RE: Is this a performance issue?

From: Siva_Chintalapati <Siva_Chintalapati_at_satyam.com>
Date: Fri, 4 Aug 2000 15:56:44 +0530
Message-Id: <10579.113835@fatcity.com>

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Hi,
I did not get the concept.Can U please say me the syntax and how to apply.

Regards
Siva

> ----------
> From: Tom Best[SMTP:Tom.Best_at_bentley.com]
> Reply To: ORACLE-L_at_fatcity.com
> Sent: Wednesday, July 26, 2000 2:48 AM
> To: Multiple recipients of list ORACLE-L
> Subject: RE: Is this a performance issue?
>
> Probably means setting the pctthreshold in the IOT such that the column
> data
> is stored separate from the primary key, on another disk, thus possibly
> increasing performace.
>
> -----Original Message-----
> Sent: Tuesday, July 25, 2000 3:34 PM
> To: Multiple recipients of list ORACLE-L
>
>
>
> What are dangling columns.
>
> Regards
> Siva
>
> ----------
> Reply To: ORACLE-L_at_fatcity.com
> Sent: Tuesday, July 25, 2000 10:27 PM
> To: Multiple recipients of list ORACLE-L
>
> Unless all columns can be satisfied with an index (but you already
> knew
> that, right?).
>
> If you have are selecting 5 columns, and say, three of them make up
> an
> index, you may want to consider storing the other two in the index as
> dangling columns. Depending on your table size, joins to other tables,
> performance needs, this could be a real win...
>
> > -----Original Message-----
> > From: root_at_fatcity.com [ mailto:root_at_fatcity.com
> <mailto:root_at_fatcity.com>
> ]On Behalf Of
> > Kamesh.J.Mantri_at_citicorp.com
> > Sent: Tuesday, July 25, 2000 5:24 AM
> > To: Multiple recipients of list ORACLE-L
> > Subject: RE: Is this a performance issue?
> >
> >
> > Actually this is not a performance issue bcos when Oracle fetches
> > rows for a
> > select it does in with implicit cursor
> > which goes row by row not column by column. Even if we mention
> > a single col
> > it fetches the whole row.
> >
> > Gurus correct me I am wrong..
> >
> >
> > Kamesh.
> >
> > -----Original Message-----
> > Sent: Monday,July 24, 2000 9:07 PM
> > To: ORACLE-L
> > Cc: schanna
> >
> >
> > Gurus,
> >
> > I'm wondering if it's a performance issue if i select all the
> > columns from
> > a table even if you don't require.
> >
> > Let say I have a table which has about 50 columns in it and i need to
> get
>
> > values for only 5-10 columns. So, instead of selecting only these
> columns
>
> > I select *.
> >
> > Any idea if that screws up my performance?
> >
> >
> >
> > Santhosh Babu
> >
> > --
> > Author: Channa, Santhosh, SITS
> > INET: schanna_at_att.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).
> >
> > --
> > Author:
> > INET: Kamesh.J.Mantri_at_citicorp.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).
> >
>
> --
> Author: Glenn Travis
> INET: Glenn.Travis_at_wcom.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).
>
> --
> Author: Tom Best
> INET: Tom.Best_at_bentley.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
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> also send the HELP command for other information (like subscribing).
>

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Hi, I did not get the = concept.Can U please say me the syntax and how to apply.

<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">Tom =

Best[SMTP:Tom.Best_at_bentley.com]
 Reply To: =       ORACLE-L_at_fatcity.com
 Sent:   = Wednesday, July 26, 2000 2:48 = AM
 To: =     Multiple = recipients of list ORACLE-L
 Subject: =        RE: Is this a performance issue?

Probably means setting the = pctthreshold in the IOT such that the column data is stored separate from the primary = key, on another disk, thus possibly increasing performace.

-----Original Message----- Sent: Tuesday, July 25, 2000 3:34 = PM
 To: Multiple recipients of list = ORACLE-L

</P>
<BR>
<BR>

What are dangling columns.

