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NO_CPU_COSTING hint [message #666345]

Mon, 30 October 2017 10:09

srinivas.k2005
Messages: 404
Registered: August 2006

Senior Member

Hello,

Good day!!

In one of the queries where we are joining too many tables/view was having the execution plan cost around 3091219.
When I used the hint, /*+ NO_CPU_COSTING */ cost has come doing nearly 50% to 1412267.

Please let us know, if we can use the same or will it have any impact in future. The execution time is also better.

Thanks,
SRK

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Re: NO_CPU_COSTING hint [message #666348 is a reply to message #666345]

Mon, 30 October 2017 11:31

John Watson
Messages: 8997
Registered: January 2010
Location: Global Village

Senior Member

Most likely your system stats are wrong or missing. You should gather them rather than using a hint to cover this up.

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Re: NO_CPU_COSTING hint [message #666350 is a reply to message #666348]

Tue, 31 October 2017 02:09

srinivas.k2005
Messages: 404
Registered: August 2006

Senior Member

Thank you!!

Regards,
SRK

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Re: NO_CPU_COSTING hint [message #666353 is a reply to message #666350]

Tue, 31 October 2017 03:09

John Watson
Messages: 8997
Registered: January 2010
Location: Global Village

Senior Member

If you post the results of SELECT * FROM SYS.AUX_STATS$ the cause of the problem may become clear.

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