indexing - What is an index in SQL? - Stack Overflow
2010年6月2日 · In SQL Server, a clustered index determines the physical order of data in a table. There can be only one clustered index per table (the clustered index IS the table). All other …
How can I quickly detect and resolve SQL Server Index …
2017年4月28日 · To check the fragmentation percentage on a table. SELECT a.index_id, NAME, avg_fragmentation_in_percent, fragment_count, avg_fragment_size_in_pages FROM …
sql server - How do you check if a certain index exists in a table ...
2010年4月22日 · Something like this: SELECT * FROM INFORMATION_SCHEMA.TABLE_CONSTRAINTS WHERE CONSTRAINT_NAME …
sql - Creating an index on a table variable - Stack Overflow
2009年5月20日 · The question is tagged SQL Server 2000 but for the benefit of people developing on the latest version I'll address that first. SQL Server 2014. In addition to the …
List of all index & index columns in SQL Server DB
2009年4月20日 · Just note that if you are going to use any of the working queries in the answers here to script your indexes, you need to incorporate filter_definition column from sys.indexes …
sql - What are the different types of indexes, what are the benefits …
DML on tables with bitmap indexes can cause serious lock contention. On the other hand, the Oracle CBO can easily combine multiple bitmap indexes together, and bitmap indexes can be …
sql server - Script for rebuilding and reindexing the fragmented …
Reorganise all indexes for a table. ALTER INDEX ALL ON XXXMYTABLEXXX REORGANIZE Reorganise one specified index for a table. ALTER INDEX XXXMYINDEXXXX ON …
sql - How does database indexing work? - Stack Overflow
the second database - to which mirroring or replicating is done, the slave - would experience all the data manipulation as the first one does. with each dml-operation the indexes on that …
sql - What are indexes and how can I use them to optimize queries …
2014年3月9日 · As previously stated, you can have a clustered index and multiple non-clustered indexes. In SQL 2005, you can also add additional columns to a non-clustered index, which …
sql - How to use index in select statement? - Stack Overflow
2011年7月6日 · For traditional SQL Server, the filters you define in your 'Where' clause should persuade the engine to use any relevant indices... Provided the engine's execution plan can …