fragment

admin · 发表于 2023-12-1 10:25:32

-- 数据库总空间

set linesize 160 pagesize 999;
select sum(bytes)/(1024*1024*1024) from dba_data_files;
select sum(bytes)/(1024*1024*1024) from dba_segments;
select sum(bytes)/(1024*1024*1024) from dba_free_space;

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-- FSFI值

select a.tablespace_name,
sqrt(max(a.blocks) / sum(a.blocks)) * (100 / sqrt(sqrt(count(a.blocks)))) FSFI
from dba_free_space a, dba_tablespaces b
where a.tablespace_name = b.tablespace_name
and b.contents not in ('TEMPORARY','UNDO')
group by a.tablespace_name
order by FSFI;

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-- 按表空间显示连续的空闲空间

========
Script : tfstsfgm
========
SET ECHO off
REM NAME:TFSTSFRM.SQL
REM USAGE:"@path/tfstsfgm"
REM ------------------------------------------------------------------------
REM REQUIREMENTS:
REM SELECT ON DBA_FREE_SPACE
REM ------------------------------------------------------------------------
REM PURPOSE:
REM The following is a script that will determine how many extents
REM of contiguous free space you have in Oracle as well as the
REM total amount of free space you have in each tablespace. From
REM these results you can detect how fragmented your tablespace is.
REM
REM The ideal situation is to have one large free extent in your
REM tablespace. The more extents of free space there are in the
REM tablespace, the more likely you will run into fragmentation
REM problems. The size of the free extents is also very important.
REM If you have a lot of small extents (too small for any next
REM extent size) but the total bytes of free space is large, then
REM you may want to consider defragmentation options.
REM ------------------------------------------------------------------------
REM DISCLAIMER:
REM This script is provided for educational purposes only. It is NOT
REM supported by Oracle World Wide Technical Support.
REM The script has been tested and appears to work as intended.
REM You should always run new scripts on a test instance initially.
REM ------------------------------------------------------------------------
REM Main text of script follows:
create table SPACE_TEMP (
TABLESPACE_NAME CHAR(30),
CONTIGUOUS_BYTES NUMBER)
/
declare
cursor query is select *
from dba_free_space
order by tablespace_name, block_id;
this_row query%rowtype;
previous_row query%rowtype;
total number;
begin
open query;
fetch query into this_row;
previous_row := this_row;
total := previous_row.bytes;
loop
fetch query into this_row;
exit when query%notfound;
if this_row.block_id = previous_row.block_id + previous_row.blocks then
total := total + this_row.bytes;
insert into SPACE_TEMP (tablespace_name)
values (previous_row.tablespace_name);
else
insert into SPACE_TEMP values (previous_row.tablespace_name,
total);
total := this_row.bytes;
end if;
previous_row := this_row;
end loop;
insert into SPACE_TEMP values (previous_row.tablespace_name,
total);
end;
/
set pagesize 60
set newpage 0
set echo off
ttitle center 'Contiguous Extents Report' skip 3
break on "TABLESPACE NAME" skip page duplicate
spool contig_free_space.lis
rem
column "CONTIGUOUS BYTES" format 999,999,999,999
column "COUNT" format 999999
column "TOTAL BYTES" format 999,999,999,999
column "TODAY" noprint new_value new_today format a1
rem
select TABLESPACE_NAME "TABLESPACE NAME",
CONTIGUOUS_BYTES "CONTIGUOUS BYTES"
from SPACE_TEMP
where CONTIGUOUS_BYTES is not null
order by TABLESPACE_NAME, CONTIGUOUS_BYTES desc;
select tablespace_name, count(*) "# OF EXTENTS",
sum(contiguous_bytes) "TOTAL BYTES"
from space_temp
group by tablespace_name;
spool off
drop table SPACE_TEMP
/

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-- 普通表碎片评估方法

col frag format 99.99
col owner format a20;
col table_name format a30;
select * from (
select a.owner,
a.table_name,
a.num_rows,
a.avg_row_len * a.num_rows space,
b.bytes,
(a.avg_row_len * a.num_rows / b.bytes) frag,
to_char(a.last_analyzed,'YYYY-MM-DD')
from dba_tables a, dba_segments b
where a.table_name = b.segment_name
and a.owner= b.owner
and a.owner not in
('SYS', 'SYSTEM', 'OUTLN', 'DMSYS', 'TSMSYS', 'DBSNMP', 'WMSYS',
'EXFSYS', 'CTXSYS', 'XDB', 'OLAPSYS', 'ORDSYS', 'MDSYS', 'SYSMAN')
and (a.avg_row_len * a.num_rows / b.bytes) < 0.7
-- and PARTITIONED='NO'
order by b.bytes desc)
where rownum <= 50;

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-- 单表碎片情况

select a.owner,
a.table_name,
a.num_rows,
a.avg_row_len * a.num_rows space,
b.bytes,
(a.avg_row_len * a.num_rows / b.bytes) frag,
to_char(a.last_analyzed,'YYYY-MM-DD')
from dba_tables a, dba_segments b
where a.table_name = b.segment_name
and a.owner= b.owner
and a.owner not in
('SYS', 'SYSTEM', 'OUTLN', 'DMSYS', 'TSMSYS', 'DBSNMP', 'WMSYS',
'EXFSYS', 'CTXSYS', 'XDB', 'OLAPSYS', 'ORDSYS', 'MDSYS', 'SYSMAN')
and PARTITIONED='NO'
and a.table_name='TF_B_TRADE_BOOKING'
and a.owner='UCR_CRM1'
order by b.bytes desc
/

