Jonathan Lewis wrote a series of posts on topic of Index ITLs (interested transaction list), how and when they become huge and make index bigger in size – see this post with links to several other articles. As it turned out in a recent thread on SQL.ru forum, one of possible solutions to the issue – calling ALTER index COALESCE – appears to be very limited in it’s appliance. Why? Because COALESCE doesn’t clean out ITLs of all index leaf blocks – most important, it doesn’t clean out ITL of the right-most index leaf block.
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