You executed the following command to perform a backup of the USERS tablespace: SQL> ALTER TABLESPACE users BEGIN BACKUP; ALTER TABLESPACE users BEGIN BACKUP * ERROR at line 1: ORA-01123: cannot start online backup; media recovery not enabled What could be the reason for this error()
A. The MTTR Advisor is disabled.
B. The database is in NOARCHIVELOG mode.
C. The tablespace is already in backup mode.
D. The Flash Recovery Area is not configured.
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下列几种滤网中,精度最高的滤网是()
A. 40目滤网
B. 60目滤网
C. 80目滤网
D. 100目滤网
4月份,某机构投资者预计在6月份将购买面值总和为800万元的某5年期A国债,假设该债券是最便宜可交割债券,相对于5年期国债期货合约,该国债的转换因子为1.25,当时该国债价格为每百元面值118.50元。为锁住成本,防止到6月份国债价格上涨,该投资者在国债期货市场上进行买人套期保值。假设套期保值比率等于转换因子,要对冲800万元面值的现券则须()。
A. 买进10手国债期货
B. 卖出10手国债期货
C. 买进125手国债期货
D. 卖出125手国债期货