c# qr code with logo The Exchange 2010 Store in C#

Making QR Code ISO/IEC18004 in C# The Exchange 2010 Store

7 The Exchange 2010 Store
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Maintaining contiguity
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7 ESE function Cleanup Compaction Checksum Microsoft has taken enormous care to allocate contiguous space within Store databases. However, this is not the end of the story, because pages have a lifetime that begins with their creation and extends through modifications and deletes. Given that Microsoft s maximum recommended database size for Exchange 2010 is now counted in terabytes, it s obvious that the old way of maintaining contiguity through scheduled background maintenance would not work. Table 7-3 lists the major changes that Exchange 2010 makes to ensure that contiguity is maintained inside databases no matter how large they become.
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Table 7-3 Changes in background database maintenance operations
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Exchange 2007 SP1 (and later) Deleted items and mailboxes are removed from the database after their retention time expires during online background maintenance. Pages freed by deleted items and mailboxes are recycled during online background maintenance.
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Exchange 2010 Deleted items and mailboxes are removed from the database immediately their retention period expires. Deleted pages are zeroized by default. Pages freed by deleted items are recycled immediately. This activity is autothrottled to prevent interference with database responsiveness.
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Contiguity/ Defragmentation
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The recycling of deleted pages does not ESE analyzes the database for contigutake contiguity into account and recyity and free space at run time to ensure cled pages are used randomly. that contiguity is maintained as defragmentation occurs. This activity is also auto-throttled. When configured, the checksums in The default is to run checksum validadatabase pages are verified during back- tion continuously in the background on ground maintenance. both active and passive database copies to detect potential corruptions immediately. Administrators can opt to run this check during scheduled background maintenance instead.
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Essentially, the Store checks each transaction to ensure that maximum contiguity is maintained and that it is using available space efficiently. If necessary, a background thread is created to address any problems perhaps it will shuffle some pages so that they are more contiguous or to free up space in the database. All of this work is throttled automatically so that background operations never interfere with the ability of the Store to service user requests, just like Windows Desktop Search only indexes items on a PC s hard disk when the PC is inactive.
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Dealing with I/O
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As you read the discussion about contiguity and about the larger 32 KB page size used by Exchange 2010, the thought might run through your mind that larger pages arrayed in bigger chunks might increase the overall on-disk size of a database. This conclusion is correct, but it is offset by the introduction of data compression within the database. Microsoft believes that the potential extra growth in database size is fully mitigated by the way that they compress message headers and HTML and text body parts. Their tests show that a database might grow 20 percent compared to its Exchange 2007 equivalent without compression but that it remains the same size once data are compressed. Of course, the exact ratio of compression will vary depending on the mix of content within a database (Rich Text Format [RTF], text, HTML, different types of attachments). For example, RTF messages are already compressed and are therefore not compressed again when they are written into a database. Outlook 2010 generates HTML format messages by default, so databases that support these clients get more value from compression than databases that support earlier clients such as Outlook 2003, where the default message format is likely to be RTF. Exchange 2010 SP1 achieves more efficiency by first clustering records and tags into contiguous chunks within a page before attempting to compress the data.
INSIDE OUT
Data compression doesn t include attachments
Although great value is attained by compressing message bodies, Exchange doesn t attempt to compress attachments . Tests by the Exchange development team demonstrate that most attachment types that circulate with messages, such as newer versions of Word documents and Excel worksheets, don t compress well because they are already stored in a compressed format . The same is true of other attachment types that you might not want to see circulated via email including JPEG, PNG, MP3, and WMA . Some older formats such as Word 2003 do compress well, but as these versions are being rapidly replaced their attachments will form a decreasing percentage of the overall attachment volume . The decision was therefore made to avoid incurring the CPU overhead of compression to achieve what might be a marginal decrease in overall storage requirement, especially at a time when storage costs are declining rapidly . The same logic was used when the decision was made not to attempt to compress RTF message bodies .
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