Starting in SQL Server 2016, the query plan for a memory-optimized table can scan the table in parallel. This improves the performance of analytical queries. Hash indexes also became scannable in parallel in SQL Server 2016. Nonclustered indexes also became scannable in parallel in SQL Server ...
1You can't access a memory-optimized table or natively compiled stored procedure from the context connection (the connection from SQL Server when executing a CLR module). You can, however, create and open another connection from which you can access memory-optimized tables and natively compiled...
SQL Copy CREATE TABLE SupportEvent ( SupportEventId int NOT NULL PRIMARY KEY NONCLUSTERED, ... ) WITH ( MEMORY_OPTIMIZED = ON, DURABILITY = SCHEMA_AND_DATA); Note SQL Server 2014 (12.x) and SQL Server 2016 (13.x) have a limit of 8 indexes per memory-optimized table or tab...
Starting in SQL Server 2016, the query plan for a memory-optimized table can scan the table in parallel. This improves the performance of analytical queries. Hash indexes also became scannable in parallel in SQL Server 2016. Nonclustered indexes also became scannable in parallel in SQL Server ...
Create a memory-optimized data filegroup and add a container to the filegroup. Create memory-optimized tables and indexes. For more information, see CREATE TABLE (Transact-SQL). Load data into the memory-optimized table and update statistics after loading the data and before creating the compiled...
Before SQL Server 2016 (13.x), the in-row data size of a memory-optimized table couldn't be longer than 8,060 bytes. However, starting with SQL Server 2016 (13.x), and in Azure SQL Database, you can create a memory-optimized table with multiple large columns (for...
Table Hints See Also Applies to: SQL Server Azure SQL Database Azure Synapse Analytics Analytics Platform System (PDW) With only a few exceptions, you can access memory-optimized tables using any Transact-SQL query or DML operation (select, insert, update, or de...
Hekaton支持hash index和range index,前者由lock-free的hash table实现,后者由Bw-tree实现。Hekaton的存储只有插入和删除两种操作,更新由删除和插入组成。 上图简单的展示了Hekaton的record和index的组织方式。每条record由三部分组成,分别是Header、Links和Payload。Payload存储真实存在的数据(上图展示的存在Name、City、Amo...
SQL Server 2014引入了内存数据库,这是个非常好的功能。数据可以直接在内存中,这样可以直接对内存进行操作,性能有很大的提高。 今天想到一个问题,如果表增长的大了,而数据库内存不够会出现什么样的情况。因为微软的MSDNS上是这样写的额: A computer with enough memory to hold the data in memory-optimized tab...
内存优化表(Memory-Optimized Table,简称MOT)使用乐观策略(optimistic approach)实现事务的并发控制,在读取MOT时,使用多行版本化(Multi-Row versioning)创建数据快照,读操作不会对数据加锁,因此,读写操作不会相互阻塞。写操作会申请行级锁,如果两个事务尝试更新同一数据行,SQL Server检测到写-写冲突,产生错误(Error ...