解释data block ， extent 和 segment的区别（这里建议用英文术语）
在数据封装中PDU的正确顺序是()。A.data，packet，frame，segment，BitB.data，packet，segment，frame，BitC.data，segment，frame，packet，BitD.data，segment，packet，frame，Bit
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The DB_BLOCK_CHECKING initialization parameter is set to OFF.Which block checking would be performed?()A. The Oracle database will perform block checking for the index blocks onlyB. The Oracle database will not perform block checking for any of the data blocksC. The Oracle database will perform block checking for the default permanent tablespace onlyD. The Oracle database will perform block checking for the data blocks in all user tablespacesE. The Oracle database will perform block checking for the data blocks in the SYSTEM tablespace only
A PC on a network segment sends data to another PC on a different segment.Which of the following correctly describe the correct order of how this data will be encapsulated?()A. Data, Frame, Packet, Segment, BitB. Data, Frame, Segment, Packet, BitC. Data, Packet, Frame, Segment, BitD. Data, Packet, Segment, Frame, BitE. Data, Segment, Frame, Packet, BitF. Data, Segment, Packet, Frame, Bit
oracle逻辑存储结构正确的是（）A、tablespace--segment--osblock--blockB、tablespace--segment--extent--blockC、tablespace--extent--segment--blockD、tablespace--extent--block–segment
Which two statements correctly describe the relation between a data file and the logical databasestructures（）A、An extent cannot spread across data files.B、A segment cannot spread across data files.C、A data file can belong to only one tablespace.D、A data file can have only one segment created in it.E、A data block can spread across multiple data files as it can consist of multiple operating system （OS） blocks.
You want the size of the tablespace to increase when it is full. Which option would you use？（）A、use automatic extent allocationB、disable threshold for the tablespaceC、use freelists to manage the free spaceD、use automatic segment space managementE、create the tablespace as a bigfile tablespaceF、use the RESIZE clause while creating the tablespaceG、enable AUTOEXTEND for at least one of the data files in the tablespace
You are creating the DEPT_SAL data block from the PAYHIST form. Users should be able to enter a valid department ID number, which will then display the employee salary information for that department. This data block could potentially retrieve a large number of records. Since users will probably only view a small number of these records, only 10 records should be fetched at one time. How would you create the data block?（）A、Select The Data Blocks node in the Object Navigator and click the Create button. Choose to build the data block manually, enter the procedure name in the Query Data Source Columns property, and the procedure code in the Query Data Source Arguments property. B、Choose Tools -> Data Block Wizard, select Table as the data source type, and base the block on the columns from the tables. C、Choose Tools -> Data Block Wizard, select, View as the data source type, and base the block on the columns from the tables. D、Select the Data Blocks node in the Object Navigator and click the Create button. Choose to build the data block manually, alter the Query Data Source Type property to 'FROM clause query', and enter the SELECT statement in the Query Data Source Name property. E、Select the Data Block node in the Object Navigator and click the Create button. Alter the Query Data Source Type, Query Data Source Name, Query Data Sources Columns, and Query Data Source Arguments properties to create a stored procedure that uses a red cursor.
