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SQL FOREIGN KEY Constraint
The FOREIGN KEY constraint also prevents invalid data from being inserted into the foreign key column, because it has to be one of the values contained in the table it points to
Tips on Optimizing SQL Server Clustered Indexes - SQL Server Performance
But if a heap is used, even if you add a non-clustered index on an appropriate column or columns, because the data is not physically ordered (unless you are using a covering index), SQL Server has to read the data from disk randomly using 8K pages. But if a table is subject to few data modification, but to many SELECT statements, then this advice is less useful, and other options for taking full advantage of the clustered index should be considered
SQL Server Forums - Auto create History Tables and Triggers
The NonClustered was to allow for easily adding a clustered key (without having to drop one first) to support what ever queries are built to leverage the Audit table later in the development process. Extending it to 8000 resolved that issue but would still pose problems with tables that contain a very large number of columns, especially if the column names are lengthy
Angie Reply shaunmacrae Says: November 17, 2011 at 8:07 pm You can also incorporate parameters into your query when using the query designer (rather than manually writing sql code) in the applied filters section. In the Default Values we can pick or set a value to be the default, and the Advanced lets us determine how often we need to refresh the source data for our parameter
DTS used to be able to handle this perfectly well and so did the Microsoft ISAM Jet driver (importing with SQL Sever 2000, SQL Server 7, MS Access or MS Excel up to v.2007 works). i need to find difference for uniqueID in Hours between two dates(where most of the time two dates can be the same date or different), and am using DATEDIFF function
SQLServerCentral.com
58 731 Wednesday, April 8, 2015 4:39 AM In: RE: Movie Rental Database By Grant Fritchey Hardware Discussions about SQL Server hardware and sizing your servers. 614 2,213 Wednesday, February 25, 2015 10:46 PM In: RE: Project Plan By Sachin Butala-182900 Working with Oracle Questions and comments about configuring, connecting to and troubleshooting SQL Server 7 or 2000 to Oracle databases
t sql - SQL Server 2008 merge statement deadlocking itself - Database Administrators Stack Exchange
Redefining the TYPE of the table variable to include a clustered PRIMARY KEY: DROP TYPE dbo.CoUserData; CREATE TYPE dbo.CoUserData AS TABLE ( MyKey integer NOT NULL PRIMARY KEY CLUSTERED, MyValue integer NOT NULL ); The execution plan now shows a scan of the clustered index and the uniqueness guarantee means the optimizer is able to safely remove the Table Spool: In tests with 5000 iterations of the MERGE statement on 128 threads, no deadlocks occurred with the clustered table variable. I should stress that this is only on the basis of observation; the clustered table variable could also (technically) produce its rows in a variety of orders, but the chances of a consistent order are very greatly enhanced
Is there a query to retrieve the partition ranges? In my example I am expecting to see the list of current partition ranges like Jan2011, Feb2011 Thanks. USE TestDB; GO --- Step 6 : Insert Data in Partitioned Table INSERT INTO TestTable (ID, Date) -- Inserted in Partition 1 VALUES (1,GETDATE()); INSERT INTO TestTable (ID, Date) -- Inserted in Partition 2 VALUES (11,GETDATE()); INSERT INTO TestTable (ID, Date) -- Inserted in Partition 2 VALUES (12,GETDATE()); GO Step 7 : Test Data from TestTable Query TestTable and see the values inserted in TestTable
Tips on Optimizing SQL Server Composite Indexes - SQL Server Performance
SQL Server has the ability to join two or more individual indexes and intersect them, just as if you were using a composite index, giving you the best benefits of single and composite indexes. This is because you always want to use the most selective columns at the left of the key to ensure that the composite index is selective enough to be used by the Query Optimizer
Regards, Nitin Reply Vinayak says: July 31, 2014 at 2:58 pm Good one Nitin,very easy to understand the difference between Primary Key and Composite Primary Key. Reply CoDevil says: December 20, 2014 at 12:34 pm A foreign key can be defined to reference a column of a unique constraint of another table @Eshwar V Reply Mohan Pawar says: December 26, 2014 at 3:56 pm Hi easwar, Correct me if m wrong, as per i know Foreign keys can reference Unique Keys not the Primary Key
Craig Freedman 5 Jan 2009 4:08 PM With regards to seek or scan performance, the question to ask is whether there is a predicate on the partition column that can be used to enable partition elimination. Craig Freedman's SQL Server Blog 22 Aug 2008 6:50 PM In this post on partitioned tables, I mentioned that SQL Server 2008 has a much more efficient implementation Craig Freedman 22 Aug 2008 6:52 PM I decided to measure the overhead of dynamic partition elimination with a large number of partitions
The compile time table cardinality is stored in the plan and if the statement is executed again with the same cardinality (either due to flow of control statements or reuse of a cached plan) no recompile occurs. As a side bar, recompiles with Temp Tables can occur with the addition of data and whether the DDL for the temp table is interlaced with the DML or not
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