################################################V$active_session_history################################################
set line 1000
col session_id for 99999999
col session_serial# for 9999999
col program for a30
col sql_id for a30
col event for a30
col seq# for 999999
col count(*) for 99999
select session_id,session_serial#,program,sql_id,event,seq#,count(*)
from v$active_session_history
where sample_time between to_date('2018-12-27 08:00:00','yyyy-mm-dd hh34:mi:ss')
and to_date('2018-12-28 09:00:00','yyyy-mm-dd hh34:mi:ss')
and sql_id is not null
group by session_id,session_serial#,program,sql_id,event,seq#
having count(*) >1;
set line 100
col sample_time for a30
col sample_id for 9999999
col event for a30
col seq# for 9999999999
col sql_id for a30
select sample_time,sample_id,event,seq#,sql_id
from v$active_session_history
where session_id=&session_id
and session_serial#=&session_serial#
and event='&event'
and seq#=&seq#;
set line 200
col session_id for 999999999999
col session_serial for 9999999999
col xid for 9999999999
col program for a30
col event for a30
col blocking_session for 99999999
select session_id,session_serial,xid,program,event,blocking_session
from v$active_session_history
where between to_date('2018-12-27 08:00:00','yyyy-mm-dd hh34:mi:ss')
and to_date('2018-12-28 09:00:00','yyyy-mm-dd hh34:mi:ss')
and sql_id is not null
and xid is not null
set line 200
col session_id for 999999
col session_serial# for 9999999
col seq# for 99999999
col event for a30
col count(*) for 999999
select inst_num, session_id,session_serial#,seq#,event,
count(*)
from dba_hist_active_sess_history
where sample_time between to_date('2018-12-28 00:00:00','yyyy-mm-dd hh34:mi:ss')
and to_date('2018-12-29 00:00:00','yyyy-mm-dd hh34:mi:ss')
group by inst_num, session_id,session_serial#,seq#,event
order by count(*);
set line 100
col sample_id for 999999
col inst_num for 99
col blocking_session for 999999
select sample_id,inst_num,blocking_session
from dba_hist_active_sess_history
where sample_time between to_date('2018-12-28 00:00:00','yyyy-mm-dd hh34:mi:ss')
and to_date('2018-12-29 00:00:00','yyyy-mm-dd hh34:mi:ss')
and event='&event'
and inst_num=&inst_num
and session_id=&session_id
and session_serial=&session_serial
and seq#=&seq#
set line 100
col program for a30
col inst_num for 99
col sql_id for a30
select program,inst_num,event,sql_id
from dba_hist_active_sess_history
where sample_id=&sample_id
and inst_num=&inst_num
and session_id=&session_id
and session_serial#=&session_serial#
-- in_connection_mgmt
-- in_parse
-- in_hard_parse
-- in_sql_execution
-- in_plsql_execution
-- in_plsql_rpc
-- in_plsql_compliation
-- in_java_execution
-- in_bind
-- in_cursor_close
-- in_sequence_load
select
in_connection_mgmt,
in_parse,
in_hard_parse,
in_sql_execution,
in_plsql_execution,
in_plsql_rpc,
in_plsql_compliation,
in_java_execution,
in_bind,
in_cursor_close,
in_sequence_load
from dba_hist_active_sess_history
where inst_num=&inst_num
and SESSION_ID=&session_id
and session_serial#=&session_serial#
set line 100
col session_id for 99999999
col session_serial# for 9999999
col sql_id for a30
col sql_exec_id for 9999999
col count(*) for 99999999
select session_id,session_serial#,sql_id,sql_exec_id,count(*)
from dba_hist_active_sess_history
group by session_id,session_serial#,sql_id,sql_exec_id
order by count(*);
set line 100
col opname for a30
col plsql_entry_id for 999999
col p1 for a30
col p2 for a30
col p3 for a30
select opname,plsql_entry_id,p1,p2,p3
from dba_hist_active_sess_history
where instance_number=&instance_number
and session_id=&session_id
