Answer Posted / mukesh singh, isource
There are many components within Exchange that require
access to Active Directory services, such as the
information store and the message categorizer. The DSAccess
component optimizes the communication between these
components and Active Directory.
The Exchange components that need to interact with Active
Directory use DSAccess to retrieve Active Directory
information rather than communicating directly with domain
controllers and global catalog servers. As a result,
DSAccess is therefore a very important part of Exchange.
DSAccess is good for system performance, since it maintains
a cache that effectively reduces the number of LDAP queries
that these Exchange server components make to Active
Directory. This is good for query speed as well as load
reduction on both domain controllers and global catalog
servers. Note, though, that Global Address List (GAL)
lookups from Outlook clients do not use this cache.
It’s the System Attendant service that initializes
DSAccess, which comes in the form of a Dynamic Link Library
(DLL) file DSACCESS.DLL. In addition to DSACCESS.DLL there
are two other associated DLLs, DSCMGS.DLL and DSCPERF.DLL.
DSCMGS.DLL contains the information DSAccess uses to write
event log entries, whilst DSCPERF.DLL contains performance
object information.
To see which processes are using DSACCESS.DLL, you can use
TASKLIST.EXE (Windows 2003 and Windows XP) or TLIST.EXE
(older versions of Windows) for from a command line by
running the following command on your Exchange server:
tasklist –m dsaccess.dll
You should see output similar to that shown in Figure 1,
where you can see that processes such as the Information
Store (store.exe) and the System Attendant (mad.exe) are
using DSACCESS.DLL.
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