JMeter uses JDBC to perform database pressure test

The background that

In addition to the full link voltage measurement, the voltage measurement , Sometimes you need to test the performance of a specified service , Here we use jmeter The tool describes the pressure test of the database .

Different database drivers need to be installed for different databases of pressure test , Here we use mysql As an example for pressure measurement .

Step one ： Database driver installation

1. Get into mysql Official website , According to the different mysql Download the corresponding database driver mysql-connector-java, download mysql-connector-java, Refer to the following figure for the corresponding version ：

2. Download the compressed package according to your own operating system

3. Unzip after download , find mysql-connector-java-xxx.jar Of jar package , hold jar Put the bag in jmeter Under the installation path lib Under the directory , Then open the jmeter application

Step two ：JDBC Connection Configuration To configure

Add one JDBC Connection Configuration, test plan -> add to -> The configuration element ->JDBC Connection Configuration, Used to connect to the database .

Variable Name Bound to pool

Database connection pool configuration

Configuration item	explain
Variable Name for created pool	The name of the database connection pool , Fill in the variable name , and JDBC request Medium Variable Name Binding

Connection pool Configuration

Connection pool parameter configuration , Basically keep the default , It can be modified as needed

Configuration item	explain
Max Number of Connection	Maximum number of database links , It can be set to 0, This means that each thread uses a separate database connection , Database connections between threads are not shared
Max Wait (ms)	The maximum waiting time to retrieve a connection in the connection pool
Time Between Eviction Runs(ms)	Thread idle time if a connection in the current connection pool is idle time Between Eviction Runs Millis Time is still unused , Is physically closed
Auto Commit	Automatic submission sql sentence
Read timeout（ms）	Timeout waiting for server response
Transaction isolation	Transaction isolation level , There are mainly the following options ：（ Yes JMX encryption ） TRANSACTION_NODE Transaction node 、TRANSACTION_READ_UNCOMMITTED Transaction uncommitted read 、TRANSACTION_READ_COMMITTED Transaction committed read 、TRANSACTION_SERIALIZABLE Transaction serialization 、DEFAULT Default 、TRANSACTION_REPEATABLE_READ Transaction repeat read
Preinit Pool	Initialize the connection pool immediately if it is False, Is the first JDBC The response time of the request will be longer , Because it includes the time when the connection pool is established

Connection Validation by Pool

Verify that the connection pool can respond

Configuration item	explain
Test While Idle	Test for disconnection when the connection is idle
Soft Min Evictable Idle Time(ms)	The minimum time a connection is idle in the pool , The default value is 5000(5 second )
Validation Query	A simple query , Used to determine whether the database is still responding

Database Connection Configuration

Database connection configuration

Configuration item	explain
Database URL	Database connection URL, See note for details 1
JDBC Driver class	database JDBC Driver class name , Select the data driver of the corresponding database
Username	Database login user name
Password	Database login password
Connection Properties	Connection properties to be set when establishing a connection

notes 1:Database URL: jdbc:mysql:// Server address :3306/ Database name （ such as ：jdbc:mysql://ip:3306/ Database name ?useUnicode=true&characterEncoding=utf8&allowMultiQueries=true. among &allowMultiQueries=true Indicates that multiple... Are allowed sql）

Step three ：JDBC Request To configure

Add after the database connection configuration is completed JDBC Request, Thread group -> add to -> Sampler ->JDBC Request, Used to deal with JDBC request

Variable Name Bound to pool

Database connection pool configuration

Configuration item	explain
Variable Name for pool declared in JDBC Connection Configuration	The name of the database connection pool , and JDBC Connection Configuration Of Variable Name for created pool Keep the name the same

SQL Query

sql sentence , Take query as an example

Configuration item	explain
Query Type	sql Statement type , The statement here selects select statement, According to the actual test sql Choose
Query	Completed sql sentence , Use... Between multiple statements ; Division , Do not add... At the end of the statement ;
JDBC Request	Value to transfer
Parameter types	Type of transmitted value
Variable names	sql Execution result variable name
Result variable names	All results are stored as an object
Query timeouts(s)	Query timeout
Limit Result Set	Limit sql Statement returns the number of rows in the result set
Handle Result Set	How to define callable statements The result set returned ; The default is stored as a string

Step four ： Script execution

Add view result tree , Thread group -> add to -> Monitor -> View the result tree , Follow the steps above to JDBC Connection Configuration and JDBC Request After editing , Click the start button at the top of the page , Run script .

Check the result tree to see if the script is working properly . In the left navigation tree , Select view result tree , Check whether the request results meet the expectations . If the request fails or the result is not as expected , Need to readjust the script or SQL sentence .