code to generate barcode in vb.net Microsoft SQL Server 2005 Memory Configuration in Visual C#.NET

Generation UPC - 13 in Visual C#.NET Microsoft SQL Server 2005 Memory Configuration

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Microsoft SQL Server 2005 Memory Configuration
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Checkpoint Process
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A checkpoint is a SQL Server operation that synchronizes the physical data with the current state of the buffer cache by writing out all modified data pages in buffer cache to disk. It does not put the pages back on the free list as the lazy writer does. The checkpoint also forces any pending transaction log records in the log buffer to be written to the log file on disk. This assures a permanent copy of the data on disk at the point in time when the checkpoint process completes. SQL Server has a thread dedicated to checkpoints. Performing checkpoints also reduces the necessary recovery time in the event of a system failure in cases where automatic recovery by SQL Server is possible. This is because by writing data out to disk, checkpoints minimize the number of transactions that must be rolled forward (transactions that completed but are not written to disk yet). The time needed to recover the database is determined by the time since the last fully completed checkpoint and the number of dirty pages in the buffer cache. So decreasing the checkpoint interval the amount of time between checkpoints (discussed in the next section) reduces the recovery time, but with some cost. The checkpoint process incurs some overhead because it may perform a large number of writes, depending on the number of modified pages that must be written to disk. These writes could potentially interfere with and slow the user transaction response times. This is typically not a problem but potentially could be in systems that experience heavy data modifications. The checkpoint operation involves a number of steps, including the following:
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Writing out all dirty data to disk A dirty page is one that has been modified in the buffer cache or log cache, but has not yet been written to disk. Writing a list of outstanding, active transactions to the transaction log This step
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notifies SQL Server of which transactions were in progress when the checkpoint occurred, so that in the case of an automatic recovery, SQL Server knows to go back further in the log than the checkpoint in order to recover those transactions.
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Storing checkpoint records in the log A record marking the start and the end of each checkpoint is written to the log.
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Checkpoints occur per database, so, for example, if you are connected to SQL Server using the master database and manually run the checkpoint command, the checkpoint operation runs only on the master database. However, when SQL Server performs automatic checkpoints, a checkpoint is run on all databases. Checkpoints occur in the following cases:
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Whenever you issue a manual CHECKPOINT command, a checkpoint operation is executed against the current database in use.
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Part IV
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Microsoft SQL Server 2005 Architecture and Features
Whenever you shut down SQL Server, a checkpoint operation is executed on all databases. Using the SHUTDOWN WITH NOWAIT command skips the checkpoint. This may cause the subsequent restart to take much longer to recover the databases and is not recommended. When the ALTER DATABASE command is used to add or remove a database file, a checkpoint occurs. When a minimally logged operation such as a bulk-copy is performed and the database is in bulk-logged recovery model, a checkpoint occurs. When a change going from the bulk-logged or full recovery models to the simple recovery model is made, a checkpoint occurs. Before a database backup is performed, a checkpoint is executed on that database. By design, for databases using the full or bulk-logged recovery models, checkpoints are periodically run on all databases as specified by the recovery interval server setting (recovery interval is discussed in a later section). With simple recovery model, checkpoints are run automatically either when the log becomes 70 percent full or based on the recovery interval setting as above, whichever comes first in this case. For simple recovery model, the log is truncated after checkpoints occur.
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