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【单项选择题】

A（）is created by a pressure gradient or slope in the water level.

A、A.gradient current

B、B.density current

C、C.swift current

D、D.torrent current

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更多“A（）is created by a pressure gradient or slope in the water level.”相关的问题
第1题
[单选题] What is true about sequences?（）

A、Once created, a sequence belongs to a specific schema.  B、Once created, a sequence is linked to a specific table.  C、Once created, a sequence is automatically available to all users.  D、Only the DBA can control which sequence is used by a certain table.  E、Once created, a sequence is automatically used in all INSERT and UPDATE statements.  

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第2题
[单选题] What is true about sequences?（）

A、Once created, a sequence belongs to a specific schema.  B、Once created, a sequence is linked to a specific table.  C、Once created, a sequence is automatically available to all users.  D、Only the DBA can control which sequence is used by a certain table.  E、Once created, a sequence is automatically used in all INSERT and UPDATE statements.  

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第3题
[单选题] You are managing an Oracle Database 10g database that uses Oracle Managed Files （OMF）. You enabled the block change tracking feature for the database. Which statement regarding the change tracking file is true？（）

A、 One block change tracking file is created for each data file. By default， the file is created in DB_CREATE_FILE_DEST.  B、 One block change tracking file is created for each data file. By default， the file is created in BACKGROUND_DUMP_DEST.  C、 One block change tracking file is created for the database. By default， the file is created in DB_CREATE_FILE_DEST.  D、 One block change tracking file is created for the database. By default， the file is created in BACKGROUND_DUMP_DEST.  

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第4题
[] What is true about sequences? （）

A、A. Once created, a sequence belongs to a specific schema.  B、B. Once created, a sequence is linked to a specific table.  C、C. Once created, a sequence is automatically available to all users.  D、D. Only the DBA can control which sequence is used by a certain table.  E、E. Once created, a sequence is automatically used in all INSERT and UPDATE statements.  

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第5题
[单选题] You are granted the CREATE VIEW privilege. What does this allow you to do?（）

A、Create a table view.  B、Create a view in any schema.  C、Create a view in your schema.  D、Create a sequence view in any schema.  E、Create a view that is accessible by everyone.  F、Create a view only of it is based on tables that you created.  

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第6题
[单选题] You are granted the CREATE VIEW privilege. What does this allow you to do? （）

A、Create a table view.  B、Create a view in any schema.  C、Create a view in your schema.  D、Create a sequence view in any schema.  E、Create a view that is accessible by everyone.  F、Create a view only of it is based on tables that you created.  

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第7题
[] You are granted the CREATE VIEW privilege. What does this allow you to do?（）

A、A. Create a table view.  B、B. Create a view in any schema.  C、C. Create a view in your schema.  D、D. Create a sequence view in any schema.  E、E. Create a view that is accessible by everyone.  F、F. Create a view only of it is based on tables that you created.  

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第8题
[多选题] On your Oracle Database, you issue the following commands to create indexes: SQL > CREATE INDEX oe.ord_customer_ix1 ON oe.orders (customer_id, sales_rep_id) INVISIBLE; SQL> CREATE BITMAP INDEX oe.ord_customer_ix2 ON oe.orders (customer_id, sales_rep_id); Which two statements are true?（）

A、Only the ORD_CUSTOMER_IX1 index created.  B、Both the indexes are updated when a row is inserted, updated, or deleted in the ORDERS table.  C、Both the indexes are created: however, only ORD_CUSTOMERS_IX1 is used by the optimizer for queries on the ORDERS table.  D、The ORD_CUSTOMER_IX1 index is not used by the optimizer even when the OPTIMIZER_USE_INVISIBLE_INDEXES parameters is set to true.  E、Both the indexes are created and used by the optimizer for queries on the ORDERS table.  F、Both the indexes are created: however, only ORD_CUSTOMERS_IX2 is used by the optimizer for queries on the ORDERS table.  

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第9题
[多选题] Which statements are true regarding the system-defined moving window baseline in Oracle Database 11g?（）

A、It does not allow you to change the moving window size.  B、Adaptive threshold functionalities use it by default to compute statistics.  C、It is created by default with the window size being equal to the AWR retention time.  D、It is created when the first snapshot is collected by the Automatic Workload Repository (AWR).  

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第10题
[多选题] Which two statements regarding a SQL profile are true?（）

A、It is built by Automatic Tuning Optimizer.  B、It cannot be stored persistently in the data dictionary.  C、It can be used by the query optimizer automatically.  D、It can be created manually by using the CREATE PROFILE command.  

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