ASM snapshots and ACFS

I've been playing with 11gr2, asm and ACFS.. I saw the new snapshot technology and I thought wahooo.... I've worked with netapp in my previous job, and I loved the snapshot technology. I was thinking this would be the same..
You would put your files on a "cooked" file system, put your database in backup, snap, then take out of backup.. backup your snap.. Run into an issue , and you "snap back".. even better for dataguard.. You shutdown your Physicaly standby, snap the volume.. make your standby read write.. do you testing, then snap back and put back in recover.. easy as pie.
I have a number of questions after looking at ACFS.
1) There is no snapback ?? do I have this right ? you can create and delete, but you can't snap back?
2) Oracle ACFS does not support any file that can be directly stored in Oracle ASM. This is right out of the manual.. If you look up "any file that can be stored in oracle ASM" you find datafiles, controlfiles. archive logs, datapump files. This means that oracle will not the support using ACFS for your database files that you would most likely want to snap?
3) What do people see as the use of snapshots if you can't use them for database files, or are people going to put database files onto ACFS volumes regardless of the above statement ?
Personally I would love to put my archive logs, and datapump files on a "cooked" filesystem.. Database files are fine on ASM. This statement worries me too
"Create Oracle Database data files directly on Oracle ASM storage for best performance because Oracle ACFS does not support directIO for file read and write operations in 11g Release 2 (11.2)."

I'm not experienced with ASM snapshots, but I'll implement it on my VBOX TEST RAC within minutes, so I'll be able to give you a more specific answer, but...
¿What's the point in having incremental point-in-time recovery for archivelog (incremental backup) and/or datapumps (full logical backups)? Don't you find it a bit too-much redundant?
In fact, I'm interested into testing it specially for saving backup time and space in databases with high DML transactions per second, so I could put them in NOARCHIVELOG or even in NOLOG mode (As ASM Snapshots claims to be a consistent point-in-time-recovery backup).
Anyway. I'll provide you more feed back as soon as I test empirically your questions, but as far as I'm concerned, direct I/O is not recommended (or even available) on Linux 64bits, which is the more common and extended (and preferred by my own as well) combination. But Metalink is not available at the moment so anyway I'll have to wait to ensure you the answer as I might be confused with the ext3 filesystem recommendation.
Best regards,
Enric Moya

Similar Messages

Difference between ASM Disk Group, ADVM Volume and ACFS File system

Q1. What is the difference between an ASM Disk Group and an ADVM Volume ?
To my mind, an ASM Disk Group is effectively a logical volume for Database files ( including FRA files ).
11gR2 seems to have introduced the concepts of ADVM volumes and ACFS File Systems.
An 11gR2 ASM Disk Group can contain :
ASM Disks
ADVM volumes
ACFS file systems
Q2. ADVM volumes appear to be dynamic volumes.
However is this therefore not effectively layering a logical volume ( the ADVM volume ) beneath an ASM Disk Group ( conceptually a logical volume as well ) ?
Worse still if you have left ASM Disk Group Redundancy to the hardware RAID / SAN level ( as Oracle recommend ), you could effectively have 3 layers of logical disk ? ( ASM on top of ADVM on top of RAID/SAN ) ?
Q3. if it is 2 layers of logical disk ( i.e. ASM on top of ADVM ), what makes this better than 2 layers using a 3rd party volume manager ( eg ASM on top of 3rd party LVM ) - something Oracle encourages against ?
Q4. ACFS File systems, seem to be clustered file systems for non database files including ORACLE_HOMEs, application exe's etc ( but NOT GRID_HOME, OS root, OCR's or Voting disks )
Can you create / modify ACFS file systems using ASM.
The oracle toplogy diagram for ASM in the 11gR2 ASM Admin guide, shows ACFS as part of ASM. I am not sure from this if ACFS is part of ASM or ASM sits on top of ACFS ?
Q5. Connected to Q4. there seems to be a number of different ways, ACFS file systems can be created ? Which of the below are valid methods ?
through ASM ?
through native OS file system creation ?
through OEM ?
through acfsutil ?
my head is exploding
Any help and clarification greatly appreciated
Jim

