SQLServer的查询优化器总是尝试找到最佳的执行计划,有时候虽然你建立了索引视图,但优化器依然使用了原始表上的索引,此时你可以使用 WITH NOEXPAND 来强制使用索引视图上的索引(而不是原始表上的索引)。 索引视图在SQLServer2012 的各个版本上都有支持,在开发版或企业版中查询处理器甚至能以此来把匹配索引视图的查询都...
三:性能简述(Performance) 1. Index碎片 1.1 查询碎片 sys.dm_db_index_physical_stats可以用来检测特定索引、表或索引视图的所有索引、数据库中所有索引或所有数据库中所有索引中的碎片。 重要栏位: 1.2. 重建索引与重组索引(rebuild and reorganize) 无论何时对基础数 据执行插入、更新或删除操作,SQL Server 数据...
SQLServer的查询优化器总是尝试找到最佳的执行计划,有时候虽然你建立了索引视图,但优化器依然使用了原始表上的索引,此时你可以使用 WITH NOEXPAND 来强制使用索引视图上的索引(而不是原始表上的索引)。 索引视图在SQLServer2012 的各个版本上都有支持,在开发版或企业版中查询处理器甚至能以此来把匹配索引视图的查询都...
One of the key areas to investigate during performance optimization is the indexing strategy. Not building the right index based on the read pattern may be disastrous specially when databases are big. In this article, I will cover a scenario around how SQL Server scans an index while r...
It's common for PFE's to get involved with performance tuning issues, and for SQL Server, indexes are a critical part of maximum performance. I recently ran into a performance problem that was due entirely to the statistics being outdated on an index, so I refreshed my memory a bit about...
Doing so might cause degraded performance or excessive memory consumption during these operations. Microsoft recommends using only aligned indexes when the number of partitions exceeds 1,000. partition_number The partition number of a partitioned index that is to be rebuilt or reorganized. partition_...
Doing so might cause degraded performance or excessive memory consumption during these operations. Microsoft recommends using only aligned indexes when the number of partitions exceeds 1,000. partition_number The partition number of a partitioned index that is to be rebuilt or reorganized. partition_...
SQL Server Smart Backup to Multiple Files Are you backing up to multiple files to improve backup performance? Are you running into the size limitations, when backing up to Azure Blob Storage? I have had the option to backup to to multiple files for a long time. The challange has just been...
Performance is a big deal and this was the opening line in an article that was written onHow to optimize SQL Server query performance. The initial article shows not only how to design queries with the performance in mind, but also shows how to find slow performance queries and how t...
How can I find duplicate indexes in SQL Server? How does index analysis work in SQL Sentry? Monitoring your SQL Server index usage and taking the time to find unused indexes in SQL Server can enable you to take charge of your SQL Server performance, organization, and resource allocation, whi...