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What are sessions in Teradata?

What are sessions in Teradata?

What is a Teradata session? A session is a LOGON of a user on a Teradata system, through which one or more sequential transactions can be executed. The session is terminated by a LOGOFF statement.

How can I see active sessions in Teradata?

Using MonitorSession function

  1. HostIdIn – Logical ID of a host (or client) with sessions logged on. Value -1 indicate all hosts.
  2. UserNameIn – User name of the session. An asterisk (*) indicates all users.
  3. SessionNoIn – ID of the session. A value of zero indicates all sessions.

What is schema in Teradata?

Teradata PT requires that the job script describe the structure of the data to be processed, that is the columns in table rows or fields in file records. This description is called the schema. Schemas are created using the DEFINE SCHEMA statement.

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What is Currentperm in Teradata?

CURRENTPERM column in DBC. The total number of bytes(including table headers) currently allocated to existing data tables,index tables and sub tables,stored procedures,triggers and permanent journals residing in a particular database/user. This value is maintained on each AMP.

What are BTEQ scripts?

A script is a special input file that contains BTEQ commands and Teradata SQL, and is defined as the SYSIN file for automatic execution when BTEQ is invoked.

Which mode can have multiple session in BTEQ?

You can set the number of sessions for BTEQ to process the queries in parallel manner. Users come to know the main advantage of BTEQ while specifying the sessions more than one. If you have multiple set/batch of queries which are independent to each other, then you are absolutely correct to use SET SESSIONS in BTEQ.

How do you abort a Teradata session?

By default, the ABORT SESSION request aborts the current transaction for the specified sessions and logs those sessions off the Teradata Database. The ABORT SESSION request is logged to the DBC. SW_Event_Log table (accessible from the DBC.

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How can I see tables in Teradata?

Teradata SQL Assistant for Microsoft Windows User Guide

  1. Select Tools > List Tables.
  2. Note: Wildcard characters only function when using an ODBC connection. “\%” Matches zero or more characters. Note: This field does not apply to Microsoft Access databases.

What is DBC table Teradata?

Teradata data dictionary tables are metadata tables present in the DBC database. It can be used for variety of things such as checking table size, query bottleneck and database size etc.

What is skew factor in Teradata?

Skew factor is distribution of rows of a table among the. available no. of AMP’s. If your table has a chance of using unique primary index,it.

Where is tablespace in Teradata?

To find the Table Space Size of your table across all AMPs in…

  1. SELECT DATABASENAME, TABLENAME, SUM(CURRENTPERM)
  2. FROM DBC. TABLESIZE.
  3. WHERE DATABASENAME = ” AND TABLENAME = ‘

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.