Q1 - ADVM volume is a type of special file created in the ASM DG. Once created, it creates a block device on the OS itself that can be used just like any other block device. http://docs.oracle.com/cd/E16655_01/server.121/e17612/asmfilesystem.htm#OSTMG30000
Q2 - the asm disk group is a disk group, not really a logical volume. It combines attributes of both when used for database purposes, as the database and certain other applications know how to talk "ASM" protocol. However, you won't find any general purpose applications that can do so. In addition, some customers prefer to deal directly with file systems and volume devices, which ADVM is made to do. In your way of thinking, you could have 3 layers of logical disk, but each of them provides different attributes and characteristics. This is not a bad thing though, as each has a slightly different focus - os file system\device, database specific, and storage centric.
Q3 - ADVM is specifically developed to extend the characteristics of ASM for use by general OS applications. It understands the database performance characteristics and is tuned to work well in that situation. Because it is developed in house, it takes advantage of the ASM design model. Additionally, rather than having to contact multiple vendors for support, your support is limited to calling Oracle, a one-stop shop.
Q4 - You can create and modify ACFS file systems using command line tools and ASMCA. Creating and modifying logical volumes happens through SQL(ASM), asmcmd, and ASMCA. EM can also be used for both items. ACFS sits on top of ADVM, which is a file in an ASM disk group. ACFS is aware of the characteristics of ASM\ADVM volumes, and tunes it's IO to make best use of those characteristics.
Q5 - several ways:
1) Connect to ASM with SQL, use 'alter diskgroup add volume' as Mihael points out. This creates an ADVM volume. Then, format the volume using 'mkfs' (*nix) or acfsformat (windows).
2) Use ASMCA - A gui to create a volume and format a file system. Probably the easiest if your head is exploding.
3) Use 'asmcmd' to create a volume, and 'mkfs' to format the ACFS file system.
Here is information on ASMCA, with examples:
http://docs.oracle.com/cd/E16655_01/server.121/e17612/asmca_acfs.htm#OSTMG94348
Information on command line tools, with examples:
Basic Steps to Manage Oracle ACFS Systems

User for ADVM and ACFS Volume management

Hi I am getting confused which user to use for ADVM and ACFS management.
I want to create a new volume and ACFS.
My normal grid and db admin user is "oracle" in the group 'oinstall". For the ACFS setup, I have granted the oracle user with root privileges.
No I want to create a new volume in ADVM using "ASMCMD". No matter whether I create the volume with the root user, or the oracle user., the volume is assigned to the following user:
[root@grid1 asm]# ll /dev/asm/
total 0
brwxrwx---. 1 root oinstall 251, 194561 Mar 24 10:15 volume1-380
Is this correct?
Because when I do (as the oracle user):
sudo /sbin/acfsutil registry -a /dev/asm/volume1-380 /srv/u01/app/acfsmounts/myacfs
The privileges are:
[oracle@grid1 app]$ ll
total 16
d---------. 3 root root 4096 Mar 24 10:51 acfsmounts
[root@grid1 acfsmounts]# ll
total 4
drwxr-xr-x. 4 root root 4096 Mar 24 10:32 myacfs
Now the condition is as follow:
As oracle user:
no access at all on both nodes:
[oracle@grid1 acfsmounts]$ ls
ls: cannot open directory .: Permission denied
[oracle@grid2 acfsmounts]$ ls
ls: cannot open directory .: Permission denied
As root user:
On node1, I can do everything:
[root@grid1 myacfs]# echo "dadwad" > dawdawd.txt
--> SUCCESS
But on node2, I cant create a file:
[root@grid2 myacfs]# cat dawdawd.txt
--> SUCCESS
[root@grid2 myacfs]# echo "dawd" > newfile
-bash: newfile: Permission denied

Please refer "Basic Steps to Manage Oracle ACFS Systems"
Creating an Oracle ACFS File System
http://docs.oracle.com/cd/E11882_01/server.112/e18951/asmfs_util001.htm#OSTMG94787
I believe you can succeed by following the steps described in the documentation, so if you get any issue just post here.

The future of Snapshot, and similar tools.

