methods of creating temporary tables. Global Temporary Tables. Deleting a Temporary Table. Automatic Deletion. Manual Table Deletion. Temporary Tables and Stored Procedures. See Also: Ben Richardson runs Acuity Training.
What are different types of spaces available in Teradata?
databases can be given perm space.
Volatile Tables in Teradata are tables that exist only for a session and are then discarded by the system after the session ends. No DDL Data is maintained for Volatile tables.
