1.get_alert_log

获取alert文件的路径和名称

set serveroutput on        --设置输出，让sqlplus在屏幕上可以输出。（要加入到login.sql中！）

create or replace procedure get_alert_log
is
  alert_name varchar2(513);
begin
select a.value||‘/alert_‘||b.value||‘.log‘ into alert_name from
(select value from v$parameter where name=‘background_dump_dest‘) a,
(select value from v$parameter where name=‘instance_name‘) b;
dbms_output.put_line(chr(10)||alert_name);
end get_alert_log;
/

create public synonym get_alert_log for sys.get_alert_log;     --设置一个公共同义词，让其他用户可以访问
grant execute on get_alert_log to public;                -- 授权
exec get_alert_log    --执行过程得到路径

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2.get_trace_file

定位跟踪文件
create or replace procedure get_trace_file (v_sid number default userenv(‘sid‘))
is
  trace_file_name varchar2(513);
begin
select  d.value||‘/‘||lower(rtrim(i.instance, chr(0)))||‘_ora_‘||p.spid||‘.trc‘
into trace_file_name
from  ( select p.spid   from v$mystat m,v$session s,v$process p
where m.statistic# = 1 and s.sid = v_sid and p.addr = s.paddr) p,
( select t.instance from v$thread  t,v$parameter  v
  where v.name = ‘thread‘
  and (v.value = http://www.mamicode.com/0 or t.thread# = to_number(v.value))) i,
  ( select value from v$parameter where name = ‘user_dump_dest‘) d;
  dbms_output.put_line(chr(10)||trace_file_name);
end get_trace_file;
/

grant select on v_$mystat to public;
grant select on v_$session to public;
grant select on v_$process to public;
grant select on v_$thread to public;
grant select on v_$parameter to public;
create public synonym get_trace_file for sys.get_trace_name;
grant execute on get_trace_file to public;

