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27 Cards in this Set

  • Front
  • Back
Does Exchange 5.5 support OWA?
What is the maximum size of the message store on 5.5?
limited only by storage space
What three methods does 5.5 support for encrypted email?
X.509 certificates, S/MIME, and SSL
What are the three components of the Exchange database architecture?
information store, database engine, and OS disk I/O
What is the information store responsible for?
storing data
What two databases comprise the information store?
the private information store database (priv.edb) and the public information store database (pub.edb)
What size are the pages used by Exchange Server?
4 Kb
What is the Exchange term for a page in memory that has been written with data?
How does Exchange handle dirty pages?
it periodically writes them to the information store
What drawback does Exchange's data caching scheme present?
the information on disk is never up-to-date while Exchange is running
What Exchange component is responsible for securing a copy of all of the dirty pages?
the transaction log files
What does Exchange do if other services need memory in use by Exchange?
it flushes pages to disk and reduces buffer size
What is a transaction?
a set of changes to a database which obeys ACID
What does ACID stand for?
Atomic, Consistent, Isolated, Durable
What does the A in ACID stand for?
Atomic: either all operations occur or none occur
What does the C in ACID stand for?
Consistent: the database is transformed from one correct state to another
What does the I in ACID stand for?
Isolated: changes are not visible until committed
What does the D in ACID stand for?
Durable: committed transactions are preserved in database even if system crashes
Why is it best to keep transaction logs on a dedicated disk?
so disk failures that corrupt the database won't affect the transaction logs
How much data can each log file contain?
5 Mb
What happens when a log file is full?
a new log file is created (unless circular logging is turned on)
What does Exchange do to keep track of log files?
it associates each log file with a generation number
What does Exchange use to track data that hasn't been written to the database file?
a checkpoint file (edb.chk)
What does the checkpoint file do?
indicates where in the log file a recovery should start from
Where is the checkpoint file located?
on the system disk
How does circular logging handle logging?
once a log's size limit is reached, it is deleted and a new log is created
Why is circular logging a bad idea?
it negates the ability to recover in the case of a hardware failure