The modified data are not available on disk.
The modified data have been flushed out from memory.
The modified rows of the SupportCenter STAFF table have been locked.
Jack has not committed the changes after modifying the value.
Both users are accessing the database from two different machines.
第1题：
You have altered a non-unique index to be invisible to determine if queries execute within an acceptable response time without using this index.Which two are possible if table updates are performed which affect the invisible index columns?（）
A. The index remains invisible.
B. The index is not updated by the DML statements on the indexed table.
C. The index automatically becomes visible in order to have it updated by DML on the table.
D. The index becomes unusable but the table is updated by the DML.
E. The index is updated by the DML on the table.
第2题：
Two database users， Jack and Bill， are accessing the Certkiller STAFF table of the Certkiller DB database. When Jack modifies a value in the table， the new value is invisible to Bill. Which is the modified value invisible to Bill？（）
第3题：
When() a documentary bill, our bank buys the bill and the documents for the face value less discount.
A、we negotiating
B、negotiated
C、negotiating
D、we are negotiating
第4题：
Identify the two situations in which you use the alert log file in your database to check the details.（）
第5题：
In which two ways can you influence how downstream LSRs treat MPLS traffic?（）
第6题：
In which two ways can you influence how downstream LSRs treat MPLS traffic？（）
第7题：
You are planning to import customer data from the Customer table and the Country table in your SQL Server 2000 database into a SQL Server 2005 database. You want to ensure that during the import process，each value in the CountryCode column of the Customer table has a corresponding record in the CountryCode column in the Country table of the SQL Server 2005 database. You define a foreign key between these two tables. Thus，referential integrity will guarantee that the import routine fails if there are any records where a CountryCode value does not exist in the Country table but does exist in the Customer table. You need to ensure that the import process does not fail if records are encountered that do not exist in the Country table. What should you do？（）
第8题：
You are investigating the performance of the server and see the following information: Events_waits_summary_global_by_event_name in the performance schema shows that the wait/synch/mutex/sql/LOCK_table_cache event is dominating other wait events. The table_open_cache_overflows status variable is 0.Which action should be taken to remove the performance bottleneck described here?（）
A.Increase the value of table_definition_cache
B.Increase the value of table_open_cache_instances
C.Decrease the value of table_open_cache_instances
D.Increase the value of table_open_cache
E.Decrease the value of table_definition_cache
F.Decrease the value of table_open_cache
第9题：
You have a range-partitioned table in your database. Each partition in the table contains the sales data for a quarter. The partition related to the current quarter is modified frequently and other partitions undergo fewer data manipulations. The preferences for the table are set to their default values. You collect statistics for the table using the following command in regular intervals： SQL> EXECUTE DBMS_STATS.GATHER_TABLE_STATS（’SH’，’SALES’，GRANULARITY=>’GLOBAL’）； You need statistics to be collected more quickly. What can you do to achieve this？（）
第10题：
You are investigating the performance of the server and see the following information: Events_waits_summary_global_by_event_name in the performance schema shows that the wait/synch/mutex/sql/LOCK_table_cache event is dominating other wait events. The table_open_cache_overflows status variable is 0. Which action should be taken to remove the performance bottleneck described here?（）