WebDAV Query generates a high number of transaction log files

Hi all,
I have a program that launch WebDAV queries to search for contacts on an Exchange 2007 server. The number of contacts returned for each user's mailbox is quite high (about 4500).
I've noticed that each time the query is launched, about 15 transaction log files are generated on the Exchange server (each of them 1Mb). If I ask only for 2 properties on the contacts, this number is reduced to about 8.
This is a problem since our program is supposed to launch often (about every 3/5min) as It will synchronize Exchange mailboxes with a SQL Server DB. The result is that the logs increase very quickly on the server side, even if there are not so many updates.
Any idea why so many transaction logs are generated when doing a WebDAV search returning many items? I would understand that logs are created when an update is done on the server, but here it's only a search with many contacts items returned.
Is there maybe a setting on the Exchange server to control what kind of logs to generate?
Thank for your help,
Alexandre

Hi Alex,
Actually circular logging/backup was not a solution, I was just explaining that there is an option like that on server but it is not recommended hence not useful in our case :)
- I am not a developer but AFAIK, WebDAV search query shouldn't generate transaction log because it just searches the mailboxes and gives the result in HTTP format and doesn't produce any Exchange transaction.
- I wouldn't open transaction logs since it is being used by Exchange which may generate errors and may corrupt Exchange database sometime too. However it is not readable, as you observed, other than Exchange Information Store service (store.exe).
- You can post this query in development forum to get better idea on this, if any other programmer observed similar symptom while using WebDAV contact search query in Exchange 2007 or can validate your query.
Microsoft TechNet > Forums Home > Exchange Server > Development
Well, I just saw that you are using Exchange 2007, in that case why don't you use Exchange Web Service which is better and improved method to access/query mailboxes where as WebDAV is also de-emphasized in Exchange 2007 and might be disappeared in next version of Exchange. Checkout below article for further detail.
Development: Overview
http://technet.microsoft.com/en-us/library/aa997614.aspx
Amit Tank | MVP - Exchange | MCITP:EMA MCSA:M | http://ExchangeShare.WordPress.com

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Query to retrieve the number of transactions done in every 1 hour for last

Hi,
Could anyone help in writing a query to retrieve the number of transactions done in every 1 hour for last month.
Case:
I/P
Cases Timestamp1
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case2 01-01-2008 00:01:01
case3 01-01-2008 01:00:01
case1 01-01-2008 01:02:01
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from time to_time cases
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We can do this using analytical functions
Following is what I did:
create table timestamp1 (ts date)
select *from timestamp1
30/10/2008 15:41:13
30/10/2008 15:41:05
30/10/2008 15:40:03
30/10/2008 14:58:26
30/10/2008 14:29:45
30/10/2008 13:17:48
30/10/2008 08:29:50
30/10/2008 06:05:51
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30/10/2008 02:29:54
select distinct to_char(ts,'hh24') frmhrs,
to_char(ts,'hh24')+1 tohrs, count(ts) OVER (order by to_number(to_char(ts,'hh24')) RANGE (1/24) PRECEDING )
from timestamp1
where trunc(ts)=trunc(sysdate) -- I added this just to make sure I get for today's data
order by frmhrs
FRMHRS     TOHRS     CNT
02     3     1
03     4     1
06     7     1
08     9     1
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Very high transaction log file growth

Hello
Running Exchange 2010 sp2 in a two node DAG configuration. Just recently i have noticed a very high transaction log file growth for one database. The transaction logs are growing so quickly that i have had to turn on circular logging in order to prevent
the log lun from filling up and causing the database to dismount. I have tried several things to try find out what is causing this issue. At first i thought this could be happening because of virus, an Active Sync user, a users outlook client, or our salesforce
integration, howerver when i used exmon, i could not see any unusual high user activity, also when i looked at the itemcount for all mailboxes in the particular database that is experiencing the high transaction log file growth, i could not see any mailboxes
with unusual high item count, below is the command i ran to determine this, i ran this command sever times. I also looked at the message tracking log files, and again could see no indication of a message loop or unusual high message traffic for a
particlar day. I also followed this guide hopping that it would allow me to see inside the transaction log files, but it didnt produce anything that would help me understand the cause of this issue. When i ran the below tool againts the transaction log files,
i saw DDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDD, or OOOOOOOOOOOOOOOOOOOOOOOOOOOOOOO, or HHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHH.
I am starting to run out of ideas on how to figure out what is causing the log file build up. Any help is greatly appreciated.
http://blogs.msdn.com/b/scottos/archive/2007/07/12/rough-and-tough-guide-to-identifying-patterns-in-ese-transaction-log-files.aspx
Get-Mailbox -database databasethatkeepsgrowing | Get-MailboxStatistics | Sort-Object ItemCount -descending |Select-Object DisplayName,ItemCount,@{name="MailboxSize";exp={$_.totalitemsize}} -first 10 | Convertto-Html | out-File c:\temp\report.htm
Bulls on Parade

