RE: Histograms - When were they last created?

From: Siva_Chintalapati <Siva_Chintalapati_at_satyam.com>
Date: Wed, 16 Aug 2000 16:37:42 +0530
Message-Id: <10591.114702@fatcity.com>

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Hi,
can any body say me what is NUM_BUCKETS field used for??

Regards
Siva

> ----------
> From: Koivu, Lisa[SMTP:lkoivu_at_qode.com]
> Reply To: ORACLE-L_at_fatcity.com
> Sent: Monday, August 14, 2000 6:29 PM
> To: Multiple recipients of list ORACLE-L
> Subject: RE: Histograms - When were they last created?
>
> 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
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Hi, can any body say me = what is NUM_BUCKETS field used for??

<P><FONT COLOR=3D"#0000FF" SIZE=3D2 FACE=3D"Arial">Regards</FONT>
<BR><FONT COLOR=3D"#0000FF" SIZE=3D2 FACE=3D"Arial">Siva</FONT>
</P>
<UL>
<P><FONT SIZE=3D1 FACE=3D"MS Sans Serif">----------</FONT>
<BR><B><FONT SIZE=3D1 FACE=3D"MS Sans Serif">From:</FONT></B> &nbsp; =
<FONT SIZE=3D1 FACE=3D"MS Sans Serif">Koivu, =

Lisa[SMTP:lkoivu_at_qode.com]
 Reply To: =       ORACLE-L_at_fatcity.com
 Sent:   = Monday, August 14, 2000 6:29 = PM
 To: =     Multiple = recipients of list ORACLE-L
 Subject: =        RE: Histograms - When were they last created?

Hi again Cherie,=20

Look at DBA_TAB_COLUMNS.=A0 It = includes LAST_ANALYZED and NUM_BUCKETS, NUM_DISTINCT, LOW_VALUE, = HIGH_VALUE - much more info on the histograms than USER_HISTOGRAMS.=A0 = It's where to start if you want to change the number of = buckets.

<P><FONT SIZE=3D2 FACE=3D"Arial">Lisa</FONT><FONT FACE=3D"Arial"> =
</FONT>
</P>

-----Original Message----- 
 From: Cherie_Machler_at_gelco.com = [ <A = HREF=3D"mailto:Cherie_Machler_at_gelco.com">mailto:Cherie_Machler_at_gelco.com= </A>] 
 Sent: Sunday, August 13, 2000 4:28 = PM 
 To: Multiple recipients of list = ORACLE-L Subject: Histograms - When were they = last created?

<P><FONT SIZE=3D2 FACE=3D"Arial">Listers,</FONT><FONT FACE=3D"Arial"> =
</FONT>
</P>

Does the presence of a row in the = user_histograms table indicate that a =

</FONT>
<BR><FONT SIZE=3D2 FACE=3D"Arial">histogram</FONT><FONT FACE=3D"Arial"> =
</FONT>
<BR><FONT SIZE=3D2 FACE=3D"Arial">has been created on that =

column/table?

Is there any way to tell when a = histogram was last created/recreated/refreshed?

Thanks in advance,

<P><FONT SIZE=3D2 FACE=3D"Arial">Cherie</FONT><FONT FACE=3D"Arial"> =
</FONT>
<BR><FONT SIZE=3D2 FACE=3D"Arial">Cherie_Machler_at_gelco.com</FONT><FONT =

FACE=3D"Arial">

<P><FONT SIZE=3D2 FACE=3D"Arial">--</FONT>=20
<BR><FONT SIZE=3D2 FACE=3D"Arial">Author:</FONT>=20
<BR><FONT SIZE=3D2 FACE=3D"Arial">=A0 INET: =

Cherie_Machler_at_gelco.com

Fat City Network Services=A0=A0=A0 -- = (858) 538-5051=A0 FAX: (858) 538-5051 = 
 San Diego, = California=A0=A0=A0=A0=A0=A0=A0 -- Public Internet access / Mailing = Lists <FONT SIZE=3D2 =

FACE=3D"Arial">---------------------------------------------------------=

----------- 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).=A0 You may also send the HELP command for other = Received on Wed Aug 16 2000 - 06:07:42 CDT