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