排球击球手型：（），（）、（）。击球点：（）。击球部位：（）的两小臂桡骨内侧所构成的平面击球的位置。
You work as a database administrator for Supportcenter.cn. You added atablespaceto your database. Because of the changes to the physical structure of your database， you performed a backup of the control file to trace. After this， you lost only the control files and the instance aborted due to a hardware failure. How would you proceed to recover the database？（） Start the instance and open the database， instance recovery automatically recoverscontrol files。 Create a file based on the contents of the trace file and save it to the control file locations and start the database。 Re-create the database （The recovery of the control file is not possible because you have lost all the control files.）。 Start the instance， in the NOMOUNTstate，re-create the control file using the CREATE CONTROLFILE command stored in the trace file.。 Start the instance and MOUNT the database， then re-create the control file using the CREATE CONTROLFILE command stored in the trace file.。
提高教师的教学能力与水平应该从以下四方面出发（）。
Data deduplication ratios depend on many factors. However， deduplication ratios are generallygreater for what type of data？（） encrypted data。 compressed data。 archive data。 multiplexed data stream。
You work as a database administrator for Supportcenter.cn. You received the following error while working on your database： ORA-01555： snapshot too old ，In which situation would you receive such an error？（） You performed rollback after commit.。 If a log switch occurs in your database.。 Thearchiverfails to generate an archived log file.。 Instance recovery fails to find one of the redo log files.。 A long-running query is unable to get read-consistent image.。 If you perform manual undo management operations in auto mode.。
创业者打算购买一家现存企业之前，必须对其进行全面的审查，主要包括（）。
