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ID: 21632, Locking Schemes

by Gökmen ÇİFTÇİ Email:

Locking Schemes
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For InterBase, Version 4.0  to 4.0 210 downloads
Copyright: No significant restrictions

Size: 154,978 bytes
Updated on Thu, 15 Apr 2004 03:06:16 GMT
Originally uploaded on Thu, 15 Apr 2004 03:03:11 GMT
SHA1 Hash: 2A99DFEC1CE6B0AC28F3D2DADB810AD039F3F2D5
MD5 Hash: 8CFAF7BA8DC953DA744E7918A52761C7

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The oldest and most common method of controlling concurrent access to data by several users is locking. When one user locks an object in a database he or she restricts the ability of other users to access that object. How much a lock affects concurrency depends on the granularity of the lock. For example, a lock placed on an entire table will restrict other users access to all of the rows in the table. Therefore, a table level lock has very low granularity. A lock placed on a single page in a table limits access to all of the rows on that page. A page level lock is more granular than a table level lock. By contrast, a lock placed on a single row is very granular and provides the minimum restriction to concurrent data access.

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