Interview Questions.

Question 1. What Is Lotus Domino?

Answer :

An IBM server application platform used for business enterprise email, messaging, scheduling and collaboration. Lotus Domino become previously referred to as Lotus Notes Server and became initially the server component of Lotus Corp's consumer-server messaging era.

Question 2. How Can I Enable Daos Automatically For All New Mailfiles?

Answer :

To permit DAOS on all new mailfiles created at the server, adjust the mail85.Ntf (template) to have 'Use Domino Attachment and Object Service' enabled inside the advanced houses. When you select the mail85.Ntf, it will mechanically include settings. This setting will now not take effect till a database is at ODS fifty one. To create databases through default as ODS fifty one, enable the parameter 'Create_R85_Databases=1' within the server's notes.Ini document. (While you're enhancing the template, it's a very good idea to enable the 'Use LZ1 compression for attachments' property additionally to save even more space.) 

IBM Lotus Notes Interview Questions
Question three. Do I Need A Special Client Version To Use Daos?

Answer :

No. DAOS is a Domino server characteristic, and is obvious to the patron. Any consumer (older Notes variations, web, cellular, and so forth.) will be capable of read and write attachments to an NSF with DAOS enabled at the Domino server. In eight.5.1, a new characteristic become brought to the Notes customer that takes benefit of DAOS to put off transmitting attachment statistics that already exists inside the vacation spot DAOS server repository. Other customers will nevertheless work, but they cannot take benefit of this, and will always transmit the attachment records. 

Question four. I Have Clustered Servers, And They All Have Daos Enabled. Can I Share A Single Daos Repository Between Clustermates?

Answer :

No. Each server taking part in DAOS ought to have its very own separate DAOS storage route.

IBM Lotus Notes Tutorial
Question five. Is There One Nlo File Per Nsf, Or One Per Attachment, Or...?

Answer :

There is one NLO record created for each particular attachment many of the NSF documents taking part in DAOS on a unmarried server. Each NLO report includes the information for a unmarried specific attachment. If there are more than one attachments in an NSF, or maybe in a unmarried file, a separate NLO file will be created for every particular one.

IBM Informix Interview Questions
Question 6. If I Make The Minimum Participation Size Larger, Will Attachments Stored In Daos Be Moved Back Into The Nsf?

Answer :

Yes, but not routinely. Changing the minimal participation size within the DAOS tab of the server doc will affect the storage vicinity of any attachments written from that factor ahead. If you run a copy-fashion compact (compact -c somefile.Nsf) on an NSF that is already taking part in DAOS, attachments that are in DAOS but now not meet the minimum participation size may be stored inline inside the ensuing NSF. The reference remember for the NLO report might be decremented to mirror this. If the ensuing reference be counted reaches 0, the NLO file will become a candidate for deletion. 

Question 7. Why Does Daos Require Transaction Logging To Be Enabled?

Answer :

Storing attachments in DAOS involves coordinated moves for three extraordinary documents: the Notes database receiving the attachment, the DAOS record, and the daos catalog (index). Transaction logging is used to guarantee that we are able to put those dispensed pieces of the transaction lower back into a constant country after a server crash (T/L redo) or catastrophic failure (recover roll T/L forward). Transaction logging is a demand for DAOS and you surely can not use the characteristic without it. Overall, the usage of transaction logging will increase the consistency and integrity of all NSF data. 

The one location wherein T/L is elective with DAOS is mail boxes (e.G. MAIL.BOX). T/L mail bins is elective. There is a overall performance enhancement that permits optimized routing of messages with attachments to DAOS enabled mail files. 

Not allowing T/L on mailboxes does now not affect the disk area savings from the use of DAOS. It best disables a performance optimization.

IBM DB2 Tutorial IBM DB2 Interview Questions
Question eight. Why Am I Getting The Error "report Not Found" When Replicating A Daos Enabled Database?

Answer :

If an NLO report is lacking on one device and that report is replicated, the replicator will file this mistake. This will reason the replicator to hold to try to mirror this file on every replication. If this mistake is encountered 3 instances in a row the replicator will abort replicating the database. This can be averted with the aid of placing DEBUG_REPL_TOLERATE_ERRORS but does not clear up the trouble. 

There are two methods to clear up this trouble:

Restore the NLO record.

Run 'fixup -j -D' to delete the record referencing the lacking NLO.

Question nine. Why Do I Get Error When Compacting A Large Database Out Of Daos?

Answer :

If the ensuing database would exceed the 64GB NSF issue with the attachments in-covered within the NSF then you definitely cannot compact the database out of DAOS. 

DB2 Using SQL Interview Questions
Question 10. Why Don't I See The "use Domino Attachment And Object Service" Option Under File -> Application -> Properties?

Answer :

If you are not running a Notes eight.Five purchaser or later you will not see that choice. 

If the database is not ODS 51 or extra you will no longer see that option. Make sure CREATE_R85_DATABASES=1 is set in the notes.Ini and compact -c the database. Adding the '-DAOS on' flag will immediately allow DAOS earlier than the compact. 

DB2 Using SQL Tutorial
Question 11. Why Can't I Compact A Database Containing Tickets With Missing Attachments?

Answer :

This can show up due to the motives above. When you come across this trouble you may need to run 'fixup -j -D'. The -j switch is for transaction logged databases and the -D switch will motive documents with DAOS tickets pointing to invalid or missing NLO documents to be deleted. These documents are deleted with out a deletion stub so they may mirror again in. 

