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When all cluster monitoring components are installed, configured, and running, the Grafana dashboards can be used to monitor SingleStore cluster health over time.

Each dashboard provides insights that can be used to identify trends that may require intervention, including:

Cluster View

Chart Name	What it shows	When to use it
CPU Utilization	The percentage of the host’s CPU that is being used: max single-core load: The maximum CPU load across all of the available CPU cores avg core load: The average CPU load across all of the available CPU cores min single-core load: The minimum CPU load across all of the available CPU cores	To understand CPU usage and host resource usage in general, or for a given workload.
Memory Utilization	The percent of the host’s memory that is being used	To understand host memory usage for a given workload over time.
Local Disk Utilization	The local disk utilization for the cluster Total storage can be managed by dropping obsolete tables and/or purging older data in large tables.	To identify the amount of warm data so preventive actions can be taken to better handle the load, thereby ensuring stability and optimum performance.
Read/Write Queries per Second	The number of reads/writes per second of the queries running on the system	To understand typical (“normal”) cluster activity to benchmark workloads and their query rate and identify anomalies in the read/write workload. If the number of rows read or written is very high or uneven, it could indicate that some queries or operations are taking longer to process than others. This can be due to poor indexing, inefficient queries, or database design issues.
Failed Read/Write Queries per Second	The number of reads/writes failed per second of the queries running on the system
Rows Read or Written	The number of rows read/written
Network Received or Sent Bytes	The network bytes sent and received	To understand network usage for a given workload, identify bottlenecks, and determine if any non-SingleStore activity is affecting a host’s network.
Execution Time per Read/Write Query	The elapsed time of read/write query	To identify changes in the pattern of execution time per read/write query from the historical norm. This may indicate an issue with an application or changes in your workload.
Threads - Connected	The number of open connections (`threads_connected`) to the database relative to the maximum limit (`max_connections`)	To identify if the database is approaching the maximum allowed connections, which is indicated by a utilization near 100%. This can potentially lead to performance issues, as queries may need to wait in a queue until threads become available to process them.
Threads - Running	The number of threads that are actively running queries (`threads_running`) relative to the maximum limit (`max_connection_threads`)	To identify if the system is approaching its capacity with regard to the number of queries that can be executed in parallel, which is indicated by a utilization near 100%. This can potentially lead to resource pressure, system unresponsiveness, latency spikes, and eventual failures.

Detailed Cluster View by Node

Chart Name	What it shows	When to use it
All Metrics in Cluster View Reported per Node	All metrics in cluster view reported per node	To understand resource utilization of a node and to ensure the workload is evenly distributed across nodes for ideal performance.

Disk Usage

Note: Requires SingleStore version 8.0.23 or later.

Chart Name	What it shows	When to use it
Disk Utilization	Disk utilization for the cluster Total storage can be managed by dropping obsolete tables and/or purging older data in large tables.	To identify the quantity of warm data so preventive action can be taken to better handle the load, thereby ensuring stability and optimum performance.
Distribution of Components Using Disk	Distribution of disk utilization by data, plancache, auditlogs, and tracelogs	To understand how the disk is being utilized. Analyzing disk usage can reveal if certain artifacts (such as data, plancache, audit logs, or trace logs) are consuming an excessive amount of space. This can either cause performance issues, or require additional resources to maintain optimal operation. Monitoring disk usage and activity can also help identify performance bottlenecks, which may require disk policies to be adjusted, additional resources to be allocated, and/or your workload to be optimized.
Breakdown of Disk Utilization by Data	Disk consumption breakdown by "Data" category Adding utilization across blobs, transaction logs, snapshots, temp blobs, etc. will be equal to the total disk utilized by "Data."
Distribution of Databases Using Disk	Distribution of disk utilization by databases. Adding utilization across databases will be equal to the total disk utilized by "Data."
Blob Cache Downloaded per Second (by Database)	Rate at which the blob cache is downloading files from remote storage	To understand how SingleStore's blob cache is performing. By understanding and monitoring the rate at which the blob cache is downloading files from remote storage, potential performance bottlenecks and/or issues related to blob cache activity can be identified. For example, if high download rates are observed relative to the size of your database and scale of your hardware, you may consider increasing the local cache size. Regularly reviewing this metric can help you make well-informed decisions for optimizing the performance of SingleStore.
Blob Cache Evicted per Second (by Database)	Rate at which the blob cache is evicting files	To understand how SingleStore’s blob cache is performing. By understanding and monitoring the rate at which the blob cache is evicting files, system resource utilization can be optimized based on your data management needs. A high eviction rate may indicate that the cache size is insufficient, or that your workload is imposing a high cache turnover. To improve overall cluster performance, reviewing data access patterns and adjusting the cache size is recommended. Regularly reviewing this metric can help you identify potential performance bottlenecks and make well-informed decisions for optimizing the performance of SingleStore.

