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How to optimize large SQL Server inserts, updates and deletes?
These are the IO results: Table ‘MyTestTable’. Scan count 1, logical reads 65415, physical reads 2, read-ahead reads 65398, lob logical reads 0, lob physical reads 0, lob read-ahead reads 0. The SELECT took 1:08 minutes and retrieved 2,395,317 rows. For the same SELECT we implement the following process to do it in batches:
How to create a memory optimized temp table?
From your Transact-SQL, remove the create of the ##tempGlobalB table. It is important to create the memory-optimized table at deployment time, not at runtime, to avoid the compilation overhead that comes with table creation. In your T-SQL, replace all mentions of ##tempGlobalB with dbo.soGlobalB.
How to memory optimize a table in SQL Server?
Enhance the explicit TYPE creation to be the following, which adds: An index. Again, each memory-optimized table must have at least one index. MEMORY_OPTIMIZED = ON. Done. On Microsoft SQL Server, to use memory-optimized features, your database must have a FILEGROUP that is declared with MEMORY_OPTIMIZED_DATA.
How to optimize SQL Server insert and delete processes?
DBCC DROPCLEANBUFFERS SET STATISTICS IO ON DECLARE @id_control INT DECLARE @batchSize INT DECLARE @results INT SET @results = 1 SET @batchSize = 100000 SET @id_control = 0 WHILE (@results > 0) BEGIN — put your custom code here SELECT * FROM [dbo].
How to improve the performance of an insert?
One of the most common ways to improve the performance of an INSERT operation is to use the APPEND optimizer hint. APPEND forces the optimizer to perform a direct path INSERT and appends new values above the high water mark (the end of the table) while new blocks are being allocated.
How does append improve the performance of the INSERT statement?
APPEND forces the optimizer to perform a direct path INSERT and appends new values above the high water mark (the end of the table) while new blocks are being allocated. This is instead of the default process whereby holes in your blocks are filled with free space. In other words, APPEND enhances the performance of the INSERT statement.
How does TSQL speed up performance of insert?
This prevents page splits (where SQL Server must move data around because an existing page is full) Set the fill factor to 0 or 100 (they are equivalent) so that no space in the table is left empty, reducing the number of pages that the data is spread across.