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Jeroen W. Pluimers on .NET, C#, Delphi, databases, and personal interests

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Archive for the ‘DB2’ Category

Firebird and InterBase have single direction indexes for your data safety.

Posted by jpluimers on 2013/01/18

In most database index nodes are doubly linked to allow bi-directional scans., however not for InterBase and FireBird, there the reverse link isn’t used because it can be inconsistent due to write order of index pages.

The result is that in Firebird and InterBase, indexes are single-directional (either ascending or descending).

This is for your safety: it guarantees index consistency, even if because of EMP, your machine suddenly reboots after your tank fired a missile.


via Twitter / Avalanche1979: @SQLPerfTips For Firebird the ….

(Wow, did I really wrote 1200 blog posts?)

Posted in Database Development, DB2, Development, Firebird, InterBase, MySQL, OracleDB, PostgreSQL, SQL Server, SQL Server 2000, SQL Server 2005, SQL Server 2008, SQL Server 2008 R2, SQL Server 2012, SQL Server 7, Sybase | Leave a Comment »

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