APM 10.8 Install wipes out existing CEM tables

Products

• CA Application Performance Management (APM / Wily / Introscope)

Issue/Introduction

 We installed the EM only and the database wiped  out all the CEM (ts_*) tables. Including ts_domain which has the tb_db_version.

This is required to start an EM. (So the system did an unexpected drop table command.) 

 It also wiped out the install log.

Environment

Release : 10.7.0

Resolution

DBA to restored the 10.7.0 DB after it was wiped out. Once the DB was restored, modified the table and changed the version to 10.8.0.0

(There was no new DB installed or upgraded.  Same DB from v10.7.0_SP3 CHF60 is currently in use.  The db_versions table was modified to v10.8.0.0.)

After installing EM v10.8.0 and pointing it to that same DB, it worked fine without any ERRORs. The EM came up successfully and was able to login to the workstation.