You are working in an online transaction processing （OLTP） environment. You used the FLASHBACK TABLE command to flash back the CUSTOMERS table. Before executing the FLASHBACK TABLE command， the System Change Number （SCN） was 663571. After flashing back the CUSTOMERS table，you realize that the table is not in the correct state and the resultant changes are not what you had desired. So， you need to reverse the effects of the FLASHBACK TABLE command while ensuring that： a） No other user data in the database is affected. b） The operation takes the minimum possible time. Which option would you choose？（） use the ROLLBACK command with SCN 663571。 perform Flashback Transaction Query with SCN 663571。 execute the FLASHBACK DATABASE statement to retrieve the CUSTOMERS table as it was at SCN 663571。 execute another FLASHBACK TABLE statement to retrieve the CUSTOMERS table as it was at SCN 663571。
You want to create a role to meet these requirements： 1. The role is to be protected from unauthorized usage. 2. The password of the role is not to be embedded in the application source code or stored in a table. method would you use to restrict enabling of such roles（） Create the role with external authentication.。 Create the role as a secure application role.。 Create the role as a password-protected role.。 Create a role and use Fine-Grained Access Control （FGAC） to secure the role。
【背景资料】某工业厂房车间3层，7度抗震设防。高度20m，长度为70m，独立基础，结构形式为砌体承重结构。在建成使用几个月后发现底层局部地面呈锅底形下沉，砼地面脱落、开裂，后来又发生墙体开裂，裂缝呈正八字裂缝和斜向裂缝，裂缝宽度达1mm～2mm，一般分布在底层中下部，且首先在窗对角突破，严重影响了建筑物的使用和工厂面貌，给工厂造成了重大的经济损失。经翻阅资料发现，该仓房实际上处于软弱土层，且为淤泥质土，地勘报告不准确；最终认定是由于地面不均匀沉降造成的危害
对于施工阶段沉降观测，主体封顶后，必须按（）1次的频率进行观测。 1～2个月。 2～3个月。 3～4个月。 4～5个月。
View the Exhibit for some of the current parameter settings. A user logs in to the HR schema and issues the following commands: SQL> CREATE TABLE emp (empno NUMBER(3), ename VARCHAR2(20), sal NUMBER(8,2)); SQL> INSERT INTO emp(empno,ename) VALUES(1,'JAMES'); At this moment, a second user also logs in to the HR schema and issues the following command: SQL> ALTER TABLE emp MODIFY sal NUMBER(10,2); What happens in the above scenario?（） The second user's session immediately produces the resource busy error.。 The second user's command executes successfully.。 The second user's session waits for a time period before producing the resource busy error.。 A deadlock is created.。
出现施工进度严重拖延，并可能因此影响合同目标时，监理机构应采取的做法是（）。 及时发出加快工程进展或加速施工指令，但不能直接向承包人发出调整、修改施工进度计划的指示。 及时发出加快工程进展或加速施工指令，或直接向承包人发出调整、修改施工进度计划的指示。 向业主报告，经业主同意后向承包人发出调整、修改施工进度计划的指示。 向业主报告，并协助业主调整、修改总进度计划。
在选择动火作业点时，要求不正确的是（）
