To learn Oracle and DataBase the following sites will guide you.Follow these sites to lean DataBase.I hope these are help to you.
Oracle Help Sites
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www.dbasupport.com
www.oracleguru.com
www.orafans.com
www.oramag.com
www.teamdba.com
www.revealnet.com
www.dbdomain.com
www.sampoorna.com
www.dbatoolz.com
www.orapub.com
www.oraclezone.com
www.oracle-home.com
www.seachdatabase.techtarget.com
www.oracle.com/think9i
www.oracle.com/products/trail
www.devshed.com
www.oraclefoundation.org
www.metalink.oracle.com
www.oracle-base.com
www.education.oracle.com
www.asktom.oracle.com
www.tahiti.oracle.com
www.orafaq.com
www.oaug.org/
OCP Help Sites
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www.tagsystems.com/oracle.htm
www.informit.com
www.sqlcourse.com
www.sqlcourse2.com
www.dbdomain.com/dbaexam.htm
www.hot-oracle.com
www.kevinloney.com
Database Magazines
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www.dbmsmag.com
www.db2mag.com
www.oramag.com
www.tdan.com
www.elementkjournals.com/dbm/index.htm
Database Tools
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www.embarcadero.com
www.quest.com
www.cai.com/solutions/oracle/
www.datamirror.com
www.datajunction.com
www.keeptool.com
www.precise.com
www.veritas.com
www.pocketdba.com
www.esti.com
Datawarehousing Sites
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www.datawarehousing.com
www.dmreview.com
www.businessobjects.com
www.microstratagies.com
www.cognos.com
www.dw-institute.com
www.comshare.com
www.intelligententerprise.com