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Home -> Community -> Mailing Lists -> Oracle-L -> RE: Index creation and locking
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Linda, Lisa,
Index update locks the row it updates.
Bitmap indexes though, as they use different mechanism, locks the block it updates, and because the bitmap index holds lots of information in one block, it means lock of large amount of data.
Bitmap indexes are not good for updates, as they grow in space as well as locking problems. They are intended for data warehousing.
HTH,
Ronen Levit
Database group manager
Talmai
Tel: +972 8 9460606 #212 Fax: +972 8 9460705 Cell: +972 52 448699
-----Original Message-----
From: Koivu, Lisa [mailto:lkoivu_at_qode.com]
Sent: Monday, August 14, 2000 3:00 PM
To: Multiple recipients of list ORACLE-L
Subject: RE: Index creation and locking
Linda,
I have seen this happen with 'resource busy and acquired with nowait specified' error returned to a user trying to query a table while (bitmap) index creation is running. However, it was not consistent.
Heck, try it out and see what you end up with. Let us know.
Lisa
-----Original Message-----
From: Linda Hagedorn [ mailto:Linda_at_pets.com <mailto:Linda_at_pets.com> ]
Sent: Friday, August 11, 2000 8:47 PM
To: Multiple recipients of list ORACLE-L
Subject: Index creation and locking
Does index creation lock the underlying records or table for the duration of
the creation, and subsequently interfere with other transactions, such as on-line?
-- Author: Linda Hagedorn INET: Linda_at_pets.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_01C00609.3DEB40A0 Content-Type: text/html; charset="iso-8859-1"Received on Mon Aug 14 2000 - 11:03:52 CDT
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<TITLE>RE: Index creation and locking</TITLE>
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<DIV><FONT color=#0000ff face=Arial size=2><SPAN class=057370016-14082000>Linda,
Lisa,</SPAN></FONT></DIV>
<DIV><FONT color=#0000ff face=Arial size=2><SPAN
class=057370016-14082000></SPAN></FONT> </DIV>
<DIV><FONT color=#0000ff face=Arial size=2><SPAN class=057370016-14082000>Index
update locks the row it updates.</SPAN></FONT></DIV>
<DIV><FONT color=#0000ff face=Arial size=2><SPAN
class=057370016-14082000></SPAN></FONT> </DIV>
<DIV><FONT color=#0000ff face=Arial size=2><SPAN class=057370016-14082000>Bitmap
indexes though, as they use different mechanism, locks the block it updates, and because the bitmap index holds lots of information in one block, it means lock of large amount of data. </SPAN></FONT></DIV>
<DIV><FONT color=#0000ff face=Arial size=2><SPAN
class=057370016-14082000></SPAN></FONT> </DIV>
<DIV><FONT color=#0000ff face=Arial size=2><SPAN class=057370016-14082000>Bitmap
indexes are not good for updates, as they grow in space as well as locking problems. They are intended for data warehousing.</SPAN></FONT></DIV>
<DIV><FONT color=#0000ff face=Arial size=2><SPAN
class=057370016-14082000></SPAN></FONT> </DIV>
<DIV><FONT color=#0000ff face=Arial size=2><SPAN
class=057370016-14082000>HTH,</SPAN></FONT></DIV>
<DIV><FONT color=#0000ff face=Arial size=2><SPAN
class=057370016-14082000></SPAN></FONT> </DIV>
<DIV><FONT color=#0000ff face=Arial size=2><SPAN class=057370016-14082000>
<P><FONT face=Arial size=2>Ronen Levit</FONT> <BR><FONT face=Arial
size=2>Database group manager</FONT> <BR><FONT face=Arial size=2>Talmai</FONT>
<BR><FONT face="Courier New" size=2>Tel: +972 8 9460606 #212</FONT>
<BR><FONT face="Courier New" size=2>Fax: +972 8 9460705</FONT> <BR><FONT
face="Courier New" size=2>Cell: +972 52 448699</FONT> </P></SPAN></FONT></DIV>
<BLOCKQUOTE style="MARGIN-RIGHT: 0px">
<DIV align=left class=OutlookMessageHeader dir=ltr><FONT face=Tahoma size=2>-----Original Message-----<BR><B>From:</B> Koivu, Lisa [mailto:lkoivu_at_qode.com]<BR><B>Sent:</B> Monday, August 14, 2000 3:00 PM<BR><B>To:</B> Multiple recipients of list ORACLE-L<BR><B>Subject:</B> RE: Index creation and locking <BR><BR></DIV></FONT> <P><FONT size=2>Linda, </FONT></P> <P><FONT size=2>I have seen this happen with 'resource busy and acquired with nowait specified' error returned to a user trying to query a table while (bitmap) index creation is running. However, it was not consistent. </FONT></P> <P><FONT size=2>Heck, try it out and see what you end up with. Let us know.</FONT> </P> <P><FONT size=2>Lisa</FONT> </P><BR><BR> <P><FONT size=2>-----Original Message-----</FONT> <BR><FONT size=2>From: Linda Hagedorn [<A href="mailto:Linda_at_pets.com">mailto:Linda_at_pets.com</A>]</FONT> <BR><FONT size=2>Sent: Friday, August 11, 2000 8:47 PM</FONT> <BR><FONT size=2>To: Multiple recipients of list ORACLE-L</FONT> <BR><FONT size=2>Subject: Index creation and locking </FONT></P><BR> <P><FONT size=2>Does index creation lock the underlying records or table for the duration of</FONT> <BR><FONT size=2>the creation, and subsequently interfere with other transactions, such as</FONT> <BR><FONT size=2>on-line? </FONT></P><BR> <P><FONT size=2>-- </FONT><BR><FONT size=2>Author: Linda Hagedorn</FONT> <BR><FONT size=2> INET: Linda_at_pets.com</FONT> </P> <P><FONT size=2>Fat City Network Services -- (858) 538-5051 FAX: (858) 538-5051</FONT> <BR><FONT size=2>San Diego, California -- Public Internet access / Mailing Lists</FONT> <BR><FONT size=2>--------------------------------------------------------------------</FONT> <BR><FONT size=2>To REMOVE yourself from this mailing list, send an E-Mail message</FONT> <BR><FONT size=2>to: ListGuru_at_fatcity.com (note EXACT spelling of 'ListGuru') and in</FONT> <BR><FONT size=2>the message BODY, include a line containing: UNSUB ORACLE-L</FONT> <BR><FONT size=2>(or the name of mailing list you want to be removed from). You may</FONT> <BR><FONT size=2>also send the HELP command for other information (like subscribing).</FONT>
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