My apologies for posting this twice. I posted it first as a follow up
to an old thread in ...
novell.support.zenworks.desktop-management.6x.install-setup
I am quoting some comments made in that forum.
Then after surfing the forums for awhile, I thought the issue might get
more attention, if I posted it here. I am looking for ideas and advice
on the future of snap shot, and any tools that Novell might provide to
replace it.
If I could address some of these comments, in hopes of better
understanding ...
RE: >>>
> Most companies invest in packaging tools such the full version of
> AdminStudio to create deployment packages. They then use their desktop
> management suites to deploy those packages.
Admin Studio is not cheap. After a client has spend thousands of
dollars to implement ZENWorks, now I have to tell them to drop another
couple thousand down for an application packager. I also don't fully
understand Novell's relationship with the product, they don't seem to be
partnering well together, I'd appreciate anyone else's read on this
relationship.
RE: >>
> Novell has for over 5 years now been trying to steer people from
> Snapshot
I've heard that statement made verbally by many engineers, but I don't
always see the practice following that.
Has Novell ever gone on record to state they will no longer support snap
shot???
RE: >> > If your snapshots are failing with the latest versions of
snapshot, then
> most likely your software package falls outside the scope of what
> snapshot should be trying to handle.
Maybe I've just gotten lucky? I've have not had many issues with using
snapshot, and I have been involved in a wide variety of applications.
I have seen the statement made on the forum that ZEN Works is not really
a "Packaging" suite. While that may be a true statement, because
Snapshot has been packaged with the product for so long, the mind set of
customers is that it is expected to work, and be supported.
I look forward to additional comments on this matter.

Tom,
I'm not sure what exactly are you searching for? ZdM is already providing
you with snapshot replacement - AdminStudio ZfD edition, included in ZfD
price.
AdminStudio part for preparing snapshot MSI is identical in ZfD and
Professional edition.
All comments you qouted (including this one) are personal opinions - I
suggest you to try AdminStudio ZfD edition and make your own.
Denis
"tom" <[email protected]> wrote in message
news:[email protected]...
> My apologies for posting this twice. I posted it first as a follow up to
> an old thread in ...
>
> novell.support.zenworks.desktop-management.6x.install-setup
>
> I am quoting some comments made in that forum.
>
> Then after surfing the forums for awhile, I thought the issue might get
> more attention, if I posted it here. I am looking for ideas and advice on
> the future of snap shot, and any tools that Novell might provide to
> replace it.
>
>
> If I could address some of these comments, in hopes of better
> understanding ...
>
> RE: >>>
> > Most companies invest in packaging tools such the full version of
> > AdminStudio to create deployment packages. They then use their desktop
> > management suites to deploy those packages.
>
> Admin Studio is not cheap. After a client has spend thousands of dollars
> to implement ZENWorks, now I have to tell them to drop another couple
> thousand down for an application packager. I also don't fully understand
> Novell's relationship with the product, they don't seem to be partnering
> well together, I'd appreciate anyone else's read on this relationship.
>
> RE: >>
> > Novell has for over 5 years now been trying to steer people from
> > Snapshot
>
> I've heard that statement made verbally by many engineers, but I don't
> always see the practice following that.
>
> Has Novell ever gone on record to state they will no longer support snap
> shot???
>
>
> RE: >> > If your snapshots are failing with the latest versions of
> snapshot, then
> > most likely your software package falls outside the scope of what
> > snapshot should be trying to handle.
>
> Maybe I've just gotten lucky? I've have not had many issues with using
> snapshot, and I have been involved in a wide variety of applications.
>
> I have seen the statement made on the forum that ZEN Works is not really a
> "Packaging" suite. While that may be a true statement, because Snapshot
> has been packaged with the product for so long, the mind set of customers
> is that it is expected to work, and be supported.
>
> I look forward to additional comments on this matter.

How to cancel email notification from snapshot and simulation

Hi,
We've activated workflow template WS28700001 so that email notification can be triggered when task release. Meanwhile we are using snapshot and simulation at the same time. But when saving sanpshot or simulation the tasks which have status of released also trigger email nofitication. How to cancel this notification of snapshot and simulation?
Regards.

