Hi Krishna,
You can use query builder tool instead of using Audit database to fetch the CUID of any report.
Query Builder URL: http://ip-address:port/AdminTools
Query:
select SI_CUID from CI_INFOOBJECTS where SI_NAME = 'Report Name'
OR
select SI_CUID from CI_INFOOBJECTS where SI_ID = 'Report ID'
Hope this would be helpful.
~Swapnil