Update in continually refreshed workspace

Hi,
From experiment I can see that when row is updated in child continually refreshed workspace it stops receiving updates made in parent workspace (which makes sense). What should happen to for that row to start receiving updates again? I tried refresh and merge and it doesn't seem to work.
Thanks,
Artem.

Hi Artem,
As long as a row exists in the child workspace, no automatic updates will be done to that particular row. So, the only way to reinstate this is to remove it. So, without recreating the workspace, this can be done by using MergeTable with the remove_data parameter set to true, or by executing RollbackWorkspace, RollbackTable, or RollbackToSP to remove all of the changes done to the row in the child workspace.
Regards,
Ben

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Is it possible to "freeze" a continually refreshed workspace?

Hello,
I'm developing a project management system based on workspaces.
The aim is to create and develop projects inside the workspaces, parallel to the stream LIVE, and after approvall, do the merge.
I have two requirements:
Req1 - Workspaces should be continually refreshed, during their "livetime".
Req2 - After the merge, it is necessary to save the final information in the workspace, just for future read.
I thought the following approach:
Use workspaces in CR mode and after merge, switch to NCR. The scenario would be stable and unchanging, maintaining the necessary historical data.
I found out that it's not possible to change a CR workspace to a NCR.
Besides, the raising of workspaces (tried with 30000), cause general database degradation. Queries on version-enabled and merge/refresh operations were getting slower and slower.
Three questions about this:
1 - Is there any way to "freeze" CR workspaces? Like... avoid the auto-refresh process?
2 - Is it natural that queries and merge / refresh operations become successively slower with increasing workspaces? (i noticed that many wmsys.wm$ tables/views are used in these processes and it seems to me that their performance is getting worse. Is that possible? If so, is there any way to optimize?)
3 - Assuming that the use of thousands of workspaces may have some performance issues, what is the best way to save a final (total and unchangeable) "image" of the database after doing the merge of a project?
NOTE:
I thought using a system with just one CR workspace (history WS) and savepoints... just to keep the final views of the projects.
After merging to LIVE, the history workspace would be auto-refreshed, I would put a savepoint there and keep the final vision. But with a CR workspace, the savepoint doesn't work in the way i need... the vision is altered every time we change rows in LIVE, right?
So, i tried to use a NCR workspace. After merge operation, i force a refresh in the history workspace, put the savepoint and it's done. But there's still a little problem with this scenario: LIVE may have hundreds or thousands of changes to refresh... the process can be slow and block the LIVE records for a long time.
Am i jumping to conclusions or assuming something wrong? Is there any technical solution that I'm not seeing?
Any help or ideas are welcome!
Thanks in advance.
Best regards,
Pedro Lourenço

Hi,
To answer your questions:
1. There is a way to freeze a workspace, using dbms_wm.FreezeWorkspace, but it would only prevent dmls / workspace operations from taking place within the child workspace. It would not remove the auto-refresh functionality of the workspace.
2. No, you should not being having a significant performance impact on queries by just adding workspace. Have the statistics of the WMSYS schema been gathered, and for the schemas that contain the version enabled tables? If not, I would recommend doing so. If you have done so already, I would need to see specific queries, etc.
3. If you need to get a snapshot of the data without the possibility of it being changed, you can't use a CR workspace, so your only option would be a NCR one. How much of the data that is being modified by a child workspace is being additionally modified by other children workspaces? Essentially, does each workspace work with its own distinct data or would there be alot of overlap(ie conflicts) between them? How many of these workspaces need to be merged and/or refreshed simultaneously?
Have you thought about creating a savepoint in the LIVE workspace at the time of the merge and use that as the snapshot? It would not work in all use cases, so would depend on the specifics of your setup. I'll continue thinking if there are existing ways to accomplish this.
Also, in regards to CR workspace savepoints, the savepoint data can be changed if the child workspace doesn't have its own version of the row. Any new row in LIVE would override the view of the data from each savepoint.
Regards,
Ben

Automatically refreshed workspace and changes into LIVE

Hi,
I've noticed that changes made directly into LIVE
are immediately visible to automatically refreshed
child workspaces. However the answer to the FAQ
question "When sharing changes made in a child
workspace with another child workspace, should I
use periodic (manual) or continually (automatic)
refresh?", states that this type of change must
be refreshed manually.
What is the expected behaviour afterall?
Regards,
Karina Borges

Karina,
For continually refreshed workspaces, changes made in the LIVE workspace will be immediately visible.
For non-continually refreshed (NCR) workspaces, the changes are not immediately visible - to see the changes, NCR workspaces have to be manually refreshed.
We will update the FAQ to make this point clearer.
regards,
- Ramesh.

Workspace continually refreshed, Savepoints & MergeWorkspace scenario

Hi,
I'm using Oracle WorkspaceManager from oracle version: Oracle Database 10g Enterprise Edition Release 10.2.0.4.0 - 64bit
1./ I create a workspace with the isRefreshed flag set to true.
2./ I immediately create a savepoint A.
3./ I insert a row in a versioned table.
4./ Create savepoint B.
4./ exec dbms_wm.setdiffversions('workspace', 'A', 'workspace', 'B')
5./ Querying the diff view should show me 3 rows.
DiffBase and workspace, A rows would have wmDiffCode: NE (Not existing)
workspace, B row would have wmDiffCode: I (insert)
All is fine so far.
5./ I merge the workspace to LIVE
6./ I query the diff view again:
DiffBase and workspace, A rows would have wmDiffCode: NC (Not changed)
workspace, B row would have wmDiffCode: I (insert)
I confirm that step 6./ shows wmDiffCode: NE if I disable continual refresh.
Can somebody tell me why the wmDiffCode changes to NC in this scenario? I thought that creating a savepoint was saving a snapshot of the workspace (including DIFF view states) that should not be alterable by any refresh operations on the workspace, it seems like this assertion is false.
Any insights appreciated,
Thanks,
-Guillaume Jeudy

Hi,
This is expected. The NE code indicates that the row does not currently exist as of that version/savepoint. However, when the row is merged into the LIVE workspace, and due to the fact that the child workspace is being continually refreshed, this new row will become visable from savepoint A. Any changes into the LIVE will automatically refresh any child workspaces(including earlier savepoints) up to the point where each row is further modified. Since the row is now visible from savepoint A, the code needs to changed from NE to NC.
When the workspace is not being continually refreshed, the merge into the LIVE workspace does not cause any changes to savepoint A, and so the row remains not existent.
Regards,
Ben

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