Geographic information systems (GIS) are used by application developers to incorporate geographic information into their datasets to create apps with cool features such finding the address to the best steakhouse in town or the locations of local points of historical interest (the list is endless). In a nutshell, GIS captures, store, checks and displays […]
Read moreOver the past few months, I’ve seen an increase in the following use case while working on performance and schema review engagements:
I need to store exponentially increasing amounts of data and analyze all of it in real-time.
This is also known simply as: “We have big data.” Typically, this data is used for user interaction […]
I recently helped a client implement a custom replication delay monitor and wanted to share the experience and discuss some of the iterations and decisions that were made. percona-millipede was developed in conjunction with Vimeo with the following high-level goal in mind: implement a millisecond level replication delay monitor and graph the results. Please […]
Read moreRecently, I helped a client that was having issues with deployments causing locking in their production databases. At a high level, the two key components used in the environment were:
Capistrano (scripted deployments) [website]
Liquibase (database version control) [website]
At a high level, they currently used a CLI call to Liquibase as a sub-task within a larger […]
Read moreDrupal is one of the most popular open source CMS applications available – and it runs primarily on a MySQL backend. Out of the box, the schema is well tuned and indexed. However, there are some ways to tweak the default installation to get more out of the system right from start. Similarly, there […]
Read moreStatement-based or row-based, or mixed? We’ve all seen this discussed at length so I’m not trying to rehash tired arguments. At a high level, the difference is simple:
Statement based replication (SBR) replicates the SQL statements to the slave to be replayed
Row based replication (RBR) replicates the actual rows changed to the slave to be […]
Recently, I was working with a client that asked about using Percona Xtrabackup to take a snapshot of a particular MySQL schema and then reload it with a different schema name on the same server. It caught me off guard because I’d never really thought about it – typically, I’ve used Xtrabackup simply to […]
Read moreA common practice to offload traffic from MySQL 5.6 is to use a caching layer to store expensive result sets or objects. Some typical use cases include:
Complicated query result set (search results, recent users, recent posts, etc)
Full page output (relatively static pages)
Full objects (user or cart object built from several queries)
Infrequently changing data (configurations, […]
Well, it happened again… Another lengthy EBS outage in the US-East region impacted several sites across the net. While failures like this are rare, they can be quite costly and translate into headaches for the operations team when impact production systems for any length of time. At Percona, we routinely help clients architect and […]
Read moreI recently worked through an issue with a client trying to detect data drift across some servers that were located in different timezones. Unfortunately, several of the tables had timestamp fields and were set to a default value of CURRENT_TIMESTAMP. From the manual, here is how MySQL handles timezone locality with timestamp fields:
Values for TIMESTAMP columns are […]
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