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Status Submitted
Workspace Data Replication: Change Data Capture
Created by Guest
Created on Nov 25, 2025

RELATED IDEAS

Performance improvement for getPrimaryKeys() query for Snowflake target (Flexrep)

When the IIDR Target instance for Snowflake gets restarted, it runs the below query on Snowflake to get information about the primary keys for the tables. The query is fired for each table in the subscription. (we have 435 tables in the subscription, hence 435 times)

show /* JDBC:DatabaseMetaData.getPrimaryKeys() */ primary keys in account

Each instance of the query retrieves the primary keys for all tables in the Snowflake account which is a very inefficient way of doing it. It is not limited to the table or even schema where the table is located. We have ~5000 tables in the snowflake account, the query execution time varies from 5 seconds to 30 seconds. As a result, during a restart, there is a delay of upto 3 hours or more for the capture to push changes to target which will be crucial for us.

Since we use 'Live Audit' mapping mode for snowflake, primary keys are not relevant. So we propose the below 2 solutions

1. Do not fire getPrimaryKeys () queries if the table mapping mode is Live Audit as primary keys are not relevant in Live Audit mode.

2. If the above solution is not possible, at least update the query to such a way that it will look at the metadata for the specific table only. 

show /* JDBC:DatabaseMetaData.getPrimaryKeys() */ primary keys in table <schemaname>.<tablename>;

Needed By Yesterday (Let's go already!)

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