Peter Ramm's Oracle performance analysis stuff

If you find this message “ ORA-1652: unable to extend temp segment ” in alert.log there are two alternatives for reason: The session causing the ORA-1652 has allocated large memory in temporary tablespace itself and got ORA-1652 at the end of available space  Other sessions did successfully allocate large amount of memory in temp tablespace but this session with only small demand got ORA-1652  But how to identify the session that really claimed large amounts in temporary tablespace and therefore is responsible for the ORA-1652? With Panorama you can clarify this as follows: Go to menu “Schema / Storage” / “Temp usage” / “Historic”. Choose the concerning period and appropriate time unit.  Sort table by column “Max. TEMP allocated”  Show column “Max. TEMP allocated” in diagram via context menu click in column and select “Show column in diagram”  Now let’s check the temp usage peak at 00:10. One of several ways to identify the sessions caus...

You recognize a long running query caused by poor execution plan. You also know that until yesterday this query worked fine but now execution plan has suddenly changed due to ???. Filipe Martins named a solution here by transferring a good execution plan from AWR history into a SQL plan baseline. This solution is available in Panorama now. It allows you to quickly generate a SQL snippet for creation of SQL plan baseline by simple button click. Steps to fix this issue: Identify the problematic query, open SQL details page in Panorama for this statement. For example via menu “SGA/PGA details” / “SQL Area” / “Current” Hit button “Complete time line of SQL” at the bottom of the SQL details page Identify a day (or hour/minute) in history in the list with exactly one good execution plan. Column “Elapsed/Execution” may help you to rate the quality. Column “Plan hash value” allows you to differentiate different plans. Click the link in column “Start time” to open SQL de...

In menu ‘Spec. additions’ / ‘Dragnet investigation’ now you have the opportunity to add your own personal SQL-statements to the predefined list of dragnet SQLs. This SQLs are stored at Panorama’s server instance and are available for your personal browser instance only. Choose ‘Add personal selection’ from menu ‘≡’ and customize the JSON template for your purpose. You will get a new menu ‘Personal extensions’ in your list of SQLs then. If you want to persist this SQLs and provide them to all users of your Panorama instance, you can store them as JSON-array in a file ‘predefined_dragnet_selections.json’ stored at PANORAMA_VAR_HOME. The content of file ‘predefined_dragnet_selections.json’ is shown in list of dragnet SQLs if it exists in   PANORAMA_VAR_HOME directory. Click here to show all opportunities for your personal or global extensions to dragnet list.