If you cannot start the Oracle database,you do not have valid backups to restore,lost system tablespace data files,data files corrupted !Is there a way to recover your data !   Yes,Still you have an option to extract your data using an Oracle tool Data Unloading (DUL). https://www.askmaclean.com/archives/oracle-dul-data-unloader-data-recovery-tool-information-summary.html   DUL is an offline operation.DUL is the processof extracting (unloading) data from Oracle data files directly.Its an offline tool and it bypasses the Oracle Kernel.There are similarother tools availble in the market e.g DUDE / jDUL, PRM-DUL,

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ORACLE PRM-DUL Download: http://zcdn.parnassusdata.com/DUL5108.zip   AnySQL UnLoader (AUL),Oracle Salvage, Oracle Recovery , WisdomForce FastReader for Oracle,MyDUL,CLOUT,K2Tor Pro,FlashUnload