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<title>Indexed or Seq?</title>
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<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>If you type the syntax below in quiz you will see directly –
I would be astonished if all matching order_no rows in invoiced_detail were not
reported,<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>can clear <o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>access invoiced_master in hisdb & <br>
link order_no to order_no of invoiced_detail
in hisdb<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>report &<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'> ORDER_NO
&<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'> PRIMARY_ID
&<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'> SECONDARY_ID
&<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'> PROD_LVL0
&<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'> PROD_LVL1
&<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'> PROD_LVL2
&<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'> PROD_LVL3
&<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'> PROD_LVL4
&<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'> EVENT_ID
&<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'> PRODUCT_SEQ_NO<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<div>
<p><font size=2 color=navy face=Arial><span style='font-size:10.0pt;font-family:
Arial;color:navy'>Regards, Joe.</span></font><font color=navy><span
style='color:navy'> <o:p></o:p></span></font></p>
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<p class=MsoNormal><b><font size=2 face=Tahoma><span style='font-size:10.0pt;
font-family:Tahoma;font-weight:bold'>From:</span></font></b><font size=2
face=Tahoma><span style='font-size:10.0pt;font-family:Tahoma'>
powerh-l-bounces+atla38=dsl.pipex.com@lists.sowder.com
[mailto:powerh-l-bounces+atla38=dsl.pipex.com@lists.sowder.com] <b><span
style='font-weight:bold'>On Behalf Of </span></b>fernando.olmos@hpa.com.au<br>
<b><span style='font-weight:bold'>Sent:</span></b> 11 August 2005 00:49<br>
<b><span style='font-weight:bold'>To:</span></b> powerh-l@lists.sowder.com<br>
<b><span style='font-weight:bold'>Subject:</span></b> Indexed or Seq?</span></font><o:p></o:p></p>
</div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'><o:p> </o:p></span></font></p>
<p><font size=2 face=Arial><span style='font-size:10.0pt;font-family:Arial'>Hi
everyone,</span></font> <o:p></o:p></p>
<p><font size=2 face=Arial><span style='font-size:10.0pt;font-family:Arial'>I've
been given the task of speeding up record complexes for a master/detail set of
tables, where the detail table</span></font> <font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial'>has</span></font> <font size=2
face=Arial><span style='font-size:10.0pt;font-family:Arial'>over 3 million
records. Don't worry, I am not going to ask the obvious, but I was wondering if
someone can help me determine how QUIZ looks</span></font> <font size=2
face=Arial><span style='font-size:10.0pt;font-family:Arial'>up</span></font> <font
size=2 face=Arial><span style='font-size:10.0pt;font-family:Arial'>data for
where one the lookup field is the first field in the UNIQUE index set.</span></font><o:p></o:p></p>
<p><font size=2 face=Arial><span style='font-size:10.0pt;font-family:Arial'>Here
are the QSHOWs for the two tables in question ...</span></font> <o:p></o:p></p>
<p><font size=1 face="Courier New"><span style='font-size:7.5pt;font-family:
"Courier New"'>
Record:
INVOICED_DETAIL</span></font> <br>
<font size=1 face="Courier New"><span style='font-size:7.5pt;font-family:"Courier New"'>
of Database: #####</span></font> <br>
<font size=1 face="Courier New"><span style='font-size:7.5pt;font-family:"Courier New"'>
Organization: RELATIONAL</span></font> <br>
<font size=1 face="Courier New"><span style='font-size:7.5pt;font-family:"Courier New"'>
Null Values Allowed:No</span></font> <br>
<font size=1 face="Courier New"><span style='font-size:7.5pt;font-family:"Courier New"'>
Type:
ORACLE</span></font> <br>
<font size=1 face="Courier New"><span style='font-size:7.5pt;font-family:"Courier New"'>
Hold Cursor: Unspecified</span></font>
<br>
<font size=1 face="Courier New"><span style='font-size:7.5pt;font-family:"Courier New"'>