exec get_trace_file; --当前会话
exec get_trace_file(59);  --指定会话

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3.show_space

create or replace procedure show_space
( p_segname in varchar2,
p_owner in varchar2 default user,
p_type in varchar2 default ‘TABLE‘,
p_partition in varchar2 default NULL )
-- this procedure uses authid current user so it can query DBA_*
-- views using privileges from a ROLE, and so it can be installed
-- once per database, instead of once per user who wanted to use it
authid current_user
as
l_free_blks number;
l_total_blocks number;
l_total_bytes number;
l_unused_blocks number;
l_unused_bytes number;
l_LastUsedExtFileId number;
l_LastUsedExtBlockId number;
l_LAST_USED_BLOCK number;
l_segment_space_mgmt varchar2(255);
l_unformatted_blocks number;
l_unformatted_bytes number;
l_fs1_blocks number; l_fs1_bytes number;
l_fs2_blocks number; l_fs2_bytes number;
l_fs3_blocks number; l_fs3_bytes number;
l_fs4_blocks number; l_fs4_bytes number;
l_full_blocks number; l_full_bytes number;
-- inline procedure to print out numbers nicely formatted
-- with a simple label
procedure p( p_label in varchar2, p_num in number )
is
begin
dbms_output.put_line( rpad(p_label,40,‘.‘) ||
to_char(p_num,‘999,999,999,999‘) );
end;
begin
-- this query is executed dynamically in order to allow this procedure
-- to be created by a user who has access to DBA_SEGMENTS/TABLESPACES
-- via a role as is customary.
-- NOTE: at runtime, the invoker MUST have access to these two
-- views!
-- this query determines if the object is an ASSM object or not
begin
execute immediate
‘select ts.segment_space_management
from dba_segments seg, dba_tablespaces ts
where seg.segment_name = :p_segname
and (:p_partition is null or
seg.partition_name = :p_partition)
and seg.owner = :p_owner
and seg.tablespace_name = ts.tablespace_name‘
into l_segment_space_mgmt
using p_segname, p_partition, p_partition, p_owner;
exception
when too_many_rows then
dbms_output.put_line
( ‘This must be a partitioned table, use p_partition => ‘);
return;
end;
-- if the object is in an ASSM tablespace, we must use this API
-- call to get space information, otherwise we use the FREE_BLOCKS
-- API for the user-managed segments
if l_segment_space_mgmt = ‘AUTO‘
then
dbms_space.space_usage
( p_owner, p_segname, p_type, l_unformatted_blocks,
l_unformatted_bytes, l_fs1_blocks, l_fs1_bytes,
l_fs2_blocks, l_fs2_bytes, l_fs3_blocks, l_fs3_bytes,
l_fs4_blocks, l_fs4_bytes, l_full_blocks, l_full_bytes, p_partition);
p( ‘Unformatted Blocks ‘, l_unformatted_blocks );
p( ‘FS1 Blocks (0-25) ‘, l_fs1_blocks );
p( ‘FS2 Blocks (25-50) ‘, l_fs2_blocks );
p( ‘FS3 Blocks (50-75) ‘, l_fs3_blocks );
p( ‘FS4 Blocks (75-100)‘, l_fs4_blocks );
p( ‘Full Blocks ‘, l_full_blocks );
else
dbms_space.free_blocks(
segment_owner => p_owner,
segment_name => p_segname,
segment_type => p_type,
freelist_group_id => 0,
free_blks => l_free_blks);
p( ‘Free Blocks‘, l_free_blks );
end if;
-- and then the unused space API call to get the rest of the
-- information
dbms_space.unused_space
( segment_owner => p_owner,
segment_name => p_segname,
segment_type => p_type,
partition_name => p_partition,
total_blocks => l_total_blocks,
total_bytes => l_total_bytes,
unused_blocks => l_unused_blocks,
unused_bytes => l_unused_bytes,
LAST_USED_EXTENT_FILE_ID => l_LastUsedExtFileId,
LAST_USED_EXTENT_BLOCK_ID => l_LastUsedExtBlockId,
LAST_USED_BLOCK => l_LAST_USED_BLOCK );
p( ‘Total Blocks‘, l_total_blocks );
p( ‘Total Bytes‘, l_total_bytes );
p( ‘Total MBytes‘, trunc(l_total_bytes/1024/1024) );
p( ‘Unused Blocks‘, l_unused_blocks );
p( ‘Unused Bytes‘, l_unused_bytes );
p( ‘Last Used Ext FileId‘, l_LastUsedExtFileId );
p( ‘Last Used Ext BlockId‘, l_LastUsedExtBlockId );
p( ‘Last Used Block‘, l_LAST_USED_BLOCK );
end;
/

SCOTT@test>exec show_space(‘BIG‘);
Unformatted Blocks .....................           7,144
FS1 Blocks (0-25) ......................               1
FS2 Blocks (25-50) .....................               0
FS3 Blocks (50-75) .....................               0
FS4 Blocks (75-100).....................           6,122
Full Blocks ............................         338,793
Total Blocks............................         352,896
Total Bytes.............................   2,890,924,032
Total MBytes............................           2,757
Unused Blocks...........................               0
Unused Bytes............................               0
Last Used Ext FileId....................               4
Last Used Ext BlockId...................         344,841
Last Used Block.........................           8,192

Unformatted Blocks：为表分配的位于高水位线（high-water mark, HWM）之下但未用的块数。把未格式化和未用的块加在一起，就是已为表分配但从未用于保存ASSM对象数据的总块数。

? FS1 Blocks-FS4 Blocks：包含数据的格式化块。项名后的数字区间表示各块的“空闲度”。例如，（0-25）是指空闲度为0~25%的块数。
? Full Blocks：已满的块数，不能再对这些执行插入。

? Total Blocks、Total bytes、Total Mbytes：为所查看的段分配的总空间量，单位分别是数据库块、字节和兆字节。
? Unused Blocks、Unused Bytes：表示未用空间所占的比例（未用空间量）。这些块已经分配给所查看的段，但目前在段的HWM之上。
? Last Used Ext FileId：最后使用的文件的文件ID，该文件包含最后一个含数据的区段（extent）。
? Last Used Ext BlockId：最后一个区段开始处的块ID；这是最后使用的文件中的块ID。
? Last Used Block：最后一个区段中最后一个块的偏移量

show_space/get_alert_log/get_trace_file