try sql queries online

consistent with the result set obtained by each stage of logical processing. The optimizer will try many variants of the query to find the plan with the lowest cost. If the optimizer analyzes the metadata of the query and learns that there is only one executable plan, it will no longer try to find a better plan. This step is called fine plan optimization. If no minor optimization plan is found,

SQL Server blocks access to the statement 'openrowset/OpenDataSource 'of the 'ad hoc distributed queries' component because this component has been disabled as part of the server's security configuration. The system administrator can enable 'ad hoc distributed queries 'by using sp_configure '. For more information about enabling 'ad hoc distributed querys', see "

SQL Server blocks access to component \ 'ad Hoc Distributed Queries \' An error occurred while querying the Excel file in SQL Server:SELECT * from openrowset ('Microsoft. JET. OLEDB.4.0 ', 'excel 8.0; IMEX = 1; HDR = YES; DATABASE = D: \ a.xls', [sheet1 $])Result prompt:SQL Server blocks access to the STATEMENT 'openrowset/OpenDatasource 'of the 'ad Hoc Distribut

, which avoids longer locking of the system tables.25. Avoid using cursors as much as possible, because cursors are inefficient and should be considered for overwriting if the cursor is manipulating more than 10,000 rows of data.26. Before using a cursor-based method or temporal table method, you should first look for a set-based solution to solve the problem, and the set-based approach is generally more efficient.27. As with temporary tables, cursors are not unusable. Using Fast_forward cursors

table, which avoids longer locking of the system tables.25. Avoid using cursors as much as possible, because cursors are inefficient and should be considered for overwriting if the cursor is manipulating more than 10,000 rows of data.26. Before using a cursor-based method or temporal table method, you should first look for a set-based solution to solve the problem, and the set-based approach is generally more efficient.27. As with temporary tables, cursors are not unusable. Using Fast_forward c

Transferred from: http://blog.sqlauthority.com/2010/05/14/sql-server-find-most-expensive-queries-using-dmv/The title of this post was what I can express here for this Quick blog post. I was asked in recent Query tuning consultation project, if I can share my script which I use to figure out which is the M OST expensive queries is running on

, developers can delete objects after they get a list of objects to be deleted, and for each object deletion method, see section 3.4.1. Developers can also do bulk deletions by HQL statements.Eg. The instance deletes the record through the DELETE statement, except that the object LoginName is "Amigo", and the remainder is deleted, as shown in the following code:Java code Session session = Hibernatesessionfactory.getsession (); Transaction ts = null;

virtual memory size to be at least 3 times times the physical memory installed on the computer. Configure the SQL Server max server memory server configuration option to 1.5 times times the physical memory (half of the virtual memory size setting).7. Increase the number of server CPUs, but it is important to understand that parallel processing of serial processing requires resources such as memory. The use of parallel or string travel is the MSSQL au

I'm a lazy man, I just want to do as little as possible. I don't want to be too much when I'm working. Yes, you're right, it looks bad, and as a DBA it's not qualified. But in today's article, I want to show you how you can communicate your work and thinking process to the query optimizer when you want to create an indexed design for a particular query. Sounds interesting? Well, then go into my index tuning world!queries that are problematicLet's look

Today, the unit of an ASP, there is a function is exported data, found an export error, error content is: SQL Server blocked the component'Ad Hoc Distributed Queries'The STATEMENT'Openrowset/opendatasource'Access, because this component has been shut down as part of this server's security configuration. System administrators can enable by using sp_configure'Ad Hoc Distributed Queries'。 About enabling'Ad Hoc

sp_configure '. For more information about enabling 'ad hoc distributed querys', see "peripheral application configurator" in SQL Server books online ". Run the following statements: Exec sp_configure ''ad hoc distributed queries ''' 1 Reconfigure If you have not set the server configuration, the following error may occur: The configuration option 'ad hoc distri