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Oracle: What do locks actually do?

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Oracle: What do locks actually do?
posted Feb 13, 2015 by Archana

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1 Answer

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If you just want to prevent any other session from modifying the data you can issue

LOCK TABLE whatever
/

This blocks other sessions from updating the data but we cannot block other peple from reading it.

Note that in Oracle such table locking is rarely required, because Oracle operates a policy of read consistency. Which means if we run a query that takes fifteen minutes to run the last row returned will be consistent with the first row; in other words, if the result set had been sorted in reverse order we would still see exactly the same rows.

For more details: http://www.cs.kent.edu/~wfan/link/dbapre/dbatest/54920f.htm

answer Feb 13, 2015 by Amit Kumar Pandey
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