If you have users with iPhones or Smart Phones using ActiveSync then one of the quickest ways to see if this is the issue is to have users shot those phones off to see if the problem is resolved. If it is one or more iPhones then perhaps look at
what IOS they are on and get them to update to the latest version or adjust the ActiveSync connection timeout. NOTE: There was an issue where iPhones caused runaway transactions logs and I believe it was resolved with IOS 4.0.1
There was also a problem with the MS CRM client awhile back so if you are using that check out this link.
http://social.microsoft.com/Forums/en/crm/thread/6fba6c7f-c514-4e4e-8a2d-7e754b647014
I would also deploy some tracking methods to see if you can hone in on the culprits, i.e. If you want to see if the problem is coming from an internal Device/Machine you can use one of the following
MS USER MONITOR:
http://www.microsoft.com/downloads/en/details.aspx?FamilyId=9A49C22E-E0C7-4B7C-ACEF-729D48AF7BC9&displaylang=en and here is a link on how to use it
http://www.msexchange.org/tutorials/Microsoft-Exchange-Server-User-Monitor.html
And this is a great article as well
http://blogs.msdn.com/b/scottos/archive/2007/07/12/rough-and-tough-guide-to-identifying-patterns-in-ese-transaction-log-files.aspx
Also check out ExMon since you can use it to confirm which mailbox is unusually active , and then take the appropriate action.
http://www.microsoft.com/downloads/en/details.aspx?FamilyId=9A49C22E-E0C7-4B7C-ACEF-729D48AF7BC9&displaylang=en
Troy Werelius
www.Lucid8.com
Search, Recover, & Extract Mailboxes, Folders, & Email Items from Offline EDB's and Live Exchange Servers with Lucid8's DigiScope

Transactional log file issue

Dear All,
There have been issues in the past where the transactional log file has grown too big that it made the drive to limit its size. I would like to know the answers to the following
please:
1. To resolve the space issue, is the correct way to first take a backup of the transactional log then shrink the transactional log file?
2. What would be the recommended auto growth size, for example if I have a DB which is 1060 GB?
3. At the moment, the transactional log backup is done every 1 hour, but I'm not sure if it should be taken more regularly?
4. How often should the update stat job should run please?
Thank you in advance!

Hi
My answers might be very similar to geeks already answer, but hope it will add something more
1. To resolve the space issue, is the correct way to first take a backup of the transactional log then shrink the transactional log file?
--> If database recovery model is full \ bulk then tlog backup is helpful, and it doesnt help try to increase frequency of log backup and you can refer :
Factors That Can Delay Log Truncation
2. What would be the recommended auto growth size, for example if I have a DB which is 1060 GB?
Auto grow for very large db is very crucial if its too high can cause active vlf and too less can cause fragmentation. In your case your priority is to control space utilizatiuon.
i suggest you to keep minimum autogrowth and it must be in size not in percentage.
/*******Auto grow formula for log file**********/
Auto grow less than 64MB = 4 VLFs
Autogrow of 64MB and less than 1GB = 8 VLFs
Autogrow of 1GB and larger = 16 VLFs
3. At the moment, the transactional log backup is done every 1 hour, but I'm not sure if it should be taken more regularly?
---> If below query returns log_backup for respective database then yes you can to increase log backup frequency. But if it returns some other factor , please check above
mention link
"select name as [database] ,log_reuse_wait , log_reuse_wait_desc from sys.databases"
4. How often should the update stat job should run please?
this totaly depend on ammount of dml operation you are performing. you can select auto update stats and weekly you can do update stats with full scan.
Thanks Saurabh Sinha
http://saurabhsinhainblogs.blogspot.in/
Please click the Mark as answer button and vote as helpful
if this reply solves your problem

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What is stored in a transaction log file?

