Sql Server 2008 R2 Drop Temporary Table
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I am using the following code to check if the temporary table exists and drop the table if it exists before creating again. It works fine as long as I don't change the columns. If I add a column later, it will give an error saying \"invalid column\". Please let me know what I am doing wrong.
I think the problem is you need to add GO statement in between to separate the execution into batches. As the second drop script i.e. IF OBJECT_ID('tempdb..#Results') IS NOT NULL DROP TABLE #Results did not drop the temp table being part of single batch. Can you please try the below script.
I usually hit this error when I have already created the temp table; the code that checks the SQL statement for errors sees the \"old\" temp table in place and returns a miscount on the number of columns in later statements, as if the temp table was never dropped.
I have always assumed this is because the \"invalid column\" check is done by parser before the query is run, so it is based on the columns in the table before it is dropped..... and that is what pnbs also said.
We get a 'Msg 3726, Level 16, State 1, Line 10 Could not drop object 'schema.table'because it is referenced by a FOREIGN KEY constraint.' Error on [dbo].[customers]and [dbo].[orders] tables but [dbo].[order_items] is dropped. This is because [dbo].[order_items]is the only table without a dependency.
Schema Binding is a method to bind a view, function, or stored procedure to anunderlying table. It prohibits a change to or drop of a table that would affectthe bound object. It requires the bound object(s) to be changed before the tablechange or deletion can happen.
If a table is dropped and there are associated views, stored procedures or functionsthat were created without schema binding, then stored procedures, functions, andviews will still exist but will no longer work. But, what about triggers,indexes, and statistics
To summarize, the view, stored procedure and function that query the table, butare not directly tied to it remain but stop functioning after the table is dropped.And the trigger, index, and statistic that are built on the table are dropped alongwith the table.
Removes one or more table definitions and all data, indexes, triggers, constraints, and permission specifications for those tables. Any view or stored procedure that references the dropped table must be explicitly dropped by using DROP VIEW or DROP PROCEDURE. To report the dependencies on a table, use sys.dm_sql_referencing_entities.
DROP TABLE cannot be used to drop a table that is referenced by a FOREIGN KEY constraint. The referencing FOREIGN KEY constraint or the referencing table must first be dropped. If both the referencing table and the table that holds the primary key are being dropped in the same DROP TABLE statement, the referencing table must be listed first.
Multiple tables can be dropped in any database. If a table being dropped references the primary key of another table that is also being dropped, the referencing table with the foreign key must be listed before the table holding the primary key that is being referenced.
When a table is dropped, rules or defaults on the table lose their binding, and any constraints or triggers associated with the table are automatically dropped. If you re-create a table, you must rebind the appropriate rules and defaults, re-create any triggers, and add all required constraints.
Large tables and indexes that use more than 128 extents are dropped in two separate phases: logical and physical. In the logical phase, the existing allocation units used by the table are marked for deallocation and locked until the transaction commits. In the physical phase, the IAM pages marked for deallocation are physically dropped in batches.
The following example creates a temporary table, tests for its existence, drops it, and tests again for its existence. This example does not use the IF EXISTS syntax which is available beginning with SQL Server 2016 (13.x).
The following example creates a table named T1. Then the second statement drops the table. The third statement performs no action because the table is already deleted, however it does not cause an error.
I want to remove temp tables that I was using in my script in SQL Server 2008. I can't find a way to remove it without writing a few lines of code. I have not been able to find code that works properly. Is there any way to do this without writing code at all If not, what should be my approach Will copying my code in a new script and then creating same name temp tables help
If you use temporary tables, table variables, or table-valued parameters, consider conversions of them to leverage memory-optimized tables and table variables to improve performance. The code changes are usually minimal.
