Post: MySQL 5.5 and MySQL 5.6 default variable values differences
...MySQL 5.5.30 and MySQL 5.6.10 to the different tables and ran the query: mysql...INNODB_BUFFER_POOL_INSTANCES | 1 | 8 | | QUERY_CACHE_SIZE | 0 | 1048576 | | SLOW_QUERY_LOG_FILE | /mnt/data/...CACHE...
View ArticlePost: MySQL Replication and Slow Queries
I just filed a bug regarding slow queries executed by replication thread are not being logged to the slow query log. This is not a big… especially bad if you’re using tools to analyze slow query log to...
View ArticlePost: Managing Slave Lag with MySQL Replication
… reporting queries can have queries running for hours which stalls replication progress for this time. As MySQL…queries being replicated. Unfortunately MySQL Slow Query Log does not log replication...
View ArticlePost: Percona Toolkit 2.1.8 released today with beta support for MySQL 5.6
… slow_query_log_timestamp_always in Percona Server–were misparsed, resulting in an erroneous report. Now such no-query events show up in reports as “/* No query… word would end up reported as the...
View ArticlePost: Get Me Some Query Logs!
…slow_query_log_file=mysql-slow.log-full-20121122112413 Setting slow_query_log=1 Flushing slow query log Sleeping 5 seconds… done. Restoring slow_query_log_file=mysql-slow.log Restoring...
View ArticlePost: Ultimate MySQL variable and status reference list
…MySQL manual, especially the…report_hostblogpercona.commanual report_passwordblogpercona.commanual report_portblogpercona.commanual report…Slow_launch_threadsblogpercona.commanual...
View ArticlePost: Analyzing Slow Query Table in MySQL 5.6
…numerics to microsecond scale: sql/log.cc, MYSQL_QUERY_LOG::write(): 1945 /* For slow query log */ 1946 sprintf(query_time_buff, “%.6f”, ulonglong2double(query_utime)/1000000.0); 1947 …to do a report...
View ArticlePost: Identifying the load with the help of pt-query-digest and Percona Server
… need to attack the right query in the right way. But vanilla MySQL does have its limitations, it reports only a subset of… MySQL server, you would see an entry like this in the slow query log: #...
View ArticlePost: Visualization tools for pt-query-digest tables
…MySQL slow query logs using pt-query-digest you can store samples of each query into query_review table and historical values for review trend analysis into query…slow query log collection....
View ArticlePost: MySQL Slow query log in the table
As of MySQL 5.1 get MySQL slow query log logged in mysql.slow_log table instead of the file as you had in previous … long reporting query on the log file query execution is still proceeds. I have not...
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Replaying database load with Percona Playback
If you are planning to upgrade or make any configuration change on your MySQL database the first advice usually is:- Benchmark!How should we do that benchmark? People usually run generic benchmark...
View ArticleAnnouncing Percona Playback 0.5
Percona is glad to announce the release of Percona Playback 0.5 on November 26th, 2012. Downloads are available from our download site and Percona Software Repositories.Percona Playback is a tool for...
View ArticleCommon MySQL traps webinar questions followup
Thanks to all attendees of the webinar yesterday! If you missed it, you can watch the video recording.Here are some questions that remained unanswered due to time constraints.Q: Are there any technical...
View ArticleRead/Write Splitting with PHP Webinar Questions Followup
Today I gave a presentation on “Read/Write Splitting with PHP” for Percona Webinars. If you missed it, you can still register to view the recording and my slides.Thanks to everyone who attended, and...
View ArticleImplications of Metadata Locking Changes in MySQL 5.5
While most of the talk recently has mostly been around the new changes in MySQL 5.6 (and that is understandable), I have had lately some very interesting cases to deal with, with respect to the...
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Is MySQL 5.6 slower than MySQL 5.5?
There have been a number reports/benchmarks showing MySQL 5.6 to be slower than MySQL 5.5 on variety of workloads. There are many possible reasons and I believe we will learn about many of them in the...
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MySQL 5.6 vs MySQL 5.5 and the Star Schema Benchmark
MySQL 5.6 vs MySQL 5.5 & the Star Schema BenchmarkSo far most of the benchmarks posted about MySQL 5.6 use the sysbench OLTP workload. I wanted to test a set of queries which, unlike sysbench,...
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SSL Performance Overhead in MySQL
NOTE: This is part 1 of what will be a two-part series on the performance implications of using in-flight data encryption.Some of you may recall my security webinar from back in mid-August; one of the...
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MySQL Error: Too many connections
We have always received quite few questions here at Percona Support on how to avoid the dreaded “Too many connections” error, as well as what is the recommended value for max_connections. So, in this...
View ArticleIncreasing slow query performance with the parallel query execution
MySQL and Scaling-up (using more powerful hardware) was always a hot topic. Originally MySQL did not scale well with multiple CPUs; there were times when InnoDB performed poorer with more CPU cores...
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