单项选择题
A. An upper limit on how far you can flash back the database, depending on the information in the redo logs
B. An upper limit on how far you can flash back the database, depending on the information in the undo tablespace
C. The amount of time for which the flashback data is to be kept in the flash recovery area, provided that there is enough space
D. The amount of time for which the flashback data is guaranteed to be kept in the undo tablespace, provided that there is enough space
多项选择题 IdentifytheactivitiesperformedaspartoftheAutomaticSQLTuningprocessinthemaintenancewindow？（）
多项选择题 You issued the following command： CREATE GLOBAL TEMPORARY TABLE admin_work_area （startdate DATE， enddate DATE， class CHAR（20）） ON COMMIT DELETE ROWS TABLESPACE tbs_t1； An index is then created on the ADMIN_WORK_AREA temporary table. Which two statements are true regarding the TBS_T1 tablespace in the above command？（）
单项选择题 You are working in an online transaction processing (OLTP) environment. You use the FLASHBACKTABLE command to flash back the CUSTOMERS table. Before executing the FLASHBACK TABLE command, the system change number (SCN) was 663571. After flashing back the CUSTOMERS table, you realize that the table is not in the correct state. Now, you need to reverse the effects of the FLASHBACK TABLE command. Which is the fastest and the most efficient option to reverse the effects of the FLASHBACK TABLE command?（）