Open:
#####</span></font> <br>
<font size=1 face="Courier New"><span style='font-size:7.5pt;font-family:"Courier New"'>
Record Size: 558 Bytes</span></font> <o:p></o:p></p>
<p><font size=1 face="Courier New"><span style='font-size:7.5pt;font-family:
"Courier New"'>-- Record Contents --</span></font> <br>
<font size=1 face="Courier New"><span style='font-size:7.5pt;font-family:"Courier New"'>
Item
Type
Size Occ Offset</span></font> <br>
<font size=1 face="Courier New"><span style='font-size:7.5pt;font-family:"Courier New"'>r
ORDER_NO
INTEGER SIGNED 8
0</span></font> <br>
<font size=1 face="Courier New"><span style='font-size:7.5pt;font-family:"Courier New"'>r
PRIMARY_ID
CHARACTER 2
8</span></font> <br>
<font size=1 face="Courier New"><span style='font-size:7.5pt;font-family:"Courier New"'>r
SECONDARY_ID
CHARACTER
2 10</span></font> <br>
<font size=1 face="Courier New"><span style='font-size:7.5pt;font-family:"Courier New"'>r
PROD_LVL0
CHARACTER 2
12</span></font> <br>
<font size=1 face="Courier New"><span style='font-size:7.5pt;font-family:"Courier New"'>r
PROD_LVL1
CHARACTER 2
14</span></font> <br>
<font size=1 face="Courier New"><span style='font-size:7.5pt;font-family:"Courier New"'>r
PROD_LVL2
CHARACTER 2
16</span></font> <br>
<font size=1 face="Courier New"><span style='font-size:7.5pt;font-family:"Courier New"'>r
PROD_LVL3
CHARACTER
2 18</span></font> <br>
<font size=1 face="Courier New"><span style='font-size:7.5pt;font-family:"Courier New"'>r
PROD_LVL4
CHARACTER 2
20</span></font> <br>
<font size=1 face="Courier New"><span style='font-size:7.5pt;font-family:"Courier New"'>r
PRODUCT_CODE
VARCHAR
16 22</span></font>
<br>
<font size=1 face="Courier New"><span style='font-size:7.5pt;font-family:"Courier New"'>r
EVENT_ID
INTEGER SIGNED
4 38</span></font> <br>
<font size=1 face="Courier New"><span style='font-size:7.5pt;font-family:"Courier New"'>..</span></font>
<br>
<font size=1 face="Courier New"><span style='font-size:7.5pt;font-family:"Courier New"'>etc</span></font>
<br>
<font size=1 face="Courier New"><span style='font-size:7.5pt;font-family:"Courier New"'>..</span></font>
<o:p></o:p></p>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'><o:p> </o:p></span></font></p>
<p><font size=1 face="Courier New"><span style='font-size:7.5pt;font-family:
"Courier New"'>-- Index Contents --</span></font> <o:p></o:p></p>
<p><font size=1 face="Courier New"><span style='font-size:7.5pt;font-family:
"Courier New"'> ** ORDER_KEY_ID is a UNIQUE index **</span></font>
<o:p></o:p></p>
<p><font size=1 face="Courier New"><span style='font-size:7.5pt;font-family:
"Courier New"'>
Segment
Type
Size Ord Offset</span></font> <br>
<font size=1 face="Courier New"><span style='font-size:7.5pt;font-family:"Courier New"'>
ORDER_NO
INTEGER SIGNED 8
A 0</span></font> <br>
<font size=1 face="Courier New"><span style='font-size:7.5pt;font-family:"Courier New"'>
PRIMARY_ID
CHARACTER
2 A 8</span></font> <br>
<font size=1 face="Courier New"><span style='font-size:7.5pt;font-family:"Courier New"'>
SECONDARY_ID
CHARACTER 2
A 10</span></font> <br>
<font size=1 face="Courier New"><span style='font-size:7.5pt;font-family:"Courier New"'>
PROD_LVL0
CHARACTER
2 A 12</span></font> <br>
<font size=1 face="Courier New"><span style='font-size:7.5pt;font-family:"Courier New"'>
PROD_LVL1
CHARACTER
2 A 14</span></font> <br>
<font size=1 face="Courier New"><span style='font-size:7.5pt;font-family:"Courier New"'>
PROD_LVL2
CHARACTER
2 A 16</span></font> <br>
<font size=1 face="Courier New"><span style='font-size:7.5pt;font-family:"Courier New"'>
PROD_LVL3
CHARACTER
2 A 18</span></font> <br>
<font size=1 face="Courier New"><span style='font-size:7.5pt;font-family:"Courier New"'>
PROD_LVL4
CHARACTER 2
A 20</span></font> <br>
<font size=1 face="Courier New"><span style='font-size:7.5pt;font-family:"Courier New"'>
EVENT_ID
INTEGER SIGNED 4
A 22</span></font> <br>
<font size=1 face="Courier New"><span style='font-size:7.5pt;font-family:"Courier New"'>
PRODUCT_SEQ_NO
INTEGER SIGNED 4
A 26</span></font> <o:p></o:p></p>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'><o:p> </o:p></span></font></p>
<p><font size=2 face=Arial><span style='font-size:10.0pt;font-family:Arial'>Other