and session_serial#=&session_serial
set line 100
col program for a30
col inst_num for 99
col blocking_session for 99999999
col blocking_session_serial# for 99999999999
col blocking_inst_id for 9999
select program,inst_num,event,blocking_session,blocking_session_serial#,blocking_inst_id,sql_id
from dba_hist_active_sess_history
where inst_num=&inst_num
and session_id=&session_id
and session_serial#=&session_serial#
select type,parameter from v$rowcache where cache#=10
###############################V$session_longops,v$session#####查看進程剩余耗時#####################################
set line 200
col sid for 999999999999
col SERIAL# for 99999999999
col PROGRAM for a30
col opname for a30
col time_remaining for 99999999999999
SELECT a.SID,a.SERIAL#,a.PROGRAM "程序進程",b.OPNAME "操作名稱",b.TIME_REMAINING "剩余時間(秒)"
FROM v$session a,v$session_longops b
WHERE a.SID = b.SID
AND a.SERIAL# = b.SERIAL#
AND a.PROGRAM LIKE '%rman%'
AND time_remaining >0;
#############################oradebug#########################################################################################
1.session Tracing
alter session set tracefile_identifier='10046';
alter session set timed_statistics = true;
alter session set statistics_level=all;
alter session set max_dump_file_size = unlimited;
alter session set events '10046 trace name context forever,level 12';
2.tracing process
select p.PID,p.SPID,s.SID
from v$process p,v$session s
where s.paddr = p.addr
and s.sid = &SESSION_ID
/
select 'ospid: ' || p.spid || ' # ''' ||s.sid||','||s.serial#||''' '||
s.osuser || ' ' ||s.machine ||' '||s.username ||' '||s.program line
from v$session s , v$process p
where p.addr = s.paddr
and s.username <> ' ';
connect / as sysdba
oradebug setospid 9834
oradebug unlimit
oradebug event 10046 trace name context forever,level 12
oradebug tracefile_name
oradebug event 10046 trace name context off
connect / as sysdba
oradebug setorapid 9834
oradebug unlimit
oradebug event 10046 trace name context forever,level 12
oradebug tracefile_name
oradebug event 10046 trace name context off
-- 10053 trace
####################################################v$SQLAREA####################################################################
yyyy-mm-dd hh34:mi:ss
set line 200
col sql_id for a30
col last_active_time for a30
col first_load_time
col last_load_time
col executions
col buffer_gets
col user_io_wait_time
col cpu_time
col elapsed_time
col physical_read_requests
col physical_read_bytes
select
sql_id,
last_active_time,
first_load_time,
last_load_time,
executions,
buffer_gets,
user_io_wait_time,
cpu_time,
elapsed_time,
physical_read_requests,
physical_read_bytes
from v$SQLAREA
order by physical_read_bytes desc;
##############################################實驗:檢查兩個表中的數(shù)據(jù)及對應(yīng)的數(shù)據(jù)的條數(shù)是否相同########################################
1.建立視圖
create or replace view v as
select * from emp where deptno!=10
union all
select * from emp where ename='SCOTT'
2.要求查找視圖V和表emp中不同的數(shù)據(jù)
SELECT rownum,empno,ename
FROM v
WHERE ename='SCOTT';
SELECT rownum,empno,ename
FROM emp
WHERE ename='SCOTT';
3.比較數(shù)據(jù)集不同
select v.empno,v.ename ,b.empno,b.ename
from v
full join
emp b on(v.empno=b.empno)
where (v.empno is null or b.empno is null);
####################################################統(tǒng)計信息######################################
dba_tab_statistics
dba_tab_col_statistics
set line 100
-- var low_value number;
-- var high_value varchar2(100);
-- select DBMS_STATS.CONVERT_RAW_VALUE('yuiovbssas',:high_value) from dual;
col owner for a10
col table_name for a20
col column_name for a30
col high_value for a30
