connection-pooling

问题 I was wondering if I can run multiple c3p0 datasources for one DB, something like: <bean id="dataSource1" class = "com.mchange.v2.c3p0.ComboPooledDataSource" destroy-method="close"> <property name="driverClass" value="${db.driverClassName}"/> <property name="jdbcUrl" value="${db.url}/schema1"/> <property name="user" value="${db.username}"/> <property name="password" value="${db.password}"/> <property name="acquireIncrement" value="1" /> <property name="idleConnectionTestPeriod" value="100"/>

问题 Why am I not able to create a JDBC Connection Pool in GlassFish 5.0? I want connect to MySQL server. I created connection pool by guide, but nothing is working. I used Resource type: java.sql.DataSource Driver class name: com.mysql.cj.jdbc.MysqlDataSource [2018-07-17T15:45:15.500+0300] [glassfish 5.0] [WARNING] [test.connection.pool.failed [javax.enterprise.resource.resourceadapter.com.sun.enterprise.connectors.service] [tid: _ThreadID=45 _ThreadName=admin-listener(4)] [timeMillis:

问题 I have changed my code version from http to https and I am using HttpClient client = HttpClientFactory.getHttpsClient() for execution purposes. When I am trying to run my code for the first time it is running fine and next time is throwing the exception java.lang.IllegalStateException: Connection pool shut down exception I am using 4.5HC. 回答1: Do not close your client after a request if you are pooling the connections. That is, you are probably doing something like this:

问题 We know lambdas are charged by the execution time. So now I want to connect to SQL Server DB from lambda. If I create a connection in each lambda, it would be heavy for lambda. Is there any best way to maintain my SQL connections alive in one place and will be able to use across my all lambdas. Or at least alive for one lambda for multiple executions. I know, lambdas should be treated like stateless, but still, I am looking for a better solution for this issue. I have searched over many sites

问题 I'm using HikariCP 2.4.7 for connection pool. Everything is fine just after starting the application but after some time without invoking getConnection() I get this error when I'm trying to getConnection() : java.sql.SQLTransientConnectionException: HikariPool-1 - Connection is not available, request timed out after 42734ms. at com.zaxxer.hikari.pool.HikariPool.createTimeoutException(HikariPool.java:555) at com.zaxxer.hikari.pool.HikariPool.getConnection(HikariPool.java:188) at com.zaxxer

问题 I'm trying to get a handle on whether we have a problem in our application with database connections using incorrect IsolationLevels. Our application is a .Net 3.5 database app using SQL Server 2005. I've discovered that the IsolationLevel of connections are not reset when they are returned to the connection pool (see here) and was also really surprised to read in this blog post that each new TransactionScope created gets its own connection pool assigned to it. Our database updates (via our

问题 I'm trying to get a handle on whether we have a problem in our application with database connections using incorrect IsolationLevels. Our application is a .Net 3.5 database app using SQL Server 2005. I've discovered that the IsolationLevel of connections are not reset when they are returned to the connection pool (see here) and was also really surprised to read in this blog post that each new TransactionScope created gets its own connection pool assigned to it. Our database updates (via our

问题 I am using Redis to store two databases : 0 and 1 via the Redis-py client library. I would like to create two connections for each database. Currently, I am doing this : >>> connection0 = redis.Connection(host = 'localhost', port = 6379, db = 0) >>> connection1 = redis.Connection(host = 'localhost', port = 6379, db = 1) >>> connection0.connect() However, I don't seem to find a way to create a Redis object from the connection. >>> store0 = redis.Redis(connection0) >>> store0.info() Traceback

问题 I'm in charge of developing and maintaining a group of Web Applications that are centered around similar data. The architecture I decided on at the time was that each application would have their own database and web-root application. Each application maintains a connection pool to its own database and a central database for shared data (logins, etc.) A co-worker has been positing that this strategy will not scale because having so many different connection pools will not be scalable and that

问题 I've got a windows service that regulary (every 10 sec) does a lot of db activity. I've verified that all my connections are closed (using using). After some time (days or hours) I get this error: Timeout expired. The timeout period elapsed prior to obtaining a connection from the pool. This may have occured because all pooled connections were in use and max pool size was reached. I found that I should check the sysprocesses table, and found that it is creating lots of new entries when my