InstantForum.NET v4.1.4FranklinFaces.com - Oracle & SQL Server Database Forums for all IT Professionalshttp://www.franklinfaces.com/no-reply@FranklinFaces.comThu, 09 Feb 2012 11:16:39 GMT20http://www.franklinfaces.com/Topic97-97-1.aspx<H2 class=sect1 id=insertedID3><FONT face="Times New Roman" color=#111111 size=2>Here is some info on RMAN channels. You can open up quite a few channels but you need to be careful based on your OS and DB Configurations because it'll have a performance impact on your system.</FONT></H2><H2 class=sect1> </H2><H2 class=sect1>RMAN Channels</H2><P><A id=sthref217 name=sthref217></A><A id=sthref218 name=sthref218></A>The RMAN client directs database server sessions to perform all backup and recovery tasks. What constitutes a session depends on the operating system. For example, on Linux, a server session corresponds to a server process, whereas on Windows it corresponds to a thread within the database service.</P><P>The RMAN client itself does not perform backup, restore, or recovery operations. When you connect the RMAN client to a target database, RMAN allocates server sessions on the target instance and directs them to perform the operations.</P><P><A id=sthref219 name=sthref219></A><A id=sthref220 name=sthref220></A><A id=sthref221 name=sthref221></A><A id=sthref222 name=sthref222></A>An RMAN <A id=sthref223 name=sthref223></A><A id=sthref224 name=sthref224></A><A href="http://download.oracle.com/docs/cd/B28359_01/backup.111/b28270/glossary.htm#i432240"><SPAN class=xrefglossterm>channel</SPAN></A> represents one stream of data to a device, and corresponds to one database server session. The channel reads data into PGA memory, processes it, and writes it to the output device. See <A href="http://download.oracle.com/docs/cd/B28359_01/backup.111/b28270/rcmtunin.htm#i1006104">"Basic Concepts of RMAN Performance Tuning"</A> for a low-level description of how channels work.</P><P class=glossterm id=insertedID37><A id=BRADV90120 name=BRADV90120></A>channel</P><P>An RMAN channel represents one stream of data to or from a backup device. A channel can either be a <CODE>DISK</CODE> channel (used to perform disk I/O) or an <A href="http://download.oracle.com/docs/cd/B28359_01/backup.111/b28270/glossary.htm#CHDCCBFI"><SPAN class=xrefglossterm>SBT</SPAN></A> channel (used to perform I/O through a third-party <A href="http://download.oracle.com/docs/cd/B28359_01/backup.111/b28270/glossary.htm#i432922"><SPAN class=xrefglossterm>media manager</SPAN></A>). Each allocated channel starts a new Oracle server session. The server session then performs backup, restore, and recovery operations.</P><P>Hope this helps.</P><P>Thanks,Mon, 26 Oct 2009 11:00:55 GMTAdminhttp://www.franklinfaces.com/Topic97-97-1.aspxHow many channels we configure in RMANSat, 24 Oct 2009 01:50:37 GMTdbakprhttp://www.franklinfaces.com/Topic97-97-1.aspxWhat is RMAN? </P><P>You can discuss anything related to RMAN here.Wed, 04 Mar 2009 13:03:15 GMTAdmin