1

In my Oracle database, I have a number of schemas (users/owners) with similar table structures (about 100 in total). However, some tables are empty in a lot of schemas. Is there a way to find out for which schemas a table (with a particular name, which will be the same across all the queried schemas) has records/rows?

Is there a view in Oracle which contains all records? For example, if I am looking for columns, I can search ALL_TAB_COLUMNS; if I am searching for tables, I can look in DBA_TABLES or ALL_OBJECTS. Is there an equivalent for records?

This would also be helpful for another query - to find all tables (of a given name) across all schemas, where a particular field has a non-null value in at least one record.

2

DBA_TABLES.NUM_ROWS column can be used to identify tables that are empty. But this column is updated by DBMS_STATS, so it is not 100% accurate.

There is no view that contains all records.

  • Note: From Oracle version 10g DBMS_STATS will be executed automatically but it may take some hours until a new table would be analyzed. – ora-600 Jan 16 '15 at 17:51
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There is no table or view that is the equivalent for records. You could achieve this by generating dynamic SQL in a PL/SQL script to produce selects against each table and then run each generated SQL using 'execute immediate'. Unfortunately I don't have the time to write up a quick script at the minute as I'm still at work.

  • This is probably the slowest method. If you choose do this, check laurentschneider.com/wordpress/2007/04/…, it could be helpful. – Raj Jan 15 '15 at 17:05
  • @Raj. Thanks for that link. I'll have a play around with that type of method when I get 5 minutes – BriteSponge Jan 16 '15 at 8:55
  • This answer is not correct. Refer to what sjk wrote. – ora-600 Jan 16 '15 at 17:47
  • Not sure why a downvote as what I have said is certainly possible and would satisfy the OP requirement. The answer by sjk does not seem to indicate why my answer is incorrect. – BriteSponge Jan 19 '15 at 12:10

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