Which three operations require undo data（） ["committing a transaction","flashing back a transaction","recovering a failed transaction","running a read-consistent query","changing a tablespace status from READ ONLY to READ WRITE"]
封堵是个作业中，为了防止中心钻在开孔过程中松动，应在中心钻上加装（） ["尼龙棒","螺栓","销钉","卡子"]
Which built-in would you use to test whether the CREATE TABLE command issued in the SALES form executed successfully?（） ["FORMS_DDL ","DO_SQL ","FORM_SUCCESS ","FORM_NOT_SUCCESS","DBMS.ERROR_CODE"]
简要叙述资产评估继续使用假设。
You discover that your Recycle Bin contains two tables with the same name， MY_TABLE. You also have a table named MY_TABLE in your schema. You execute the following statement： FLASHBACK TABLE my_table TO BEFORE DROP RENAME TO my_table2； What will be the result of executing this statement？（） [" One of the tables is recovered from the Recycle Bin using a First In First Out （FIFO） approach."," One of the tables is recovered from the Recycle Bin using a Last In First Out （LIFO） approach."," Both the tables are recovered from the Recycle Bin with one table renamed to MY_TABLE2 and the other to a system-generated name."," None of the tables are recovered from the Recycle Bin， and the statement returns an error."]
1977年11月（）的《班主任》发表，1978年“伤痕文学”形成文学潮流，一般被认为是“新时期”文学的开端。
