Ryan NetApp is in another class of devices labeled NAS for Network Attached Storage. Because its connection with your server runs over a network connection, the performance is very much dependent on the speed and configuration of the network connection. As has been explained to me, and I very much stand ready to be corrected by others more knowledgeable than myself, there are 3 main classes of storage devices today. They are NAS, Direct-attached, and SAN. My understanding is that NAS tend to be the cheapest and lowest-performance and SAN are the most expensive and highest-performance. But that is just a blanket statement and probably doesn't hold in many specific situations. My personal experience with NetApp is dependent on our configuration and I can't claim that the configuration is perfect. I found the NetApp device to work really well for providing large amounts of storage at a low cost. However, I also discovered that it was really easy to overload the connection. Again, maybe you have a better network connection, I'm just judging by my experience. A standard recommendation for DBAs is to spread I/O among as many devices as possible. I found the performance of our NetApp to be much more acceptable if I could move some high I/O parts of the database to other devices. Redo logs would be a good example of something you might consider putting on any direct-attached disks you have available to you. That would relieve some of the contention over your network connection.
Dennis Williams DBA, 80%OCP, 100% DBA Lifetouch, Inc. [EMAIL PROTECTED] -----Original Message----- Sent: Thursday, September 18, 2003 6:30 PM To: Multiple recipients of list ORACLE-L i dont manage the netapp and am not a hardware person. could you explain a little better? Is netapp similiar to SAN? what is asynch I/O? ----- Original Message ----- To: "Multiple recipients of list ORACLE-L" <[EMAIL PROTECTED]> Sent: Thursday, September 18, 2003 6:24 PM > Ryan > You are probably bottlenecking on the NetApp. Probably your network link > to it. If you have some "regular" (a.k.a. direct attached) disk available, > consider using it for your redo logs. > > Dennis Williams > DBA, 80%OCP, 100% DBA > Lifetouch, Inc. > [EMAIL PROTECTED] > > > -----Original Message----- > Sent: Thursday, September 18, 2003 4:45 PM > To: Multiple recipients of list ORACLE-L > > > hmmm... when i run statspack during a big load. most of my waits are from > redo log waits and read from a staging datafile. we have all of our > datafiles on the same I/O mount. We are using a Network Appliance back end > with asynch I/O. > > are you telling me that putting these files on seperate mount points will > have no effect? I dont quite follow asynch I/O. I dont have much of a hard > ware OS background. > > I cant find any docs or articles on how to tune Parallel Operations. All I > see are basic syntax. Do you know of any? > ----- Original Message ----- > To: "Multiple recipients of list ORACLE-L" <[EMAIL PROTECTED]> > Sent: Thursday, September 18, 2003 5:24 PM > > > > If you want rules of thumb, then take CPU_COUNT+1 up to CPU_COUNT *2. > > > > I think LIO & PIO ratio is irrelevant, the most important is whether you > are > > able to construct optimal parallel execution plan, e.g. avoid excessive > > parallel slave messaging & waiting. This is mostly design and SQL issue. > > > > The number mount points is irrelevant novadays as well IMHO, especially > when > > you're using async IO, SANs & SAME like architecture. The only thing what > > comes into my mind where splitting into mount points (thus different file > > systems) helps performance wise, is that with more file systems you got > more > > file system locks and you can spread contention for these locks that way. > > > > Tanel. > > > > ----- Original Message ----- > > To: "Multiple recipients of list ORACLE-L" <[EMAIL PROTECTED]> > > Sent: Thursday, September 18, 2003 9:34 PM > > > > > > > i know there are no magic formulas, but im hoping for something better > > than trial and error. i would assume that parallel query helps most when: > > > > > > 1. are doing work off of multiple mount points. > > > 2. Have alot more LIOs to perform than PIOs(such as sorts). > > > > > > am i close on this? > > > > > > > > From: "M Rafiq" <[EMAIL PROTECTED]> > > > > Date: 2003/09/18 Thu PM 01:34:44 EDT > > > > To: Multiple recipients of list ORACLE-L <[EMAIL PROTECTED]> > > > > Subject: Re: max parallel query > > > > > > > > Tanel, > > > > You are right. There is a param parallel_automatic(I don't remember > > exact > > > > name as I don't have access to database) which should be set to true > and > > let > > > > system decide how many pq slave to be used. For max_parallel_server > > default > > > > is 5 and can be set to higher number which memory and cpu can > handle. > > It > > > > is faster because it uses all system resources at a given time. > > > > > > > > Rarallel process can be used for large batch jobs during off-peak > time. > > > > > > > > Regards > > > > Rafiq > > > > > > > > > > > > Reply-To: [EMAIL PROTECTED] > > > > To: Multiple recipients of list ORACLE-L <[EMAIL PROTECTED]> > > > > Date: Thu, 18 Sep 2003 08:39:44 -0800 > > > > > > > > There is no simple magic formula how many parallel slaves you should > > have. > > > > It all depends on your CPU and IO utilization. Yes, utilization, > because > > if > > > > your CPUs or IO are running at their limits already, you won't benefit > > from > > > > parallel