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Getting resources from the backend is an expensive operation. WebSphere Application Server connection pooling plays a vital roles in this. This blog contains helpful information on how connection pooling works and how to troubleshoot.
This technote explains why and how the Local transaction containment (LTC) is created, as well as when to switch the connection sharing.https://www.ibm.com/support/pages/node/64470152) Tuning Connection Pool Properties In WebSphere Application ServerThis blog explains when to increase or decrease the connection pooling size.https://www.ibm.com/support/pages/tuning-connection-pool-properties-websphere-application-server
3) Understanding StaleConnectionExceptionsThis document explains why and when you may experience StaleConnectionExceptions and how to resolve them.https://www.ibm.com/support/pages/node/1081179
4) Understanding and Resolving J2CA0045E or Connection Timeout issues in WebSphere Application Server Great webcast helps you understand and resolve the most common Connection Timeout issue.https://www.ibm.com/support/pages/webcast-replay-understanding-and-resolving-connectionwaittimeout-exceptions-websphere-application-server
5) Understanding J2C Connection Pooling in WebSphere Application ServerExplains how the Connection pooling works in WAS.https://www.ibm.com/support/pages/webcast-replay-understanding-j2c-connection-pooling-websphere-application-server
6) What are the differences between shared and unshared connections?Good document explains the difference between shared and unshared connections.https://www.ibm.com/support/pages/questions-related-shared-and-unshared-database-connections
7)Connection pool property defaultConnectionTypeOverride and globalConnectionTypeOverride to change the Shared to unshared connection
This document explains ho to override the connection behavior from unshared to shared https://www.ibm.com/docs/en/was/9.0.5?topic=pools-connection-pool-custom-properties8) How to Tune Connection PoolingGreat IBM TV session explains basic connection pooling properties and how to tune the connection properties using the Tivoli Performance Viewer (TPV) load testing.https://techtv.bemyapp.com/#/conference/6143e2a8d8d8ca001c10aecf
9) How to troubleshoot J2CA0045E connection pooling problemsStep by step instructions on how to troubleshoot J2CA0045E issues.https://www.ibm.com/support/pages/node/387441
10) Securing JDBC Connections in Open Liberty & WebSphere LibertyIBM TV show explains how you can secure your backend (SSL/TLS) in Liberty.https://techtv.bemyapp.com/#/conference/61b4482598870300311bc292
11) Securing JDBC Connections in Traditional WebSphereIBM TV show explains how you can secure your backend (SSL/TLS) in traditional WAS.https://techtv.bemyapp.com/#/conference/61b444eb98870300311bc27f
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