diff --git a/src/main/java/com/avaje/ebean/config/dbplatform/DatabasePlatform.java b/src/main/java/com/avaje/ebean/config/dbplatform/DatabasePlatform.java
index 952e71b51..cd243e4e4 100644
--- a/src/main/java/com/avaje/ebean/config/dbplatform/DatabasePlatform.java
+++ b/src/main/java/com/avaje/ebean/config/dbplatform/DatabasePlatform.java
@@ -33,12 +33,6 @@ public class DatabasePlatform {
      */
     ROLLBACK,
 
-    /**
-     * Just close the transaction. Valid at READ_COMMITTED isolation and preferred on some Databases
-     * as a performance optimisation.
-     */
-    CLOSE,
-
     /**
      * Commit the transaction
      */
diff --git a/src/main/java/com/avaje/ebeaninternal/server/transaction/ExplicitTransactionManager.java b/src/main/java/com/avaje/ebeaninternal/server/transaction/ExplicitTransactionManager.java
index c93d4a592..1a6134703 100644
--- a/src/main/java/com/avaje/ebeaninternal/server/transaction/ExplicitTransactionManager.java
+++ b/src/main/java/com/avaje/ebeaninternal/server/transaction/ExplicitTransactionManager.java
@@ -44,11 +44,7 @@ public class ExplicitTransactionManager extends TransactionManager {
       return DatabasePlatform.OnQueryOnly.valueOf(systemPropertyValue.trim().toUpperCase());
     }
 
-    if (DatabasePlatform.OnQueryOnly.CLOSE.equals(dbPlatformOnQueryOnly)) {
-      // Not using OnQueryOnly.CLOSE with ExplicitJdbcTransaction
-      return DatabasePlatform.OnQueryOnly.COMMIT;
-    }
-    // default to commit if not defined on the platform
-    return dbPlatformOnQueryOnly == null ? DatabasePlatform.OnQueryOnly.COMMIT : dbPlatformOnQueryOnly;
+    // default to rollback if not defined on the platform
+    return dbPlatformOnQueryOnly == null ? DatabasePlatform.OnQueryOnly.ROLLBACK : dbPlatformOnQueryOnly;
   }
 }
diff --git a/src/main/java/com/avaje/ebeaninternal/server/transaction/JdbcTransaction.java b/src/main/java/com/avaje/ebeaninternal/server/transaction/JdbcTransaction.java
index 1cc759447..75ad78b5f 100644
--- a/src/main/java/com/avaje/ebeaninternal/server/transaction/JdbcTransaction.java
+++ b/src/main/java/com/avaje/ebeaninternal/server/transaction/JdbcTransaction.java
@@ -860,26 +860,14 @@ public class JdbcTransaction implements SpiTransaction {
   }
 
   /**
-   * Rollback, Commit or Close for query only transaction.
-   * <p>
-   * For a transaction that was used for queries only we can choose to either
-   * rollback or just close the connection for performance.
-   * </p>
+   * Rollback or Commit for query only transaction.
    */
   protected void connectionEndForQueryOnly() {
     try {
-      switch (onQueryOnly) {
-        case ROLLBACK:
-          performRollback();
-          break;
-        case COMMIT:
-          performCommit();
-          break;
-        case CLOSE:
-          // valid at READ COMMITTED Isolation
-          break;
-        default:
-          performRollback();
+      if (onQueryOnly == OnQueryOnly.COMMIT) {
+        performCommit();
+      } else {
+        performRollback();
       }
     } catch (SQLException e) {
       logger.error("Error when ending a query only transaction via " + onQueryOnly, e);
diff --git a/src/main/java/com/avaje/ebeaninternal/server/transaction/TransactionManager.java b/src/main/java/com/avaje/ebeaninternal/server/transaction/TransactionManager.java
index 47abc01b5..dc1402503 100644
--- a/src/main/java/com/avaje/ebeaninternal/server/transaction/TransactionManager.java
+++ b/src/main/java/com/avaje/ebeaninternal/server/transaction/TransactionManager.java
@@ -192,51 +192,10 @@ public class TransactionManager {
       return OnQueryOnly.valueOf(systemPropertyValue.trim().toUpperCase());
     }
 
-    if (OnQueryOnly.CLOSE.equals(dbPlatformOnQueryOnly)) {
-      // check for read committed isolation level
-      if (!isReadCommittedIsolation(ds)) {
-        logger.warn("Ignoring DatabasePlatform.OnQueryOnly.CLOSE as the transaction Isolation Level is not READ_COMMITTED");
-        // we will just use ROLLBACK and ignore the desired optimisation
-        return OnQueryOnly.ROLLBACK;
-      } else {
-        // will use the OnQueryOnly.CLOSE optimisation
-        return OnQueryOnly.CLOSE;
-      }
-    }
     // default to rollback if not defined on the platform
     return dbPlatformOnQueryOnly == null ? OnQueryOnly.ROLLBACK : dbPlatformOnQueryOnly;
   }
 
-  /**
-   * Return true if the isolation level is read committed.
-   */
-  protected boolean isReadCommittedIsolation(DataSource ds) {
-
-    if (DbOffline.isSet()) {
-      return true;
-    }
-    Connection c = null;
-    try {
-      c = ds.getConnection();
-
-      int isolationLevel = c.getTransactionIsolation();
-      return (isolationLevel == Connection.TRANSACTION_READ_COMMITTED);
-
-    } catch (SQLException ex) {
-      String m = "Errored trying to determine the default Isolation Level";
-      throw new PersistenceException(m, ex);
-
-    } finally {
-      try {
-        if (c != null) {
-          c.close();
-        }
-      } catch (SQLException ex) {
-        logger.error("closing connection", ex);
-      }
-    }
-  }
-
   public String getServerName() {
     return serverName;
   }