indexing

相关标签：javascript jquery android 多少钱 iPhone

MySQL - do indexes get dropped when table is dropped?

In MySQL do indexes get automatically deleted when th开发者_Python百科e table is dropped? Is it true for other databases as well like Postgres?yes it is deleted automatically to check it you can do fo[详细]

2023-04-12 04:34 分类：问答
What's the difference between an inverted index and a plain old index?

In software engineering we create indexes all the time (e.g., in databases) but I also hear a lot of people talk about inverted indices. Is there som开发者_开发百科ething fundamentally different betwe[详细]

2023-04-12 01:05 分类：问答
Using a result to index a data.frame

I have adata.frame named pp that looks like this: > head(pp) X02RX03NX04KX04NX04RX06IX06NX08JX08PX09OX11O[详细]

2023-04-11 20:20 分类：问答
SQL Server: 12% index scan density and 50% fragmentation. How bad is "bad"?

How much fragmentation is bad? How low of scan density is too low? How low does scan density is bad? i have a table with the following index density and fragmentation levels:[详细]

2023-04-11 14:19 分类：问答
mySQL Indexes suggestion software

Is there any software that can analyze a mySQL query, and suggest a开发者_运维技巧 specific index creation.[详细]

2023-04-11 13:20 分类：问答
Oracle 11 Index only for part of the data

I\'m using a table a table called T and have a column called C_I (Index) and C_D (Data). Now I would like to only have the row in the index if C_D = null.[详细]

2023-04-11 09:54 分类：问答
finding all indexes of a keyword in a suffix tree

This is a visual graph of a suffix tree for the input text \"mississippi\". In this example, my keyword that I\'m searching for is \"si\". I think I understand how to get the first index of \"si\"[详细]

2023-04-11 07:10 分类：问答
Good run time in mysql 5.0 without index but not in 5.1

I have a database created by MySQL 5.0. Tables have not index except primary key field. I have a query and run time is 0.9 s in MySQL 5.0. when i export database and import to newer MySql version li[详细]

2023-04-11 06:36 分类：问答
Which index option should I choose?

I have a SQL table with these columns (id, A, B, C, D, E). I usually query on (A and C) and (B 开发者_如何学运维and C) so I decide to have index on these 3. There are some options for this:[详细]

2023-04-11 05:25 分类：问答
Test for list membership and get index at the same time in Python

It seems silly to write the following: L = [] if x in L: L[x] = something else: L[x] = something_else Doesn\'t this perform the look-up for x twice?I tried using index(), but th开发者_运维技巧is g[详细]

2023-04-11 03:14 分类：问答