execution at all. In fact PX may make the situation even > worse, > > > > because it's designed to give you the results the fastest way, not the > > most > > > > efficient way. > > > > > > > > Tanel. > > > > > > > > ----- Original Message ----- > > > > To: "Multiple recipients of list ORACLE-L" <[EMAIL PROTECTED]> > > > > Sent: Thursday, September 18, 2003 6:15 PM > > > > > > > > > > > > > We run multiple instances on the same server. My understanding is > > > > max_parallel_servers should be set to 4 x CPU. We have 4 CPUs which > > means > > > > 16. > > > > > > > > > > however, does this take into account multiple instances on the same > > > > server? > > > > > > > > > > > > > > > -- > > > > > Please see the official ORACLE-L FAQ: http://www.orafaq.net > > > > > -- > > > > > Author: <[EMAIL PROTECTED] > > > > > INET: [EMAIL PROTECTED] > > > > > > > > > > Fat City Network Services -- 858-538-5051 http://www.fatcity.com > > > > > San Diego, California -- Mailing list and web hosting > services > > > > > > --------------------------------------------------------------------- > > > > > To REMOVE yourself from this mailing list, send an E-Mail message > > > > > to: [EMAIL PROTECTED] (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). > > > > > > > > > > > > > > > > > -- > > > > Please see the official ORACLE-L FAQ: http://www.orafaq.net > > > > -- > > > > Author: Tanel Poder > > > > INET: [EMAIL PROTECTED] > > > > > > > > Fat City Network Services -- 858-538-5051 http://www.fatcity.com > > > > San Diego, California -- Mailing list and web hosting services > > > > --------------------------------------------------------------------- > > > > To REMOVE yourself from this mailing list, send an E-Mail message > > > > to: [EMAIL PROTECTED] (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). > > > > > > > > _________________________________________________________________ > > > > Send and receive larger attachments with Hotmail Extra Storage. > > > > http://join.msn.com/?PAGE=features/es > > > > > > > > -- > > > > Please see the official ORACLE-L FAQ: http://www.orafaq.net > > > > -- > > > > Author: M Rafiq > > > > INET: [EMAIL PROTECTED] > > > > > > > > Fat City Network Services -- 858-538-5051 http://www.fatcity.com > > > > San Diego, California -- Mailing list and web hosting services > > > > --------------------------------------------------------------------- > > > > To REMOVE yourself from this mailing list, send an E-Mail message > > > > to: [EMAIL PROTECTED] (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). > > > > > > > > > > -- > > > Please see the official ORACLE-L FAQ: http://www.orafaq.net > > > -- > > > Author: <[EMAIL PROTECTED] > > > INET: [EMAIL PROTECTED] > > > > > > Fat City Network Services -- 858-538-5051 http://www.fatcity.com > > > San Diego, California -- Mailing list and web hosting services > > > --------------------------------------------------------------------- > > > To REMOVE yourself from this mailing list, send an E-Mail message > > > to: [EMAIL PROTECTED] (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). > > > > > > > > > -- > > Please see the official ORACLE-L FAQ: http://www.orafaq.net > > -- > > Author: Tanel Poder > > INET: [EMAIL PROTECTED] > > > > Fat City Network Services -- 858-538-5051 http://www.fatcity.com > > San Diego, California -- Mailing list and web hosting services > > --------------------------------------------------------------------- > > To REMOVE yourself from this mailing list, send an E-Mail message > > to: [EMAIL PROTECTED] (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). > > > > -- > Please see the official ORACLE-L FAQ: http://www.orafaq.net > -- > Author: Ryan > INET: [EMAIL PROTECTED] > > Fat City Network Services -- 858-538-5051 http://www.fatcity.com > San Diego, California -- Mailing list and web hosting services > --------------------------------------------------------------------- > To REMOVE yourself from this mailing list, send an E-Mail message > to: [EMAIL PROTECTED] (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). > -- > Please see the official ORACLE-L FAQ: http://www.orafaq.net > -- > Author: DENNIS WILLIAMS > INET: [EMAIL PROTECTED] > > Fat City Network Services -- 858-538-5051 http://www.fatcity.com > San Diego, California -- Mailing list and web hosting services > --------------------------------------------------------------------- > To REMOVE yourself from this mailing list, send an E-Mail message > to: [EMAIL PROTECTED] (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). -- Please see the official ORACLE-L FAQ: http://www.orafaq.net -- Author: Ryan INET: [EMAIL PROTECTED] Fat City Network Services -- 858-538-5051 http://www.fatcity.com San Diego, California -- Mailing list and web hosting services --------------------------------------------------------------------- To REMOVE yourself from this mailing list, send an E-Mail message to: [EMAIL PROTECTED] (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). -- Please see the official ORACLE-L FAQ: http://www.orafaq.net -- Author: DENNIS WILLIAMS INET: [EMAIL PROTECTED] Fat City Network Services -- 858-538-5051 http://www.fatcity.com San Diego, California -- Mailing list and web hosting services --------------------------------------------------------------------- To REMOVE yourself from this mailing list, send an E-Mail message to: [EMAIL PROTECTED] (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).
