Need code to create the connection pool in java? Not sure what the question is but don’t create yet another connection pool, use an existing solution like C3P0, Apache DBCP, Proxool or BoneCP (a new player in that field). I would use C3P0. How does we make sure that connection pool doesn’t return the same … Read more
Warning: read ‘answer’ as ‘seems to make a difference’ I don’t see the issue happen if I change the controller block to look like: begin #… while true do t = Thread.new do #<<<<<<<<<<<<<<<<< ActiveRecord::Base.connection_pool.with_connection do |conn| #… end end t.join #<<<<<<<<<<<<<<<<< end #… rescue IOError #… But I don’t know whether this has actually … Read more
Purpose: Database connections are not thread safe; so ActiveRecord uses separate database connection for each thread. Limiting factor: Total database connections is limited by the database server you use (e.g Posgres: default is typically 100 or lesser), by your app server’s configuration (number of processes/threads available) and Active Record’s configuration : Connection Pool defaults to … Read more
Besides saving the overhead of connect & disconnect where this is otherwise done on each request, a connection pooler can funnel a large number of client connections down to a small number of actual database connections. In PostgreSQL, the optimal number of active database connections is usually somewhere around ((2 * core_count) + effective_spindle_count). Above … Read more
Found this thread researching a similar problem. I came up with the following sql as a good way to debug leaky connections in SQL Server: SELECT S.spid, login_time, last_batch, status, hostname, program_name, cmd, ( select text from sys.dm_exec_sql_text(S.sql_handle) ) as last_sql FROM sys.sysprocesses S where dbid > 0 and DB_NAME(dbid) = ‘<my_database_name>’ and loginame=”<my_application_login>” order … Read more
You haven’t configured the maxTotal size of the pool, and the default value is only 8. You could change the JedisFactory constructor to: public JedisFactory() { JedisPoolConfig poolConfig = new JedisPoolConfig(); poolConfig.setMaxTotal(128); jedisPool = new JedisPool(poolConfig, RedisDBConfig.HOST, RedisDBConfig.PORT, RedisDBConfig.TIMEOUT, RedisDBConfig.PASSWORD); } Beware also of the default value of the WhenExhaustedAction (WHEN_EXHAUSTED_BLOCK), as it may not … Read more
The easiest is to configure the connection pool to specify the query to be run to test the connection before it is passed to the application: validationQuery=”select 1 as dbcp_connection_test” testOnBorrow=true This same “connection validation” query can be run on other events. I’m not sure of the defaults for these: testOnReturn=true testWhileIdle=true There are also … Read more
BasicDataSource is, as the javadoc says, a one-stop shopping for basic needs. It has all the necessary. It creates internally a PoolableDataSource and an ObjectPool. PoolingDataSource implements the DataSource interface using a provided ObjectPool. PoolingDatasource take cares of whatever has to do with connections (casting, checking validity, setting properties, etc) and ObjectPool take cares of … Read more
After a lot of research, I am able to find 3 ways to log & monitor database connection pool. https://tomcat.apache.org/tomcat-8.0-doc/jdbc-pool.html Monitoring using Spring Boot properties. Monitoring using JMX ( Java Management Extensions ) (as @nitin suggested) Monitoring using Spring Aspects. 1st Way: Monitoring using Spring Boot properties. I found below Spring boot properties which will … Read more
I have spent recent days working on this so just want to share some “everyone-known” knowledges with you. First, as you are dealing with the same server, it is recommended to use a single HTTP client to execute your requests. With the help of PoolingHttpClientConnectionManager, your client can be used to execute multiple requests concurrently. … Read more