<P><FONT SIZE=3D2 FACE=3D"Arial">Regards </FONT>
<BR><FONT SIZE=3D2 FACE=3D"Arial">Siva </FONT>
</P>

---------- 
 Reply = To:       ORACLE-L_at_fatcity.com Sent:   Tuesday, July 25, = 2000 10:27 PM 
 To:     Multiple = recipients of list ORACLE-L

Unless all columns can be satisfied with an index (but = you already

<BR><FONT SIZE=3D2 FACE=3D"Arial">knew </FONT>
<BR><FONT SIZE=3D2 FACE=3D"Arial">that, right?). </FONT>
</P>

If you have are selecting 5 columns, and say, three of = them make up
 an index, you may want to consider = storing the other two in the index as dangling columns.  Depending on = your table size, joins to other tables, performance needs, this could be a = real win...

> -----Original Message----- > From: root_at_fatcity.com = [ <A = HREF=3D"mailto:root_at_fatcity.com">mailto:root_at_fatcity.com</A><= FONT SIZE=3D2 FACE=3D"Arial"> <<A =
HREF=3D"mailto:root_at_fatcity.com">mailto:root_at_fatcity.com</A><= FONT SIZE=3D2 FACE=3D"Arial">>

<BR><FONT SIZE=3D2 FACE=3D"Arial">]On Behalf Of </FONT>
<BR><FONT SIZE=3D2 FACE=3D"Arial">&gt; Kamesh.J.Mantri_at_citicorp.com =
</FONT>
<BR><FONT SIZE=3D2 FACE=3D"Arial">&gt; Sent: Tuesday, July 25, 2000 =

5:24 AM 
 > To: Multiple recipients of list = ORACLE-L 
 > Subject: RE: Is this a = performance issue?

<BR><FONT SIZE=3D2 FACE=3D"Arial">&gt; </FONT>
<BR><FONT SIZE=3D2 FACE=3D"Arial">&gt; </FONT>
<BR><FONT SIZE=3D2 FACE=3D"Arial">&gt; Actually this is not a =

performance issue bcos when Oracle fetches > rows for a > select it does in with implicit = cursor 
 > which goes row by  row not = column by column.  Even if we mention

<BR><FONT SIZE=3D2 FACE=3D"Arial">&gt; a single col </FONT>
<BR><FONT SIZE=3D2 FACE=3D"Arial">&gt; it fetches the whole row. =
</FONT>
<BR><FONT SIZE=3D2 FACE=3D"Arial">&gt; </FONT>
<BR><FONT SIZE=3D2 FACE=3D"Arial">&gt; Gurus correct me I am wrong.. =
</FONT>
<BR><FONT SIZE=3D2 FACE=3D"Arial">&gt; </FONT>
<BR><FONT SIZE=3D2 FACE=3D"Arial">&gt; </FONT>
<BR><FONT SIZE=3D2 FACE=3D"Arial">&gt; Kamesh. </FONT>
<BR><FONT SIZE=3D2 FACE=3D"Arial">&gt; </FONT>
<BR><FONT SIZE=3D2 FACE=3D"Arial">&gt; -----Original Message----- =
</FONT>
<BR><FONT SIZE=3D2 FACE=3D"Arial">&gt; Sent: Monday,July 24, 2000 9:07 =

PM

<BR><FONT SIZE=3D2 FACE=3D"Arial">&gt; To: ORACLE-L </FONT>
<BR><FONT SIZE=3D2 FACE=3D"Arial">&gt; Cc: schanna </FONT>
<BR><FONT SIZE=3D2 FACE=3D"Arial">&gt; </FONT>
<BR><FONT SIZE=3D2 FACE=3D"Arial">&gt; </FONT>
<BR><FONT SIZE=3D2 FACE=3D"Arial">&gt; Gurus, </FONT>
<BR><FONT SIZE=3D2 FACE=3D"Arial">&gt; </FONT>
<BR><FONT SIZE=3D2 FACE=3D"Arial">&gt;&nbsp; I'm wondering if it's a =

performance issue if i select all the > columns from >  a table even if you don't = require. 
 > >  Let say I have a table = which has about 50 columns in it and i need to get

>  values for only 5-10 = columns. So, instead of selecting only these columns

<P><FONT SIZE=3D2 FACE=3D"Arial">&gt;&nbsp; I select *. </FONT>
<BR><FONT SIZE=3D2 FACE=3D"Arial">&gt; </FONT>
<BR><FONT SIZE=3D2 FACE=3D"Arial">&gt;&nbsp; Any idea if that screws up =

my performance?

