In-Memory OLTP is integrated with SQL Server to provide a seamless experience in all areas such as development, deployment, manageability, and supportability. A database can contain in-memory as well as disk-based objects. Rows in memory-optimized tables are versioned. This means that each r...
SQL Server 2014 (12.x) and SQL Server 2016 (13.x) have a limit of 8 indexes per memory-optimized table or table type. Starting with SQL Server 2017 (14.x) and in Azure SQL Database, there is no longer a limit on the number of indexes specific to memory-optimized tables and...
Applies to: SQL Server Azure SQL Database Azure SQL Managed Instance Memory-optimized tables require that sufficient memory exist to keep all of the rows and indexes in memory. Because memory is a finite resource, it's important that you understand and manage memory usage on your system. The...
Applies to: SQL Server Azure SQL Database Azure SQL Managed Instance Schema and index changes on memory-optimized tables can be performed by using the ALTER TABLE statement. In SQL Server 2016 and Azure SQL Database ALTER TABLE operations on memory-optimized tables are OFFLINE, meaning that the...
Memory-optimized tables are created using CREATE TABLE (Transact-SQL).Memory-optimized tables are fully durable by default, and, like transactions on (traditional) disk-based tables, transactions on memory-optimized tables are fully atomic, consistent, isolated, and durable (ACID). Memory-optimized ...
Interpreted Transact-SQL access to memory-optimized tables is referred to as interop access. Starting with SQL Server 2016 (13.x), queries in interpreted Transact-SQL can scan memory-optimized tables in parallel, instead of just in serial mode. Memory-optimized table...
Applies to: SQL Server Azure SQL Database Azure SQL Managed InstanceThere are two durability options for memory-optimized tables:SCHEMA_AND_DATA (default) This option provides durability of both schema and data. The level of data durability depends on whether you commit a transaction...
首先Sql Server将checkpoint file inventory发送给Hekaton,然后Hekaton解析需要加载的data file和delta file,由于这两个文件一一对应,所以Hekaton可以并行的去加载。然后并行的将data file的记录进行插入。最后当记载完成后,重放检查点之后的事务日志。 GARBAGE COLLECTION ...
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: ...