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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