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EXPLAIN command returns the execution plan of parsing engine in English. It can be used with any SQL statement except on another EXPLAIN command. When a query is preceded with EXPLAIN command, the execution plan of the Parsing Engine is returned to the user instead of AMPs.

Examples of EXPLAIN

Consider the table Employee with the following definition.

Some examples of EXPLAIN plan are given below.

Full Table Scan (FTS)

When no conditions are specified in the SELECT statement, then the optimizer may choose to use Full Table Scan where each and every row of the table is accessed.

Example

Following is a sample query where the optimizer may choose FTS.

When the above query is executed, it produces the following output. As can be seen the optimizer chooses to access all AMPs and all rows within the AMP.

Unique Primary Index

When the rows are accessed using Unique Primary Index, then it is one AMP operation.

When the above query is executed, it produces the following output. As can be seen it is a single-AMP retrieval and the optimizer is using the unique primary index to access the row.

Unique Secondary Index

When the rows are accessed using Unique Secondary Index, it’s a two amp operation.

Example

Consider the table Salary with the following definition.

Consider the following SELECT statement.

When the above query is executed, it produces the following output. As can be seen the optimizer retrieves the row in two amp operation using unique secondary index.

Additional Terms

Following is the list of terms commonly seen in EXPLAIN plan.

... (Last Use) …

A spool file is no longer needed and will be released when this step completes.

... with no residual conditions …

All applicable conditions have been applied to the rows.

... END TRANSACTION …

Transaction locks are released, and changes are committed.

... eliminating duplicate rows ...

Duplicate rows only exist in spool files, not set tables. Doing a DISTINCT operation.

... by way of a traversal of index #n extracting row ids only …

A spool file is built containing the Row IDs found in a secondary index (index #n)

... we do a SMS (set manipulation step) …

Combining rows using a UNION, MINUS, or INTERSECT operator.

... which is redistributed by hash code to all AMPs.

Redistributing data in preparation for a join.

... which is duplicated on all AMPs.

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Duplicating data from the smaller table (in terms of SPOOL) in preparation for a join.

... (one_AMP) or (group_AMPs)

Indicates one AMP or subset of AMPs will be used instead of all AMPs.

Overview

Teradata Studio is a Shareware software in the category Miscellaneous developed by Teradata Corporation.

The latest version of Teradata Studio is currently unknown. It was initially added to our database on 09/02/2013.

Teradata Studio runs on the following operating systems: Windows.

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