名词解释题稳定指数（stability index（Lyzner index））
名词解释题
稳定指数（stability index（Lyzner index））
参考解析
解析：
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变量定义语句Dim Index与下面的______等价。 ( )A．Dim Index As LongB．Dim Index As IntegerC．Dim Index As SingleD．Dim Index As Double
打开阿里指数首页的网址是（）。A、http：//www.1688.comB、http：//index.1688.comC、http：//www.taobao.comD、http：//index.taobao.com
下列属于：eq（index）与：nth-child（index）的区别的有（）。A、：eq（index）只匹配一个元素，而：nth-child（index）将为每一个符合条件的父元素匹配子元素B、：eq（index）的index从0开始，而：nth-child（index）的index从1开始C、：eq（index）的index从1开始，而：nth-child（index）的index从0开始D、：eq（index）匹配多个元素，而：nth-child（index）将为每一个符合条件的父元素匹配子元素
为了监视索引的空间使用效率，可以首先分析该索引的结构，使用（）语句，然后查询INDEX_STATE视图。A、SELECT INDEX … VALIDATE STRUCTUREB、ANALYZE INDEX … VALIDATE STRUCTUREC、UPDATE INDEX … VALIDATE STRUCTURED、REBUILD INDEX … VALIDATE STRUCTURE
A bitmap join index is defined as（）.A、An index used to join two bitmap indexes on a table.B、A bitmap index created for the join of two or more tables.C、A bitmap index created on the join of two or more indexes.D、A bitmap index created on the join of two or more indexed-organized tables.
You have altered a non-unique index to be invisible to determine if queries execute within an acceptable response time without using this index. Which two are possible if table updates are performed which affect the invisible index columns?（）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.
单选题You are a DBA of your company. You created a database named SALES on an Oracle 10g instance. You have defined an index named INDEX1 on the database table named INVENTORY. Users are complaining that queries accessing the INVENTORY table are running slow. Upon investigation you determine that the tablespace where the index is located is experiencing high I/O and you decide to relocate the index to another tablespace. Which of these will be the best way to accomplish this objective？（）A Rebuild the index.B Coalesce the index.C Drop and re-create the index in the new tablespace.D Relocate the index using the ALTER INDEX...MOVE statement.
单选题为了监视索引的空间使用效率，可以首先分析该索引的结构，使用（）语句，然后查询INDEX_STATE视图。ASELECT INDEX … VALIDATE STRUCTUREBANALYZE INDEX … VALIDATE STRUCTURECUPDATE INDEX … VALIDATE STRUCTUREDREBUILD INDEX … VALIDATE STRUCTURE
多选题You have altered a non-unique index to be invisible to determine if queries execute within an acceptable response time without using this index. Which two are possible if table updates are performed which affect the invisible index columns?（）AThe index remains invisible.BThe index is not updated by the DML statements on the indexed table.CThe index automatically becomes visible in order to have it updated by DML on the table.DThe index becomes unusable but the table is updated by the DML.EThe index is updated by the DML on the table.