在 SQL Server 中,这通常是通过ALTER TABLE ... SWITCH命令完成的。分区切换的优点是,可以在不移动大量数据的情况下,更改数据的位置。这对于优化资源和时间非常重要。 示例代码: 以下是一个关于如何进行分区切换的简单示例代码: -- 创建一个分区函数CREATEPARTITIONFUNCTIONMyPartitionFunc
建立存档表 建立存档表最简单的方法是选中分好区的活动表,在Storage菜单中选择“Manage Partition”,然后选择“Create a stagin table for partition switching”。建议将“Staging table name”改成固定的没有数字后缀的名字,之后随便选择一个“Switch Parition”,最后生成创建存档表的脚本。 由于指定了待切换的分区,...
Replication Support for Partition Switching Related content Applies to: SQL Server Azure SQL Managed Instance Partitioning makes large tables or indexes more manageable because partitioning enables you to manage and access subsets of data quickly ...
这个非常酷,也非常强大,因为你很容易从中可以跟踪到为什么在线重建索引操作被阻塞。另外,对于分区切换(Partition Switching)也适用同样的技术(锁优先级(Lock Priorities)),因为在切换期间,操作也要在2个表(原表,目标表)上获取架构修改锁(Schema Modification Lock (Sch-M))。 我希望这篇文章可以让你理解SQL Server ...
Partition switching works on columnstore indexes and makes it easy to move a partition of data to another location. Rowgroups are always defined within a table partition. When a columnstore index is partitioned, each partition has its own compressed rowgroups and delta rowgroups. Tip Consider ...
SQL SERVER storage II 存储这块除了表之外,还有很多话题,比如index, Log file, Backup, Error Log等等。当然还包含分布式存储。 Index 的存储在表存储这块其实已经讨论的差不多了。主要的两块还没细讲,一是索引的选取规则,二是索引的碎片。 索引的选取规则,在查询优化这块已经有所涉及,我们一会儿看看是不失有...
For more information, see Partitioned Tables and Indexes, CREATE TABLE (Transact-SQL), CREATE PARTITION SCHEME (Transact-SQL), and CREATE PARTITION FUNCTION (Transact-SQL) in the SQL Server documentation. PostgreSQL Usage Starting with PostgreSQL 10, there is an equiv...
Known issues and errors with change data capture (CDC) in SQL Server and Azure SQL Managed Instance
SQL Server only supports one type of partitioning, which is Range Partitions. More specifically I should say ‘Horizontal Range Partitions’. This the partitioning strategy in which data is partitioned based on the range that the value of a particular field falls in. The other partitioning types...
If you enable partition switching on SQL Server, you might also need split and merge operations in near future. Before executing a split or merge operation on a replicated or CDC enabled table, ensure that the partition in question doesn't have any pending replicated commands. You...