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Postgres performance gone south but nothing changed !
Postgres seems pretty cool as open source databases go. I’m finding a much greater affinity for Postgres than say MySQL. On the other hand, coming from an Oracle background there are a few things that...
View ArticleMySQL waits and CPU
Question: how do I know that one user is waiting for a lock and another user is burning CPU on MySQL? i.e. how can I create active session history on MySQL like on Oracle? Two simple cases I’m looking...
View ArticleMySQL -> what to do with NESTING_EVENT_ID
How does one use NESTING_EVENT_ID? Below I’ve selected from events_waits_history_long for a thread, but none of the NESTING_EVENT_ID values show up in EVENT_ID or END_EVENT_ID mysql> select ->...
View ArticleMySQL : events_waits_current – who is waiting and who is on CPU
Anyone familiar with Oracle performance tuning know about ASH , aka active session history. ASH saves a history of every session that is active every collection, which by default is once per second....
View Articleintroducing network latency on Docker (SQL Server Always On testing)
I am testing out Always On replication on SQL Server with a cool docker setup that includes primary and secondary https://github.com/rafaelrodrigues3092/docker-mssql-alwayson When I created data on the...
View ArticleSetting up Always ON (SQL Server)
There is a great little docker setup that starts Always On (SQL Servers instance replication not to be confused with their article i.e. table replication). The docker setup creates a primary and a...
View ArticleProtected: DataDog – the marriage of ASH, Query Stats and UI
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View ArticleJDBC Request: Cannot load JDBC driver class’com.mysql.jdbc.Driver’ solution
Just quick post to document a troublesome error when running Jmeter on Mysql JDBC Request: Cannot load JDBC driver class’com.mysql.jdbc.Driver’ solution Should be pretty simple, it’s just a...
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Are some MySQL wait events actually CPU time ?
Sure, wait event times in any database will include some CPU time, though ideally it should be minimal. Waits should be instrumented as close to the off CPU wait event as possible, i.e. if I’m doing an...
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New works by John Williams Waterhouse “discovered”
Is there an artist you liked, but would love to have seen more works by? I always liked John William Waterhouse and wished there were more pieces. You may be familiar the works of Waterhouse like Hylas...
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