Oracle表變化趨勢追蹤記錄

#dba_hist_seg_stat可以看出物件的使用趨勢，構造如下sql查詢出每個時間段內資料庫物件的增長量，其中db_block_changes_delta為塊個數 

select
c.snap_id,
to_char(c.end_interval_time, 
'yyyy-mm-dd
') snap_time,
a.owner,
a.object_name
, a.object_type,
b.db_block_changes_delta
from
dba_objects a,
(select
snap_id, obj#, db_block_changes_delta
from
dba_hist_seg_stat
where db_block_changes_delta >
20000
order
by snap_id desc, db_block_changes_delta desc
) b,
dba_hist_snapshot c
where a.object_id
=b.obj#
and object_type =
'table
'and b.snap_id =
c.snap_id
order
bydb_block_changes_delta 
#下面的sql查詢出某個時間段內，資料庫物件的變化大小，單位以換算成gb
select a.object_name
, to_char(c.end_interval_time, 
'yyyy-mm-dd
') snap_time,
sum(b.db_block_changes_delta) /
1024
/1024
gb 
from
dba_objects a,
(select
snap_id, obj#, db_block_changes_delta
from
dba_hist_seg_stat
where db_block_changes_delta >
20000
order
by snap_id desc, db_block_changes_delta desc
) b,
dba_hist_snapshot c
where a.object_id
=b.obj#
and object_type =
'table
'and b.snap_id =
c.snap_id
group
by a.object_name
, c.end_interval_time
order
bygb

簡單介紹下dba_hist_seg_stat 。dba_hist_seg_stat檢視內記錄了資料庫例項啟動以來段的變化資訊，該檢視的資料來自於v$segstat 

column datatype null description 
snap_id number unique snapshot id 
dbid number database id for the snapshot 
instance_number number instance number for the snapshot 
ts# number tablespace number 
obj# number dictionary object number 
dataobj# number data object number 
logical_reads_total number cumulative value for logical reads 
logical_reads_delta number delta value for logical reads 
buffer_busy_waits_total number cumulative value for buffer busy waits 
buffer_busy_waits_delta number delta value for buffer busy waits 
db_block_changes_total number cumulative value for db block changes 
db_block_changes_delta number delta value for db block changes 
physical_reads_total number cumulative value for physical reads 
physical_reads_delta number delta value for physical reads 
physical_writes_total number cumulative value for physical writes 
physical_writes_delta number delta value for physical writes 
physical_reads_direct_total number cumulative value for physical reads direct 
physical_reads_direct_delta number delta value for physical reads direct 
physical_writes_direct_total number cumulative value for physical writes direct 
physical_writes_direct_delta number delta value for physical writes direct 
itl_waits_total number cumulative value for itl waits 
itl_waits_delta number delta value for itl waits 
row_lock_waits_total number cumulative value for row lock waits 
row_lock_waits_delta number delta value for row lock waits 
gc_cr_blocks_served_total number cumulative value for global cache cr blocks served 
gc_cr_blocks_served_delta number delta value for global cache cr blocks served 
gc_cu_blocks_served_total number cumulative value for global cache current blocks served 
gc_cu_blocks_served_delta number delta value for global cache current blocks served 
gc_buffer_busy_total number cumulative value for global cache buffer busy 
gc_buffer_busy_delta number delta value for global cache buffer busy 
gc_cr_blocks_received_total number cumulative value for global cache cr blocks received 
gc_cr_blocks_received_delta number delta value for global cache cr blocks received 
gc_cu_blocks_received_total number cumulative value for global cache current blocks received 
gc_cu_blocks_received_delta number delta value for global cache current blocks received 
space_used_total number cumulative value for space used 
space_used_delta number delta value for space used 
space_allocated_total number cumulative value for space allocated 
space_allocated_delta number delta value for space allocated 
table_scans_total number cumulative value for table scans 
table_scans_delta number delta value for table scans

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