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CAN I lock sys or system user in oracle

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I've ECC 6.0 system with Oracle 12C
My security auditor keeps saying I should lock sys and system account in DB.
I know I can still log on to SYS user by as sysdba.

I've locked those 2 users in dev system and it does not seem to have any problem.

Can I lock sys and system user in oracle?. Will it cause any problems?

Learn more about the SAP Support user and program here.
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Running SAP is not using sys user or system user, you can lock them, and your SAP will run fine.

However SAP hostagent may user sysdba to log on (as fall back), please check note ##2146596.
And sometime brtools is using sysdba log on (not see real issues), as some functions fall back, please lock the users, and monitor the db13 jobs.