关于startup的一些命令执行情形

关于startup的一些命令执行情形
>>startup nomount
1.Enabling and disabling redo log archiving<wbr> options<br> 2.Performing full database recovery<br><br><br> &gt;&gt;startup RESTRICT<br> 1.Perform an export or import of data<br> 2.Perform a data load (with SQL*Loader)<br> 3.Temporarily prevent typical users from using data<br> *4.Perform certain migration or upgrade operations<br><br> &lt;<wbr><wbr> Further, when the instance is in restricted mode, a database administrator<br> cannot access the instance remotely through an<wbr> Oracle Net listener, but can only access the instance locally from the machine that the instance is running on.<br><wbr><wbr> You can use the RESTRICT<wbr> clause in combination with the MOUNT,<wbr> NOMOUNT, and OPEN clauses.<br> Later, use the ALTER SYSTEM statement to disable the RESTRICTED SESSION <wbr><br> feature:<br><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr> sql&gt;ALTER SYSTEM DISABLE RESTRICTED SESSION;<br> If you open the database in nonrestricted mode and later find that you need to restrict access, you can use the ALTER SYSTEM statement to do so &gt;<br><br><br> &gt;&gt;startup force<br> 1.<wbr><wbr><wbr>You cannot shut down the current instance with the SHUTDOWN NORMAL,<br> SHUTDOWN IMMEDIATE , or<wbr> SHUTDOWN TRANSACTIONAL commands.<br> 2.<wbr><wbr><wbr>You experience problems wh en starting an instance.<br><br> （If an instance is running, STARTUP FORCE<wbr> shuts it down with mode<wbr> ABORT before restarting it.）<br><br><br> &gt;<br><br></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr>