RE: coalesce tablespace

From: Mohammad Rafiq <rafiq9857_at_hotmail.com>
Date: Thu, 20 Sep 2001 13:04:29 -0700
Message-ID: <F001.0039420E.20010920125053@fatcity.com>

Following script may be used to check whether coalesing is required or not. If lasr column not 100% then coalesce that tbs....

select substr(tablespace_name,1,10)TS_NAME,total_extents "Total_Extnts",extents_coalesced,round(percent_extents_coalesced,0) from dba_free_space_coalesced
/

MOHAMMAD RAFIQ Reply-To: ORACLE-L_at_fatcity.com
To: Multiple recipients of list ORACLE-L <ORACLE-L_at_fatcity.com> Date: Thu, 20 Sep 2001 12:21:21 -0800

It would take contiguous free extents and make them larger extents, which would be more likely to reuse. Especially if there are many smaller ones, this moot if using LMT.

It is a very quick procedure and good to do occasional, you can check in dba_data_files_coalesced to see if the number is far from 100%, if it is less than 75% or so, just throw a coalesce on the tablespace.

"Do not criticize someone until you walked a mile in their shoes, that way when you criticize them, you are a mile a way and have their shoes."

Christopher R. Spence
Oracle DBA
Phone: (978) 322-5744
Fax: (707) 885-2275

Fuelspot
73 Princeton Street
North, Chelmsford 01863

-----Original Message-----

Sent: Thursday, September 20, 2001 3:40 PM To: Multiple recipients of list ORACLE-L

We have tablespaces in acceptance and production that are being resized for growth. Pctincrease is set at 0. Would it also help to coalesce the tablespace? What are the benefits of this command? Thanks,
Sandi

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Author: Mohammad Rafiq
  INET: rafiq9857_at_hotmail.com

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