Replacing a global temporary table with a memory-optimized SCHEMA_ONLY table is fairly straightforward. The biggest change is to create the table at deployment time, not at runtime. Creation of memory-optimized tables takes longer than creation of traditional tables, due to the compile-time optimizations. Creating and dropping memory-optimized tables as part of the online workload would impact the performance of the workload, as well as the performance of redo on Always On Availability Group secondaries and database recovery.
The preparations for replacing a session temporary table involve more T-SQL than for the earlier global temporary table scenario. Happily the extra T-SQL does not mean any more effort is needed to accomplish the conversion.
Scope: The TYPE definition created by the first go-delimited batch persists even after the server is shutdown and restarted. But after the first go delimiter, the declared table @tvTableC persists only until the next go is reached and the batch ends.
One of the benefits of materializing data in a temporary table is that it can be more compact than the base data, with preprocessed calculations, and you can index it when it might be inefficient or impractical to index all the base data. In terms of performance, you typically benefit from materializing the data when you need to access it multiple times, but in some cases, even when all you have is a single query against the data, you benefit.
One reason to use a temporary table is to take the load off of a user database when you need to persist temporary data. You can also enjoy the fact that tempdb is treated differently from user databases.
The scope and visibility of a temporary table are very different than they are with both permanent tables and table variables and can be major factors in choosing one type of temporary object over another.
The optimizer creates and maintains distribution statistics (column value histograms) for temporary tables and keeps track of their cardinality, much as it does for permanent ones. This capability is especially important when you index the temporary table. Distribution information is available to the optimizer when it needs to estimate selectivity, and you will get optimized plans that were generated based on this information. This is one of the main areas in which temporary tables differ from table variables in terms of performance.
When a batch is resolved, the schema of a temporary table that is created within that batch is not available. So resolution of code that refers to the temporary table is deferred to run time. However, if a temporary table name you refer to already exists within the session (for example, it has been created by a higher level in the call stack), that table name will resolve to the existing temporary table. However, the code will always run against the innermost temporary table with the referenced name.
Remember that a local temporary table created in a certain level is not visible to outer levels in the call stack. Occasionally, programmers look for ways around this limitation, especially when working with dynamic execution. That is, you want to construct the schema of the temporary table dynamically and populate it based on some user input, and then access it from an outer level. Frankly, insisting on using local temporary tables in such a scenario is very problematic. The solution involves ugly code, as is the nature of dynamic SQL in general, plus recompilations resulting from schema changes and data modifications. You should consider other alternatives to provide for the original need. Still, I want to show you a way around the limitations.
SQL Server 2008 supports the caching of temporary objects across repeated calls of routines. This feature is applicable to local temporary tables, table variables, and table-valued functions used within routines such as stored procedures, triggers, and user-defined functions. When the routine finishes, SQL Server keeps the catalog entry. If the object is smaller than 8 MB, SQL Server keeps one data page and one IAM page, and uses those instead of allocating new ones when the object is created again. If the object is larger than 8 MB, SQL Server uses deferred drop, and immediately returns control to the application. This feature results in reduction of contention against system catalog tables and allocation pages, and in faster creating and dropping of temporary objects.
As a workaround, you can include an unnamed UNIQUE or PRIMARY KEY constraint as part of the temporary table definition. The constraint implicitly creates a unique index on the constraint keys. Run the following code to test this approach:
As for named constraints, you might find this restriction odd, but naming a constraint prevents SQL Server from caching your temporary objects. You just saw in the last example that when the UNIQUE constraint was not named, SQL Server cached the temporary table. Now try the same example, but this time name the constraint:
In one special case you might want to have a global temporary table available but not owned by any session. In this case, it will always exist, regardless of which sessions are open or closed, and eliminated only if someone explicitly drops it. To achieve this, you create the table within a procedure, and mark the stored procedure with the startup procedure option. SQL Server invokes a startup procedure every time it starts. Furthermore, SQL Server always maintains a reference counter greater than zero for a global temporary table created within a startup procedure. This ensures that SQL Server will not attempt to drop it automatically. 153554b96e
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