This section provides examples of rules written for various purposes.
- Command Center 1 2 – Minimalist Multi Utility Approach
- Command Center 1 2 – Minimalist Multi Utility Applications
- Command Center 1 2 – Minimalist Multi Utility Application
- Command Center 1 2 – Minimalist Multi Utility Appliances
Note: Rules must be entered on a single line, but the rules shown in this section are wrapped for readability.
Record high cpu utilization queries
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The following rule invokes the
gpdb_record
action when the gpadmin user runs a query and its total cpu utilization on a host exceeds 100%.Complex rule
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This rule invokes
gpdb_record
for a query that meets the following criteria:- a query has total CPU usage greater than 90% on a host and has been running for more than 45 seconds, or
- has cpu skew greater than 20%, and
- is a select on a table that contains “test” in its name.
The rule shows how you can group Boolean expressions with parentheses.
Record queries with high memory usage
This rule records a message when a query process exceeds 20% of the resident memory on a host.
Record queries with memory (rss) skew above 10%
This rule calls the
gpdb_record
action to log when memory skew exceeds 10% on a host.Record high CPU queries on a host when overall CPU utilization is high on that host
This rule records queries that are using up the CPU on a host especially when the overall CPU utilization on a host is high.
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Record high CPU query processes when overall CPU utilization on a host is high
This rule records processes that are using up the CPU especially when the overall CPU utilization on a host is high.
Command Center 1 2 – Minimalist Multi Utility Approach
Record queries with high spillfile count
This rule records total number of spillfiles created for a query across the cluster when it exceeds the specified limit.
Record queries with high vmem usage when segment vmem usage is high as well
This rule records vmem usage of queries and segments when they both exceed specified limits. This is a rule that can be used with a kill query action when the behavior of
runaway_detector_activation_percent
, which is to kill the query that consumes the highest amount of memory, is not desirable. It is recommended to turn off runaway_detector_activation_percent
if you intend to kill queries with this rule.This query can be further refined to select or filter out specific users, applications, databases, etc.
Record number of bytes written to disk on a host by any query process
This rule records the number of bytes written to disk on a host by any query process.
Record total number of bytes written to disk per sec on a host by all query processes
This rule records the total number of bytes written to disk per second on a host by all query processes.
Cancel any query where the session has run longer than 120 seconds
This rule invokes the
host:pg_cancel_backend
action when a session_id:host:pid:runtime
exceeds two minutes.Throttle the cpu utilization of a query
This rule invokes the
host:throttle_gpdb_query
action when the cpu utilization of a process exceeds a threshold and the query has run for more than 20 seconds.Throttle and even out skew
Command Center 1 2 – Minimalist Multi Utility Applications
This rule invokes
host:throttle_gpdb_query
when the total cpu usage of a query on a host exceeds 90% and the current query is a select on the skewtest table.You can observe the effects of this rule in the
gptop
GPDB Skew page.This section provides examples of rules written for various purposes.
Note: Rules must be entered on a single line, but the rules shown in this section are wrapped for readability.
Record high cpu utilization queries
Macfamilytree 9 0 10 percent. The following rule invokes the
gpdb_record
action when the gpadmin user runs a query and its total cpu utilization on a host exceeds 100%.Complex rule
This rule invokes
gpdb_record
for a query that meets the following criteria:- a query has total CPU usage greater than 90% on a host and has been running for more than 45 seconds, or
- has cpu skew greater than 20%, and
- is a select on a table that contains “test” in its name.
The rule shows how you can group Boolean expressions with parentheses.
Record queries with high memory usage
This rule records a message when a query process exceeds 20% of the resident memory on a host.
Record queries with memory (rss) skew above 10%
This rule calls the
gpdb_record
action to log when memory skew exceeds 10% on a host.Record high CPU queries on a host when overall CPU utilization is high on that host
This rule records queries that are using up the CPU on a host especially when the overall CPU utilization on a host is high.
Record high CPU query processes when overall CPU utilization on a host is high
This rule records processes that are using up the CPU especially when the overall CPU utilization on a host is high.
Command Center 1 2 – Minimalist Multi Utility Application
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Record queries with high spillfile count
Izip 2 6 – application for managing archives. This rule records total number of spillfiles created for a query across the cluster when it exceeds the specified limit.
Record queries with high vmem usage when segment vmem usage is high as well
This rule records vmem usage of queries and segments when they both exceed specified limits. This is a rule that can be used with a kill query action when the behavior of
runaway_detector_activation_percent
, which is to kill the query that consumes the highest amount of memory, is not desirable. It is recommended to turn off runaway_detector_activation_percent
if you intend to kill queries with this rule.Sidify apple music converter 1 3 2 download free. This query can be further refined to select or filter out specific users, applications, databases, etc.
Record number of bytes written to disk on a host by any query process
This rule records the number of bytes written to disk on a host by any query process.
Record total number of bytes written to disk per sec on a host by all query processes
This rule records the total number of bytes written to disk per second on a host by all query processes.
Cancel any query where the session has run longer than 120 seconds
This rule invokes the
host:pg_cancel_backend
action when a session_id:host:pid:runtime
exceeds two minutes.Command Center 1 2 – Minimalist Multi Utility Appliances
Throttle the cpu utilization of a query
This rule invokes the
host:throttle_gpdb_query
action when the cpu utilization of a process exceeds a threshold and the query has run for more than 20 seconds.Throttle and even out skew
This rule invokes
host:throttle_gpdb_query
when the total cpu usage of a query on a host exceeds 90% and the current query is a select on the skewtest table.You can observe the effects of this rule in the
gptop
GPDB Skew page.