In Sql Server 2008,2012 can temp tables have full text indexes?
When I run the command
CREATE FULLTEXT INDEX ON #temp (SearchTerms) KEY INDEX [ix_clustered] ON FTC;
I get
Invalid object name '#temp'
Should this work? MSDN technet doesn't list it as a limitation.
According to the documentation, no it is not possible:
A full-text index must be defined on a base table; it cannot be
defined on a view, system table, or temporary table.
This should be clarified to point out that since the version that documentation was written for, indexed views were added to SQL Server, and documentation there states that:
one full-text index is allowed per table or indexed view
Related
I have a tool by Oracle called SQL Developer. I have created a table called multicarrier_ClaimTraceDetails. Before this I tried creating the same table with name (actually same name but with lower case, which I had to delete it and create this new one). But when I to see the structure of table, I see every column twice in the table.
I have below questions about this behavior:
Why is it happening?
How can I correct it?
Didn't my previous/old table got deleted? (though I don't see it in the list of tables in left panel)
When I create a full text index on a temporary table #Table in a query? I got Invalid name object #Table.
Is creating full text index possible in sql server?
According to the documentation, no it is not possible:
A full-text index must be defined on a base table; it cannot be
defined on a view, system table, or temporary table.
This should be clarified to point out that since the version that documentation was written for, indexed views were added to SQL Server, and documentation there states that:
one full-text index is allowed per table or indexed view
I am trying to modify a stored procedure ( adding a new column in select statement) but I am getting this error:
Cannot use a CONTAINS or FREETEXT predicate on table or indexed view 'vwPersonSearch' because it is not full-text indexed.
When I try to create a Full text index on view 'vwPersonSearch' using SQL server 2008 R 2 management studio, I am getting this error:
A unique column must be defined on this table/view.
Please suggest solution to it
To create a full text index, you must specify a key index, which must be a unique, single-key, non-nullable column. An integer column type is recommended for best performance.
See http://technet.microsoft.com/en-us/library/ms187317.aspx for more details.
You may alter a column to be unique if that's one that could be or add an id of some sort to do that part.
What is the diffrence between composite index and covering index in Sql Server ?
A covering index is a composite index that contains every column you are currently retrieving with your select statement and that participates in the where clause. It is one of the best ways to improve query performance substantially.
A covering index is a composite index that covers (hence the name) all columns that are necessary to fulfill a query or a join condition.
There is nothing special about SQL server here, these are generic designations.
A composite index is also a covering index when the index contains your search criteria and all the data your query is attempting to retrieve. In this example:
SELECT a,b,c FROM Foo WHERE a = 'FooFoo'
A covering index would contain column a (your search predicate) as well as the columns b and c.
In this case SQL Server is optimized to return those values found in the index and does not need to make an additional look up in the actual table. If b and c are frequently returned but rarely searched on then the index might be set up such that b and c are included in the index but not indexed.
Before SQL Server 2005 DBA's would add additional 'covering' columns to their indexes to achieve this optimization. In SQL Server 2005 an additional feature was added that allowed you to include covering columns in the leaf nodes of the index that were not part of the index tree. When creating an index you can specify additional 'covering' columns in the include clause. These columns will not be indexed but added to the leaf node of the index saving SQL Server from looking up the additional data in the main table. Adding the data to the include clause saves SQL Server the overhead of adding the additional data to the search tree while gaining the optimization that a covering index brings.
Can MS SQL support full-text indexing for a view that connects (joins or unions) multiple databases?
Yes, absolutely. Each index will be queried individually and the results will be combined by the engine.
For example, if you've got:
DatabaseA, TableA, FieldA with a full text index
DatabaseB, TableB, FieldB with a full text index
And you have a view that includes both fields from both tables in both databases, it'll work fine when you query that view. From SQL Server's perspective, it doesn't matter whether they're in the same database or not.
If that doesn't match your scenario, try posting more detail about your challenges. Thanks!
No, not at all.
You cannot create a full text index on a table or view without an index.
You cannot create a view with a clustered index that contains Left/right joins or Unions.
You can do a full text search on a view that contains data from another database, but only if it contains a single table or inner joined tables.