Database Administration (MOSC)

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Placing table in READ ONLY take hours

edited Oct 30, 2009 6:21AM in Database Administration (MOSC) 9 commentsAnswered
  Hi,

we have some table spaces (each of those table spaces are about 150 GB each) which we had to put in READ ONLY mode
Each one of those table spaces took a whopping 3 hours approximately to complete the command ' alter tablespace <table space name> read only'

Could you please explain as to what happens in the back ground when we put a table space in read only mode and why it takes such a long time to complete?

Thanks

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