What does the transaction log file store? Is it the blocks of transactions to be executed, is it the snapshot of records before beginning the
execution of a transaction or is it just the statements found in a transaction block? Please advice.
mayooran99

yes, it will store all the values before and after that were modified. you,first, have to understand the need for transaction log, then, it will start to become apparent, what is stored in the transaction log
before the transaction can be committed, sql server will make sure that all the information is hardened on the transaction log,so if a crash happens, it can still recover\restore the data.
when you update some data - the data is feteched into memory and updated- transaction log makes note of it(before and after values etc).see, at this point, the changes were done but not physically present in the data page, they present only in the memory.
so, if crash happens(before a check piont\lazy writer could be issued), you will that data...this where transaction log comes handy, because all this information is stored in physical file of transaction log. so, when your server comes back on, if the transaction
is committed, the transaction log will roll forward this iinformation
when a checkpoint\lazy writer happens, in simple recovery, the transaction log for that txn is cleared out, if there are no other older active txns.
in full recovery you will take log backups, to clear that txn from the transaction log.
in transaction log data generally is faster because 1. it is written sequentialyl...it will track the data pageno, lsn and other details that were modified and makes a note of it.
similar to data cache, there is also transaction log cache, that makes this process faster.. all transactions before being committed, it will wait to make sure everything related to the txn is written to the transaction log on disk.
i advice you to pick up - kalen delaney, sql internals book and read - recovery an logging chapter..for more and better understanding...
Hope it Helps!!

Big transaction log file

Hi,
I found a sql server database with a transaction log file of 65 GB.
The database is configured with the recovery model option = full.
Also, I noticed than since the database exist, they only took database backup.
No transaction log backup were executed.
Now, the "65 GB transaction log file" use more than 70% of the disk space.
Which scenario do you recommend?
1- Backup the database, backup the transaction log to a new disk, shrink the transaction log file, schedule transaction log backup each hour.
2- Backup the database, put the recovery model option= simple, shrink the transaction log file, Backup the database.
Does the " 65 GB file shrink" operation would have impact on my database users ?
The sql server version is 2008 sp2 (10.0.4000)
regards
D

I've read the other posts and I'm at the position of: It really doesn't matter.
You've not needed point in time restore abilities inclusive of this date and time since inception. Since a full database backup contains all of the log needed to bring the database into a consistent state, doing a full backup and then log backup is redundant
and just taking up space.
For the fastest option I would personally do the following:
1. Take a full database backup
2. Set the database recovery model to Simple
3. Manually issue two checkpoints for good measure or check to make sure the current VLF(active) is near the beginning of the log file
4. Shrink the log using the truncate option to lop off the end of the log
5. Manually re-size the log based on usage needed
6. Set the recovery model to full
7. Take a differential database backup to bridge the log gap
The total time that will take is really just the full database backup and the expanding of the log file. The shrink should be close to instantaneous since you're just truncating the end and the differential backup should be fairly quick as well. If you don't
need the full recovery model, leave it in simple and reset the log size (through multiple grows if needed) and take a new full backup for safe keeping.
Sean Gallardy | Blog |
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Job number from alert log file to information

Hello!
I have a question about job numbers in alert log file. Today one of our Oracle 10g R2 [10.2.0.4] RAC nodes crashed. After examining alert log file for one of the nodes I saw a lot of messages like:
Tue Jul 26 11:52:43 2011
Errors in file /u01/app/oracle/admin/zeme/bdump/zeme2_j002_28952.trc:
ORA-12012: error on auto execute of job *20627358*
ORA-12705: Cannot access NLS data files or invalid environment specified
Tue Jul 26 11:52:43 2011
Errors in file /u01/app/oracle/admin/zeme/bdump/zeme2_j001_11018.trc:
ORA-12012: error on auto execute of job *20627357*
ORA-12705: Cannot access NLS data files or invalid environment specified
Tue Jul 26 11:52:43 2011
Errors in file /u01/app/oracle/admin/zeme/bdump/zeme2_j000_9684.trc:
ORA-12012: error on auto execute of job *20627342*
ORA-12705: Cannot access NLS data files or invalid environment specified
After examining trc files I have found no further information about error except session ids.
My question is: how to find what job caused these messages to appear in alert log file.
How do I map number in alert log file to some "real" information (owner, statement executed, schedule)?
Marx.

