Create the dbo.soGlobalB table, one time, just as you would any traditional on-disk table.The conversion from global temporary to SCHEMA_ONLY is the following steps: CREATE TABLE dbo.soGlobalBĬolumn1 INT NOT NULL INDEX ix1 NONCLUSTERED, CREATE TABLE #tempGlobalBĬonsider replacing the global temporary table with the following memory-optimized table that has DURABILITY = SCHEMA_ONLY. Suppose you have the following global temporary table. 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. Creation of memory-optimized tables takes longer than creation of traditional tables, due to the compile-time optimizations. The biggest change is to create the table at deployment time, not at runtime. Replacing a global temporary table with a memory-optimized SCHEMA_ONLY table is fairly straightforward. Must be declared in two steps (rather than inline):.In-Memory OLTP provides the following objects that can be used for memory-optimizing temp tables and table variables: For details see Indexes for Memory-Optimized Tables. For a hash index, the bucket count should ideally be 1-2 times the number of expected unique index keys, but overestimating bucket count is usually fine (up to 10X).Must have at least one index, either hash or nonclustered.Can be passed into a stored proc as a table-valued parameter (TVP).Involves no tempdb utilization or contention.Is stored only in memory, and has no component on disk.The efficiency is maximized when the table variable is accessed from within a natively compiled module.
Basics of memory-optimized table variablesĪ memory-optimized table variable provides great efficiency by using the same memory-optimized algorithm and data structures that are used by memory-optimized tables.
A code sample that highlights the performance benefits of memory-optimizationĪ.Prerequisites before conversion to In-Memory.Technical steps for implementing the conversions to In-Memory.Scenarios which argue in favor of conversion to In-Memory.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.