[单选] （）是衡量建筑物是否稳定的重要依据，尤其对置于软基处理地基上的建筑物，沉降资料是判别软基处理效果、地基是否完成固结沉降的重要依据。

What advantage would you get if you increase the length of time during which the undo information would be stored in the database？（） roll back of large transactions。 roll forward to redo a transaction。 data concurrency for large updates。 read consistency for long-running transactio。 You are administering a database and you receive a requirement to apply the following restrictions: 1. A connection must be terminated after four unsuccessful login attempts by user. 2. A user should not be able to create more than four simultaneous sessions. 3. User session must be terminated after 15 minutes of inactivity. 4. Users must be prompted to change their passwords every 15 days. How would you accomplish these requirements?（） by granting a secure application role to the users。 by creating and assigning a profile to the users and setting the REMOTE_OS_AUTHENT parameter to false。 By creating and assigning a profile to the users and setting the SEC_MAX_FAILED_LOGIN_ATTEMPTS parameter to 4。 By Implementing Fine-Grained Auditing (FGA) and setting the REMOTE_LOGIN_PASSWORD_FILE parameter to none.。 By implementing the database resource Manager plan and setting the SEC_MAX_FAILED_LOGIN_ATTEMPTS parameters to 4.。 下列（）驱动方式不适合开孔机选用。 人工。 液压。 气压。 太阳能。 社会保险基金的会计核算基础是权责发生制。 You execute the following command toauditdatabase activities：  SQL>AUDITDROP ANY TABLE BY scott BY SESSION WHENEVER SUCCESSFUL；  What is the effect of this command（） Oneauditrecord is created for every successful DROP TABLE command executed in the session ofSCOTT.。 Oneauditrecord is generated for the session when SCOTT grants the DROP ANY TABLE privilege toother users.。 One audit record is created for the whole session if user SCOTT successfully drops one or more tablesin his session.。 One audit record is created for every session of any other user in which a table owned by SCOTT isdropped successfully.。 One audit record is created for every successful DROP TABLE command executed by any user to droptables owned by SCOTT.。 （）是衡量建筑物是否稳定的重要依据，尤其对置于软基处理地基上的建筑物，沉降资料是判别软基处理效果、地基是否完成固结沉降的重要依据。