indexing

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Which indices should be added to speed up queries on massive InnoDB table?

Here is my table: CREATE TABLE `letters` ( `a` bigint(20) unsigned NOT NULL, `b` bigint(20) unsigned NOT NULL,[详细]

2023-04-09 15:08 分类：问答
Get index from a list where the key changes, groupby

I have a list that looks like this: myList = [1, 1, 1, 1, 2, 2, 2, 3, 3, 3] What I want to do is record the index where the items in the list changes value. So for my list above it would be 3, 6.[详细]

2023-04-09 11:35 分类：问答
Dump postgres data with indexes

I\'ve got a Postgres 9.0 database which frequently I took data dumps of it. This database has a lot of indexes and everytime I restore a dump postgres starts background task vacuum cleaner (is that r[详细]

2023-04-09 07:45 分类：问答
Solr query based on a string field's subset

I\'d like to send a string to Solr and let it answer with all records which are a subset of that string.[详细]

2023-04-09 04:46 分类：问答
Why are bitmap index operations high CPU bound?

Why are bitmap index operations have a tradeoff being high CPU bound开发者_如何学编程?[详细]

2023-04-08 22:27 分类：问答
SQLite: Optimize table scans

In my table I have some columns that have no index on them, searching for a value in those columns can take very long because SQLite does a full table scan.[详细]

2023-04-08 20:10 分类：问答
PHP reindex array? [duplicate]

This question already has answers here: 开发者_StackOverflow社区How to reindex an array? (6 answers)[详细]

2023-04-08 17:47 分类：问答
How to drop all of the indexes except primary keys with single query

I am planning to drop all of the indexes except the primary keys. I made the primary keys myself but all oth开发者_开发问答er indexes was suggestion of SQL Server.[详细]

2023-04-08 11:31 分类：问答
Oracle data distribution across date index

There\'s a situation that arises in large database tables (~50 million rows) where users need to browse date-indexed records.[详细]

2023-04-08 11:30 分类：问答
Why does removing this index in MySQL speed up my query 100x?

I have the following MySQL table (simplified): CREATE TABLE `track` ( `id` int(11) NOT NULL AUTO_INCREMENT,[详细]

2023-04-08 07:12 分类：问答