Apress.Expert.Oracle.Database.Architecture.9i.and.10g.Programming.Techniques.and.Solutions.Sep.2005

■SETTING UP YOUR ENVIRONMENT
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where a.statistic# = b.statistic#
and lower(a.name) like '%' || lower('&S')||'%'
/
set echo on
For example, to see how much redo is generated by some UPDATE, we can do the following:
big_table@ORA10G> @mystat "redo size"
big_table@ORA10G> set echo off
NAME
VALUE
------------------------------ ----------
redo size 496
big_table@ORA10G> update big_table set owner = lower(owner)
2 where rownum @mystat2
big_table@ORA10G> set echo off
NAME
V DIFF
------------------------------ ---------- ----------------
redo size 89592 89,096
That shows our UPDATE of 1,000 rows generated 89,096 bytes of redo.
SHOW_SPACE
The SHOW_SPACE routine prints detailed space utilization information for database segments.
Here is the interface to it:
ops$tkyte@ORA10G> desc show_space
PROCEDURE show_space
Argument Name Type In/Out Default?
------------------------------ ----------------------- ------ --------
P_SEGNAME VARCHAR2 IN
P_OWNER VARCHAR2 IN DEFAULT
P_TYPE VARCHAR2 IN DEFAULT
P_PARTITION VARCHAR2 IN DEFAULT
The arguments are as follows:
• P_SEGNAME: Name of the segment (e.g., the table or index name).
• P_OWNER: Defaults to the current user, but you can use this routine to look at some other
schema.