Make Some Rows As A Read Only?

Jan 8, 2013

Oracle Version 11.2.0.1
Windows

There are some tables in a schema. How can I make some rows as a read only i.e. no user can make either any update nor delete them. After searching in google, I found that trigger is one way, but since this way can be manipulated by dropping or renaming the trigger, so I am looking non-trigger way to achieve this problem. Making tablespace read only affects other users. I am not looking whole table as a read only, just couple of rows should be locked (no DML allowed) for specific time period and I after specific time/date this restriction should auto disable or on user call i.e. something like row's block level locking..

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