By Laine Campbell, Charity Majors
If you’re an IT specialist trying to develop your wisdom of database management, this sensible e-book takes you thru every one part of website reliability and operations in the context of database engines. IT staffers with minimum database operations event can use this information as a starting place of the structure and operations inside a selected database. This booklet makes use of open-source engines reminiscent of MySQL, PostgreSQL, MongoDB, and Cassandra as examples all through.
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Additional info for Database Reliability Engineering Designing and Operating Resilient Database Systems
By changing autocommit to TRUE, they reduced their query latency, which also reduced queuing for connections in the pool. 46 | Chapter 2: Operational Visibility This would initially show up as increased latency in the application as the pool was 100% utilized, causing queues to increase. By look‐ ing at the connection layer metrics, and monitoring pgbouncer pools, you would see that the waiting pool was increasing due to saturation, and that active was fully utilized most of the time. With no other metrics showing significant utilization/saturation, and errors clear, it would be time to look at what is going on inside of the connection that was slowing down queries.
It’s nothing to be ashamed of! This is how startup sausage gets made. A startup that started out by building out an elaborate opera‐ tional visibility ecosystem in advance of their actual needs would be a stupid startup. Startups succeed by focusing hard on their core product, iterating rapidly, aggressively seeking out customers, responding to customer feedback and production realities, and making hard decisions about where to spend their precious engi‐ neering resources. Startups succeed by instrumenting elaborate per‐ formance visibility systems as soon as they need them, not before.
A metric is the measurement of a property that an application or a component of your infrastruc‐ ture possesses. Metrics are observed periodically, to create a time series that contains the property or properties, the timestamp and the value. Some properties that might apply include the host, ser‐ vice, datacenter etc... The true value of this data comes in observing it over time through visualizations such as graphs. 30 | Chapter 2: Operational Visibility Metrics often have mathematical functions applied to them in order to assist humans in deriving value from their visualizations.