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分类: oracle
2019-09-10 09:28:12
your db_recovery_file_dest_size is 8g,currently,5g of the space is used of which 4g consists of obsolete backups, you execute this command;
sql> alter system set db_recovery_file_dest_size=2g;
what is the outcome?
a) it changes db_recovery_file_dest_size to 2g and deletes the obsolete backups
b) it changes db_recovery_file_dest_size to 5g
c) it fails because db_recovery_file_dest_size is a static parameter
d) it changes db_recovery_file_dest_size to 2g without deleting valid backups
e) it fails because the new size is less than 5g
answer: d (验证过)
cuug:因为当前还有空闲的空间 3g,所以无需删除有效和无效的备份。
赵:网友选 a 待验证。个人认为有效的备份只有 1g,小于被修改后的 2g,不需要删除过时的备份。
题译:db_recovery_file_dest_size 为 8g,目前使用的空间为 5g,其中 4g 由过时的备份组成。
小明:a 实测不会删除