Hi Ravi
I have added a Container Element(version) in workflow template WS28700001 and set a workflow start condition as follows.
&Task.Version& = ' '
Regards
Yemi

SQL Server 2008 R2 Replication - not applying snapshot and not updating all repliacted columns

We are using transactional replicating on SQL Server 2008 R2 (SP1) using a remote distributor. We are replicating from BaanLN, which is an ERP application to up to 5 subscribers, all using push publications.
Tables can range from a couple million rows to 12 million rows and 100's of GBs in size.
And it's due to the size of the tables that it was designed with a one publisher to one table architecture.
Until recently it has been working very smooth (last four years)) but we have come across two issues I have never encountered.
While this has happen a half dozen times before, it last occurred a couple weeks ago when I was adding three new publications, again a one table per publication architecture.
We use standard SS repl proc calls to create the publications, which have been successful for years.
On this occasion replication created the three publications, assigned the subscribers and even generated the new snapshot for all three new publications.
However, while it appeared that replication had created all the publications correctly from end to end, it actually only applied one of the three snapshot and created the new table on both of the new subscribers (two on each of the
publications). It only applied the snapshot to one of the two subscribers for the second publications, and did not apply to any on the third.
I let it run for three hours to see if it was a back log issue.
Replication was showing commands coming across when looking at the sync verification at the publisher and
it would even successfully pass a tracer token through each of the three new publications, despite there not being tables on either subscriber on one of the publishers and missing on one of the subscribers on another.
I ended up attempting to reinitialize roughly a dozen times, spanning a day, and one of the two remaining publications was correctly reinitialized and the snapshot applied, but the second of the two (failed) again had the same mysterious result, and
again looked like it was successful based on all the monitoring.
So I kept reinitializing the last and after multiple attempts spanning a day, it too finally was built correctly.
Now the story only get a little stranger. We just found out yesterday that on Friday the 17th
at 7:45, the approximate time started the aforementioned deployment of the three new publications,
we also had three transaction from a stable and vetted publication send over all changes except for a single status column.
This publication has 12 million rows and is very active, with thousands of changes daily.
, The three rows did not replicate a status change from a 5 to a 6.
We verified that the status was in fact 6 on the publisher, and
5 on both subscribers, yet no messages or errors. All the other rows successfully updated.
We fixed it by updating the publication from 6 back to 5 then back to 6 again on those specific rows and it worked.
The CPU is low and overall latency is minimal on the distributor.
From all accounts the replication is stable and smooth, but very busy.
The issues above have only recently started. I am not sure where to look for a problem, and to that end, a solution.

I suspect the problem with the new publication/subscriptions not initializing may have been a result of timeouts but it is hard to say for sure. The fact that it eventually succeeded after multiple attempts leads me to believe this. If this happens
again, enable verbose agent logging for the Distribution Agent to see if you are getting query timeouts. Add the parameters
-OutputVerboseLevel 2 -Output C:\TEMP\DistributionAgent.log to the Distribution Agent Run Agent job step, rerun the agent, and collect the log.
If you are getting query timeouts, try increasing the Distribution Agent -QueryTimeOut parameter. The default is 1800 seconds. Try bumping this up to 3600 seconds.
Regarding the three transactions not replicating, inspect MSrepl_errors in the distribution database for the time these transactions occurred and see if any errors occurred.
Brandon Williams (blog |
linkedin)

Snapshot and backup

Hello BW Experts,
Current Scenario:
There is a daily snapshot of the BW system in nite for our Production server. During this they have to stop any jobs / loads running at that time.
Secondly they take a backup every weekend. They stop any jobs / loads during that time also.
Wondering if you could provide ur experiences, that would very great of you..
1) Is snapshot necessary every day?
2) what is the alternative to daily snapshot?
3) what is the best procedure for daily snapshot ?
4) is there a procedure not to stop the loads / jobs during snapshot ?
5) Is backup necessary every weekend?
6) what is the alternative to weekly backup?
7) what is the best procedure for weekly backup ?
8) is there a procedure not to stop the loads / jobs during backup ?
9) is there any doc / paper / link / notes for the snapshots and backups for BW production system.
10)what is the typical time taken for snapshot?
11) what is the typical time taken for backup ?
any does please mail to [email protected]
Thanks,
BWer

Thanks for the valuable info Mimosa.
In our company, they call the snapshot: copy of the production box to the box on the SAN network. The copy is made to the disc. Here the snapshot disc is on RAID 0 and production disc is on RAID 5. They do this every night.
In our company backup is : taking copy to the tape. they do this every weekend.
Its interesting that they do the 'split mirror on-line backup' daily during system is available to all users & jobs. Wondering if you have any details of this backup. What is the procedure called. What level is this copy done, on the database level, network functionality or sap functionality.....?
Suggestions appreciated.
Thanks,
BWer

How to Export Snapshots and Materlized View in Oracle 9i

Hi,
How to Export Snapshots and Materlized View in Oracle 9i .
I require to Migrate from 9i to 10g with either Export or Script.
Please help

Using exp-imp for snapshots generally causes problems, at least for me. I would prefer taking their creation scripts and running them on the new database.
By the way, what do you mean by "migrate from 9i to 10g"? Are you trying to create the same snapshots in another (10g) database or are you trying to upgrade your 9i database to 10g? If it is the latter then you can just upgrade the database automatically with the upgrade assistant or manually using upgrade scripts.

