MySQLTalk.org MYSQL discussions groups   Archives   FAQ   Search   Memberlist   Usergroups   Register   Profile   Log in to check your private messages   Log in  2 replica,2 fragments, will need 4 data nodes???          MySQLTalk.org Forum Index -> MySQL Cluster Discussion View previous topic :: View next topic   Author Message xian liu Guest Posted: Fri Apr 20, 2007 5:12 am    Post subject: 2 replica,2 fragments, will need 4 data nodes??? Hi guys, 1. At "Basic MySQL Cluster Concepts" , "Chapter 15. MySQL Cluster", In 5.0/5.1 ref manual, there is a phase which define the "data node" concept. It said," Data node: ... ...For example, with two replicas, each having two fragments, you will need four data nodes. ... ..." but I think this kind of configuration can be implemented with two data nodes, no need four data nodes. right?? 2. What is the Fragment? Whether or not two fragments mean that a table is divided to two parts by horizon ? thanks a lot!!! @@@^_^@@@ --------------------------------- ÇÀ×¢ÑÅ»¢Ãâ·ÑÓÊÏä-3.5GÈÝÁ¿£¬20M¸½¼þ£¡ Back to top Andrew Hutchings Guest Posted: Fri Apr 20, 2007 10:10 am    Post subject: Re: 2 replica,2 fragments, will need 4 data nodes??? xian liu wrote: Quote: Hi guys, 1. At "Basic MySQL Cluster Concepts" , "Chapter 15. MySQL Cluster", In 5.0/5.1 ref manual, there is a phase which define the "data node" concept. It said," Data node: ... ...For example, with two replicas, each having two fragments, you will need four data nodes. ... ..." but I think this kind of configuration can be implemented with two data nodes, no need four data nodes. right?? 2. What is the Fragment? Whether or not two fragments mean that a table is divided to two parts by horizon ? thanks a lot!!! Hi Xian, If you just used 2 data nodes it would be 1 fragment and 2 replicas. As the data is split between the fragments and for redundancy you need replicas of the fragments. I guess you could think of it a little like RAID 0+1. Or if you had just 2 data nodes (or any amount without fragments) it would be a bit like RAID 1. Regards Andrew -- Andrew Hutchings - Linux Jedi - http://www.linuxjedi.co.uk/ Windows is the path to the darkside...Windows leads to Blue Screen. Blue Screen leads to downtime. Downtime leads to suffering...I sense much Windows in you. Back to top David Li Guest Posted: Sat Apr 28, 2007 3:49 pm    Post subject: Re: 2 replica,2 fragments, will need 4 data nodes??? Hi, Quote: Hi guys, 1. At "Basic MySQL Cluster Concepts" , "Chapter 15. MySQL Cluster", In 5.0/5.1 ref manual, there is a phase which define the "data node" concept. It said," Data node: ... ...For example, with two replicas, each having two fragments, you will need four data nodes. ... ..." but I think this kind of configuration can be implemented with two data nodes, no need four data nodes. right?? 2. What is the Fragment? Whether or not two fragments mean that a table is divided to two parts by horizon ? fragment is simply a synonym for partion. BR. David Li Quote: thanks a lot!!! @@@^_^@@@ --------------------------------- ÇÀ×¢ÑÅ»¢Ãâ·ÑÓÊÏä-3.5GÈÝÁ¿£¬20M¸½¼þ£¡ Back to top Display posts from previous: All Posts1 Day7 Days2 Weeks1 Month3 Months6 Months1 Year Oldest FirstNewest First         MySQLTalk.org Forum Index -> MySQL Cluster Discussion All times are GMT Page 1 of 1   Jump to: Select a forum MySQL----------------MySQL and JavaMySQL AnnouncementsMySQL++MySQL and .NETMySQL ODBCMySQL and PerlDatabase BenchmarksMySQL BugsMySQL Cluster DiscussionMySQL CommunityMySQL DocumentationEventum DevelopmentEventum General DiscussionMySQL General DiscussionMySQL GUI ToolsMySQL InternalsMySQL CommitsMaxDBMySQL PackagersMySQL Replication DiscussionBrisbane MySQL Users GroupMySQL on Win32  You cannot post new topics in this forum You cannot reply to topics in this forum You cannot edit your posts in this forum You cannot delete your posts in this forum You cannot vote in polls in this forum Powered by phpBB © 2001, 2006 phpBB Group SEO toolkit © 2004-2006 webmedic.