Comments on: Automatic redistribution of data warehouse data http://www.dbms2.com/2008/10/01/automatic-redistribution-of-data-warehouse-data/ Choices in data management and analysis Thu, 09 Feb 2012 13:48:12 +0000 hourly 1 http://wordpress.org/?v=3.0.3 By: Jacky http://www.dbms2.com/2008/10/01/automatic-redistribution-of-data-warehouse-data/#comment-102273 Jacky Wed, 19 Nov 2008 15:16:34 +0000 http://www.dbms2.com/?p=587#comment-102273 I confirm that teradata has to take the system offline to be able to do the redistribution..it is a critical operation that could lead to a lots of troubles if something crashes in the middle of that....! I confirm that teradata has to take the system offline to be able to do the redistribution..it is a critical operation that could lead to a lots of troubles if something crashes in the middle of that….!

]]> By: Curt Monash http://www.dbms2.com/2008/10/01/automatic-redistribution-of-data-warehouse-data/#comment-98625 Curt Monash Mon, 06 Oct 2008 15:43:06 +0000 http://www.dbms2.com/?p=587#comment-98625 Stu, No shock there, either. I'm not sure, however, that I buy the claim SPMD = "pure linear scalability with no exceptions", absent further elucidation. ;) Best, CAM Stu,

No shock there, either.

I’m not sure, however, that I buy the claim SPMD = “pure linear scalability with no exceptions”, absent further elucidation. ;)

Best,

CAM

]]> By: Stu Greenberg http://www.dbms2.com/2008/10/01/automatic-redistribution-of-data-warehouse-data/#comment-98617 Stu Greenberg Mon, 06 Oct 2008 13:38:26 +0000 http://www.dbms2.com/?p=587#comment-98617 Hi Curt, We'll be the second vendor to respond to this thread. EXASolution also has an automatic redistribution feature. No reloading is necessary. You integrate new servers by specifying MAC-adress and booting the server. The system remains accessible at all times, and it redistributes the data in the background. Since EXASolution is based on an SPMD architecture, the new servers will increase performance linearly. Regards, Stu Greenberg Hi Curt,

We’ll be the second vendor to respond to this thread.

EXASolution also has an automatic redistribution feature. No reloading is necessary. You integrate new servers by specifying MAC-adress and booting the server. The system remains accessible at all times, and it redistributes the data in the background.

Since EXASolution is based on an SPMD architecture, the new servers will increase performance linearly.

Regards,
Stu Greenberg

]]> By: Curt Monash http://www.dbms2.com/2008/10/01/automatic-redistribution-of-data-warehouse-data/#comment-98375 Curt Monash Thu, 02 Oct 2008 20:55:55 +0000 http://www.dbms2.com/?p=587#comment-98375 Hi Ajeet, I was guessing Aster might be the first vendor to respond to this thread. ;) Best, CAM Hi Ajeet,

I was guessing Aster might be the first vendor to respond to this thread. ;)

Best,

CAM

]]> By: Ajeet Singh http://www.dbms2.com/2008/10/01/automatic-redistribution-of-data-warehouse-data/#comment-98369 Ajeet Singh Thu, 02 Oct 2008 20:05:17 +0000 http://www.dbms2.com/?p=587#comment-98369 Hi Curt, I would like to mention our online scalability capabilities in this context. Aster nCluster provides online scaling, not only for storage but also for the whole system. When adding a new server to the cluster, the administrator only needs to input the MAC address of the first network interface and power on the bare-metal machine. The system automatically gets the software (including the operating system), formats the drives, configures the network, and balances the existing data and workload. All this is done in the background and the system continues to be available to users during this process. Similarly, servers can be taken out of nCluster and repurposed for other use with a single-click on the Aster Management Console without incurring any system downtime. http://www.asterdata.com/product/management.html has an overview of our manageability features. Thanks, Ajeet Hi Curt,

I would like to mention our online scalability capabilities in this context. Aster nCluster provides online scaling, not only for storage but also for the whole system. When adding a new server to the cluster, the administrator only needs to input the MAC address of the first network interface and power on the bare-metal machine. The system automatically gets the software (including the operating system), formats the drives, configures the network, and balances the existing data and workload. All this is done in the background and the system continues to be available to users during this process. Similarly, servers can be taken out of nCluster and repurposed for other use with a single-click on the Aster Management Console without incurring any system downtime.

http://www.asterdata.com/product/management.html has an overview of our manageability features.

Thanks,
Ajeet

]]> By: David Aldridge http://www.dbms2.com/2008/10/01/automatic-redistribution-of-data-warehouse-data/#comment-98346 David Aldridge Thu, 02 Oct 2008 15:34:15 +0000 http://www.dbms2.com/?p=587#comment-98346 No expertise,but here's what the docs say: "Rebalancing a disk group moves data between disks to ensure that every file is evenly spread across all of the disks in a disk group. When all of the files are evenly dispersed, all of the disks are evenly filled to the same percentage; this ensures load balancing. Rebalancing does not relocate data based on I/O statistics nor is rebalancing started as a result of statistics. ASM rebalancing operations are controlled by the size of the disks in a disk group. "ASM automatically initiates a rebalance after storage configuration changes, such as when you add, drop, or resize disks. The power setting parameter determines the speed with which rebalancing operations occur. "You can manually start a rebalance to change the power setting of a running rebalance. A rebalance is automatically restarted if the instance on which the rebalancing is running stops; databases can remain operational during rebalancing operations. A rebalance has almost no effect on database performance because only one megabyte at a time is locked for relocation and only writes are blocked." http://download.oracle.com/docs/cd/B28359_01/server.111/b31107/asmcon.htm#CJHGGECE No expertise,but here’s what the docs say:

“Rebalancing a disk group moves data between disks to ensure that every file is evenly spread across all of the disks in a disk group. When all of the files are evenly dispersed, all of the disks are evenly filled to the same percentage; this ensures load balancing. Rebalancing does not relocate data based on I/O statistics nor is rebalancing started as a result of statistics. ASM rebalancing operations are controlled by the size of the disks in a disk group.

“ASM automatically initiates a rebalance after storage configuration changes, such as when you add, drop, or resize disks. The power setting parameter determines the speed with which rebalancing operations occur.

“You can manually start a rebalance to change the power setting of a running rebalance. A rebalance is automatically restarted if the instance on which the rebalancing is running stops; databases can remain operational during rebalancing operations. A rebalance has almost no effect on database performance because only one megabyte at a time is locked for relocation and only writes are blocked.”

http://download.oracle.com/docs/cd/B28359_01/server.111/b31107/asmcon.htm#CJHGGECE

]]> By: Sanjay http://www.dbms2.com/2008/10/01/automatic-redistribution-of-data-warehouse-data/#comment-98325 Sanjay Thu, 02 Oct 2008 12:05:55 +0000 http://www.dbms2.com/?p=587#comment-98325 I think the key here is the automatic redistribution. If as they claim the data distribution is an online function and is automatic that definitely is different from, say Teradata, where you have to take an outage to redistribute the data. I think the key here is the automatic redistribution. If as they claim the data distribution is an online function and is automatic that definitely is different from, say Teradata, where you have to take an outage to redistribute the data.

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