[单选] Metro Mirror pairs are set up between volumes in LSSs, usually in separate locations anddifferent disk subsystems. These logical paths are defined over physical links between the disksubsystems. What is the maximum number of logical paths per physical link?（）

据史书记载，我国古代人口从汉代以来大体在五六千万左右，清康熙末年只有二三千万，乾隆五十九年（1794年）激增至三亿多，道光十四年（1834年）超过四亿，导致人口激增的直接原因是（）。 清朝管辖区域扩大。 农耕面积大量增加。 地丁银制度的推行。 生产力的显著提高。 Another DBA issues a shutdown abort command on a database on which you were running an online backup. What will happen when you try to restart the database？（）    Oracle will automatically take the datafile out of hot backup mode，generate a warning message，and then open the database.。  Oracle will automatically take the datafile out of hot backup mode and then open the database.。  Oracle will generate an error when trying to open the database，indicating that a datafile is in hot backup mode.You will need to correct this error before you can open the database.。  The database will open with the file in hot backup mode. You can restart the backup at any time.。  The datafile in hot backup mode will be corrupted and you will have to recover it.。 An RMAN backup job fails， displaying the following error message：  ORA­19809： limit exceeded for recovery files  Your analysis shows that the Flash Recovery area is full. What would you do to resolve the error？（） increase the value of UNDO_RETENTION。 change the value of WORKAREA_SIZE_POLICY to AUTO。 increase the value of DB_RECOVERY_FILE_DEST_SIZE。 increase the value of CONTROL_FILE_RECORD_KEEP_TIME。 You have enabled resumable space allocation in your database by setting the RESUMABLE_TIMEOUT parameter set to a nonzero value.Which three statements about resumable space allocation are true? （） Even with resumable space allocation enabled for your database, you can disable resumable space allocation for a single session.。 A resumable statement is suspended only if an out of space error occurs. （Out of space condition Maximum extents reached condition，Space quota exceeded condition）。 When a resumable statement is suspended, the transaction that contains the statement is also suspended.。 A resumable statement can only be suspended and resumed once during the execution of the statement.。 You can query the V$SESSION_WAIT dynamic performance view to identify the statements that are suspended for a session.。 按GB7588-2003《电梯制造与安装安全规范》规定，轿门地坎与层门地坎之间水平距离不得大于（）。 0.120m。 0.350m。 0.035m。 0.030m。 Metro Mirror pairs are set up between volumes in LSSs, usually in separate locations anddifferent disk subsystems. These logical paths are defined over physical links between the disksubsystems. What is the maximum number of logical paths per physical link?（）