Emergency

Search Results for: explain index

MongoDB Index Shootout: Covered Indexes vs. Clustered Fractal Tree Indexes

In my two previous blogs I wrote about our implementation of Fractal Tree Indexes on MongoDB, showing a 10x insertion performance increase and a 268x query performance increase. MongoDB’s covered indexes can provide some performance …

Read More
 

Webinar: Understanding Indexing

Three rules on making indexes around queries to provide good performance Application performance often depends on how fast a query can respond and query performance almost always depends on good indexing. So one of the …

Read More
 

Indexing Big Data – NSF Workshop on Research Directions in the Principles of Parallel Computation

I attended the NSF Workshop on Research Directions in the Principles of Parallel Computation in Pittsburgh on 6/27/12. The workshop brought together researchers from academia and industry to explore visions for the future of parallel computing. …

Read More
 

Find unused indexes

I wrote one week ago about how to find duplicate indexes. This time we’ll learn how to find unused indexes to continue improving our schema and the overall performance. There are different possibilites and we’ll …

Read More
 

Find and remove duplicate indexes

Having duplicate keys in our schemas can hurt the performance of our database: They make the optimizer phase slower because MySQL needs to examine more query plans. The storage engine needs to maintain, calculate and …

Read More
 

When EXPLAIN estimates can go wrong!

I have been working with a few customer cases and one interesting case popped up. The customer was facing a peculiar problem where the rows column in the EXPLAIN output of the query was totally …

Read More
 

Understanding Indexing – NY Effective MySQL Meetup

At next week’s NY Effective MySQL Meetup, I will give a talk: “Understanding Indexing: Three rules on making indexes around queries to provide good performance.” The meetup is 7 pm Tuesday, October 11th, and will …

Read More
 

Understanding Indexing – SF MySQL Meetup

At this week’s SF MySQL Meetup, I will give a talk: “Understanding Indexing: Three rules on making indexes around queries to provide good performance.” The meetup is 7 pm tomorrow (Wednesday, 6/22), and will be …

Read More
 

Understanding Indexing – MySQL Meetup

Yesterday, at the Boston MySQL Meetup, I gave a talk on indexing. It is posted here (also goo.gl/S2LBe). In short, indexes are used to improve query performance. As a result, good indexes are designed around …

Read More
 

Advanced index analysis with mk-index-usage

The new release of Maatkit has a useful feature in mk-index-usage to help you determine how indexes are used in more flexible ways. The default report just prints out ALTER statements for removing unused indexes, …

Read More