Historical Workload Monitoring

Chart Name	What it shows	When to use it
Elapsed Time per Execution by Database	The elapsed time per query, grouped by database	To identify which databases incur the most long-running queries and observe changes in the pattern of execution time per query from the historical norm. This may indicate an issue with an application or changes in your workload.
Execution Count	The number of queries executed in a given time	To perform capacity planning for workloads and identify if workloads in general, or workload spikes in particular, are putting the cluster at risk of running out of memory.
CPU Time per Execution by Database	The CPU time spent per query activity, grouped by database	To identify which databases incur the most CPU usage. Note: A blank database indicates system activity that is not related to a user database.
Memory Usage per Execution by Database	The memory bytes spent per query activity, grouped by database	To identify which databases incur the most memory usage. Note: A blank database indicates system activity that is not related to a user database.
Disk Bytes per Execution by Database	The disk bytes spent per query activity, grouped by database	To identify which databases incur the most disk bytes. Note: A blank database indicates system activity that is not related to a user database.
Network Bytes per Execution by Database	The network bytes spent per query activity, grouped by database	To identify which databases incur the most network bytes. Note: A blank database indicates system activity that is not related to a user database.
Metrics by Query Plan	The queries executed and their relative resource consumption	To identify which queries are expensive, including how long queries are taking to complete, their CPU times, failure rates etc.

Memory Usage

Chart Name	What it shows	When to use it
Total Memory Used vs. Total Limit	The memory in use compared to the total memory available (megabytes)	To perform capacity planning for memory and identify if the cluster is not performing optimally due to a shortage of memory.
Query Memory vs. Total Limit	The query memory in use compared to the total memory available (megabytes)	To perform capacity planning for workloads and identify if workloads in general, or workload spikes in particular, are putting the cluster at risk of running out of memory.
Data Memory Used vs. Total Limit	The data memory in use versus the total memory available (megabytes)	To perform capacity planning for data memory and identify if given write workloads are putting the cluster at risk of running out of memory.
Internal Memory Allocators vs. Limit	The memory used by SingleStore memory allocators (megabytes)	To identify why memory allocations have increased, or are anomalously large, when there are no other indicators of increased memory use, such as workload or data, and to discover where memory is allocated (table, query, etc.).

Pipeline Dashboards

Note: Requires SingleStore version 8.0.25 or later.

Pipeline Summary

Chart Name	What it shows	When to use it
State Distribution	A high-level overview of all pipelines, including the number of pipelines in running, stopped, and error states, and the percentage of each	To identify potential issues by comparing the number of running pipelines to those that have either stopped or produced an error.
Historical Pipeline State	The state of all pipelines over a period of time	To identify potential issues by examining how a pipeline behaves over time.
Summary	The current state of all pipelines	To identify which pipelines are currently running, stopped, or in an errored state along with their associated database.

Pipeline Performance

Chart Name	What it shows	When to use it
Execution Count	The total number of executions that have run in a pipeline (specifically, the queries that are run in the engine that ingest the data into tables)	To observe the workload from pipelines.
Avg CPU Time per Execution	The average CPU time for each execution in a pipeline	To identify which pipelines are consuming excessive CPU cycles.
Avg Elapsed Time per Execution	The average elapsed time for each execution in a pipeline	To identify which pipelines are experiencing degraded performance over time.
Avg I/O per Execution	The average disk I/O (number of bytes that SingleStore read and written to the filesystem or the in-memory transaction log) per execution in a pipeline Note that this is the average value of disk_b from the total of `run_count`, `success_count`, and `failure_count` (from the MV_ACTIVITIES_CUMULATIVE table). This is focused more on the load on the server than the data being ingested.	To identify if a pipeline is experiencing I/O-related performance issues (typically when this value is consistently high).
Avg Memory Use per Execution	The average memory usage per execution in a pipeline	To identify which pipelines are exhibiting excessive memory use.
Avg Network Bytes per Execution	The average network bytes per execution in a pipeline	To identify which pipelines are experiencing degraded performance due to network constraints.
Pipeline Errors	Which pipelines have produced an error, including the pipeline name, error ID, error code, error message, and the time the error occurred	To identify and troubleshoot pipelines that have produced an error.

Query History

Note: Requires SingleStore version 8.5 and later.

Chart Name	What it shows	When to use it
Query History	Query runtimes, those queries that have succeeded, and those queries that have failed.	To view query runtimes over time, identify and resolve slow-running and failed queries, and view and optimize workloads in real time.

Resource Pool Monitoring

Note: Requires SingleStore version 8.0.26 or 8.1.24 and later.

Chart Name	What it shows	When to use it
Finished Queries	The number of queries finished on a given resource pool	To perform capacity planning for workloads by resource pool and identify if workloads in general, or workload spikes in particular, are queueing the queries by current resource pool configurations.
Killed Queries	The number of queries killed on a given resource pool	To understand how many queries are killed on a given resource pool.
Queueing Queries	The number of queries queued for a given resource pool	To understand how many queries are queued over time and perform capacity planning to increase resource limits for a given pool as needed.
Queue Time per Queued Query	The average queue time per query for a given resource pool	To understand how long queries are being queued; helps to perform capacity planning to increase resource limits for a given pool as needed.

Last modified: July 30, 2024

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