DB error SQL error 1105 occurred

Dears,

I have working on SAP ERP 6 EHP5 NW 7.02 on Sybase, and get the following error" DB error: SQL error 1105 occurred "also when try to open TCode: dbacockpit to extend the table space, the SAP GUI terminated and show the following error also <SID>: SAP System Message: Work process restated; session terminated.

so please advice how I can solve this issue, thanks in advance.