Sorry for the delay
Try this to find the job :
select job, what from dba_jobs ;
How do I find NLS_LANG version?SQL> show parameter NLS_LANG
Do you mean ALTER SESSION inside a job?I meant anywhere, but your question is better.
ORA-12705 - Common Reasons and How to Resolve Them [ID 158654.1]
If OS is Windows lookout for NLS_LANG=NA in the registry
Is it possible you are doing this somewhere ?
ALTER SESSION SET NLS_DATE_FORMAT = 'RRRR-MM-DD\"T\"HH24:MI:SS';NLS database settings are superseded by NLS instance settings
SELECT * from NLS_SESSION_PARAMETERS;
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NLS_LANG=_AMERICA.WE8ISO8859P1 ( correct )
NLS_LANG=AMERICA.WE8ISO8859P1 ( Incorrect )
you need to set the "_" as separator.
Windows
set NLS_LANG=AMERICAN_AMERICA.WE8ISO8859P1
Unix
export NLS_LANG=AMERICAN_AMERICA.WE8ISO8859P1
mseberg
Edited by: mseberg on Jul 28, 2011 3:51 PM
Edited by: mseberg on Jul 29, 2011 4:05 AM

Shrink Transaction log file - - - SAP BPC NW

HI friends,
We want to shrink the transaction log files in SAP BPC NW 7.0, how can we achieve thsi
Please can you throw some light on this
why we thought of ghrinking the file ?
we are getting "out of memory " error when ever we do any activity. so we thought of shrinking the file (this is not a production server - FYI)
example of an activity where the out of memeory issueee appears
SAP BPC excel >>> etools >>> client options >>> refresh dimension members >>> this leads to a pop-up screen stating that "out of memory"
so we thought of shrinking the file.
Please any suggestions
Thank you and Kindest Regards
Srikaanth

HI Poonam,
Not only the excel is throwing this kind of message (out of memory) - the SAP note is helpful, if we have error in excel alone
But we are facing this error every where
We have also found out that our Hard disk capacity as run out of space.
we want to empty the log files and make some space for us.
our hard disk is now having only few MegaBytes now
we want to clear our all test data, log files, and other stuffs
Please can you recommed us some way
Thank you and Kindest regards
Srikaanth

Delete transaction log file

Hi,
I have three T-log files in my database, Now I want to delete 2 Transaction log files.
Can I do the below action:
1. dbcc shrinkfile(log1,truncateonly)
2 dbcc shrinkfile(log2,truncateonly)
2. Then remove the file using command or SSMS.
Regards

Hi Satheesh,
What about this:
Can I use the below procedure:
dbcc shrinkfile(LOG2,emptyfile)
dbcc shrinkfile (LOG3,emptyfile)
alter database PRT remove file LOG2
alter database PRT remove file LOG3
Note: I have already LOG1 as my primary logfile existing there, I want to remove only secondary logfiles
Regards

Transaction Log File Drive is missing from SAN

HI all,, we had some SAN issues and we dont have Transaction Log files for some databases..
This is SQL Server 2008 R2 Cluster.. The drive which was holding this Tlog files were missing.. PLease let me know, how to bring back databases.. Awaiting for early reply..

