database-indexes

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What columns to index on to make this query faster?

SELECT t.compname, min(t2.version) FROM archdetails t INNER JOIN svn3 b ON t.compname = b.compname INNER JOIN archdetails t2 ON t.compname = t2.compname[详细]

2023-01-23 04:22 分类：问答
multiple unique keys in nhibernate

I need constr开发者_StackOverflow中文版aints created in the following manner: CONSTRAINT [IX_Unique_1] UNIQUE NONCLUSTERED[详细]

2023-01-22 13:40 分类：问答
databases with flexible indexes?

form wikipedia:http://en.wikipedia.org/wiki/Index_(database) Some databases extend the power of indexing by allowing indexes to be created on functions or expressions. For example, an index could be[详细]

2023-01-13 20:21 分类：问答
HibernateToolTask (hbm2hbmxml) doesn't generate index in hibernate-mapping from @org.hibernate.annotations.Index annotations

I am trying to generate hibernate-mapping from POJOs with hibernate annotations. Then I want to use liquibase to generate database schema.[详细]

2023-01-12 22:43 分类：问答
index 'enabled' fields good idea?

Content of a website is stored in a MySQL database. 99% of the 开发者_高级运维content will be enabled, but some (users, posts etc.) will be disabled. Most of the queries end as WHERE (...) AND enabled[详细]

2023-01-01 04:54 分类：问答
Google App Engine Database Index

I need to store a undirected graph in a Google App Engine database. For optimization purposes, I am thinking to use database indexes.[详细]

2022-12-31 11:17 分类：问答
A list of indices in MongoDB?

Is there a way to see a list of indices on a collection in mongodb in shell?i read through http://www.mongodb.org/display/DOCS/Indexes but i dont 开发者_如何转开发see anythingFrom the shell:[详细]

2022-12-29 06:52 分类：问答
How can I speed up queries against tables I cannot add indexes to?

I access several tables remotely via DB Link.They are very normalized and the data in each is effective-dated.Of the millions of records 开发者_StackOverflow社区in each table, only a subset of ~50k ar[详细]

2022-12-23 17:00 分类：问答
Advantage of BTREE?

I create indexes without the USING BTREE clause. Is there any advantage of using BTREE开发者_运维技巧 index?[详细]

2022-12-11 05:19 分类：问答