clustered-index

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MySQL compound index not being used

I have a large table from which I must select large amounts of rows. The table stores call detail records (CDR\'s). Example:[详细]

2023-02-02 18:21 分类：问答
Table index design

I would like to add index(s) to my table开发者_运维问答. I am looking for general ideas how to add more indexes to a table.[详细]

2023-02-01 00:25 分类：问答
SQL Server "Write Once" Table Clustered Index

I have a fairly unique table in a SQL Server database that doesn\'t follow \'typical\' usage conventions and am looking for some advice regarding the clustered index.[详细]

2023-01-28 16:13 分类：问答
Do clustered indexes have to be unique?

What happens if a clustered index is not unique? Can it lead to bad performance because inserted rows flow to an "overflow"开发者_如何学编程 page of some sorts?[详细]

2023-01-28 03:52 分类：问答
Sql Server 2005 novice query

I am very beginner in SQL Server 2005 and I am learning it from online tutorial, here is some of my question:[详细]

2023-01-26 12:37 分类：问答
How can I speed up this SQL query?

I\'m fairly new to SQL, and I\'m trying to work out how to speed up a complex SQL query in postgres, perhaps by improving my use of indexes. This is the query:[详细]

2023-01-23 12:51 分类：问答
Reasons not to have a clustered index in SQL Server 2005

I\'ve inherited some database creation scripts for a SQL SERVER 2005 database. One thing I\'ve noticed is that all primary keys are created as NON CLUSTERED indexes as opposed to clustered.[详细]

2023-01-22 09:32 分类：问答
Why/when/how is whole clustered index scan chosen rather than full table scan?

IMO, please correct me... the leaf of clustered index contains the real table row, so full clustered index, with intermediate leaves, contain much more data than the full table(?)[详细]

2023-01-20 16:28 分类：问答
H2 database: Information about primary key in INFORMATION_SCHEMA

I create the following table in H2: CREATE TABLE TEST (ID BIGINT NOT NULL PRIMARY KEY) Then I look into INFORMATION_SCHEMA.TABLES table:[详细]

2023-01-19 02:12 分类：问答
Does non-unique clustering key increase likelyhood of page level locks?

I have a table with many columns of which the total max size greatly exceeds the 8k boundary. This table contains a ModuleID column which basically tells u what type of object it is (dont worry - I di[详细]

2023-01-18 06:58 分类：问答