Extract range characters
Given a source string and a two-character range string, extracts all characters from the source that fall within the range. Sort of a simple version of the [A-Z] syntax from regular expressions....
View ArticleReverse Roman Numerals
Translate from Roman Numerals back to decimal. Legal range is 0 to 3999 (that is, N to MMMCMXCIX) You can use IV or IIII for 4. You could even use a string of twenty I's for 20, but there's a string...
View ArticleSHOW CREATE TRIGGER 5.0
SHOW CREATE TRIGGER for 5.0 - 5.1.20 CREATE FUNCTION SHOW_CREATE_TRIGGER(in_trigger varchar(255)) RETURNS text READS SQL DATA BEGIN DECLARE returnText text; SELECT CONCAT_WS( " ", "CREATE TRIGGER",...
View ArticleRoman numerals
Convert an integer in the range 0 to 3999 to Roman numerals. CREATE FUNCTION `toRoman`(inArabic int unsigned) RETURNS varchar(15) CHARSET latin1 DETERMINISTIC BEGIN DECLARE numeral CHAR(7) DEFAULT...
View ArticleShow all grants
A stored procedure to show all grants in the database. USE mysql; DELIMITER // CREATE PROCEDURE showAllGrants() BEGIN DECLARE done INT DEFAULT 0; DECLARE theUser CHAR(16); DECLARE theHost CHAR(60);...
View ArticleEaster date
Finds the date for Easter (Western) given a year. Sample usage: SELECT easter(YEAR(NOW())); DELIMITER // CREATE FUNCTION easter(inYear YEAR) RETURNS DATE DETERMINISTIC BEGIN DECLARE a, b, c, d, e, k,...
View ArticleYet another way to count occurences of a substring in a string
In response to http://forge.mysql.com/snippets/view.php?id=60 - adding support to count strings, not just characters ( character_length(<string1>) - character_length(REPLACE(<string1>,...
View ArticlePalominoDB at PerconaLive
PalominoDB is very excited about our participation in the upcoming PerconaLive conference in London. We'll have two of our European staff presenting. On Monday, Jonathan Levin will be doing a...
View ArticleWhy are your indexes larger than your actual data?
I sometimes encounter this phenomenon when a database has tables in which the indexes are larger—sometimes much larger—than the actual data stored in the table. Often, the table becomes unwieldy, which...
View ArticleWhat’s Next?
Just a heads-up that today, October 12, is my last official working day at Monty Program. The change is bittersweet. Bitter because I will very much miss working with a very talented team. Sweet...
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SkySQL & Severalnines Team-up to Help Customers Deploy MySQL® Cluster
SkySQL today announced that it will begin reselling Severalnines' ClusterControl™ product, which enables customers to set-up a production-ready, MySQL® Cluster configuration. The latest addition to...
View ArticleFeatures I’d like to see in InnoDB
I had some conversations with a few people at Oracle Open World about features that would be beneficial in InnoDB. They encouraged me to blog my thoughts, so I am. Someday I’d like to have a clear...
View ArticleProgress on High Performance MySQL 3rd Edition
A few people have asked me how it’s going, so I thought I’d just share it with everyone. Things are going great. I’m writing much more quickly than I thought I would be, and as a result I’m finding I...
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TIL: Lookout For DEFINER
The IssueI haven't blogged in a while an I have a long TODO list of things to publish: The repository for the SNMP Agent, video and slides of my OSCON talk and a quick overview of MHA master-master...
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Synchronous Replication for MySQL + InnoDB? Schooner Has It!!
MySQL with InnoDB has been proven to be the world’s best transactional database for web and enterprise. SchoonerSQL with parallel appliers has a unique approach to provide highly synchronous...
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Multi-master and read slaves using Severalnines
This blog post shows how you can use the Severalnines Configurator for MySQL Replication to deploy a Multi-master replication setup, and install ClusterControl.You can also watch videos showing what is...
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Brewing in MySQL Cluster 7.2.x
Admittedly MySQL Cluster have some way to go before monitoring becomes best in class. But, we are progressing!In 7.1 we introduced NDBINFO, which is an infrastructure that enables presenting...
View ArticleWhen 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 off....
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Uh, uh… PHP MySQL client fail over
It is the third day I try to find mysqlnd plugin use cases for the Succeed with Plugins webinar on October, 26th. Not being innovative or creative today, I looked into a classic: client fail over. As...
View ArticleCall for Papers for Collaborate ends tomorrow!
The call for papers for Collaborate ends tomorrow, Friday October 14th. Collaborate is Sunday, April 22nd through Thursday April 26th at the Mandalay Bay Convention Center in Las Vegas. This year the...
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