http://iadviseblog.wordpress.com/2008/05/29/how-to-reformat-the-highwatermark-of-a-table-after-a-delete/ Building applications using the Oracle Technology stack Wed, 27 Mar 2013 02:33:33 +0000 hourly 1 http://wordpress.com/ http://iadviseblog.wordpress.com/2008/05/29/how-to-reformat-the-highwatermark-of-a-table-after-a-delete/#comment-430 Sun, 01 Jun 2008 20:51:00 +0000 http://iadviseblog.wordpress.com/2008/05/29/how-to-reformat-the-highwatermark-of-a-table-after-a-delete#comment-430 Jens,You are absolutely right, I have changed the blog post.Thank you for pointing me on this misunderstanding!Frederik

]]> http://iadviseblog.wordpress.com/2008/05/29/how-to-reformat-the-highwatermark-of-a-table-after-a-delete/#comment-429 Fri, 30 May 2008 10:42:00 +0000 http://iadviseblog.wordpress.com/2008/05/29/how-to-reformat-the-highwatermark-of-a-table-after-a-delete#comment-429 I think you are mixing things up a bit:The HighWaterMark (HWM) has not got to with the index, but is for the table itself. A full tablescan will read all blocks up to the HWM, whether there are rows in the blocks or not. You are correct in that the best way of clearing out is to use “alter table tablename shrink space”. The drawback is however that subsequent insert statements will have to reallocate these blocks. So you need to check the usage of the table before adding this costly operation to all of your delete procedures.Just my 2 cents..Jens

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