col low_value for a30
col num_nulls for 9999
col histogram for a30
select owner,table_name,column_name,high_value,low_value,num_nulls,histogram
from dba_tab_col_statistics
where table_name=''
and column_name=''
and owner='';
set line 200
col owner for a20
col table_name for a20
col num_rows for 99999
col partition_name for a20
col LAST_ANALYZED for a30
col blocks for 99999
col empty_blocks for 99999
select owner,table_name,num_rows,partition_name,LAST_ANALYZED,blocks,empty_blocks
from dba_tab_statistics
where owner=''
and table_name='';
-- -- -- -- -- -- -- -- -- -- 索引統(tǒng)計系信息-- -- -- -- -- -- -- --
查看索引的聚簇因子,
-- 聚簇因子應(yīng)該與表的塊數(shù)近似
set line 100
col ower for a10
col table_name for a20
col index_name for a20
col clustering_factor for 999999999
col NUM_ROWS for 99999
select owner,table_name,index_name,clustering_factor,NUM_ROWS
from dba_indexes
where index_name='&index_name'
and owner='&owner'
and table_name='&table_name';
查看數(shù)據(jù)表當(dāng)前占用block數(shù)目
select count(dbms_rowid.rowid_block_number(rowid)) from &table_name;
-- -- -- -- -- -- -- -- -- -- -- --列統(tǒng)計信息 -- -- -- -- -- -- -- -- -- -- -- --
set line 100 verify off
col low_value for a30
col high_value for a30
col num_distinct for 99999
col num_nulls for 9999999
select low_value,high_value,num_distinct,num_nulls
from dba_tab_col_statistics
where table_name='&table_name'
and owner='&owner'
and column_name='&column_name';
-- 1 41,43,43,45,53,53,24 5F75746C245F6C6E635F696E645F7061727473 10807 0
var l varchar2(100);
exec dbms_stats.convert_row_value('5F75746C245F6C6E635F696E645F7061727473',:l);
print l;
#######################V$sqlarea########################################
set line 200
col sql_id for a30
col plan_hash_value for 30
col executions for 99999
col first_load_time for a30
col disk_reads for 99999
col buffer_gets for 9999999
col cpu_time for 9999999999
col last_load_time for 999999999
col last_active_time for 99999999
col loads for 999999
select sql_id,plan_hash_value,executions,first_load_time,disk_reads,buffer_gets,cpu_time,last_load_time,last_active_time,loads
from v$sqlarea
where sql_id='<>';
###################################################################查詢隱含參數(shù)
SELECT KSPPINM, KSPPSTVL, KSPPDESC
FROM X$KSPPI X, X$KSPPCV Y
WHERE X.INDX = Y.INDX AND KSPPINM = '_db_file_optimizer_read_count';
#################通過創(chuàng)建索引來避免全表掃描,不必要的排序,函數(shù)索引,重建索引避免全表掃描#################
1.創(chuàng)建復(fù)合索引
create index on (column_name,0) tablespace ;
原理:雖然對于單鍵值B樹索引而言NULL值不入索引,但對于復(fù)合索引B樹索引來說,NULL值是入索引的。
2.對于需要排序的列創(chuàng)建索引
create index table_name(column_name) tablespace ;
3.
百分號在最前面的like條件確實是沒法走索引的,-----'%....'
但同時我們也知道對于有百分號的like條件,
如果百分號的like條件的最后面,則這種情況下是可以走索引的。-----'...%'
在不改變SQL的情形下把百分號從like條件的最前面移到最后面
create index on (reverse(column_name)) ;
4.創(chuàng)建全局索引
create index on () online tablespace
###################對癥下藥
1.如果是統(tǒng)計信息不準(zhǔn)或是因為CBO計算某些SQL的成本所用的公式先天不足而導(dǎo)致的SQL性能問題,
我們可以通過重新收集統(tǒng)計信息,或者手動修改統(tǒng)計信息,或者使用Hint來加以解決。
2.如果是SQL語句的寫法問題,我們可以通過在不更改業(yè)務(wù)邏輯的情況下改寫SQL來加以解決。
3.如果是不必要的全表掃描/排序而導(dǎo)致的目標(biāo)SQL的性能問題,我們可以通過建立合適的索引(包括函數(shù)索引、位圖索引)來解決。
4.如果是因為各種原因?qū)е碌哪繕?biāo)SQL的執(zhí)行計劃不穩(wěn)定,可以通過使用hint、sql profile或者spm來加以解決。
5.如果是表或者索引的不良設(shè)計導(dǎo)致的目標(biāo)SQL的性能問題,我們可以通過重新設(shè)計表/索引,重新組織表的里的數(shù)據(jù)來加以解決。
6.如果上述調(diào)整措施都失效,可以考慮用并行來縮短目標(biāo)SQL的執(zhí)行時間。
7.如果上述調(diào)整措施都失效,調(diào)整SQL。
#################創(chuàng)建索引##############################
create index table_name(column_name) tablespace online nologging parallel 2;
alter index noparallel;
##################分區(qū)表信息確認##################
1.
