I will answer this from personal experience, and not from any special idea of sleep mode. So take it with salt. Also a bit of a vague question, it seems, add comments where this fits. :)
, // , , . hibernate , SQL, , . , , , , .. ..
- , . , (10,0) (11,0), , , . , CHAR (1) BIT - , , . . , ALTER TABLE db, , , .
- , . Hibernate , .
, :
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- : , , , , . , - - , IP .
- : . Hibernate . , , , AFAICT.