387.Which method could be utilized to identify both DML operations and the SQL statements needed to
undo those operations for a specific schema owner? (Choose all that apply.)
A. Query DBA_TRANSACTION_QUERY for TABLE_NAME, OPERATION, and UNDO_SQL. Limit rows
by START_SCN and TABLE_OWNER.
B. Query FLASHBACK_TRANSACTION_QUERY for TABLE_NAME, OPERATION, and UNDO_SQL.
Limit rows by START_SCN and TABLE_OWNER.
C. Query FLASHBACK_TRANSACTION_QUERY for TABLE_NAME, OPERATION, and UNDO_SQL.
Limit rows by START_TIMESTAMP and TABLE_OWNER.
D. Query DBA_TRANSACTION_QUERY for TABLE_NAME, OPERATION, and UNDO_SQL. Limit rows
by START_SCN and TABLE_OWNER.
Answer: BC
答案解析：
START_SCN和START_TIMESTAMP都是指一个时间点。
FLASHBACK_TRANSACTION_QUERY
FLASHBACK_TRANSACTION_QUERY displays information about all flashback transaction queries in the database. The database must have at least minimal supplemental logging enabled to avoid unpredictable behavior.
| Column | Datatype | NULL | Description |
|---|---|---|---|
XID |
RAW(8) |
Transaction identifier | |
START_SCN |
NUMBER |
Transaction start system change number (SCN) | |
START_TIMESTAMP |
DATE |
Transaction start timestamp | |
COMMIT_SCN |
NUMBER |
Transaction commit system change number; NULL for active transactions | |
COMMIT_TIMESTAMP |
DATE |
Transaction commit timestamp; NULL for active transactions | |
LOGON_USER |
VARCHAR2(30) |
Logon user for the transaction | |
UNDO_CHANGE# |
NUMBER |
Undo system change number (1 or higher) |
|
OPERATION |
VARCHAR2(32) |
Forward-going DML operation performed by the transaction:
|
|
TABLE_NAME |
VARCHAR2(256) |
Name of the table to which the DML applies | |
TABLE_OWNER |
VARCHAR2(32) |
Owner of the table to which the DML applies | |
ROW_ID |
VARCHAR2(19) |
Rowid of the row that was modified by the DML | |
UNDO_SQL |
VARCHAR2(4000) |
SQL to undo the DML indicated by OPERATION |