How Oracle compute the cardinality if no stats

Hi
9.2.0.6
very simple query
SELECT *
FROM TRFPRDTXT.F559215A
WHERE (QALOTN = :KEY1)
| Id | Operation | Name | Rows | Bytes | Cost |
| 0 | SELECT STATEMENT | | 2 | 392 | 2 |
| 1 | TABLE ACCESS BY INDEX ROWID| F559215A | 2 | 392 | 2 |
|* 2 | INDEX RANGE SCAN | F559215A_4 | 2 | | 1 |
Predicate Information (identified by operation id):
2 - access("F559215A"."QALOTN"=:Z)
optimizer_mode = choose
no stats on table/index
the question:
why cardinallity is 2 ?
Thanks for your help

There are two possibilities (as far as I know):
* dynamic sampling was introduced with 9.2, so the system could gather the statistics on the fly: http://blogs.oracle.com/optimizer/entry/dynamic_sampling_and_its_impact_on_the_optimizer
* if dynamic sampling is not active (I don't know the default in 9.2) then the cbo has to use some default values: http://download.oracle.com/docs/cd/B10500_01/server.920/a96533/stats.htm#25064
The index costing will follow the formula that Wolfgang Breitling first made public in 2002 (and which is discussed in detail in Jonathan Lewis' Cost Based Oracle, Chap. 4, S. 62 ff.):
cost = blevel + ceiling(leaf_blocks * effective index selectivity) + ceiling(clustering factor * effective table selectivity)Regards
Martin Preiss

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source (ID 32538 Details: Internal error code: 0x809909FE)
Recommended action: Review the failure errors for individual files from the log file
\\?\Volume{8492c150-f195-11de-a186-001cc4ef89a0}\B1E9D373-2C03-464E-A472-99BC93DB1E2A\FailedFilesLog.txt and take appropriate action. If some files fail consistently, you can exclude the folders containing these files by modifying the protection group or
moving the files to another location.
So, how do you actually open the FailedFilesLog.txt file shown in this DPM alert? What is this path referring to? Well, this is the mount point for the protected server's replica volume on the DPM server, which is mounted under \Program
Files\Microsoft DPM\DPM\Volumes\Replica\servername\File System. Here you'll see the mount points for all of the server's protected volumes. However, if you try to open one of these mounted volumes
in Windows Explorer, you'll get Access Denied, even if you have administrator rights. (If someone knows of a way around this, please let me know). As a workaround, you can access this mounted volume in an elevated
command prompt. Steps:
Open an Administrator Command Prompt
Type mountvol <AnyAvailableDriveLetter>: \\?\Volume{VolumeGUID}
Example: mountvol m: \\?\Volume{8492c150-f195-11de-a186-001cc4ef89a0} Note that we're only using the first part of the path to the FailedFilesLog.txt
file given in the DPM alert, starting from \\? and ending after the
} character.
Next, type m: to change to the newly mounted m: drive.
Then type cd B1E9D373-2C03-464E-A472-99BC93DB1E2A This is actually a folder name so we're just going into this folder.
Finally type dir and you should see the FailedFilesLog.txt file. This file can be copied to another location where it's easier to use (i.e. in Windows Explorer).
Be sure to unmount this volume when you're done by typing mountvol m: /d in the command prompt. (Mountvol reference:
http://technet.microsoft.com/en-us/library/cc772586(WS.10).aspx.)
What a pain, eh? But at least by reviewing the FailedFilesLog.txt file you can determine which files or folders caused the sync to fail and thus take action accordingly.
Now, here's my question: Where is that registry key that lets me adjust the limit of 100 files that DPM allows to be skipped before it fails the replica? Hopefully someone out there will tell me. I know this can be done because Kapil Malhotra
said so in this post:
http://groups.google.com/group/microsoft.public.dataprotectionmanager/browse_thread/thread/a179fa30fb50c9b0/e9a348f2a9386063?lnk=raot.
Also, does anyone know what the internal error code 0x809909FE means in this alert? Knowing this my help us determine what caused these files to fail. Interestingly, in the FailedFilesLog.txt file, it gave a different error code next to each failed file:
0x80070002.
-Taylorbox

Thanks for responding, Fahd. So, just to be sure...
Do I add this registry key to the DPM server or to the protected servers (or both)?
In either case, the ContinueOnFailure key does not currently exist. So, I must create this key and the MaxFailedFiles DWORD value
manually, right?
Does the server in which I create this regkey have to be restarted for it to take affect?
Can the DPM alert for the 0x809909FE error event (for exceeding the limit of 100 failures) please be adjusted to provide a path to the FailedFilesLog.txt file
that actually works if you click on it?
Any ideas on why the 0x80070002 "File not found" error happened? The files on the server were simply created and then deleted. Why would such file activity lead to this error?
Thanks,
-Taylorbox

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