System KPI-aided Diagnosis

Availability

This feature is available since MogDB 1.1.0.

Introduction

KPIs are views of key performance indicators for kernel components or the entire system. Based on KPIs, users can learn about the real-time and historical running status of the system.

Benefits

• Summarized system load diagnosis

  Precise alarms for system load exceptions (overload, stall, and SLA exceptions) and precise system load profile

• Summarized system time model diagnosis

  Instance-level and query-level time model segmentation, diagnosing the root causes of instance and query performance problems

• Query performance diagnosis

  Database-level query summary, including top SQL, SQL CPU usage, I/O consumption, execution plan, and excessive hard parsing

• Diagnosis of disk I/O, index, and buffer performance problems

• Diagnosis of connection and thread pool problems

• Diagnosis of checkpoint and redo (RTO) performance problems

• Diagnosis of system I/O, LWLock, and wait performance problems

  Diagnosis of over 60 modules and over 240 key operation performance problems

• Function-level performance monitoring and diagnosis (by GSTRACE)

  Tracing of over 50 functions at the storage and execution layers

Description

MogDB provides KPIs of 11 categories and 26 sub-categories, covering instances, files, objects, workload, communication, sessions, threads, cache I/O, locks, wait events, and clusters.

Figure 1 shows the distribution of kernel KPIs.

Figure 1 Distribution of kernel KPIs

Enhancements

None.

Constraints

• Utility statements do not support normalization. Non-DML statements, such as CREATE, DROP, COPY, and VACUUM, are not supported.
• Currently, only the top-level normalized SQL statements are recorded. SQL statements in a stored procedure are not normalized, and only the SQL statements that call the stored procedure are recorded.

Dependencies

None.