An Introduction to the Progress Database - Radius
An Introduction to the Progress Database - Radius
An Introduction to the Progress Database - Radius
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<strong>Database</strong> Transaction Logs<br />
• <strong>Progress</strong> generates two types of transaction<br />
logs:<br />
• The undo-redo log or Before-Image Log contains<br />
a record of recent changes.<br />
• The redo log or After-Image Journal contains a<br />
record of all changes since a complete backup of<br />
<strong>the</strong> database was made.<br />
• The records (also called “notes”) that are written<br />
<strong>to</strong> <strong>the</strong> two transaction logs are identical.<br />
• O<strong>the</strong>r database systems use similar<br />
techniques<br />
11<br />
© 2007 <strong>Progress</strong> Software Corporation
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