Would like to have the general query command to run against an Oracle 11g database that will provide me the system date and time for the database. I've used it before, but can't find it.
"select * from v$instance" does work, but at one time I thought it did. I'm using SQL Developer to run my queries and usually I have no problems with simple queries. I've obviously not typing my command correctly.
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Have you ever had to make fundamental changes to a table in Oracle, but haven't been able to get any downtime? I'm talking things like:
* Dropping columns
* Shrinking allocated space
* Removing chained blocks and restoring the PCTFREE
Composite queries are used to retrieve the results from joining multiple queries after applying any filters. UNION, INTERSECT, MINUS, and UNION ALL are some of the operators used to get certain desired results.
This video shows how to copy a database user from one database to another user DBMS_METADATA. It also shows how to copy a user's permissions and discusses password hash differences between Oracle 10g and 11g.