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Ciphers, if used, should be unbreakable for at least 12 months, and preferably for 24 months or more Encryption technology, if used, should be updated at least every 12 months, and preferably every six months Security for Commercial Transactions (Level 2): Some financial and business data demands protection even beyond the wire equivalent level Many companies and individuals refuse to transfer money by electronic means because they fear criminals will gain access to an account In a communications system with level 2 security, the encryption used in commercial transactions should be such that it would take a potential intruder (also called a hacker) at least 10 years, and preferably 20 years or more, to break the cipher The technology should be updated at least every 10 years, but preferably every 3 to 5 years Military Level Security (Level 3): Security to military specifications (also called mil spec) involves the most sophisticated encryption available Technologically advanced countries, and entities with economic power, have an advantage here However, as technology gains ever more (and arguably too much) power over human activities, aggressor nations and terrorists might injure powerful nations by seeking out, and striking at, the weak points in communications infrastructures In a communi-

The tempdb database is one of SQL Server s included system databases and is used as a shared temporary workspace for many different kinds of activities, such as the following: Storing user objects, such as temporary local and global tables and indexes, temporary stored procedures, table variables, and the cursor. Storing temporary work tables used for hash joins, aggregations, cursors, and spool operations, and temporarily storing large objects; storing intermediate sort results from many different internal operations, such as creating or rebuilding indexes, in addition to some GROUP BY, ORDER BY, and UNION queries. Storing objects used when using AFTER triggers and INSTEAD OF triggers. Storing large XML objects. Storing the SQL Server version store (SQL Server 2005/2008), which includes the common version store and the online-index-build version store (Enterprise Edition). Storing intermediate results and sorting activity used during DBCC CHECKDB operations. Storing temporary objects for Service Broker.

You may also want to create a trimming subroutine that removes tabs, linefeed characters, and carriage-return characters from strings To do so, create a list of the characters that you need to remove from the strings for example, {" ", tab, return, linefeed} and then check that the beginning and ending characters do not appear in the list

If your SQL Server instance is not busy, and it doesn t employ many of the activities described previously, then tempdb performance may not be a problem for you. On the other hand, if any of your SQL Server instances are busy, and are heavily involved in many, if not most, of the previously described activities, then you may find that tempdb can become a significant bottleneck for your entire SQL Server instance.

cations system with level 3 security, the encryption scheme should be such that engineers believe it would take a hacker at least 20 years, and preferably 40 years or more, to break the cipher The technology should be updated as often as economics allow

Unlike other SQL Server databases, the tempdb database is dropped and re-created every time the SQL Server service is stopped and restarted Here s what happens When the SQL Server service is started, by default, SQL Server makes a copy of the model database to create a new 8 MB tempdb database, inheriting customizations made to the model database In addition, a transaction log file of 1 MB is created For both the MDF and the LDF files, autogrowth is set to grow by 10 percent with unrestricted growth Each SQL Server instance may have only one tempdb database In addition, tempdb exhibits many behaviors that don t occur with other SQL Server databases For example, tempdb is configured to run using the simple recovery model, and this setting cannot be changed.

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In addition, many database options, such as Online, Read Write, Auto Close, Auto Shrink, and others are preset and cannot be modified The tempdb database has many other restrictions including the following: it can t be dropped; it can t be captured in a database snapshot; it can t participate in mirroring; and it can t allow DBCC CHECKDB to be run on it And as you would expect, neither the tempdb database nor its transaction log file can be backed up This makes sense, as tempdb is designed for temporary objects only, and is re-created each time SQL Server restarts After tempdb has been created, DBAs can create objects in it just as in other databases As user-created or internal objects are added to tempdb, it will automatically grow as necessary to whatever size is required to hold the objects.