ORA-04031: unable to allocate 312 bytes of shared memory ("shared pool","unknown object","CCursor","kglob")

Can anyone give me a pointer as to what this error means..what are CCursor and PCursor?.    

ORA-04031: unable to allocate 312 bytes of shared memory ("shared

pool","unknown object","CCursor","kglob")

ORA-00604: error occurred at recursive SQL level 1

ORA-04031: unable to allocate 312 bytes of shared memory ("shared

pool","unknown object","PCursor","kglob")  

John Dunn

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