If one or a few processes have a high access rate to data on one track of a storage disk, then they may monopolize the device by repeated requests to that track. This generally happens with most common device scheduling algorithms (LIFO, SSTF, C-SCAN, etc). High-density multisurface disks are more likely to be affected by this than low density ones.
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The phase that identifies an efficient execution plan for evaluating a query that has the least estimated cost is referred to as query optimization.
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Tuesday, May 13, 2008
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Proactive Update:
The updates that are applied to database before it becomes effective in real world .
Retroactive Update:
The updates that are applied to database after it becomes effective in real world .
Simulatneous Update:
the updates that are applied to database at the same time when it becomes effective in real world .
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Tuesday, May 13, 2008
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The JDBC Optional Package for CDC/Foundation Profile (JDBCOP for CDC/FP) is an API that enables mobile Java applications to communicate with relational database servers using a subset of J2SE's Java Database Connectivity. This optional package is a strict subset of JDBC 3.0 that excludes some of JDBC's advanced and server-oriented features, such as pooled connections and array types. It's meant for use with the Foundation Profile or its supersets.
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Monday, May 12, 2008
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nl2br() inserts a HTML tag <br> before all new line characters \n in a string.
echo nl2br("god bless \n you");
output:
god bless<br>
you
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Sunday, May 11, 2008
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urlencode() returns the URL encoded version of the given string. URL coding converts special characters into % signs followed by two hex digits. For example: urlencode("10.00%") will return "10%2E00%25?. URL encoded strings are safe to be used as part of URLs.
urldecode() returns the URL decoded version of the given string.
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Saturday, May 10, 2008
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