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Search Results for: where

OpenStack Live 2015: FAQs on the who, what, where, when, why & how

This April 13-14 Percona is introducing an annual conference called OpenStack Live. I’ve seen a few questions about the new event so decided to help clarify what this show is about and who should attend. …


Where to get a BZR tree of the latest MySQL releases

I just posted this to the MySQL Internals mailing list: Hi all, Like many of you, I’m disappointed that the bzr trees for MySQL are out of sync with the tarball source and binary releases …


Where Percona software goes before it’s released

Where does software go while it’s waiting for release? The answer is: our experimental repository! For anywhere from a few days to a week before we release them, we stage our software releases in the TESTING …


Find where your data is replicated, win a Percona Live ticket

Percona Live London starts on Monday, so this is the last in the series of free-Percona-Live tickets we’ll give away. But first — have you ever wondered what servers are in your MySQL replication hierarchy? …


Dude, Where’s my Fractal Tree?

Unless you are Ashton Kutcher (@aplusk), or one of his Hollywood buddies, you don’t need to read any further. Allow me to explain… Over the weekend, we launched our new website. This type of announcement …


Where does HandlerSocket really save you time?

HandlerSocket has really generated a lot of interest because of the dual promises of ease-of-use and blazing-fast performance. The performance comes from eliminating CPU consumption. Akira Higuchi’s HandlerSocket presentation from a couple of months back …


Scenarios where TokuDB’s Loader is Used

TokuDB’s loader uses the available multicore computing resources of the machine to presort and insert the data. In the last couple of posts (here and here), Rich and Dave presented performance results of TokuDB’s loader. …


Is there a performance difference between JOIN and WHERE?

I’ve heard this question a lot, but never thought to blog about the answer. “Is there a performance difference between putting the JOIN conditions in the ON clause or the WHERE clause in MySQL?” No, …


How expensive is a WHERE clause in MySQL?

This is a fun question I’ve been wanting to test for some time.  How much overhead does a trivial WHERE clause add to a MySQL query?  To find out, I set my InnoDB buffer pool …


Do you always need index on WHERE column ?

I believe we wrote about this before, but this topic popups again and again. Today I’ve read opinion that if we have clause WHERE has_something=1 we should have index on column has_something (the column has …