c# print barcode labels Inside Microsoft SQL Server 2008: T-SQL Programming in .NET framework

Painting Quick Response Code in .NET framework Inside Microsoft SQL Server 2008: T-SQL Programming

Inside Microsoft SQL Server 2008: T-SQL Programming
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referenced_schema_name AS tgtschema, referenced_id AS tgtobjid, referenced_entity_name AS tgtobjname, referenced_minor_id AS tgtminorid FROM sys.sql_expression_dependencies;
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You get the following output:
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srcobjschema ------------dbo dbo dbo dbo srcobjname ----------Proc1 Proc2 V1 V2 srcminorid ----------0 0 0 0 tgtschema ---------dbo dbo dbo dbo tgtobjid ----------2098106515 NULL 2098106515 2098106515 tgtobjname ----------T1 T3 T1 T1 tgtminorid ----------0 0 0 0
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Observe that you got only dependency information for references that appear in static code . The reference in Proc1 to T2 in the dynamic SQL code wasn t recorded . Also observe that for referenced objects that exist (for example, T1) you get both name and ID information, but for objects that don t exist (for example, T3) you get only name information . For objects that exist, you get the object ID even if the dependency was established before the object existed the ID is effectively filled in when known . If you attempt to run code that refers to a nonexistent object, you get a Level 16 resolution error . If you want to know which objects a certain object depends on, query the sys.dm_sql_ referenced_entities function and provide the referencing object name as the first input and OBJECT as the second input, like so:
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SELECT referenced_schema_name AS objschema, referenced_entity_name AS objname, referenced_minor_name AS minorname, referenced_class_desc AS class FROM sys.dm_sql_referenced_entities('dbo.Proc1', 'OBJECT');
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You get the following output, indicating that Proc1 depends on the table T1 and on the column col1 within T1:
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objschema ---------dbo dbo objname -------T1 T1 minorname ---------NULL col1 class ----------------OBJECT_OR_COLUMN OBJECT_OR_COLUMN
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If you want to know which objects depend on a certain object for example before dropping an object query the sys.dm_sql_referencing_entities function and provide the referenced object name as the first input and OBJECT as the second input, like so:
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SELECT referencing_schema_name AS objschema, referencing_entity_name AS objname, referencing_class_desc AS class FROM sys.dm_sql_referencing_entities('dbo.T1', 'OBJECT');
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3 Stored Procedures
This generates the following output indicating that Proc1, V1, and V2 depend on T1:
objschema ---------dbo dbo dbo objname -------Proc1 V1 V2 class ----------------OBJECT_OR_COLUMN OBJECT_OR_COLUMN OBJECT_OR_COLUMN
Important These objects contain a bit less than full dependency information they give you
information about references by name (with some exceptions, such as references to temporary tables) . If there s an indirect dependency (e .g ., Proc3 calls Proc1, and Proc1 references T1 by name), the simple calls to these objects won t reveal it (here, Proc3 depends on T1) . However, an indirect dependency like this may be just as important to know about as a direct named reference . If you want to know what will be affected when you drop an object, for example, you have to follow the dependencies yourself . The good news is that in SQL Server 2008, you can .
When you re done experimenting with object dependency information run the following code for cleanup:
IF IF IF IF IF OBJECT_ID('dbo.Proc1', 'P') OBJECT_ID('dbo.V1', 'V') IS OBJECT_ID('dbo.V2', 'V') IS OBJECT_ID('dbo.T1', 'U') IS OBJECT_ID('dbo.T2', 'U') IS IS NOT NULL DROP PROC dbo.Proc1; NOT NULL DROP VIEW dbo.V1; NOT NULL DROP VIEW dbo.V2; NOT NULL DROP TABLE dbo.T1; NOT NULL DROP TABLE dbo.T2;
Compilations, Recompilations, and Reuse of execution Plans
Earlier I mentioned that when you create a stored procedure, SQL Server parses your code and then attempts to resolve it . If resolution was deferred, it will take place at first invocation . Upon first invocation of the stored procedure, if the resolution phase finished successfully, SQL Server analyzes and optimizes the queries within the stored procedure and generates an execution plan . An execution plan holds the instructions to process the query . These instructions include which order to access the tables in; which indexes, access methods, and join algorithms to use; whether to spool interim sets; and so on . SQL Server typically generates multiple permutations of execution plans and will choose the one with the lowest cost out of the ones that it generated . Note that SQL Server won t necessarily create all possible permutations of execution plans; if it did, the optimization phase might take too long . SQL Server limits the optimizer by calculating a threshold for optimization based on the sizes of the tables involved as well as other factors . Stored procedures can reuse a previously cached execution plan, thereby saving the resources involved in generating a new execution plan . This section will discuss the reuse of execution plans, cases when a plan cannot be reused, parameter and variable sniffing issues, and plan guides .
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