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SQL> SELECT x.ksppinm NAME, y.ksppstvl VALUE, x.ksppdesc describ
2 FROM SYS.x$ksppi x, SYS.x$ksppcv y
3 WHERE x.inst_id = USERENV ('Instance')
4 AND y.inst_id = USERENV ('Instance')
5 AND x.indx = y.indx
6 AND x.ksppinm LIKE '%&par%'
7 /
Enter value for par: blocks
old 6: AND x.ksppinm LIKE '%&par%'
new 6: AND x.ksppinm LIKE '%blocks%'

NAME VALUE DESCRIB
------------------------------ -------------------- -------------------------------------------
_log_blocks_during_backup TRUE log block images when changed during backup