signature based IDS/IPS effectiveness

focus-ids,

	How effective are signature based IDS/IPS systems on text based 
protocols which involves grammar like PL/SQL. Using PL/SQL I can write same 
query with different ways and different constructs that leads to different 
query patterns. So does not that mean stateless signature based IDS/IPS
are useless for database servers, etc.

Best Regards,
Mayur


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