单项选择题
A. One block change tracking file is created for each data file. By default， the file is created in DB_CREATE_FILE_DEST.
B. One block change tracking file is created for each data file. By default， the file is created in BACKGROUND_DUMP_DEST.
C. One block change tracking file is created for the database. By default， the file is created in DB_CREATE_FILE_DEST.
D. One block change tracking file is created for the database. By default， the file is created in BACKGROUND_DUMP_DEST.
单项选择题 You execute the following command to enable a session in resumable mode： SQL> ALTER SESSION ENABLE RESUMABLE TIMEOUT 60； What is the impact of a timeout on the statements being suspended？（）
单项选择题 Inyourtestdatabase，youfindthatauser’ssessionisexecutingalotofSQLstatements，resultinginthegenerationofalargenumberoftracefiles.Whileinvestigatingthereason，youfindthatSQLtracehasbeenenabledattheinstancelevel.YouwanttodisableSQLtrace，remotely，onlyforthatusersessiontoreducethevolumeoftracedatabeinggenerated.Howdoyouachievethisobjective？（）
多项选择题 You are working on an Oracle Database 10g database. Because of data loss， you decided to perform a Flashback Database operation using the following command： SQL> FLASHBACK DATABASE TO TIMESTAMP（SYSDATE ？5/24）； Which two statements are true？ （）