<BR><FONT SIZE=3D2 FACE=3D"Arial">&gt; </FONT>
<BR><FONT SIZE=3D2 FACE=3D"Arial">&gt; </FONT>
<BR><FONT SIZE=3D2 FACE=3D"Arial">&gt; </FONT>
<BR><FONT SIZE=3D2 FACE=3D"Arial">&gt;&nbsp; Santhosh Babu </FONT>
<BR><FONT SIZE=3D2 FACE=3D"Arial">&gt; </FONT>
<BR><FONT SIZE=3D2 FACE=3D"Arial">&gt; -- </FONT>
<BR><FONT SIZE=3D2 FACE=3D"Arial">&gt; Author: Channa, Santhosh, SITS =
</FONT>
<BR><FONT SIZE=3D2 FACE=3D"Arial">&gt;&nbsp;&nbsp; INET: =

schanna_at_att.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

<BR><FONT SIZE=3D2 FACE=3D"Arial">&gt; the message BODY, include a line =
containing: UNSUB ORACLE-L </FONT>
<BR><FONT SIZE=3D2 FACE=3D"Arial">&gt; (or the name of mailing list you =

want to be removed from).  You may > also send the HELP command for = other information (like subscribing).

<BR><FONT SIZE=3D2 FACE=3D"Arial">&gt; </FONT>
<BR><FONT SIZE=3D2 FACE=3D"Arial">&gt; -- </FONT>
<BR><FONT SIZE=3D2 FACE=3D"Arial">&gt; Author: </FONT>
<BR><FONT SIZE=3D2 FACE=3D"Arial">&gt;&nbsp;&nbsp; INET: =

Kamesh.J.Mantri_at_citicorp.com 
 > > Fat City Network = Services    -- (858) 538-5051  FAX: (858) 538-5051 = 
 > San Diego, = California        -- Public Internet = access / Mailing Lists 
 > =

-------------------------------------------------------------------- =

<BR><FONT SIZE=3D2 FACE=3D"Arial">&gt; the message BODY, include a line =
containing: UNSUB ORACLE-L </FONT>
<BR><FONT SIZE=3D2 FACE=3D"Arial">&gt; (or the name of mailing list you =

want to be removed from).  You may > also send the HELP command for = other information (like subscribing). >

--

<BR><FONT SIZE=3D2 FACE=3D"Arial">Author: Glenn Travis </FONT>
<BR><FONT SIZE=3D2 FACE=3D"Arial">&nbsp; INET: Glenn.Travis_at_wcom.com =
</FONT>
</P>

Fat City Network Services    -- (858) = 538-5051  FAX: (858) 538-5051 San Diego, = California        -- 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

<BR><FONT SIZE=3D2 FACE=3D"Arial">the message BODY, include a line =
containing: UNSUB ORACLE-L </FONT>
<BR><FONT SIZE=3D2 FACE=3D"Arial">(or the name of mailing list you want =

to be removed from).  You may also send the HELP command for other = information (like subscribing).

<P><FONT SIZE=3D2 FACE=3D"Arial">-- </FONT>
<BR><FONT SIZE=3D2 FACE=3D"Arial">Author: Tom Best</FONT>
<BR><FONT SIZE=3D2 FACE=3D"Arial">&nbsp; INET: =

Tom.Best_at_bentley.com

Fat City Network = Services    -- (858) 538-5051  FAX: (858) = 538-5051
 San Diego, = California        -- 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 Received on Fri Aug 04 2000 - 05:26:44 CDT