Re: Oracle invents time machine - optimizer now faster than light.

You mean a soft parse is allowed to finish before it starts ?

Or maybe it has to be a soft parse, by SYS, on a recursive statement that uses the rule-based optimiser ;)

Jonathan Lewis
http://www.jlcomp.demon.co.uk

Author of:
Practical Oracle 8i: Building Efficient Databases

Next Seminar - Australia - July/August
http://www.jlcomp.demon.co.uk/seminar.html

Host to The Co-Operative Oracle Users' FAQ http://www.jlcomp.demon.co.uk/faq/ind_faq.html

-----Original Message-----
To: Multiple recipients of list ORACLE-L <ORACLE-L_at_fatcity.com> Date: 23 April 2002 13:02
light.

|Hello Jonathan,
|
|isn't it soft parse (mis=0) ?
|
|regards...
|
|Jonathan Lewis wrote:
|
|> Look carefully at the following (genuine) extract
|> from a 9.0.1.3 trace file, and examine the TIM=
|> entries:
|>
|> PARSING IN CURSOR #2 len=210 dep=1 uid=0 oct=3 lid=0
|> tim=1019495629365212 hv=787810128 ad='6e0a278'
|> select /*+ rule */ bucket_cnt, row_cnt, cache_cnt, null_cnt,
|> timestamp#, sample_size, minimum, maximum, distcnt, lowval, hival,
|> density, col#, spare1, spare2, avgcln from hist_head$ where obj#=:1
|> and intcol#=:2
|> END OF STMT
|> PARSE
|>

#2:c=0,e=492,p=0,cr=0,cu=0,mis=0,r=0,dep=1,og=3,tim=1019495629365100
|>
|> Note how Oracle has managed to finish parsing the
|> statement 112 microseconds before it started.
|>
|> Now that's how to pass a benchmark !
|>

-- 
Please see the official ORACLE-L FAQ: http://www.orafaq.com
-- 
Author: Jonathan Lewis
  INET: jonathan_at_jlcomp.demon.co.uk

Fat City Network Services    -- (858) 538-5051  FAX: (858) 538-5051
San Diego, California        -- Public Internet access / Mailing Lists
--------------------------------------------------------------------
To REMOVE yourself from this mailing list, send an E-Mail message
to: ListGuru_at_fatcity.com (note EXACT spelling of 'ListGuru') and in
the message BODY, include a line containing: UNSUB ORACLE-L
(or the name of mailing list you want to be removed from).  You may
also send the HELP command for other information (like subscribing).