Top 10 - Biggest Tables and Indexes

Top 10 - Biggest Tables and Indexes

set lines 170
set pages 20
col owner      format a20
col object     format a30
col type       format a6
col tablespace format a20
col size_in_gb format 999,999.9
select * 
  from (select owner           owner,
               segment_name    object,
               segment_type    type,
               tablespace_name tablespace,
               round(bytes/1024/1024/1024,1) size_in_gb
          from dba_segments 
         where owner not in ('SYS','SYSTEM')
         order by bytes desc
       ) 
 where rownum < 11
 order by size_in_gb desc;

Reading ASM Disk Header

How to Read an ASM Disk Header

As root,

/u01/app/11.2.0/grid/bin/kfed read /dev/mapper/mydisk1|egrep "(dsksize|provstr|dskname|grpname|fgname)"

kfdhdb.driver.provstr:  ORCLDISKMYDISK1 ; 0x000: length=15

kfdhdb.dskname:                 MYDISK1 ; 0x028: length=7

kfdhdb.grpname:               MYDISKGROUP ; 0x048: length=9

kfdhdb.fgname:                  MYDISK1 ; 0x068: length=7

kfdhdb.dsksize:                  524294 ; 0x0c4: 0x00080006

To list all ASM devices using blkid:

blkid|grep sd.*oracleasm|while read a b;do echo -n $a$b" scsi_id=";(echo $a|tr -d [:digit:]|tr -d [:]|cut -d"/" -f3|xargs -i scsi_id -g -s /block/{})done;

How FULL are the BLOCKS in my TABLE?

Table Block Space Usage:

set serveroutput on size 100000
declare
 v_unformatted_blocks number;
 v_unformatted_bytes number;
 v_fs1_blocks number;
 v_fs1_bytes number;
 v_fs2_blocks number;
 v_fs2_bytes number;
 v_fs3_blocks number;
 v_fs3_bytes number;
 v_fs4_blocks number;
 v_fs4_bytes number;
 v_full_blocks number;
 v_full_bytes number;
 begin
  dbms_space.space_usage (
   '&TABLEOWNER',        --object owner
   '&TABLENAME',         --object name
   'TABLE',              --object type TABLE, INDEX, or "TABLE PARTITION" 
   v_unformatted_blocks,
   v_unformatted_bytes,
   v_fs1_blocks,
   v_fs1_bytes,
   v_fs2_blocks,
   v_fs2_bytes,
   v_fs3_blocks,
   v_fs3_bytes,
   v_fs4_blocks,
   v_fs4_bytes,
   v_full_blocks,
   v_full_bytes
--'&PARTITIONNAME',
);
  dbms_output.put_line('Unformatted Blocks = '||v_unformatted_blocks);
  dbms_output.put_line('FS1 Blocks   = '||v_fs1_blocks);
  dbms_output.put_line('FS2 Blocks   = '||v_fs2_blocks);
  dbms_output.put_line('FS3 Blocks   = '||v_fs3_blocks);
  dbms_output.put_line('FS4 Blocks   = '||v_fs4_blocks);
  dbms_output.put_line('Full Blocks  = '||v_full_blocks);
 end;
/

Sample Output:

Unformatted Blocks = 16
FS1 Blocks   = 42  <--- 0-25% full
FS2 Blocks   = 31  <-- 25-50% full
FS3 Blocks   = 35  <-- 50-75% full
FS4 Blocks   = 4651 <- 75-99% full
Full Blocks  = 99448

 

Shrinking options:

-- Enable row movement.
ALTER TABLE scott.emp ENABLE ROW MOVEMENT;

-- Recover space and amend the high water mark (HWM).
ALTER TABLE scott.emp SHRINK SPACE;

-- Recover space, but don't amend the high water mark (HWM).
ALTER TABLE scott.emp SHRINK SPACE COMPACT;

-- Recover space for the object and all dependant objects.
ALTER TABLE scott.emp SHRINK SPACE CASCADE;

ASM Diskgroup Space Used / Free

SQL:
set linesize 140
col group_number heading 'Diskgroup|Number' format 999
col diskgroup heading 'Name' format a20
col total_mb heading 'Allocated (MB)' format 999,999,999
col free_mb heading 'Available (MB)' format 999,999,999
col tot_used heading 'Used (MB)' format 999,999,999
col pct_used heading '% Used' format 999
col pct_free heading '% Free' format 999
select group_number,
       name diskgroup,
       total_mb,
       free_mb,
       total_mb-free_mb tot_used,
       pct_used,
       pct_free
  from (select group_number,name,total_mb,free_mb,
             round(((total_mb-nvl(free_mb,0))/decode(total_mb,0,1,total_mb))*100) pct_used,
             round((free_mb/total_mb)*100) pct_free
      from v$asm_diskgroup
      where total_mb >0
      order by pct_free
     )
/

SAMPLE OUTPUT:
Diskgroup
   Number Name            Allocated (MB) Available (MB)   Used (MB) % Used % Free
--------- --------------- -------------- -------------- ----------- ------ ------
        2 DATA2                5,767,234      1,860,008   3,907,226     68     32
        1 DATA1                5,767,234      1,996,305   3,770,929     65     35