As others have said, the SAN folks needs to get their act together and bring back disk with the log files.
If the log files are truly lost, you should restore a clean backup. If you don't have a clean backup, well, there are some people in your company that are likely to ask you some questions of what is going on the data centre.
It was suggested that you should detach the data file and reattach it to have a new log file created. I strongly recommend against this. You will get a database that is likely to have corruption and inconsistency on both SQL Server level and application,
due to transactions that were in flight when the log files were lost.
Erland Sommarskog, SQL Server MVP, [email protected]

Ce7305-5.3.3: number of transaction log archives

Could anybody tell me how many archives are kept for transaction logs on a ce7305-5.3.3, and how can we control the number of them?
Thanks in advance.
A.T Doan

Hi Alex,
Actually circular logging/backup was not a solution, I was just explaining that there is an option like that on server but it is not recommended hence not useful in our case :)
- I am not a developer but AFAIK, WebDAV search query shouldn't generate transaction log because it just searches the mailboxes and gives the result in HTTP format and doesn't produce any Exchange transaction.
- I wouldn't open transaction logs since it is being used by Exchange which may generate errors and may corrupt Exchange database sometime too. However it is not readable, as you observed, other than Exchange Information Store service (store.exe).
- You can post this query in development forum to get better idea on this, if any other programmer observed similar symptom while using WebDAV contact search query in Exchange 2007 or can validate your query.
Microsoft TechNet > Forums Home > Exchange Server > Development
Well, I just saw that you are using Exchange 2007, in that case why don't you use Exchange Web Service which is better and improved method to access/query mailboxes where as WebDAV is also de-emphasized in Exchange 2007 and might be disappeared in next version of Exchange. Checkout below article for further detail.
Development: Overview
http://technet.microsoft.com/en-us/library/aa997614.aspx
Amit Tank | MVP - Exchange | MCITP:EMA MCSA:M | http://ExchangeShare.WordPress.com

Cancel the query which uses full transaction log file

Hi,
We have reindexing job to run every week sunday. During the last run, the transaction log got full and the subsequent transactions to the database got errorred out stating 'Transaction log is full'. I want to restrict the utilization of the log file, that
is, when the reindexing job reaches the utilization of the log file to a certain threshold automatically the job should get cancelled. Is there any way to get it.

Hi,
We have reindexing job to run every week sunday. During the last run, the transaction log got full and the subsequent transactions to the database got errorred out stating 'Transaction log is full'. I want to restrict the utilization of the log file, that
is, when the reindexing job reaches the utilization of the log file to a certain threshold automatically the job should get cancelled. Is there any way to get it.
Hello,
Instead of Putting limit on trn log it would be good to find out cause causing high utilization.Even if you find that your log is growing because of some transaction it would be a blunder to rollback its little easy to do it for Index rebuild but if you
cancel for some delete operation you would end up in mess.Please don't create a program to delete or kill running operation.
You can create custom job for alert for trn log file growth.That would be good.
From 2008 onwards Index rebuild is fully logged so sometimes it causes trn log issue.To solve this either you run index rebuild for specific tables or for selective tables.
Other option is widely accepted Ola Hallengren script for index rebuild.I suggest you try this
http://ola.hallengren.com/
Please mark this reply as the answer or vote as helpful, as appropriate, to make it useful for other readers

Corrupted message causing a huge number of transaction logs

Hello All
We have a SBS 2011 client and one user is having an issue with a single message being unable to synchronize with the server.
This message attempts to get synchronized with the server every minute but fails and gets listed on the Sync issues folder as per the below listed message.
8:19:57 Error synchronizing message 'Palm Beach - Updated Lease Plan'
8:19:57
[8004010B-501-480-324]
8:19:57
The client operation failed.
8:19:57
Microsoft Exchange Information Store
8:19:57
For more information on this failure, click the URL below:
8:19:57
http://www.microsoft.com/support/prodredirect/outlook2000_us.asp?err=8004010b-501-480-324
8:19:57 Moved a message that failed synchronization to 'Local Failures'. Message subject -> 'Palm Beach - Updated Lease Plan'. You can view this message in your offline folder file only.
There were over 2 GB of the same message on the local failure folder so I have deleted all of those messages and currently there is no similar message on the local failure folder but the sync issues folder still reports a sync failure.
Because of this reason transaction logs getting generated in massive numbers so I had to enable circular logging to make sure disk space is not fully consumed by transaction logs.
I have search everywhere on this user’s mailbox but is unable to locate this message in question. Also this is not on the message queue on the exchange server as well.
How can I locate this message and remove it?
Thanks,
Dhanushka

