DBCP Connection Pool Monitoring

This section describes the types, names, and meanings of DBCP connection pool metrics collected by APM.

**Table 1** DBCP connection pool collection parameters
Parameter	Data Type	Application Type	Default	Supported Start Agent Version	Supported End Agent Version	Description
Threshold (ms) for Reporting Connection Trace	integer	JAVA	1	2.1.3	-	Threshold for reporting getConnection method traces. If the threshold is not exceeded, such traces will not be reported.
Obtain Pool Info or Not	radio	JAVA	false	2.1.3	-	Whether to obtain pool information when getting connections

**Table 2** DBCP connection pool metrics
Category	Metric	Name	Description	Unit	Data Type	Default Aggregation Mode
Data source (dataSource)	url	url	url	-	ENUM	LAST
	driverClassName	Driver	Driver	-	STRING	LAST
	initialSize	Initialized Connections	Number of initialized connections	-	INT	LAST
	minIdle	Min. Idle Connections	Minimum number of idle connections in the pool	-	INT	LAST
	maxIdle	Max. Idle Connections	Maximum number of idle connections in the pool	-	INT	LAST
	maxTotal	Max. RT	Maximum response time	-	INT	LAST
	numIdle	Idle Connections	Number of idle connections	-	INT	LAST
	numActive	Active Connections	Number of active connections	-	INT	LAST
	maxWaitMillis	Max. Time for Waiting Connection to Be Reclaimed	Maximum time for a waiting connection to be reclaimed (when no connection is available) before an exception is thrown	-	INT	LAST
	testOnCreate	Validity Check Upon Connection Creation	Whether to check the validity of a connection after it is created	-	STRING	LAST
	testOnBorrow	Validity Check Before Obtaining Connection	Check whether a connection is valid before obtaining it from the connection pool.	-	STRING	LAST
	testWhileIdle	Idle Connection Validity Check	Whether to verify the validity of an idle connection when an application applies for it from the pool	-	STRING	LAST
	timeBetweenEvictionRunsMillis	Interval for Checking Connection Validity	If testOnBorrow is set to false and testWhileIdle is set to true, the application checks whether the idle time of a connection is greater than timeBetweenEvictionRunsMillis before obtaining the connection. If it is greater than that value, the application checks whether the connection is valid.	-	INT	LAST
	removeAbandonedOnBorrow	Remove Discarded Connections When Obtaining Connections	Whether to remove discarded connections when obtaining connections. (The following conditions must be met: "getNumActive() > getMaxTotal() – 3" and "getNumIdle() < 2")	-	STRING	LAST
	removeAbandonedOnMaintenance	Remove Discarded Connections During Maintenance	Whether to remove discarded connections in the maintenance cycle (when the eviction ends)	-	STRING	LAST
	removeAbandonedTimeout	Connection Removal Timeout	If a connection is not used within the specified timeout, it is regarded as a discarded connection and can be removed.	-	INT	LAST
Connection details (connection)	url	Connection Address	Connection address	-	ENUM	LAST
	invokeCount	Calls	Number of calls	-	INT	SUM
	totalTime	Total Time	Total time	-	INT	SUM
	errorCount	Errors	Number of errors	-	INT	SUM
	maxTime	Max. RT	Maximum response time	-	INT	SUM
	range1	0–10 ms	Number of requests with 0–10 ms response time	-	INT	SUM
	range2	10–100 ms	Number of requests with 10–100 ms response time	-	INT	SUM
	range3	100–500 ms	Number of requests with 100–500 ms response time	-	INT	SUM
	range4	500–1000 ms	Number of requests with 500–1000 ms response time	-	INT	SUM
	range5	1–10s	Number of requests with 1–10s response time	-	INT	SUM
	range6	> 10s	Number of requests with response time longer than 10s	-	INT	SUM
	concurrentMax	Max. Concurrency	Maximum concurrency	-	INT	MAX
Version (version)	version	Version	Version	-	STRING	LAST
Exception (exception: exception statistics of DBCP calls)	exceptionType	Exception Type	Exception type	-	ENUM	LAST
	causeType	Exception Class	Exception class	-	ENUM	LAST
	count	Count	Number of times the exception has occurred	-	INT	SUM
	message	Exception Message	Message returned when the exception has occurred	-	STRING	LAST
	stackTrace	Exception Stack	Exception stack information	-	CLOB	LAST