SSC-FDM-0021

Create Index Not Supported

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Description

Due to architectural reasons, Snowflake does not support indexes so, SnowConvert will comment out all the code related to the creation of indexes. Snowflake automatically creates micro-partitions for every table that help speed up the performance of DML operations, the user does not have to worry about creating or managing these micro-partitions.

Usually, this is enough to have a very good query performance however, there are ways to improve it by creating data clustering keys. Snowflake's official page provides more information about micro-partitions and data clustering.

Example Code

Input Code (Oracle):

IN -> Oracle_01.sql

CREATE INDEX index1
ON table1(column1);

Output Code:

OUT -> Oracle_01.sql

----** SSC-FDM-0021 - CREATE INDEX IS NOT SUPPORTED BY SNOWFLAKE **
----** SSC-FDM-0007 - MISSING DEPENDENT OBJECT "table1" **
--CREATE INDEX index1
--ON table1(column1)
                  ;

Recommendations

• Data clustering might be a way to speed up query performance on tables.

• If you need more support, you can email us at [email protected]