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-- 分区表碎片评估方法

col frag format 99.99
col table_owner format a20;
col table_name format a30;
col partition_name format a15;
select * from (
select a.table_owner,
a.table_name,
a.partition_name,
a.num_rows,
a.avg_row_len * a.num_rows space,
b.bytes,
(a.avg_row_len * a.num_rows / b.bytes) frag,
to_char(a.last_analyzed,'YYYY-MM-DD')
from dba_tab_partitions a, dba_segments b
where a.table_name = b.segment_name
and a.table_owner= b.owner
and a.partition_name = b.PARTITION_NAME
and a.table_owner not in
('SYS', 'SYSTEM', 'OUTLN', 'DMSYS', 'TSMSYS', 'DBSNMP', 'WMSYS',
'EXFSYS', 'CTXSYS', 'XDB', 'OLAPSYS', 'ORDSYS', 'MDSYS', 'SYSMAN','SH')
and (a.avg_row_len * a.num_rows / b.bytes) < 0.7
and b.segment_type='TABLE PARTITION'
order by b.bytes desc)
where rownum <= 50;

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-- 单个分区表碎片情况

select a.table_owner,
a.table_name,
a.partition_name,
a.num_rows,
a.avg_row_len * a.num_rows space,
b.bytes,
(a.avg_row_len * a.num_rows / b.bytes) frag,
to_char(a.last_analyzed,'YYYY-MM-DD')
from dba_tab_partitions a, dba_segments b
where a.table_name = b.segment_name
and a.table_owner= b.owner
and a.partition_name = b.PARTITION_NAME
and b.segment_type='TABLE PARTITION'
and a.table_name='SERV'
and a.table_owner='USER_PRODUCT'
order by 1,2,3;

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-- 索引碎片评估方法

col tablespace_name format a20;
col owner format a10;
col index_name format a30;
select *
from (select id.tablespace_name,
id.owner,
id.index_name,
id.blevel,
sum(sg.bytes) / 1024 / 1024 "size(M)",
sg.blocks,
sg.extents
from dba_indexes id, dba_segments sg
where id.owner = sg.owner
and id.index_name = sg.segment_name
and id.tablespace_name = sg.tablespace_name
and id.owner not in
('SYS', 'SYSTEM', 'USER', 'DBSNMP', 'ORDSYS', 'OUTLN')
and sg.extents > 100
and id.blevel >= 3
group by id.tablespace_name,
id.owner,
id.index_name,
id.blevel,
sg.blocks,
sg.extents
having sum(sg.bytes) / 1024 / 1024 > 100
order by sum(sg.bytes) / 1024 / 1024 desc )
where rownum <= 50;

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-- 单索引碎片情况

select id.tablespace_name,
id.owner,
id.index_name,
id.blevel,
sum(sg.bytes) / 1024 / 1024,
sg.blocks,
sg.extents
from dba_indexes id, dba_segments sg
where id.owner = sg.owner
and id.index_name = sg.segment_name
and id.tablespace_name = sg.tablespace_name
and id.owner ='UCR_CRM1'
and id.index_name = 'PK_TF_B_TRADE_4G_VAC_PRODUCT'
group by id.tablespace_name,
id.owner,
id.index_name,
id.blevel,
sg.blocks,
sg.extents;

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-- 索引大小>80%表大小的索引列表

select * from (
WITH Q AS (
SELECT
S.OWNER A_OWNER,
TABLE_NAME A_TABLE_NAME,
INDEX_NAME A_INDEX_NAME,
INDEX_TYPE A_INDEX_TYPE,
I.PARTITIONED A_PART,
SUM(S.bytes) / 1048576 A_MB
FROM DBA_SEGMENTS S,
DBA_INDEXES I
WHERE S.OWNER = I.owner
AND INDEX_NAME = SEGMENT_NAME
GROUP BY S.OWNER, TABLE_NAME, INDEX_NAME, INDEX_TYPE,PARTITIONED
HAVING SUM(S.BYTES) > 1048576 * 100
)
SELECT /*+ NO_QUERY_TRANSFORMATION(S) */
A_OWNER OWNER,
A_TABLE_NAME TABLE_NAME,
A_INDEX_NAME INDEX_NAME,
A_INDEX_TYPE INDEX_TYPE,
A_PART PARTITIONEND,
A_MB IND_MB,
sum(bytes)/1024/1024 tab_MB
FROM Q,
dba_segments d
WHERE
D.owner(+)= q.A_OWNER AND
D.segment_NAME = q.A_TABLE_NAME
GROUP BY
A_OWNER,
A_TABLE_NAME,
A_INDEX_NAME,
A_INDEX_TYPE,
A_PART,
A_MB HAVING A_MB>0.8*(SUM(bytes) / 1024/1024 )
ORDER BY
A_OWNER,
A_TABLE_NAME,
A_INDEX_NAME,
A_INDEX_TYPE,
A_MB DESC
) where rownum <=50;

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