Planet MySQL Planet MySQL: Meta Deutsch Español Français Italiano 日本語 Русский Português 中文
10 Newer Entries Showing entries 31 to 40 of 16738 10 Older Entries

Displaying posts with tag: mysql (reset)

Getting connection information with MySQL 5.7
Employee +3 Vote Up -0Vote Down

MySQL 5.7 has had some great improvements within Performance Schema to be able to better trace what connections are doing, from adding memory information, through to transaction information, metadata locking, prepared statements, and even …

  [Read more...]
How to setup a PXC cluster with GTIDs (and have async slaves replicating from it!)
+0 Vote Up -0Vote Down

This past week was marked by a series of personal findings related to the use of Global Transaction IDs (GTIDs) on Galera-based clusters such as Percona XtraDB Cluster (PXC). The main one being the fact that transactions touching MyISAM tables (and FLUSH PRIVILEGES!) issued on a giving node of the cluster are recorded on a GTID set bearing the node’s server_uuid as “source id” and added to the binary log (if the node has …

  [Read more...]
vCloud Air and business-critical MySQL
+0 Vote Up -1Vote Down

VMware Continuent, a multi-site, multi-master database cluster solution, provides a full data management solution that is already handling billions of transactions daily for our customers, on-premises and in the cloud. Join us to learn how Continuent and MySQL can run business-critical applications in vCloud Air, VMware's hybrid cloud solution. 

In this new webinar-on-demand, you will learn

MySQL Dumping and Reloading the InnoDB Buffer Pool
Employee_Team +0 Vote Up -0Vote Down

MySQL’s default storage engine as of version 5.5 is InnoDB. InnoDB maintains a storage area called the buffer pool for caching data and indexes in memory. By keeping the frequently-accessed data in memory, related searches are retrieved much faster than reading from disk.

When you stop or restart MySQL, you lose the cached data stored in the buffer pool. There is a feature in MySQL 5.6 which allows you to dump the contents of the buffer pool before you …

  [Read more...]
More on MySQL 5.6 multi-threaded replication and GTIDs (and Feb. 25 webinar)
+1 Vote Up -0Vote Down

In a previous post, titled “Multi-threaded replication with MySQL 5.6: Use GTIDs,” I explained that using GTID replication is almost a requirement when using MySQL 5.6 MTS. Let’s see now how to perform the day-to-day operations when MTS and GTIDs are both enabled. (I’ll also be presenting a related webinar next week titled “Multi-threaded Replication in MySQL 5.6 and …

  [Read more...]
Enterprise Monitor: “Add Bulk MySQL Instances” 50 in 1-click.
Employee +1 Vote Up -0Vote Down

Carrying on with my MySQL 5.7 Labs Multi Source Replication scenario, I wanted to evaluate performance impact via MySQL Enterprise Monitor.

Whilst I opened my environment, I remember that I had generated lots of different skeleton scripts that allowed me to deploy the 50 servers quickly, and I didn’t want to add each of my targets 1 by 1 in MEM. So, I used one of the many features available, “Add Bulk MySQL Instances”.

So, I’ve …

  [Read more...]
MySQL Performance : Impact of InnoDB Transaction Isolation Modes in MySQL 5.7
Employee +5 Vote Up -0Vote Down

There were so many valuable articles already written by others over past years explaining all details about InnoDB transaction isolation modes and how to deal with this. So, I'll avoid to repeat what was already said ;-) -- my attention attracted the performance study made by PeterZ and published in the following article: http://www.percona.com/blog/2015/01/14/mysql-performance-implications-of-innodb-isolation-modes/ -- the article is very good and providing a good analyze of the …

  [Read more...]
‘Indexing’ JSON documents for efficient MySQL queries over JSON data
+2 Vote Up -0Vote Down

MySQL meets NoSQL with JSON UDF

I recently got back from FOSDEM, in Brussels, Belgium. While I was there I got to see a great talk by Sveta Smirnova, about her MySQL 5.7 Labs release JSON UDF functions. It is important to note that while the UDF come in a 5.7 release it is absolutely possible to compile and use the UDF with earlier versions of MySQL because the UDF interface has not changed for a long time. However, the UDF should still be considered alpha/preview level of quality and should not be used in production yet! For this example I am using Percona …

  [Read more...]
Extent Descriptor Page of InnoDB
Employee_Team +3 Vote Up -0Vote Down

Within the MySQL data directory, the InnoDB storage engine creates two types of files — the data files and the redo log files. Each data file (or ibd file) belongs to exactly one tablespace. Each tablespace is given a unique identifier called the space_id. One tablespace can have 1 or more data files. If a tablespace has more than one data file, then the data files have a specific order or sequence. The data files can be thought of as being concatenated to each other in that specific order.

The data file is made up of a …

  [Read more...]
Storage efficiency
+0 Vote Up -0Vote Down

Storage efficiency is a big deal. I have learned a lot about read, write and space amplification over the past few years. Tiered storage has been a part of my work life via flashcache, but tiered storage for an LSM doesn't require flashcache. This is going to get interesting. We have more choices for SSD at a variety of price points based on write endurance and performance.  We have write-optimized database engines (RocksDB, …

  [Read more...]
10 Newer Entries Showing entries 31 to 40 of 16738 10 Older Entries

Planet MySQL © 1995, 2015, Oracle Corporation and/or its affiliates   Legal Policies | Your Privacy Rights | Terms of Use

Content reproduced on this site is the property of the respective copyright holders. It is not reviewed in advance by Oracle and does not necessarily represent the opinion of Oracle or any other party.