I have a java program which updates a table in oracle database.
I have tried it using a single JDBC connection and it's very slow and takes hours to complete.
I'm trying to use HikariCP to make a connection pool and have multiple threads get separate connections from the pool.
Suppose I have 6 threads and 5 database connections in the pool and 5 of the threads call the HikariDataSource.getConnection() method. Will each of them get a separate db connection object?
If yes, then, will the thread be in blocked/ waiting state, when it calls the getConnection method or it executes the remaining code with a null connection?
If no, how do I get them separate connections?
Will each of them get a separate db connection object?
Each thread ask connection, if available gets a separate db connection object
If yes, then, will the thread be in blocked/ waiting state, when it calls the getConnection method or it executes the remaining code with a null connection?
If no available connection it will wait until connection is released to pool and take it, if it won't get connection until timeout defined, it will throw a timeout exception
If no, how do I get them separate connections?
Irrelevant, because each thread will get different connection
About HikariCP and concurrency:
HikariCP contains a custom lock-free collection called a ConcurrentBag. The idea was borrowed from the C# .NET ConcurrentBag class, but the internal implementation quite different. The ConcurrentBag provides...
- A lock-free design
- ThreadLocal caching
- Queue-stealing
- Direct hand-off optimizations
...resulting in a high degree of concurrency, extremely low latency, and minimized occurrences of false-sharing.