OCP 12c 062題庫大更新，出現大量新題-5
The default undo tablespace is fixed size with:
-
RETENTION NOGUARANTEE
- undo_retention is 12 minutes
User scott get this error after a query on the sales table has run for more than 15 minutes:
ORA-01555: snapshot too old
Which three factors taken separately or in some combination might be the cause?
A) A committed delete to the sales table was made more than 12 minutes before the query began.
B) An uncommitted delete to the sales table was made more than 12 minutes before the query began.
C) A committed update to the sales table was made more than 12 minutes before the query began.
D) An uncommitted update to the sales table was made more than 12 minutes before the query began.
E) An update was made to the sales table before the query began.
F) An update to the SALES table was committed after the query began.
G) An update was made to the sales table after the query began.
Answer：ACF
(解析：題目的意思是：哪三個因素單獨或結合在一起可能是原因?快照太老是因為一個長時間運行的查詢語句，所要查詢的對象在 undo 段找不到而產生的，找不到的原因是事務已經提交了，原來使用的 undo 段被覆蓋。3組：1015267481 驗證ocp)
OCP 12c 062題庫大更新，出現大量新題-5