Snapshot and Trend report web template

Hi Experts,
In a webtemplate I have 2 queries. Snapshot and trend. The snapshot tab displays the top 20 customers and the trend tab should display the trend for all the top 20 customers based on the snapshot condition.
also I need to display all the individual graphs of the top 20 customers in the same trend tab.
Can anyone put some light on this.
Regards,
Shashi.

HI Rahul,
Thanks for your quick reply. Can you be more clear. How to pass the state using java commands. one more thing, Is it possible to display the graphs of all the individual top XX customers on the same tab? If possible can you please provide the steps.
Regards,
Shashi.

Does SAP use SQL server's snapshot and transactional replication?

Gurus:
Could you help with this?
Does SAP use SQL server's snapshot and transactional replication?
Thanks!

Hi Christy,
no, SAP does not directly leverage these functions.
But none the less, it is up to you to use these on your system. I regulary use the snapshot functionality when applying Support Packages. In case somehing goes wrong a snapshot is the easiest way to roll back the import process (not exactly the best choice when talking about production and users keep on working while importing).
Have a look at this [document |http://download.microsoft.com/download/d/9/4/d948f981-926e-40fa-a026-5bfcf076d9b9/SAP_SQL2005_Best Practices.doc]. It deals with Best Practices and also covers snapshot, replication and mirroring.
Sven

Separating ASM home and DATABASE home?

I just installed a new 2 node cluster on linux Itanium and I have configured my CLUSTERWARE_HOME and DATABASE_HOME. We are using ASM for our database storage and I had used dbca to create the ASM instances and when I ran the dbca to create the new ASM instance I used the dbca from the DATABASE_HOME.
I have been told that I should have created an additional home for the ASM instance? Is this correct and is this a best practice for RAC and ASM?
Everything is up and running fine and I and pondering if it is worth reconfiguring so that we can have a separate ASM home?
Is there a good doc out there concerning how to reconfigure the home for ASM once it is up and runnig and my database is currently utilizing it for it's storage?
I know that I would just have to lay down the binariies into a new directory but what alse needs to change? Will this affect how the ASM instances are registered with the clusterware?
What is the real benefit of having them separate? I have been told that you can patch then separately but I don't see the benefit as the db would have to be down anyhow if the ASM instance would need to be patched?
Any suggestions are greatly appreciated.
Thanks.

Hi,
<< Oracle Documentation >>
Keep the following in mind when installing ASM:
When running more than one database instance on a single server or node, it is recommended that you install ASM in its own Oracle home on that server or node. This is advisable even if you are running only one database instance but plan to add one or more database instances to the server or node in the future.
With separate Oracle homes, you can upgrade and patch ASM and databases independently, and you can deinstall database software without impacting the ASM instance.
If an ASM instance does not already exist and you select the OUI option to install and configure ASM only, OUI installs ASM in its own Oracle home.
If you are running a single database instance on a server or node and have no plans to add one or more database instances to this server or node, ASM and the database can share a single Oracle home
If an ASM instance does not already exist and you select the OUI option to create a database that uses ASM for storage, OUI creates this single-home configuration.
Have a look at the following documents:
1) ML NOTE:265633.1 ASM Technical Best Practices
2) http://julian.dyke.users.btopenworld.com/com/Blog/2007_01_01_archive.html
3) http://www.dell.com/downloads/global/solutions/Oracle_DB_Deployment_with_Separate_ASM_and_Database_Home_Final_Web_Ready.pdf
4) http://download.oracle.com/docs/cd/B19306_01/server.102/b14231/storeman.htm#i1021337

How can validate the ASM size and free space correctly?

