The primary storage for memory-optimized tables is the main memory. Rows in the table are read from and written to memory. A second copy of the table data is maintained on disk, but only for durability purposes. SeeCreating and Managing Storage for Memory-Optimized Objectsfor more informati...
On a memory-optimized table, every index is also memory-optimized. There are several ways in which an index on a memory-optimized table differs from a traditional index on a disk-base table:Data rows are not stored on pages, so there is no collection of pages or extents, no parti...
2. 添加内存优化数据文件组 为这个数据库添加一个内存优化数据(MEMORY_OPTIMIZED_DATA)文件组,从而启用了内存优化数据的功能。每个数据库只能有一个内存优化数据文件组。 2.1 SSMS方式 2.2 T-SQL方式 ALTER DATABASE [MOTDB] ADD FILEGROUP [MOT_FileGroup] CONTAINS MEMORY_OPTIMIZED_DATA 1. 2. 3. 3. 添加Fil...
官网:https://docs.microsoft.com/zh-cn/sql/relational-databases/in-memory-oltp/survey-of-initial-areas-in-in-memory-oltp?view=sql-server-ver15 【1.0】使用大概步骤与限制 步骤: (1)创建数据库和MEMORY_OPTIMIZED_DATA文件组(alter database add filegroup,每个数据库只能有一个MEMORY_OPTIMIZED_DATA文件组...
ALTER DATABASE imoltp ADD FILE ( name='imoltp_mod1', filename='c:\data\imoltp_mod1') TO FILEGROUP imoltp_mod; ALTER DATABASE imoltp SET MEMORY_OPTIMIZED_ELEVATE_TO_SNAPSHOT = ON; GO USE imoltp GO -- Create a durable (data will be persisted) memory-optimized table -- two of th...
Starting with SQL Server 2016 (13.x), there's no limit on the size of memory-optimized tables, though the tables do need to fit in memory. In SQL Server 2014 (12.x) the supported data size is 256 GB for SCHEMA_AND_DATA tables. The size of a memory-optimized table corresponds to ...
The memory-optimized table must have aPRIMARY KEYindex. IfHASHindex is selected for the primary key, thenBUCKET_COUNTmust be specified. 在内存优化表中只允许包括主键在内的8个索引 IDENTITYproperties have to be set as seed = 1 and increment = 1 only. ...
官网:https://docs.microsoft.com/zh-cn/sql/relational-databases/in-memory-oltp/introduction-to-memory-optimized-tables?view=sql-server-ver15 内存优化表是使用CREATE TABLE (Transact-SQL)创建而成的表。 默认情况下,内存优化表具有完全持久性。与(传统)基于磁盘的表上的事务一样,内存优化表上的事务具有完全...
Learn how the query optimizer uses statistics about columns in memory-optimized tables to create query plans that improve query performance for In-Memory OLTP.
At most 8 indexes – you cannot specify more than 8 indexes on a single memory-optimized table. BIN2 collations – when using n(var)char columns in an index key, the columns must have a _BIN2 collation. Using BIN2 allows very fast lookup, as this ...