OCP-1Z0-052-V8.02-1題
阿新 • • 發佈：2018-11-04
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1. View the Exhibit and examine the attributes of an undo tablespace.
In an OLTP system, the user SCOTT has started a query on a large table in the peak transactional hour
that performs bulk inserts. The query runs for more than 15 minutes and then SCOTT receives the
following error:
ORA-01555: snapshot too old
What could be the reason for this error?
A.The query is unable to get a read-consistent image.
B.There is not enough space in Flash Recovery Area.
C.There is not enough free space in the flashback archive.
D.The query is unable to place data blocks in undo tablespace
Answer: A 答案解析： 參考：管理還原資料： http://blog.csdn.net/rlhua/article/details/12259555 “快照太舊”錯誤是因為沒有足夠的還原資料來實現讀取一致性。所以選A。-
ORA-01555: snapshot too old: rollback segment number string with name "string" too small
- Cause: rollback records needed by a reader for consistent read are overwritten by other writers
- Action: If in Automatic Undo Management mode, increase undo_retention setting. Otherwise, use larger rollback segments
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