I tried to match the current existing methods, to help one match the pairs. But "org.hibernate.engine.transaction.spi.AbstractTransactionImpl" has a doBegin method. Isn't it called when the transaction starts? On Tuesday, June 2, 2015 5:11 PM, Steve Ebersole <steve(a)hibernate.org&gt; wrote: start() I assume is supposed to indicate Session start? That is a possibility. transactionStart() is not. We do not always know when a transaction starts. On Tue, Jun 2, 2015 at 1:23 AM Mihalcea Vlad <mih_vlad(a)yahoo.com&gt; wrote: Thanks. The second one is on the master branch and the 5.0 code-base. Can the SessionEventListener have two more methods: public void start(); public void transactionStart(); So we can monitor how long the Session (start() and end() pair) and Transactions take (transactionStart() and transactionCompletion()). Vlad On Tuesday, June 2, 2015 4:39 AM, Steve Ebersole <steve(a)hibernate.org&gt; wrote: Hibernate already has hooks to implement all of these between org.hibernate.SessionEventListener and org.hibernate.resource.jdbc.spi.StatementInspector On Mon, Jun 1, 2015 at 4:12 PM Mihalcea Vlad <mih_vlad(a)yahoo.com&gt; wrote: Hi Steve, I was thinking of having a Metrics gathering API for all sorts of database-related operations: - connection acquiring/lease time - connection wait time - transaction durations - SQL query logger - slow queries threshold - number of queries per transaction threshold Something similar to https://github.com/vladmihalcea/flexy-pool This will ease profiling a Hibernate application and we could have the hibernate-core define the integration hooks and a hibernate-metrics module to inject the metrics gathering components. This module could use Dropwizard Metrics, since it supports various Reservoir types and many reporting flavors (log, JMX, Graphite). Hibernate users will get an insight of what's going on in their application, so they can better understand what Hibernate does on their behalf. What do you think of this? Vlad MIhalcea