oracle8i(8.1.5)数据复制的问题，求救！！

jnzsh

用的oracle复制 快照表的方式，内存的占用不断提高，到50%以上后，提示下面的错误
Error at line 1:
ORA-04030: out of  process memory when trying to allocate 65036 byte (callheap,KQL,ternbuf)
ORA-06508: PL/SQL : could not find program unit being called
ORA-06512:at “sys.DBMS_SNAPSHOT”,line 578
ORA-04030: out of process memory when trying to allocate 52356 byte(pgeheap,ksm,stack)
ORA-04030: out of process memory when trying to allocate 65036 byte(callheap,KQL,ternbuf)
ORA-06508: PL/SQL : could not find program unit being called
ORA-06512:at “sys.DBMS_SNAPSHOT”,line 863
ORA-04030: out of  process memory when trying to allocate 65036 byte (koh durheap d,kol vstring)
ORA-01632: Max # extents(20) reached in index ops$CYXT.DBDSNAP$_DFD_HZ_NO_PK
ORA-06512:preceding line from XHSD
ORA-06512: at “sys.DBMS_SNAPSHOT”,line644
OIRA-06512:at “sys.DBMS_2REFRESH” line 561
ORA-06512:at “sys.BDMS_REFRESH” line 207
ORA-06512: at line 1