What is primary index in Teradata?
Then, is primary index unique in Teradata?
Teradata Database Introduction to Teradata. You can create a table with a Unique Primary Index (UPI), a Non-Unique Primary Index (NUPI), or No Primary Index (NoPI). the PI is a column, or columns, that may have duplicate values. there is no PI column and rows are not hashed based on any column values.
Secondly, what is the difference between primary index and unique primary index in Teradata? Rule 5: The Primary Index of a populated table cannot be modified. Rule 6: A Primary Index has a limit of 64 columns. A Unique Primary Index (UPI) is unique and cannot have any duplicates. If you try and insert a row with a Primary Index value that is already in the table, the row will be rejected.
In this manner, what is primary and secondary index in Teradata?
A table can contain only one primary index. Teradata will perform full table scan for those queries. Secondary indexes resolve this issue. Secondary indexes are an alternate path to access the data. There are some differences between the primary index and the secondary index.
What is secondary index in Teradata?
A Secondary Index(SI) offers an alternative path to access the data. Unlike Primary Index which can only be defined at the time of table creation, a Secondary Index can be create/drop after the creation of the table also.