Hi Dhanushka,
Sorry for my interrupting.
Would you please let me confirm whether the sync issue persists when user log on OWA?
Please refer to the following similar thread and check if can help you.
Synchronize
error for Outlook 2007
Error
synchronizing message
Regarding to 10030 and 10031, please refer to the following KB.
The Microsoft Exchange Information Store service crashes
occasionally when a folder view is corrupted on an Exchange Server 2010 mailbox server
If anything I misunderstand, please don’t hesitate to let me know. Meanwhile, please provide the complete event
message.
Hope this helps.
Best regards,
Justin Gu

Log Reader Agent: transaction log file scan and failure to construct a replicated command

I encountered the following error message related to Log Reader job generated as part of transactional replication setup on publisher. As a result of this error, none of the transactions propagated from publisher to any of its subscribers.
Error Message
2008-02-12 13:06:57.765 Status: 4, code: 22043, text: 'The Log Reader Agent is scanning the transaction log for commands to be replicated. Approximately 24500000 log records have been scanned in pass # 1, 68847 of which were marked for replication, elapsed time 66018 (ms).'.
2008-02-12 13:06:57.843 Status: 0, code: 20011, text: 'The process could not execute 'sp_replcmds' on ServerName.'.
2008-02-12 13:06:57.843 Status: 0, code: 18805, text: 'The Log Reader Agent failed to construct a replicated command from log sequence number (LSN) {00065e22:0002e3d0:0006}. Back up the publication database and contact Customer Support Services.'.
2008-02-12 13:06:57.843 Status: 0, code: 22037, text: 'The process could not execute 'sp_replcmds' on 'ServerName'.'.
Replication agent job kept trying after specified intervals and kept failing with that message.
Investigation
I could clearly see there were transactions waiting to be delilvered to subscribers from the followings:
SELECT * FROM dbo.MSrepl_transactions -- 1162
SELECT * FROM dbo.MSrepl_commands -- 821922
The following steps were taken to further investigate the problem. They further confirmed how transactions were in queue waiting to be delivered to distribution database
-- Returns the commands for transactions marked for replication
EXEC sp_replcmds
-- Returns a result set of all the transactions in the publication database transaction log that are marked for replication but have not been marked as distributed.
EXEC sp_repltrans
-- Returns the commands for transactions marked for replication in readable format
EXEC sp_replshowcmds
Resolution
Taking a backup as suggested in message wouldn't resolve the issue. None of the commands retrieved from sp_browserreplcmds with mentioned LSN in message had no syntactic problems either.
exec sp_browsereplcmds @xact_seqno_start = '0x00065e220002e3d00006'
In a desperate attempt to resolve the problem, I decided to drop all subscriptions. To my surprise Log Reader kept failing with same error again. I thought having no subscription for publications log reader agent would have no reason to scan publisher's transaction log. But obviously I was wrong. Even adding new log reader using sp_addLogreader_agent after deleting the old one would not be any help. Restart of server couldn't do much good either.
EXEC sp_addlogreader_agent
@job_login = 'LoginName',
@job_password = 'Password',
@publisher_security_mode = 1;
When nothing else worked for me, I decided to give it a try to the following procedures reserved for troubleshooting replication
--Updates the record that identifies the last distributed transaction of the server
EXEC sp_repldone @xactid = NULL, @xact_segno = NULL, @numtrans = 0, @time = 0, @reset = 1
-- Flushes the article cache
EXEC sp_replflush
Bingo !
Log reader agent managed to start successfully this time. I wish if I could have used both commands before I decided to drop subscriptions. It would have saved me considerable effort and time spent re-doing subscriptions.
Question
Even though I managed to resolve the error and have replication funtioning again but I think there might have been some better solution and I would appreciate if you could provide me some feedback and propose your approach to resolve the problem.

Hi Hilary,
Will the below truncate the log file marked for replication, is there any data loss, when we execute this command, can you please help me understand, the internal working of this command.
EXEC sp_repldone @xactid = NULL, @xact_segno = NULL, @numtrans = 0, @time = 0, @reset = 1

WebDAV Query generates a high number of transaction log files

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