set line 100
col table_name for a30
col num_rows for 999999
col blocks for 9999999
col avg_row_len for 99999999
col partitioned for a10
col ext_M for 9999999
select table_name,
num_rows ,--記錄數(shù)
blocks,
avg_row_len,
partitioned, --是否分區(qū)
num_rows * avg_row_len /1024/1024/1024/0.9 est_M -- "數(shù)據(jù)量大小"
from dba_tables
where table_name='&table_name';
set line 100
col partitioning_type for a10
col subpartitioning_type for a10
select partitioning_type, --分區(qū)類型
subpartitioning_type
from dba_part_tables
where table_name='&table_name'
set line 100
col owner for a10
col name for a20
col object_type for a30
col column_name for a30 --分區(qū)列
col column_position for a30
select *
from dba_part_key_columns
where name ='&table_name';
#############SPM########################
在當(dāng)前session中禁掉spm并同時開啟自動捕獲sql plan baseline
alter session set optimizer_use_sql_plan_baseline=false;
alter session set optimizer_capture_sql_plan_baseline=true;
select sql_handle,plan_name,origin,enabled,accepted,sql_text from dba_sql_plan_baseline where sql_text like '';
############################執(zhí)行計劃######################
alter session set statistics_level='ALL' ;
set line 200 pages 100
select * from table(dbms_xplan.display_cursor(null,null,'allstats last'));
-------------------------------------------------------------------------------------
| Id | Operation | Name | Starts | E-Rows | A-Rows | A-Time | Buffers |
-------------------------------------------------------------------------------------
| 0 | SELECT STATEMENT | | 1 | | 9 |00:00:00.01 | 4 |
|* 1 | COUNT STOPKEY | | 1 | | 9 |00:00:00.01 | 4 |
| 2 | TABLE ACCESS FULL| T1 | 1 | 9 | 9 |00:00:00.01 | 4 |
-------------------------------------------------------------------------------------
Starts:表示每個具體執(zhí)行計劃步驟被重復(fù)執(zhí)行的次數(shù)
E-Rows:表示執(zhí)行計劃中cbo對每一個具體執(zhí)行計劃步驟返回結(jié)果集cardinality的預(yù)估值
A-Rows:表示執(zhí)行計劃中每個具體步驟的返回結(jié)果集的cardinality的實際值
A-Time:表示執(zhí)行計劃中每一個具體執(zhí)行計劃中實際執(zhí)行時間
Buffers:表示執(zhí)行計劃中每一個具體執(zhí)行計劃步驟實際消耗的邏輯讀
###########################選擇率################################3
對于like '%...%'這樣的模糊查詢條件,cbo默認的可選擇率5%來評估其返回結(jié)果集的cardinality的值
###################查詢表空間使用率
COLUMN ts_name format a35 heading "Tablespace"
COLUMN unalloc_size format 999,999 heading "Unalloc(MB)"
COLUMN used_size format 999,999,999 heading "Used(MB)"
COLUMN free_size format 999,999 heading "Free(MB)"
COLUMN capacity format 99,99 heading "Used_pct(%)"
SELECT a.tablespace_name ts_name
,a.unalloc_size
,nvl(f.free_size, 0) free_size
,a.used_size - nvl(f.free_size, 0) used_size
,round((a.used_size - nvl(f.free_size, 0)) /
(a.unalloc_size + a.used_size)
,2)*100 capacity
FROM (SELECT tablespace_name
,round(SUM(bytes) / 1024 / 1024) free_size
,round(AVG(bytes)/1024/1024) avg_size
FROM dba_free_space
GROUP BY tablespace_name) f
,(SELECT tablespace_name
,round(SUM(user_bytes) / 1024 / 1024) used_size
,round(SUM(decode(autoextensible
,'YES'
,decode(sign(maxbytes - user_bytes)
,-1
,0
,maxbytes - user_bytes)
,0)) / 1024 / 1024) unalloc_size
FROM dba_data_files
WHERE status='AVAILABLE'
GROUP BY tablespace_name) a
WHERE 1 = 1
