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1.无穷级数到底在研究什么？ 2.正项级数及根据定义判别正项级数是否收敛？ 3.正项级数的比较判别法 级数是指将数列 的项 ， ，…， ，…依次用加号连接起来的函数，是数项级数的简称。如： ，简写为 ， 称为级数的通项，记 称之为级数的部分和。如果当 时 ，数列Sn有极限,极限为S，则说级数收敛，并 阅读全文
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You have statistics collected for some selected tables. Your requirement is that the statistics for the tables and all dependent indexes must not be o 阅读全文
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To make audit information more productive, the DBA executes the following command before starting an audit operation:SQL> ALTER SYSTEM SET AUDIT_TRAIL 阅读全文
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You execute the following command to audit database activities:SQL> AUDIT DROP ANY TABLE BY scott BY SESSION WHENEVER SUCCESSFUL;What is the effect of 阅读全文
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In your production database, data manipulation language (DML) operations are executed on the SALES table. You have noticed some dubious values in the 阅读全文
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A user, who is authenticated externally, logs in to a remote machine and connects to the databaseinstance. What action would you take to ensure that a 阅读全文
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Some non-DBA users in your database have been granted ANY TABLE system privileges and theyare able to access data dictionary base tables. You decide t 阅读全文
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Your database instance is running with full workload after database creation. You have decided to use a fixed-size undo tablespace. You want to use th 阅读全文
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Which statement is true about the UNDO_RETENTION parameter when retention guarantee is not enabled?A.It is the time period after which the undo data b 阅读全文
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In which situation may the UNDO_RETENTION parameter be ignored, even if it is set to a value?A. When the data file of the undo tablespace is autoexten 阅读全文
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View the Exhibit and examine the undo tablespace attributes. Your database instance is experiencing a large volume of transactions from non-DBA users 阅读全文
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Which two statements are true regarding undo tablespaces? (Choose two.)A.The database can have more than one undo tablespace.B.The UNDO_TABLESPACE par 阅读全文
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Which three operations require undo data? (Choose three.)A.committing a transactionB.flashing back a transaction – 回退操作C.recovering a failed transacti 阅读全文
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Which two statements correctly describe the relation between a data file and the logical databasestructures? (Choose two.)A.An extent cannot spread ac 阅读全文