readme

Author: nigelbayliss

optimizer/histogram_history/partitioned/README.md

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+<h2>List history information for histograms associated with a partitioned table</h2>
+
+This is a proof-of-concept script to list information on histogram changes over time for a given table. In particular, it reports: 
+
+-  Changes to histogram bucket counts.
+-  When histograms were added and removed for each table column.
+
+The main script is "h_phist.sql". 
+
+It requires a DBA account and you supply two parameters:
+
+<pre>
+SQL> @h_phist table_name user_name       [If the user_name is 'USER', the current username will be assumed]
+</pre>
+
+For a worked example, see spool file example.lst and a test script example.sql
+
+WARNING: The example.sql script will drop a table called SALES. Always use test databases.
+
+DISCLAIMER:
+   <br/>-- These scripts are provided for educational purposes only.
+   <br/>-- They are NOT supported by Oracle World Wide Technical Support.
+   <br/>-- The scripts have been tested and they appear to work as intended.
+   <br/>-- You should always run scripts on a test instance.
+