Performance Analysis and Troubleshooting Methodologies for Databases

1 . Performance Analysis and Troubleshooting Methodologies for Databases Peter Zaitsev, CEO Percona July 9th, 2019 Montpellier Big Data and Data Science Meetup © 2019 Percona. 1 

2 .Thank you © 2019 Percona. 2 

3 .Enjoying South of France © 2019 Percona. 3 

4 .Lets Get to Kow you! How Many of you are… © 2019 Percona. 4 

5 .Databases and Performance Databases are frequent Performance Trouble Makers © 2019 Percona. 5 

6 .Why Databases are Painful ? Generally Non-Linear Scalability Complex Often Poorly understood by developers © 2019 Percona. 6 

7 .Performance Work with Databases Troubleshooting Capacity Planning Cost and Efficiency Optimization Change Management © 2019 Percona. 7 

8 .Points of View BlackBox – WhiteBox – “Application “DBA, Ops” Developer” © 2019 Percona. 8 

9 .Developer Point of View Database as a Blackbox I throw queries at it and it responds DBaaS bring this “promise” to OPS too © 2019 Percona. 9 

10 .BlackBox Success Criteria for Databases Availability Response Time Correctness Cost © 2019 Percona. 10 

11 .Ops Point of View Load Resource Utilization System/Hardware Problems Scaling/Capacity Planing © 2019 Percona. 11 

12 .Methodologies for Performance Troubleshooting and Analyses © 2019 Percona. 12 

13 .Typical Default Troubleshooting by Random Googling © 2019 Percona. 13 

14 .Problems with Typical Approach Hard to Assure Outcome Hard to Train People Hard to Automate © 2019 Percona. 14 

15 .Methodologies Save the Day USE (Utilization, Golden Signals (Latency RED (Rate, Errors(Rate), Saturation, Errors) - Traffic - Errors - Duration) Method Tom Method by Brendan Saturations) Method by Wilkie Gregg Rob Ewaschuk © 2019 Percona. 15 

16 .USE Method © 2019 Percona. 16 

17 .USE Method Basics Developed to Troubleshoot Server Performance Issues Resolve 80% of problems with 5% of Effort Operating System Specific Checklists Available © 2019 Percona. 17 

18 .USE Method in One Sentence “For every resource, check utilization, saturation, and errors.” © 2019 Percona. 18 

19 .USE Method Terminology Defitinions Resource • all physical server functional components (CPUs, disks, busses, ...) Utilization • the average time that the resource was busy servicing work Saturation • the degree to which the resource has extra work which it can't service, often queued Errors • the count of error events © 2019 Percona. 19 

20 .USE Method Resources CPUs: sockets, cores, hardware threads (virtual CPUs) Memory: capacity Network interfaces Storage devices: I/O, capacity Controllers: storage, network cards Interconnects: CPUs, memory, I/O © 2019 Percona. 20 

21 .USE Method with Software Same Basic Resources Apply Additional Software Resources Apply Mutex Locks File Descriptors Connections © 2019 Percona. 21 

22 .USE Method Benefits Proven Track Record Broad Applicability Detailed Checklists Available © 2019 Percona. 22 

23 .USE Method Drawbacks Requires Good Understanding of System Architecture Requires Access to Low Level Resources Monitoring Hard to apply in Service “Blackbox” environments © 2019 Percona. 23 

24 .Cloud Computing Limits in place to isolate Tenants Dynamic Resource Management True “Hardware” properties on Hypervisor level only © 2019 Percona. 24 

25 .Understanding Queueing © 2019 Percona. 25 

26 .Many Different Levels Process running on • Actually waiting on the Memory CPU Process Running from • May be put to queue due to CPU User Standpoint saturation Disk request issued to • Can be waiting on network EBS © 2019 Percona. 26 

27 .USE Method for Linux http://www.brendangregg.com/USEmethod/use-linux.html © 2019 Percona. 27 

28 .Percona Monitoring and Management 100% Free and Open Source Purpose Build for Open Source Database Monitoring Based on leading Open Source Technologies – Grafana, Prometheus Easy to Set up © 2019 Percona. 28 

29 .CPU Utilization © 2019 Percona. 29