Dears ,,
I faced problem in ASM size as it appeared in alert file as below
ORA-19504: failed to create file "+DG_DATA"
ORA-17502: ksfdcre:4 Failed to create file +DG_DATA
ORA-15041: diskgroup space exhausted
So we resize ASM space and large it. But we faced the same problem also although there is free space in ASM.
It seems that the shown free space is not real.
How can validate the ASM size and free space correctly?
Thanks & Regards,,

*Oracle DBA* wrote:
Dears ,,
I faced problem in ASM size as it appeared in alert file as below
ORA-19504: failed to create file "+DG_DATA"
ORA-17502: ksfdcre:4 Failed to create file +DG_DATA
ORA-15041: diskgroup space exhausted
So we resize ASM space and large it. But we faced the same problem also although there is free space in ASM.
It seems that the shown free space is not real.
How can validate the ASM size and free space correctly?
Thanks & Regards,,
I was having this problem. Im my case i couldn add datafiles to a tablespace despite the fact that i was having a lot of space in the asm. Try rebalancing. It might help. In my case rebalancing also didn work because it seems that there need to be a threshold space in all the disks for the rebalancing to happen which was not in my case, so i had to shrink some unused space in the tablespace and then after gaining the required space I rebalanced the disk and then the disks got rebalanced, also i was able to use the free space that was showing .

Do we require two listeners. that is ASM listnener and DB listnener in oracle restart

Hi,
I have few question's on oracle restart.
1) Do we require two listeners. that is ASM listnener and DB listnener if yes why and if not what is the reason ?
2)If we add the components to OHASD,do we have to restart the services ?

Hi,
I don't get the point.
Listener don't hold connection but only redirect it to Instance, is the instance which create a session/process.
The use of listener is so small it's only for incoming connection, so after connection is established it is handled by Oracle Database process.
If you stop listener only incoming connection are affected, all current connection still alive on database.
1) ASM Connection is done only when someone try to connect at ASM remotely. It's pretty rare the use of it.
2) Does not matter if you are using ASM or DB Listener, ff you have a storm of connection incoming on its listener it should be avoided, in setting up the clients in a manner they don't open 100rds of connections at the same time - and with some listener.ora parameters.
Still see no reason to have two listener.

Cloning a ZFS rooted zone does a copy rather than snapshot and clone?

Solaris 10 05/08 and 10/08 on SPARC
When I clone an existing zone that is stored on a ZFS filesystem the system creates a copy rather than take a ZFS snapshot and clone as the documentation suggests;
Using ZFS to Clone Non-Global Zones and Other Enhancements
Solaris 10 6/06 Release: When the source zonepath and the target zonepath both reside on ZFS and are in the same pool,
zoneadm clone now automatically uses the ZFS clone feature to clone a zone. This enhancement means that zoneadm
clone will take a ZFS snapshot of the source zonepath and set up the target zonepathCurrently I have a ZFS root pool for the global zone, the boot environment is s10u6;
rpool 10.4G 56.5G 94K /rpool
rpool/ROOT 7.39G 56.5G 18K legacy
rpool/ROOT/s10u6 7.39G 56.5G 6.57G /
rpool/ROOT/s10u6/zones 844M 56.5G 27K /zones
rpool/ROOT/s10u6/zones/moetutil 844M 56.5G 844M /zones/moetutil
My first zone is called moetutil and is up and running. I create a new zone ready to clone the original one;
-bash-3.00# zonecfg -z newzone 'create; set autoboot=true; set zonepath=/zones/newzone; add net; set address=192.168.0.10; set physical=ce0; end; verify; commit; exit'
-bash-3.00# zoneadm list -vc
ID NAME STATUS PATH BRAND IP
0 global running / native shared
- moetutil installed /zones/moetutil native shared
- newzone configured /zones/newzone native shared
Now I clone it;
-bash-3.00# zoneadm -z newzone clone moetutil
Cloning zonepath /zones/moetutil...
I'm expecting to see;
-bash-3.00# zoneadm -z newzone clone moetutil
Cloning snapshot rpool/ROOT/s10u6/zones/moetutil@SUNWzone1
Instead of copying, a ZFS clone has been created for this zone.
What am I missing?
Thanks
Mark

Hi Mark,
Sorry, I don't have an answer but I'm seeing the exact same behavior - also with S10u6. Please let me know if you get an answer.
Thanks!
Dave

Is Snapshot and Materialised view are the same?

Can you please help me on this...
I am using oracle 10G enterprise edition...
Thanks in advance..

Re: Is Snapshot and Materialised view are the sameYes

ASM snapshots and ACFS

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