changes from review

README.md

@@ -670,7 +670,7 @@ CancellationTokenSource cancellationTokenSource  = new CancellationTokenSource()
 Evict the Connection
 --------------------
 
-For the open connection, call the `PreventPooling()` to make the connection not return to the pool.
+For the open connection, call the `PreventPooling()` to mark the connection to be removed on close instead being still pooled.
 The busy sessions counter will be decreased when the connection is closed.
 
 Logging

Snowflake.Data.Tests/IntegrationTests/ConnectionPoolCommonIT.cs

@@ -119,7 +119,7 @@ public void TestFailWhenPreventingFromReturningToPoolNotOpenedConnection()
             var thrown = Assert.Throws<Exception>(() => connection.PreventPooling());
 
             // assert
-            Assert.That(thrown.Message, Does.Contain("Connection is not ready to prevent its session from returning to the pool"));
+            Assert.That(thrown.Message, Does.Contain("Session not yet created for this connection. Unable to prevent the session from pooling"));
         }
     }
 }

Snowflake.Data/Client/SnowflakeDbConnection.cs

@@ -113,11 +113,12 @@ public void PreventPooling()
                 throw new Exception("Session not yet created for this connection. Unable to prevent the session from pooling");
             }
             SfSession.SetPooling(false);
+            logger.Debug($"Session {SfSession.sessionId} marked not to be pooled any more");
         }
 
         internal bool HasActiveExplicitTransaction() => ExplicitTransaction != null && ExplicitTransaction.IsActive;
 
-        private bool ReleaseOrReturnSessionToPool()
+        private bool TryToReturnSessionToPool()
         {
             var pooling = SnowflakeDbConnectionPool.GetPooling() && SfSession.GetPooling();
             var transactionRollbackStatus = pooling ? TerminateTransactionForDirtyConnectionReturningToPool() : TransactionRollbackStatus.Undefined;
@@ -178,7 +179,7 @@ public override void Close()
             logger.Debug("Close Connection.");
             if (IsNonClosedWithSession())
             {
-                var returnedToPool = ReleaseOrReturnSessionToPool();
+                var returnedToPool = TryToReturnSessionToPool();
                 if (!returnedToPool)
                 {
                     SfSession.close();
@@ -210,7 +211,7 @@ public virtual Task CloseAsync(CancellationToken cancellationToken)
             {
                 if (IsNonClosedWithSession())
                 {
-                    var returnedToPool = ReleaseOrReturnSessionToPool();
+                    var returnedToPool = TryToReturnSessionToPool();
                     if (returnedToPool)
                     {
                         _connectionState = ConnectionState.Closed;

Snowflake.Data/Core/Session/SessionPool.cs

@@ -391,10 +391,17 @@ private Task<SFSession> NewSessionAsync(String connectionString, SecureString pa
         internal void ReleaseBusySession(SFSession session)
         {
             s_logger.Debug("SessionPool::ReleaseBusySession");
+            int currentPoolSize;
             lock (_sessionPoolLock)
             {
                 _busySessionsCounter.Decrease();
+                currentPoolSize = GetCurrentPoolSize();
             }
+            var currentSizeMessageOldPool = $"After releasing a busy session from the pool, the pool size is: {currentPoolSize}";
+            var poolSizeMessage = IsMultiplePoolsVersion()
+                ? $"{currentSizeMessageOldPool} - pool identified by: {ConnectionString}"
+                : currentSizeMessageOldPool;
+            s_logger.Debug(poolSizeMessage);
         }
 
         internal bool AddSession(SFSession session, bool ensureMinPoolSize)