Documentation.

h2/src/docsrc/html/advanced.html

@@ -77,7 +77,7 @@ Advanced
 
 <h3>Statements that Return a Result Set</h3>
 <p>
-The following statements return a result set: <code>SELECT, EXPLAIN, CALL, SCRIPT</code>.
+The following statements return a result set: <code>SELECT, EXPLAIN, CALL, SCRIPT, SHOW, HELP</code>.
 All other statements return an update count.
 </p>
 

h2/src/docsrc/html/features.html

@@ -1180,7 +1180,8 @@ open, one of them will then start a server (auto-reconnect is enabled automatica
 </p>
 <p>
 All processes need to have access to the database files.
-If the first connection is closed (the connection that started the server), open transactions of other connections will be rolled back.
+If the first connection is closed (the connection that started the server), open transactions of other connections will be rolled back
+(this may not be a problem if you don't disable autocommit).
 Explicit client/server connections (using <code>jdbc:h2:tcp://</code> or <code>ssl://</code>) are not supported.
 This mode is not supported for in-memory databases.
 </p>

h2/src/docsrc/html/performance.html

@@ -351,6 +351,13 @@ profiler.startCollecting();
 profiler.stopCollecting();
 System.out.println(profiler.getTop(3));
 </pre>
+<p>
+The profiler is built into the H2 Console tool, to analyze databaseses that open slowly.
+To use it, run the H2 Console, and then click on 'Test Connection'. 
+Afterwards, click on "Test successful" and you get the most common stack traces, 
+which helps to find out why it took so long to connect. You will only get the stack traces
+if opening the database took more than a few seconds.
+</p>
 
 <h2 id="database_profiling">Database Profiling</h2>
 <p>

h2/src/docsrc/html/roadmap.html

@@ -471,7 +471,7 @@ See also <a href="build.html#providing_patches">Providing Patches</a>.
 </li><li>Implement GiST (Generalized Search Tree for Secondary Storage).
 </li><li>Function to read a number of bytes/characters from an BLOB or CLOB.
 </li><li>Issue 156: Support SELECT ? UNION SELECT ?.
-</li><li>Automatic mixed mode: support a port range list (to avoid firewall problems)
+</li><li>Automatic mixed mode: support a port range list (to avoid firewall problems).
 </li></ul>
 
 <h2>Not Planned</h2>

h2/src/main/org/h2/constant/ErrorCode.java

@@ -1268,9 +1268,14 @@ public class ErrorCode {
     public static final int CANNOT_DROP_LAST_COLUMN = 90084;
 
     /**
-     * The error with code <code>90085</code> is thrown when trying to
-     * manually drop an index that was generated by the system because of a
-     * unique constraint.
+     * The error with code <code>90085</code> is thrown when
+     * trying to manually drop an index that was generated by the system
+     * because of a unique or referential constraint. To find out what
+     * constraint causes the problem, run:
+     * <pre>
+     * SELECT * FROM INFORMATION_SCHEMA.CONSTRAINTS
+     * WHERE UNIQUE_INDEX_NAME = '&lt;index name&gt;';
+     * </pre>
      * Example of wrong usage:
      * <pre>
      * CREATE TABLE TEST(ID INT, CONSTRAINT UID UNIQUE(ID));