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Monitoring STATSPACK table extents

Oracle Tips by Burleson Consulting

Here is a handy script for monitoring the number of extents for all STATSPACK tables.  The script is called sp_extents.sql and you can use this script to see the space used by all STATSPACK tables.

This script has many lines that are commented out of the output so that you can choose which columns from Remote DBA_tables and Remote DBA_segments that you wish to see. In most cases, this report will show you which tables are extending rapidly and consuming an inordinate amount of room in your perfstat tablespace.

sp_extents.sql

-- sp_extents.sql - Lists all STATSPACK  tables & size data
-- Written 7/16/01 by Donald Burleson

set pause off;
set echo off;
set linesize 150;
set pages 999;

column c1  heading "Tablespace";
column c2  heading "Owner";
column c3  heading "Table"          format a30;
column c4  heading "Size (KB)"      format 999,999;
column c5  heading "Alloc. Ext"     format 999;
column c6  heading "Max Ext";
column c7  heading "Init Ext (KB)";
column c8  heading "Next Ext (KB)";
column c9  heading "% Inc";
column c10 heading "% Free";
column c11 heading "% Used";
column c12 heading "Num_rows"       format 999,999,999;
column c13 heading "avg_row_len"       format 999,999,999;
column c14 heading "Chains"       format 999,999,999;
break on c1 skip 2 on c2 skip 2

ttitle "Fragmented Tables";

select 
--        substr(seg.tablespace_name,1,10)  c1,
--        substr(tab.owner,1,10)            c2,
          substr(tab.table_name,1,30)       c3,
          seg.bytes/1024                    c4,
          seg.extents                       c5,
--        tab.max_extents                   c6,

--        tab.initial_extent/1024           c7,
--        tab.next_extent/1024              c8
--        tab.pct_increase                  c9,
--        tab.pct_free                     c10,
--        tab.pct_used                     c11
          tab.num_rows                     c12,
          tab.avg_row_len                  c13
--        tab.chain_cnt                    c14
from    sys.Remote DBA_segments seg,
        sys.Remote DBA_tables   tab
where   seg.tablespace_name = tab.tablespace_name
  and   seg.owner = tab.owner
  and   seg.segment_name = tab.table_name
and tab.table_name like 'STATS%'
order by 4 desc
;

Here is a sample listing from this script.

Table                          Size (KB) Alloc. Ext     Num_rows  row_len
------------------------------ --------- ---------- ------------ --------
STATS$SQL_SUMMARY                941,040         89    1,373,381      274
STATS$PARAMETER                   54,080         52      971,514       54
STATS$SYSSTAT                     23,920         23      451,774       50
STATS$LATCH                       20,800         20      301,849       67
STATS$SYSTEM_EVENT                 5,200          5       84,961       47
STATS$SGASTAT_SUMMARY              3,120          3       77,769       37
STATS$ENQUEUESTAT                  2,080          2       46,759       26
STATS$ROWCACHE_SUMMARY             3,120          3       45,977       63
STATS$FILESTATXS                   4,160          4       37,981       84
STATS$BG_EVENT_SUMMARY             2,080          2       37,969       47
STATS$LATCH_MISSES_SUMMARY         2,080          2       29,367       55
STATS$WAITSTAT                     1,040          1       27,986       35
STATS$VMSTAT                      10,240          1       27,964       42
STATS$LIBRARYCACHE                 1,040          1       15,992       55
STATS$ROLLSTAT                     1,040          1        7,996       67
STATS$SNAPSHOT                     1,040          1        1,999       53
STATS$BUFFER_POOL_STATISTICS       1,040          1        1,999       87
STATS$IDX_STATS                    1,040          1        1,144       84
STATS$TAB_STATS                    1,040          1        1,028       78
STATS$BUFFER_POOL                  1,040          1           32       30
STATS$SGAXS                        1,040          1           32       57
STATS$IDLE_EVENT                      80          1           14       22
STATS$LEVEL_DESCRIPTION               80          1            3      145
STATS$DATABASE_INSTANCE               80          1            1       38
STATS$STATSPACK_PARAMETER             80          1            1       46
STATS$LATCH_CHILDREN               1,040          1            0        0
STATS$SESSION_EVENT                1,040          1            0        0
STATS$SESSTAT                      1,040          1            0        0


This is an excerpt from "Oracle9i High Performance tuning with STATSPACK" by Oracle Press.


If you like Oracle tuning, you may enjoy the new book "Oracle Tuning: The Definitive Reference", over 900 pages of BC's favorite tuning tips & scripts. 

You can buy it direct from the publisher for 30%-off and get instant access to the code depot of Oracle tuning scripts.


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