IBM Mainframe Interview Questions
Question 12. Why Are Some Daos Nlo Files Missing?

Answer :

One feasible purpose is the Anti-virus software observed an epidemic and 'quarantined' the document. This can appear while compacting a database into DAOS and an endemic is discovered on an attachment in the database. 

You should set your anti-virus settings to healthy you information listing. 

Also deleting NLO documents from the OS will motive problems with DAOS. 

IBM Lotus Notes Interview Questions
Question 13. How Do I Troubleshoot Non-daos Related Database Problems?

Answer :

A DAOS enabled database will characteristic generally as long as attachments aren't opened. So if you are troubleshooting a problem that isn't always DAOS associated you do not want to provide the NLO documents. 

IBM Mainframe Tutorial
Question 14. How Do I Troubleshoot Daos Related Database Problems?

Answer :

In order to troubleshoot a DAOS related trouble off line, or for support to diagnose the trouble, the database along with all NLO documents will need to be supplied. You can acquire a list of all NLO files referenced with the aid of a database by way of walking the command 'inform daosmgr listnlo ' 

Note that this is best necessary if the problem is with the attachment. Otherwise a resync of a database with missing attachments will result in 'Ghost' entries in the DAOS catalog, taking into account diagnosis of problems not associated with the attachments. 

 

Question 15. Why Can't I Open Attachments When I Open A Daos Enabled Database Locally?

Answer :

The DAOS references are handiest resolved via the Domino server. When you open the database regionally and you attempt to open a DAOS attachment you may get the mistake “The object save database is disabled. : Could not shop to file c:tmpnotesEA312Ddaosdb.Nsf” 

Active Directory Interview Questions
Question sixteen. Why Are Nlo Files Not Being Deleted?

Answer :

NLO documents are cleaned up (deleted) by means of the DAOS Prune method that is scheduled to run nightly at 2:00 AM. NLO documents are most effective removed while the DAOS catalog is in a 'Synchronized' country, the NLO refcount is 0, and the NLO was marked deleted longer than the prune interval ago. 

You also can run Prune from the console with the command 'inform daosmgr prune prune interval'. An c language of 0 will purpose all NLO files with a refcount of zero to be deleted right away. Use caution while right here as you could doubtlessly delete attachments that have in no way been backed up. 

Question 17. How Do I Determine Which Databases Are Daos Enabled?

Answer :

Run the command 'tell daosmgr dbsummary'. It will display the list of DAOS enabled databases, their price tag counts and their DAOS country. 

DB2 SQL Programming Interview Questions
Question 18. Why Are New Attachments Added To A Database Not Creating New Nlo Files?

Answer :

Verify that the database is DAOS enabled and the popularity is Read/Write. This is accomplished with the aid of getting into the command 'tell daosmgr dbsummary dbname' 

It is also feasible that the attachment does not meet the minimal DAOS length requirement. Remember that the size of the item is compared to the DAOS Minimum after it's miles compressed. 

The attachment already exists. Attachments are written to a temporary NLO report so that the MD5sum may be calculated. If that checksum suits an current NLO, the temporary document is deleted. In this situation the refcount for the object is incremented.

A trouble became encountered when growing an NLO document. In this case the fallback is to immediately create a widespread, inline NSF attachment. If something goes wrong along the manner (cannot create NLO document due to out of disk space, write blunders, permission, and many others.), the DAOS operation returns control to the ordinary NSF attachment coping with code. Worst case, it'll get in-lined in the database. 

IBM Informix Interview Questions
Question 19. How Do I Determine If Objects Are Going Into Daos?

Answer :

You can appearance within the DAOS directory to peer that NLO files are being created. Under the DAOS listing are subdirectories for the packing containers. Each subcontainer holds forty,000 NLO documents by default. 

Question 20. How Do I Determine When The Daos Catalog Needs Resync?

Answer :

When the DAOS catalog transitions to the country of "NEEDS RESYNC" a DDM event is fired so one can discover the database that first induced the catalog to enter this kingdom. This statistics may be determined inside the DDM database or in the log.Nsf. 

The following is a listing of operations that reason the DAOS catalog to transition to the state of "NEEDS RESYNC": 

replica a DAOS enabled database into the statistics directory from the OS
delete a DAOS enabled database from the OS
rename a database from the OS
delete an NLO from the OS (will transition to "NEEDS RESYNC" whilst the NLO is tried to be opened.)
restore a database immediately to the records directory
If you can not determine what action precipitated the catalog to "NEEDS RESYNC" and it maintains to occur, debug code have to be enabled. Setting 
DAOS_LOGGING=c:debugdaos.Txt STATE_CHANGE 
will log all DAOS kingdom exchange pastime. Also allowing DAOS_LOGGING will motive DAOS to output the decision stack to the server console that caused the catalog to transition to this state. That must take delivery of to aid at the side of the daos.Txt document to help troubleshoot the hassle. 
To clear the "NEEDS RESYNC" state run a resync with the aid of getting into the command 'inform daosmgr resync'. Note that at the same time as the catalog is on this state DAOS will maintain to function usually. However deletion of NLO files by means of the PRUNE assignment might be postponed till the catalog is inside the "SYNCHRONIZED" state again. 
IBM Integration Bus Interview Questions