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How To Know Which Index A Table Is Using?
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Posted Date :
December 03, 2010
SELECT table_name,index_name FROM user_constraints
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How To Know Which Index A Table Is Using?
Which type of index physically orders the rows in a table?
how many clustered and non-clustered index can a table have
In SQL 2005 and earlier there was a limitation of 250 indexes per table, one clustered and 249 non-clustered. In SqL 2008, with the addition of filtered indexes, that limitation was increased to 1000, one clustered and 999 non-clustered indexes.
What is a table called, if it does not have neither Cluster nor Non-cluster Index? What is it used for?
Unindexed table or Heap. Microsoft Press Books and Book On Line (BOL) refers it as Heap.
A heap is a table that does not have a clustered index and, therefore, the pages are not linked by
pointers. The IAM pages are the only structures that link the pages in a table together.
Unindexed tables are good for fast storing of data. Many times it is better to drop all indexes from table and than do bulk of inserts and to restore those indexes after that.
What are the index combination's a table can have?
? A clustered index
? A clustered index and many nonclustered indexes
? A nonclustered index
? Many nonclustered indexes
You work for a bank that uses a SQL Server 2005 database to store line items from customer banking transactions. The bank processes 50,000 transactions every day. The application requires a clustered index on the TransactionID column. You need to create a
table that supports an efficient reporting solution that queries the transactions by date.What are the two ways to achieve this goal? (Each correct answer presents a complete solution. Choose two.)
A. Place a nonclustered index on the date column.
B. Add a unique clustered index on the date column
C. Map each partition to a filegroup, with each filegroup accessing a different physical
D. Create a partitioning scheme that partitions the data by date.
What are the different index configurations a table can have?
A table can have one of the following index configurations:
A clustered index
A clustered index and many nonclustered indexes
A nonclustered index
Many nonclustered indexes
Which index option causes SQL Server to create an index with empty space on
the leaf level of the index?
Which levels of the index can have multiple pages?
What is a Index?
To execute the Quesry faster
What is an Index?
When queries are run against a db, an index on that db basically helps in the way the data is sorted to process the query for faster and data retrievals are much faster when we have an index.
What are the privileges that can be granted on a table by a user to others?
Insert, update, delete, select, references, index, execute, alter, all
Which system table contains information on constraints on all the tables created?
What command is used to create a table by copying the structure of another table?
CREATE TABLE .. AS SELECT command
To copy only the structure, the WHERE clause of the SELECT command should contain a FALSE statement as in the following.
CREATE TABLE NEWTABLE AS SELECT * FROM EXISTINGTABLE WHERE 1=2;
If the WHERE condition is true, then all the rows or rows satisfying the condition will be copied to the new table.
What is Index?
An index is a physical structure containing pointers to the data. Indices are created in an existing table to locate rows more quickly and efficiently. It is possible to create an index on one or more columns of a table, and each index is given a name. The users cannot see the indexes; they are just used to speed up queries. Effective indexes are one of the best ways to improve performance in a database application. A table scan happens when there is no index available to help a query. In a table scan SQL Server examines every row in the table to satisfy the query results. Table scans are sometimes unavoidable, but on large tables, scans have a terrific impact on performance
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