WHERE trunc(date) < trunc(sysdate) - $days

trunc(date) is redundant and makes the query take longer.

It is redundant as the purpose is to delete entries by the day. Truncating the date will still be the same day and not be less than the truncated sysdate. And if it is less, it would have been less even without being truncated.

It makes it take longer because it negates the use of any index and the function itself takes time. (Unless there is a function-based index there, which, silly as it may be, would make this the correct way to write the statement.)

FWIW, "FROM" is optional in a DELETE statement.

In reply to Re: Use command line argument in script by chacham
in thread Use command line argument in script by homer4all

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