Fix issue with UPGR database failing to register with listener (#543)

* Initial changes

* Acknowledgements

* Lab 10 - first edition

* Start lab 11 plus lab 10 fixes

* Lab 11, final changes

* Lab 11 minor text changes

* Lab 11 - restart source post-migration

* Lab 12

* Small stuff

* Lab 12

* Missing     ```

* Lab 13

* Labs 3-5 update

* Update autoupgrade.md

* Labs 3-9

* Lab 15 downgrade

* Lab 14 glitches

* Changed release dates

* Lab 14 - part 1

* Changing contributors

* Trim spaces

* Page changes

* Update awr-compare.md

* Update spa.md

* Lab 14

* Update encrypted-db-upg-conv.md

* Minor corrections

* Lab 02 errors

* Changes

* Error fixing

* Get rid of EXPORT and use env script

* Lab 7

* More fixes

* Missing exit in lab 14

* Image pptx

* Fixing underscores

* underscores

* Small

* Lab 8 finalize

* Lab 9

* Lab 00

* Dummy change

* Test change

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* Changes from Klaus + Alex

* Klaus changes

* Image error

* Delete ~$images.pptx

* New workshops

* Mikes changes

* Small change

* Fix issue with UPGR starting too fast and failing to register at listener

---------

Co-authored-by: Rodrigo Jorge <rodrigoaraujorge@hotmail.com>

hitchhikers-guide-upgrade-to-23ai/01-initialize-environment/initialize-environment.md

@@ -58,7 +58,7 @@ In this lab, you will:
         - UPGR
         - CDB23
 
-3. Ensure the listener is started.
+2. Ensure the listener is started.
 
     ```
     <copy>
@@ -74,7 +74,7 @@ In this lab, you will:
     ```
     </details>
 
-4. Ensure that the databases (*FTEX*, *UPGR* and *CDB23*) are started.
+3. Ensure that the databases (*FTEX*, *UPGR* and *CDB23*) are started.
 
     ```
     <copy>
@@ -92,6 +92,33 @@ In this lab, you will:
     ```
     </details>
 
+4. Occasionally, the *UPGR* database fails to register with the listener. Set the environment and connect to *UPGR*.
+
+    ```
+    <copy>
+    . upgr
+    sqlplus / as sysdba
+    </copy>
+
+    -- Be sure to hit RETURN
+    ```
+
+5. Restart *UPGR*.
+
+    ```
+    <copy>
+    startup force
+    </copy>
+    ```
+
+6. Exit SQL*Plus.
+
+    ```
+    <copy>
+    exit
+    </copy>
+    ```
+
 You may now *proceed to the next lab*.
 
 ## Acknowledgements

hitchhikers-guide-upgrade-to-23ai/03-awr-snapshot/awr-snapshot.md

@@ -195,6 +195,8 @@ When you migrate databases, preserving the AWR is important. When you upgrade, t
     . upgr
     sqlplus / as sysdba
     </copy>
+
+    -- Be sure to hit RETURN
     ```
 
 2. In `rdbms/admin` in your Oracle Home, you find a script to export AWR. Use the script to start the export. It runs for around two minutes.