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Home -> Community -> Mailing Lists -> Oracle-L -> RE: Histograms - When were they last created?
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Hi again Cherie,
Look at DBA_TAB_COLUMNS. It includes LAST_ANALYZED and NUM_BUCKETS, NUM_DISTINCT, LOW_VALUE, HIGH_VALUE - much more info on the histograms than USER_HISTOGRAMS. It's where to start if you want to change the number of buckets.
Lisa
-----Original Message-----
From: Cherie_Machler_at_gelco.com [mailto:Cherie_Machler_at_gelco.com]
Sent: Sunday, August 13, 2000 4:28 PM
To: Multiple recipients of list ORACLE-L
Subject: Histograms - When were they last created?
Listers,
Does the presence of a row in the user_histograms table indicate that a
histogram
has been created on that column/table?
Is there any way to tell when a histogram was last created/recreated/refreshed?
Thanks in advance,
Cherie
Cherie_Machler_at_gelco.com
-- Author: INET: Cherie_Machler_at_gelco.com 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). ------_=_NextPart_001_01C005E7.A8574610 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printableReceived on Mon Aug 14 2000 - 07:03:28 CDT
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<TITLE>RE: Histograms - When were they last created?</TITLE>
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<P><FONT SIZE=3D2>Hi again Cherie, </FONT>
</P>
<P><FONT SIZE=3D2>Look at DBA_TAB_COLUMNS. It includes =
LAST_ANALYZED and NUM_BUCKETS, NUM_DISTINCT, LOW_VALUE, HIGH_VALUE - = much more info on the histograms than USER_HISTOGRAMS. It's where = to start if you want to change the number of buckets.</FONT></P>
<P><FONT SIZE=3D2>Lisa</FONT>
</P>
<P><FONT SIZE=3D2>-----Original Message-----</FONT>
<BR><FONT SIZE=3D2>From: Cherie_Machler_at_gelco.com [<A =
HREF=3D"mailto:Cherie_Machler_at_gelco.com">mailto:Cherie_Machler_at_gelco.com=
</A>]</FONT>
<BR><FONT SIZE=3D2>Sent: Sunday, August 13, 2000 4:28 PM</FONT>
<BR><FONT SIZE=3D2>To: Multiple recipients of list ORACLE-L</FONT>
<BR><FONT SIZE=3D2>Subject: Histograms - When were they last =
created?</FONT>
</P>
<BR>
<P><FONT SIZE=3D2>Listers,</FONT>
</P>
<P><FONT SIZE=3D2>Does the presence of a row in the user_histograms =
table indicate that a</FONT>
<BR><FONT SIZE=3D2>histogram</FONT>
<BR><FONT SIZE=3D2>has been created on that column/table?</FONT>
</P>
<P><FONT SIZE=3D2>Is there any way to tell when a histogram was last =
created/recreated/refreshed?</FONT>
</P>
<P><FONT SIZE=3D2>Thanks in advance,</FONT>
</P>
<P><FONT SIZE=3D2>Cherie</FONT>
<BR><FONT SIZE=3D2>Cherie_Machler_at_gelco.com</FONT>
</P>
<BR>
<P><FONT SIZE=3D2>-- </FONT>
<BR><FONT SIZE=3D2>Author: </FONT>
<BR><FONT SIZE=3D2> INET: Cherie_Machler_at_gelco.com</FONT>
</P>
<P><FONT SIZE=3D2>Fat City Network Services -- (858) =
538-5051 FAX: (858) 538-5051</FONT>
<BR><FONT SIZE=3D2>San Diego, =
California -- Public Internet = access / Mailing Lists</FONT>
<BR><FONT =
SIZE=3D2>---------------------------------------------------------------= -----</FONT>
<BR><FONT SIZE=3D2>To REMOVE yourself from this mailing list, send an =
E-Mail message</FONT>
<BR><FONT SIZE=3D2>to: ListGuru_at_fatcity.com (note EXACT spelling of =
'ListGuru') and in</FONT>
<BR><FONT SIZE=3D2>the message BODY, include a line containing: UNSUB =
ORACLE-L</FONT>
<BR><FONT SIZE=3D2>(or the name of mailing list you want to be removed =
from). You may</FONT>
<BR><FONT SIZE=3D2>also send the HELP command for other information =
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