Can we CREATE INDEX on view in Teradata?

Can we CREATE INDEX on view in Teradata?

So while you can’t create an index on a view, you can create indices on the underlying tables, and it will change how the queries referring the view are executed.

What are indexes in Teradata?

Primary index is used to specify where the data resides in Teradata. It is used to specify which AMP gets the data row. Each table in Teradata is required to have a primary index defined.

How do I find primary index columns in Teradata?

To find out the list of indexes used in Teradata

  1. SELECT.
  2. databasename, tablename, columnname, indextype, indexnumber, indexname.
  3. FROM.
  4. dbc. indices.
  5. ORDER BY.
  6. databasename, tablename, indexnumber;

How do I view data in Teradata?

To view data in table rows. To see the data in selected columns only, select the applicable columns from the list, and then click OK. To see data in all columns, click All. Note: Step 3 applies if the Display a column selection list before browsing option is selected from the Browse tab in the Options dialog box.

What is Hashrow function in Teradata?

HASHROW function in teradata identifies hash value of the input data. Hashrow function generates the same hash if the input value is same, hash value helps in distributing the data over buckets and amps. Example. SELECT. HASHROW (‘Teradata’) AS “Hash Value”

What is the difference between a primary index and a secondary index?

A primary index is an index on a set of fields that includes the unique primary key and is guaranteed not to contain duplicates. In contrast, a secondary index is an index that is not a primary index and may have duplicates.

What is primary index and secondary index in Teradata?

A table can contain only one primary index. More often, you will come across scenarios where the table contains other columns, using which the data is frequently accessed. Teradata will perform full table scan for those queries. Secondary indexes resolve this issue.

Where is nopi table in Teradata?

How to find Teradata No Primary Index (NOPI) tables? The Teradata tablekind for NOPI tables is ‘O’. With the following SQL statement, we can find all NOPI tables in our system: SELECT * FROM DBC.

How will you find the secondary index of a table in Teradata?

The output of the Emp_Id hash will utilize the hash map to point to a specific AMP and that AMP will hold the secondary index subtable row for the secondary index value. That means the subtable row will hold the base table Row-ID, and Teradata will then find the base row immediately.

How can I see DDL in Teradata?

1 Answer

  1. Generate DDL Statements for objects: SHOW TABLE {DatabaseB}.
  2. Breakdown of columns in a view: HELP VIEW {DatabaseB}.
  3. Alternative Solution. Would it be possible to have a stored procedure created that dynamically created the table based on the view name that is provided?
  4. Possible Solution – VOLATILE TABLE.