Hi guys i was checking OQGRAPH limitations with query cache it can't use query cache cause we don't know when data base change, that's ok right? i think that's ok too some others engines have this 'problem' too the first answer is, since oqgraph can't know when data table changes, we can't cache oqgraph tables... i think that's right BUT... query cache 'save' table used in query cache, for example: select * from oq_graph this will include "select * from oq_graph" at query cache using table 'oq_graph' instead of only using 'oq_graph' we could include 'oq_graph' AND 'data_table' even when we 'only' use oq_graph at FROM part this is more interesting than turning query cache off to oq_graph, and this remove the problem of "the data table don't tell oqgraph when we need to invalidate query cache" and that's right! but since data_table changed it will invalidate all queries using it, including oq_graph queries =) check if i'm not wrong, i can try a patch with it if we don't have others query cache related problems (for example query cache don't support tables outside query) -- Roberto Spadim SPAEmpresarial Eng. Automação e Controle