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[单选] You work as a database administrator for Certkiller .com. In your database server, the parameter PLSQL_OPTIMIZE_LEVEL has been set to 2. What would this setting achieve?()

A . It degrades the run time and compiler performance.
B . It provides better run time and compiler performance.
C . It provides better optimization of the statement during parse time.
D . It forces the rule based optimizer to be used for statement optimization.
E . It provides better run time performance but slightly degraded compiler performance. 
F . It provides better run time performance but slightly degraded run time performance.

Evaluate the following SQL statements that are issued in the given order:  What would be the status of the foreign key EMP_MGR_FK?()  It would be automatically enabled and deferred.。  It would be automatically enabled and immediate.。  It would remain disabled and has to be enabled manually using the ALTER TABLE command.。  It would remain disabled and can be enabled only by dropping the foreign key constraint and re-creating it.。 用伏安法测量输电线路导线的直流电阻时,若在首端加电压,选择的测量顺序是()。 末端短路,首端测电流,末端测电压。 末端短路,首端测电压,测电流。 首端短路,末端测电流,首端测电压。 目前我国工程造价信息化建设还处于起步阶段,造价信息发布机制尚不完善,工程造价信息数据()有待提高。 A.标准化 。 B.时效性 。 C.准确性 。 D.临时性。 An Enterprise customer wants to reduce the configuration effort for their Teleworker router deployments. What is one way to simplify the IPSec-related configuration in the remote routers?() CiscoWorks VPN Manager 。 deploy Linksys routers with menu-driven configuration。 Easy VPN client mode 。 disable 802.1x and Auth Proxy on the Teleworker router。 Your multitenant container database (CDB) is running in ARCHIVELOG mode. You connect to the CDB RMAN. Examine the following command and its output: You execute the following command: RMAN > BACKUP DATABASE PLUS ARCHIVELOG; Which data files will be backed up?() Data files that belong to only the root container。 Data files that belong to the root container and all the pluggable databases (PDBs)。 Data files that belong to only the root container and PDB$SEED。 Data files that belong to the root container and all the PDBs excluding PDB$SEED。 You work as a database administrator for Certkiller .com. In your database server, the parameter PLSQL_OPTIMIZE_LEVEL has been set to 2. What would this setting achieve?()
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