media&instance-recovery

106.ff A tablespace, tbs_1, offline with the immediate option //offline (normal|temporary|immediate)
offline immediate將buffer中的數據不寫入就立即關閉。需要備份文件+archivelog+redolog
而instance recovery 不需要備份就可自動恢復的。redolog +undo。 SMON進程實現。

D. If the above operation were successful, media recovery would be required to bring the tablespace online.