What are the workprocess types in Database level?

[Former Member]

Hello,

I am recently faced one question,, what are the work process in DB level.How can we see

regards,

Balaram

[Former Member · Accepted solution]

Dear Balaram,

Just go to Tcode SM50(Process Overview) and click on type and then press F1.There you will get all the work process present.

SM50 work process: DIA responsible for interactive online processing. Work process for executing dialog steps in user transaction

UPD:Used for time critical updates that needs to happen immediately. Update process for executing update requests

ENQ : the single u2018central lock management serviceu2019 that controls the locking mechanism between the database and different application server.

SPO : Process for executing spool requests: Responsible for servicing print request.

BTC :Process for executing batch requests: Used for running Job in Background.

UP: BTC - Process for executing batch requests: Used for updates that are non critical, which are delayed until resources are available to process the updates

Message server: Responsible for communication between the different application server >an SAP instance has only 1 message server.

Gateway: Used for transporting bigger amount of data between application servers as well as external (non-SAP) systems those communicate with SAP

PS: You have 39 unresolved post out of the 42 you have.Please follow you posts

Regards,

Ashutosh

Edited by: ashutosh singh on Aug 11, 2008 8:48 AM

Edited by: ashutosh singh on Aug 11, 2008 9:09 AM

[Former Member]

Hi

Follow the rules.

Your question is answered by amit.

And u have not closed many of your questions.

Regards

Bhaskar

[Former Member]

Balaram, As far as my knowledge goes the work processes are existent only at the SAP level. Nevertheless you can see them at OS level through command DPMON. In the menu of this command you can go for option 'l' that will give you the replica of Tx SM50.

[Former Member]

Benefit of doubt

it seems he is interested in oracle background processes.

Database writer (DBWn)

The database writer writes modified blocks from the database buffer cache to the datafiles. Oracle Database allows a maximum of 20 database writer processes (DBW0-DBW9 and DBWa-DBWj). The DB_WRITER_PROCESSES initialization parameter specifies the number of DBWn processes. The database selects an appropriate default setting for this initialization parameter or adjusts a user-specified setting based on the number of CPUs and the number of processor groups.

Log writer (LGWR)

The log writer process writes redo log entries to disk. Redo log entries are generated in the redo log buffer of the system global area (SGA). LGWR writes the redo log entries sequentially into a redo log file. If the database has a multiplexed redo log, then LGWR writes the redo log entries to a group of redo log files.

Checkpoint (CKPT)

all modified database buffers in the system global area are written to the datafiles by DBWn. This event is called a checkpoint. The checkpoint process is responsible for signalling DBWn at checkpoints and updating all the datafiles and control files of the database to indicate the most recent checkpoint.

System monitor (SMON)

The system monitor performs recovery when a failed instance starts up again. In an Oracle Real Application Clusters database, the SMON process of one instance can perform instance recovery for other instances that have failed. SMON also cleans up temporary segments that are no longer in use and recovers dead transactions skipped during system failure and instance recovery because of file-read or offline errors. These transactions are eventually recovered by SMON when the tablespace or file is brought back online.

Process monitor (PMON)

The process monitor performs process recovery when a user process fails. PMON is responsible for cleaning up the cache and freeing resources that the process was using. PMON also checks on the dispatcher processes and server processes and restarts them if they have failed.

Archiver (ARCn)

One or more archiver processes copy the redo log files to archival storage when they are full or a log switch occurs.

Recoverer (RECO)

The recoverer process is used to resolve distributed transactions that are pending because of a network or system failure in a distributed database. At timed intervals, the local RECO attempts to connect to remote databases and automatically complete the commit or rollback of the local portion of any pending distributed transactions.

Dispatcher (Dnnn)

Dispatchers are optional background processes, present only when the shared server configuration is used.

Hope it help.

Amit

[Former Member]

Hi Amit,

Thanks verymuch.

regards,

Balaram

[Former Member]

Hello Amit,

Pls where we have to find ,,tell me the path.

regards,

Balaram

[former_member829550]

HI balram,

there is no concept called wp in DB.

this concept exsits only in sap ( as far as i know).

as said by vamshi , for every request to the DB from the sap wp a shadow work process is created for each and every request.

regards

bhupesh

[Former Member]

i am not sure of other datbase

but in oracle for every wrok process in SAP has shadow work process in DB

during startup work process connect to DB via these shadow work process using schma user SAP<SID>or SAPr3

Samrat

[Former Member]

Hi,

There is no concept of wp in the db level every db has its own process concept, SAP has the wp concept but not the db.

Regards,

Vamshi.