You find this query being used in your Oracle 12c database: Which method a used by the optimizer to limit the rows being returned?（）

A . By enabling the Slow Query Log because all queries that are not using indexes will be logged automatically B . By enabling the Error Log because not using indexes is an error C . By enabling the Slow Query Log and using the – log-queries-not-using-indexes option D . By enabling the Error Log and using the – log-queries-not-using-indexes optio

A . create baseline metrics for today’s performance B . write the current database metrics to a database table and create a trigger to compare with future database statistics C . write the current database metrics to a flat file and create an operating script to compare with future database statistics D . write the current database metrics to a database table and create a procedure to compare with future database statistics E . write the current database metrics to a database table and submit a job using DBMS_JOB to compare with future database statistic

A . audit trail B . alert log file C . user trace file D . online trace file E . background trace file F . operating system event viewer

A . The index remains invisible. B . The index is not updated by the DML statements on the indexed table. C . The index automatically becomes visible in order to have it updated by DML on the table. D . The index becomes unusable but the table is updated by the DML. E . The index is updated by the DML on the table.

A . audit trail B . alert log file C . user trace file D . online trace file E . background trace file F . operating system event viewer

A . The SGA_TARGET is a static parameter. B . The instance is started， but the database is not yet open. C . The server parameter file （SPFILE） was used to start the instance. D . The SGA_TARGET parameter does not have any effect onthe databaseinstance untiltheSGA_MAX_SIZE parameter is specified.

A . cost B . price C . value D . expenditure

A . Jack the vessel back up to a safe height B . Proceed on to your next destination since the list is unimportant C . Pump out all ballast to gain reserve buoyancy D . Notify the Coast Guard

A . guarantee undo retention B . add one more redo log group C . size the redo log files appropriately D . size the UNDO tablespace appropriately E . size the SYSTEM tablespace appropriately F . configure an appropriate undo retention interval G . change automatic undo management to manual

A . edge B . central C . Layer2 D . Layer3

A . vector  B . database view  C . database table  D . transactional trigger  E . PL/SQL table of records  F . multi-dimensional array

A . LOST B . INVALID C . EXPIRED D . DELETED E . CORRUPT F . UNKNOWN G . OBSOLETE

During the hours when you labor through your work you may say that you're "hot. "That's true. The time of day when you feel most energetic is when your cycle of body tem-perature is at its peak (顶峰). For some people, the peak comes during the forenoon. For others it comes in the afternoon or evening. No one has discovered why this is so, but it leads to such familiar monologues (自言自语) as: "Get up, John. You'll be late for work again. " The possible explanation to the trouble is that John is at his temperature-an-ener-gy peak in the evening. Much family quarrelling ends when husbands and wives real-ize what these energy cycles mean and which cycle each member of the family has. You can't change your energy cycle, but you can learn to make your life fit it better. Dr. Kleitman believes that habit can help. Maybe you're sleepy in the evening but feel you must stay up late anyway. Counteract (对抗) your cycle to some extent by habitually stay-ing up later than you want. If your energy is low in the morning but you have an important job to do early in the day, rise before your usual hour. This won't change your cycle, but you'll get up steam (振作精神) and work better at your low point. Get off to a slow start which saves your energy. Get up with a leisurely yawn (打哈欠) and stretch. Sit on the edge of the bed a minute before putting your feet on the floor. Avoid the troublesome search for clean clothes by laying them out the night before. When-ever possible, do routine work in the afternoon and save tasks requiring more energy or concentration for your sharper hours. According to the writer, if a person finds getting up early a problem, most proba-bly ______. A．he refuses to follow his own energy cycle B．he is a lazy person C．he is not sure when his energy is low D．he is at his peak in the afternoon or evening

A.useful B.valuable C.worth D.good

M: It won't happen again, I assure you. W: This is the last time I believe you. What is the most probable relationship of the two people？ A．Doctor and patient. B．Boss and employee. C．Receptionist and tourist. D．Teacher and student.

A. The index remains invisible. B. The index is not updated by the DML statements on the indexed table. C. The index automatically becomes visible in order to have it updated by DML on the table. D. The index becomes unusable but the table is updated by the DML. E. The index is updated by the DML on the table.

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A stage is actually a box. One side of the box has been removed so the audience can see what's going on inside. The actors remain at a fixed audience. In the film, however, the camera can bring the audience up close and fix their attention on small but important things: a frightened look, a whisper, a trembling of hands. The camera offers the film maker freedom allowing him to move easily across barriers (界限) of time and space. He can show his action in real cities and on real farms. He can also use the camera to change the scene dozens of times in one film. No expert of the stage can do this. The main idea of the text is that______. A．stage plays and films are two different kinds of art B．it is always disappointing to turn play into films C．films have certain advantages over stage plays D．the camera has made film making easy and possible

A.help B.helpful C.helpless D.helpfully

During the hours when you labor through your work you may say that you’re “hot”. That’s true. The time of day when you feel most energetic is when your cycle of body temperature is at its peak. For some people the peak comes during the afternoon. For others it comes in the afternoon or evening. No one has discovered why this is so, but it leads to such familiar monologues (自言自语) as: “Get up, John! You’ll be late for work again!” The possible explanation to the trouble is that John is at his temperature-and-energy peak in the evening. Much family quarrelling ends when husbands and wives realize what these energy cycles mean, and which cycle each member of the family has. You can’t change your energy cycle, but you can learn to make your life fit it better. Habit can help, Dr. Kleitman believes. Maybe you’re sleepy in the evening but feel you must stay up late anyway. Counteract (对抗) your cycle to some extent by habitually staying up later than you want to. If our energy is low in the morning but you have an important job to do early in the day, rise before your usual hour. This won’t change your cycle, but you’ll get up steam (鼓起干劲) and work better at your low point. Get off to a slow start which saves your energy. Get up with a leisurely yawn and stretch. Sit on the edge of the bed a minute before putting your feet on the floor. Avoid the troublesome search for clean clothes by laying them out the night before. Whenever possible, do routine work in the afternoon and save tasks requiring more energy or concentration for your sharper hours. 第31题：If a person finds getting up early a problem, most probably ________. A) he is a lazy person B) he refuses to follow his own energy cycle C) he is not sure when his energy is low D) he is at his peak in the afternoon or evening