indexes are all REPEATING and do not reference any of the above indexes</span></font>
<o:p></o:p></p>
<p class=MsoNormal style='margin-bottom:12.0pt'><font size=3
face="Times New Roman"><span style='font-size:12.0pt'><o:p> </o:p></span></font></p>
<p><font size=1 face="Courier New"><span style='font-size:7.5pt;font-family:
"Courier New"'> Record:
INVOICED_MASTER</span></font> <br>
<font size=1 face="Courier New"><span style='font-size:7.5pt;font-family:"Courier New"'>
of Database: #####</span></font> <br>
<font size=1 face="Courier New"><span style='font-size:7.5pt;font-family:"Courier New"'>
Organization: RELATIONAL</span></font> <br>
<font size=1 face="Courier New"><span style='font-size:7.5pt;font-family:"Courier New"'>
Null Values Allowed:No</span></font> <br>
<font size=1 face="Courier New"><span style='font-size:7.5pt;font-family:"Courier New"'>
Type:
ORACLE</span></font> <br>
<font size=1 face="Courier New"><span style='font-size:7.5pt;font-family:"Courier New"'>
Hold Cursor: Unspecified</span></font>
<br>
<font size=1 face="Courier New"><span style='font-size:7.5pt;font-family:"Courier New"'>
Open:
#####</span></font> <br>
<font size=1 face="Courier New"><span style='font-size:7.5pt;font-family:"Courier New"'>
Record Size: 591 Bytes</span></font> <o:p></o:p></p>
<p><font size=1 face="Courier New"><span style='font-size:7.5pt;font-family:
"Courier New"'>-- Record Contents --</span></font> <br>
<font size=1 face="Courier New"><span style='font-size:7.5pt;font-family:"Courier New"'>
Item
Type
Size Occ Offset</span></font> <br>
<font size=1 face="Courier New"><span style='font-size:7.5pt;font-family:"Courier New"'>r
ORDER_NO
INTEGER SIGNED 8
0</span></font> <br>
<font size=1 face="Courier New"><span style='font-size:7.5pt;font-family:"Courier New"'>..</span></font>
<br>
<font size=1 face="Courier New"><span style='font-size:7.5pt;font-family:"Courier New"'>etc</span></font>
<br>
<font size=1 face="Courier New"><span style='font-size:7.5pt;font-family:"Courier New"'>..</span></font>
<o:p></o:p></p>
<p><font size=1 face="Courier New"><span style='font-size:7.5pt;font-family:
"Courier New"'>-- Index Contents --</span></font> <o:p></o:p></p>
<p><font size=1 face="Courier New"><span style='font-size:7.5pt;font-family:
"Courier New"'> ** ORDER_NO_IM is a UNIQUE index **</span></font>
<o:p></o:p></p>
<p><font size=1 face="Courier New"><span style='font-size:7.5pt;font-family:
"Courier New"'>
Segment
Type
Size Ord Offset</span></font> <br>
<font size=1 face="Courier New"><span style='font-size:7.5pt;font-family:"Courier New"'>
ORDER_NO
INTEGER SIGNED 8
A 0</span></font> <o:p></o:p></p>
<p><font size=2 face=Arial><span style='font-size:10.0pt;font-family:Arial'>Again,
there are other repeating indexes, but they are not relevant to my query.</span></font>
<o:p></o:p></p>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'><o:p> </o:p></span></font></p>
<p><font size=2 face=Arial><span style='font-size:10.0pt;font-family:Arial'>If
I link the two tables using a simple direct link, like the following ...</span></font>
<o:p></o:p></p>
<p><font size=1 face="Courier New"><span style='font-size:7.5pt;font-family:
"Courier New"'>access invoiced_master in hisdb &</span></font> <br>
<font size=1 face="Courier New"><span
style='font-size:7.5pt;font-family:"Courier New"'>link order_no to order_no of
invoiced_detail in hisdb</span></font> <o:p></o:p></p>
<p><font size=2 face=Arial><span style='font-size:10.0pt;font-family:Arial'>Will
QUIZ use the UNIQUE index defined in INVOICED_DETAIL to look its records directly,
or because the ORDER_NO column is not<b><span style='font-weight:bold'>
explicitly</span></b> defined as a primary key (not unique of course), will it
use sequential searching?</span></font><o:p></o:p></p>
<p><font size=2 face=Arial><span style='font-size:10.0pt;font-family:Arial'>I
hope I made myself clear here. If not please ask.</span></font> <o:p></o:p></p>
<p><font size=2 face=Arial><span style='font-size:10.0pt;font-family:Arial'>PS:
this email contains rich text formatting. Please forgive me if it appears in
your mailbox all over the place!</span></font> <o:p></o:p></p>
<p><font size=2 face=Arial><span style='font-size:10.0pt;font-family:Arial'>Thanks
guys.</span></font> <o:p></o:p></p>
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