show_space_assm

转载于 yrg5101  的  http://blog.youkuaiyun.com/yrg5101/article/details/7868159 

 

create or replace procedure show_space_assm(
p_segname in varchar2,
p_owner in varchar2 default user,
p_type in varchar2 default 'TABLE' )
as
l_fs1_bytes number;
l_fs2_bytes number;
l_fs3_bytes number;
l_fs4_bytes number;
l_fs1_blocks number;
l_fs2_blocks number;
l_fs3_blocks number;
l_fs4_blocks number;
l_full_bytes number;
l_full_blocks number;
l_unformatted_bytes number;
l_unformatted_blocks number;
procedure p( p_label in varchar2, p_num in number )
is
begin
dbms_output.put_line( rpad(p_label,40,'.') ||p_num );
end;
begin
dbms_space.space_usage(
segment_owner => p_owner,
segment_name => p_segname,
segment_type => p_type,
fs1_bytes => l_fs1_bytes,
fs1_blocks => l_fs1_blocks,
fs2_bytes => l_fs2_bytes,
fs2_blocks => l_fs2_blocks,
fs3_bytes => l_fs3_bytes,
fs3_blocks => l_fs3_blocks,
fs4_bytes => l_fs4_bytes,
fs4_blocks => l_fs4_blocks,
full_bytes => l_full_bytes,
full_blocks => l_full_blocks,
unformatted_blocks => l_unformatted_blocks,
unformatted_bytes => l_unformatted_bytes);
p('free space 0-25% Blocks:',l_fs1_blocks);
p('free space 25-50% Blocks:',l_fs2_blocks);
p('free space 50-75% Blocks:',l_fs3_blocks);
p('free space 75-100% Blocks:',l_fs4_blocks);
p('Full Blocks:',l_full_blocks);
p('Unformatted blocks:',l_unformatted_blocks);
end;

/

在ASSM 下，block 的空间使用分为free space：0-25%、25-50%、50-75%、70-100%和Full
这5 种情况，show_space_assm 会对需要统计的table 汇总这5 种类型的block 数量。
来看table HWM1 的空间使用情况：

 

set serveroutput on

SQL> exec show_space_assm( 'HWM1','DLINGER');
free space 0-25% Blocks:.................0
free space 25-50% Blocks:...............1
free space 50-75% Blocks:...............0
free space 75-100% Blocks:..............8
Full Blocks:.....................................417
Unformatted blocks:.........................0
这个结果显示，对于table HWM1，full 的block 有417 个，free space 为75-100% block 有8
个，free space 25-50% block 有1 个。当table HWM 下的blocks 的状态大多为free space 较高值
时，可以考虑合并HWM 下的blocks，将空闲的block 释放，降低table 的HWM。