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 indexes on a table are termed non-clustered. SQL Server Index Basics SQL Server Indexes: The Basics SQL Server Indexes Index Basics Index (wiki)

2014年3月9日 · Indexes are a balancing act, every index you add usually will add time to data inserts, updates and deletes but can potentially speed up selects and joins in complex inserts, updates and deletes. There is no one formula for what are the best indexes although the rule of thumb above is a good place to start.

Given that indexing is so important as your data set increases in size, can someone explain how indexing works at a database-agnostic level? For information on queries to index a field, check out ...

2009年4月20日 · None of the above did the job for me, but this does: -- KDF9's concise index list for SQL Server 2005+ (see below for 2000) -- includes schemas and primary keys, in easy to read format -- with unique, clustered, and all ascending/descendings in a single column -- Needs simple manual add or delete to change maximum number of key columns

Use indexes on tables with numerous rows, on columns that are used in the WHERE clause of queries or in table joins, and on columns used in ORDER BY and GROUP BY queries. Avoid infrequently used indexes on frequently updated columns. In addition, avoid having many indexes on a table that is frequently updated.

2012年8月16日 · When should I use index on table? From how many rows index makes sense? If I have table with constant rows, just edited come columns (not in 'where' clause), makes index sense even if table has just

I've created composite indexes (indices for you mathematical folk) on tables before with an assumption of how they worked. I was just curious if my assumption is correct or not. I assume that when...

2011年3月6日 · SHOW INDEXES FROM database_name.table_name; Note that INDEX and KEYS are the synonyms of the INDEXES, IN is the synonym of the FROM, therefore, you can use these synonyms in the SHOW INDEXES column instead.

Indexes in SQL Server 2005/2008 – Part 2 – Internals One thing to note, clustered indexes should have a unique key (an identity column I would recommend) as the first column.

2010年4月22日 · For SQL 2008 and newer, a more concise method, coding-wise, to detect index existence is by using the INDEXPROPERTY built-in function: INDEXPROPERTY ( object_ID , index_or_statistics_name , property )