If you need an offline installation, locate the Full-text Search package download in the Release notes. Full-Text Search uses word breakers that determine how to identify individual words based on language. You can get a list of registered word breakers by querying the sys. Word breakers for the following languages are installed with SQL Server:.
Full-Text Search also works with text stored in binary files. But in this case, an installed filter is required to process the file. For more information about filters, see Configure and Manage Filters for Search.
This was a topic I discovered with dismay when interviewing DBA candidates for my current company. Only two of a whole slew of potential employees understood SQL Server and the services it uses, which made me pause. I did, however, impress upon them it was essential to understand how SQL Server ran, because that could ultimately answer certain problems encountered in a typical production environment.
As for the developers, I'll forgive them, because it isn't really their job to know. The NT administrators on the other hand So this article will concentrate on the basic services under which SQL Server runs. By understanding how SQL Server operates and the permissions thereof, we can quickly narrow down on issues that will occur in a production environment.
Not a pretty sight! Now that we're familiar with the names of the services, let's look at each in turn. Under Windows , it is administered under Component Services. Upgrade to Microsoft Edge to take advantage of the latest features, security updates, and technical support. Feedback will be sent to Microsoft: By pressing the submit button, your feedback will be used to improve Microsoft products and services.
Privacy policy. SQL Server databases are full-text enabled by default. Before you can run full-text queries, however, you must create a full text catalog and create a full-text index on the tables or indexed views you want to search. Each full-text index must belong to a full-text catalog.
You can create a separate text catalog for each full-text index, or you can associate multiple full-text indexes with a given catalog. A full-text catalog is a virtual object and does not belong to any filegroup.
The catalog is a logical concept that refers to a group of full-text indexes. The following two-part example creates a full-text catalog named AdvWksDocFTCat on the AdventureWorks sample database and then creates a full-text index on the Document table in the sample database. This statement creates the full-text catalog in the default directory specified during SQL Server setup.
Before you can create a full-text index on the Document table, ensure that the table has a unique, single-column, non-nullable index. After columns have been added to a full-text index, users and applications can run full-text queries on the text in the columns. These queries can search for any of the following:. One or more specific words or phrases simple term.
A word or a phrase where the words begin with specified text prefix term. Inflectional forms of a specific word generation term. A word or phrase close to another word or phrase proximity term.
Synonymous forms of a specific word thesaurus. Words or phrases using weighted values weighted term. A LIKE query against a large amount of unstructured text data is much slower than an equivalent full-text query against the same data.
A LIKE query against millions of rows of text data can take minutes to return; whereas a full-text query can take only seconds or less against the same data. Databases indexes are used to enhance performance when looking for something defined in your WHERE clause.
However when it comes to filtering some text, e. Then searches are slow, because the way database indexes work is optimised for matches against the whole content of a column and not just a part of it. In specific the LIKE search which includes wildcards cannot make use of any kind of index. So, it seems that using Full-Text Search on your queries will improve substantially the speed execution.
0コメント