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The Query Governor Cost Limit Option
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The Query Governor Cost Limit option dynamically controls whether queries that the query optimizer estimates will take longer than the configured value will execute. The default value of zero turns off the query governor. Configuring this option allows you to prevent run-away queries or expensive queries (such as Cartesian products), from executing and potentially having a detrimental impact on your SQL Server instance s performance. Be careful when configuring this option because SQL Server 2005 s query optimizer compares its estimate of how many seconds it has predicted the query will take to execute, although the actual execution time taken might be less.
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The Recovery Internal Option
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The Recovery Interval option dynamically controls how often the checkpoint process runs. This is probably one of the least-understood configuration options. The recovery interval value does not indicate how frequently the checkpoint process should run; it indicates the worst-time scenario in minutes for recovering a database. In other words, the frequency of how often the checkpoint process runs is based not on a time-based value but on an estimate made by SQL Server of how long it will take to write all data modifications that have occurred to the database since the last checkpiont. The default value of zero does not indicate that the checkpoint process runs every minute, as is commonly thought; it indicates that SQL Server checks every minute to see whether it should issue a checkpoint depending on a number of factors, including how many data modifications have occurred and how long it will take SQL Server to write them back to disk, how busy the SQL Server instance is at that moment, and what percentage of the transaction log is full. In practice, this typically translates to recovery time of less than a minute and a checkpoint that runs every minute for active databases. The Recovery Interval option is typically left alone and considered a fine-tuning mechanism. You should consider changing the Recovery Interval option only if you
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have determined that your SQL Server database solution s performance is being degraded by checkpoint.
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The Set Working Set Size option has no effect in SQL Server 2005 and has been included for backward compatibility only.
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Tuning the Database Layout
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In 10, Creating Databases and Database Snapshots, we examined creating databases in detail. We also also looked at disk I/O subsytems and the various levels of RAID in 4 and 7. There are a number of techniques that you can use to optimize performance at the database level.
Database Layout
Perhaps one of the easieist techniques that a DBA can employ to tune his or her databases is to take advantage of the file and filegroup architecture supported by SQL Server databases. Don t forget that you can change your file and filegroup strategies once a database has been created. Note
Don t forget to put your transaction log onto a separate spindle for your OLTP databases to separate your sequential transaction log I/O from your random database I/O.
Files
You can improve performance in a mulitprocessor server environment by using multiple data files in your database. By using multiple secondary data files, you can take advantage of SQL Server s multithreaded architecture because it will use one thread per database file to perform concurrent I/O operations. There is no point, from a performance point of view, in creating more files than the number of processors available on the server, taking into account any affinity settings, because SQL Server allocates only enough threads, up to the number of processors for the I/O operations. So how large should database data files be One tip I commonly suggest is limiting database file to the capacity of current CD/DVD technology. For example, if you limit your primary database file and secondary database file to 4.7 GB you can easily burn them onto DVDs for offsite backup purposes or for shipping databases to a remote site for attaching. With larger databases, you could obviously take advantage of new technology such as DVD+/-DL, Blue-Ray and HD-DVD.
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