Besides the default durable memory-optimized tables, SQL Server also supports non-durable memory-optimized tables, which aren't logged and their data isn't persisted on disk. This means that transactions on these tables don't require any disk IO, but the data is lost if there is a serv...
Row-Level Security in Memory-Optimized Tables Scenarios See Also Applies to: SQL Server Azure SQL Database Azure SQL Managed Instance Memory-optimized tables are created using CREATE TABLE (Transact-SQL). Memory-optimized tables are fully durable by default, and, like transactions on (traditional...
SQL Server maintains the row count for disk-based tables. Estimates for full table and index scans are always accurate. The estimate for the join is fairly accurate, too.If these estimates change, the cost considerations for different plan alternatives change as well. Fo...
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.
Applies to: SQL Server Azure SQL Database Azure SQL Managed InstanceAll memory-optimized tables must have at least one index, because it is the indexes that connect the rows together. On a memory-optimized table, every index is also memory-optimized. There are several ways in which an...
Applies to:SQL Server In-Memory OLTP provides full durability for memory-optimized tables. When a transaction that changed a memory-optimized table commits, SQL Server (as it does for disk-based tables), guarantees that the changes are permanent (will survive a database restart), provided the ...
If you map a database with memory-optimized tables and a SQL Server workload to the same resource pool, the Resource Governor sets an internal threshold for In-Memory OLTP use so that the users of the pool do not have conflicts over pool usage. Generally speaking, the threshold for In-Me...
SQL Server 2014 CTP1 introduced hash indexes for memory-optimized tables. Hash indexes are very efficient for point lookups, when you know exactly the value you are looking for. However, they do not perform well if you need a range of value, for example a da...
A computer with enough memory to hold the data in memory-optimized tables. Memory-optimized data must not use more than 80% of the maximum server memory. 也就是不要超过整个INSTANCE内存的80%,但是数据库的增长有时候是无法预料的啊。下面开始我的测试: ...
This chapter discusses memory-optimized tables in detail. It shows how memory-optimized tables store their data and how SQL Server accesses them. It covers the format of the data rows in memory-optimized tables and talks about the process of native compilation.Dmitri Korotkevitch...