AND a.tablespace_name = f.tablespace_name(+)
ORDER BY capacity DESC;
######################用戶密碼過期查改
select username,account_status,PROFILE from dba_users where username='&username';
SELECT * FROM dba_profiles WHERE profile='DEFAULT' AND resource_name='PASSWORD_LIFE_TIME';
ALTER PROFILE DEFAULT LIMIT PASSWORD_LIFE_TIME UNLIMITED;
select username,account_status,PROFILE from dba_users where username='&username';
-------------------------------------------------------------------更新分割線2019-1-16------------------------------------------------
#########################表空間數(shù)據(jù)文件丟失,處理方法######################
startup mount
alter database datafile 7 offline drop; (在非歸檔模式下脫機數(shù)據(jù)文件,需要加上drop參數(shù))
alter database open;
數(shù)據(jù)庫開啟后,現(xiàn)在可以重新將表空間脫機
alter tablespace offline for recover;(當(dāng)數(shù)據(jù)文件被誤刪時,表空間的脫機命令需要加上for recover參數(shù))
##################創(chuàng)建兩個新的聯(lián)機日志文件組,并進行一次手工的日志切換
alter database add logfile group 4 ('','') size 200m;
alter database add logfile group 5 ('','') size 200m;
alter system switch logfile;
###############創(chuàng)建聯(lián)機日志文件組
alter database add logfile member '' to group 1;
alter database add logfile member '' to group 2;
alter database add logfile member '' to group 3;
###############如何轉(zhuǎn)移system表空間
1.startup mount
2.!mv
3.alter database rename file '' to '';
4.alter database open;
##############如何轉(zhuǎn)移非system表空間
1.alter tablespace offline;
2.!mv
3.alter tablespace rename datafile '' to '';
4.alter tablespace online;
###############創(chuàng)建臨時表空間組
使用臨時表空間組的好處
1.同一個用戶,在不同的session里可以使用不同的臨時表空間
每一個用戶有一個默認的臨時表,同一個用戶登錄多個session的時候,如果不使用臨時表空間組,那么所有的session使用同一個臨時表空間,容易產(chǎn)生瓶頸問題。
2.在并行操作中,不同的從屬進程可以使用不同的臨時表空間
3.在數(shù)據(jù)庫層面可以同時指定多個默認臨時表空間
create tempoary tablespace temp1 tempfile '' size 10m;
create tempoary tablespace temp2 tempfile '' size 10m;
create tempoary tablespace temp3 tempfile '' size 10m;
create tempoary tablespace temp4 tempfile '' size 10m;
alter tablespace temp1 tablespace group temp_test;
alter tablespace temp2 tablespace group temp_test;
alter tablespace temp3 tablespace group temp_test;
alter tablespace temp4 tablespace group temp_test;
############刪除臨時表空間組(當(dāng)組內(nèi)沒有成員時,該空間組自動刪除)
alter tablespace temp1 tablespace group '';
alter tablespace temp2 tablespace group '';
alter tablespace temp3 tablespace group '';
alter tablespace temp4 tablespace group '';
-------------------------------------------------------------------更新分割線2019-1-21--------------------------------------------------------------------------------------
################創(chuàng)建用戶
create user profile default identified by password expire default tablespace tempoary tablespace account unlock;
password expire :用來設(shè)置用戶口令過期,失效,強制用戶登錄數(shù)據(jù)庫時必須修改口令
account unlock:創(chuàng)建用戶的時候解鎖用戶,默認該選項
###################################查看最近7天的DB time##########################
set line 100
col DATE_TIME for a40
col STAT_NAME for a40
col per_sec for 99999
WITH sysstat AS
(select sn.begin_interval_time begin_interval_time,
sn.end_interval_time end_interval_time,
ss.stat_name stat_name,
ss.value e_value,
lag(ss.value, 1) over(order by ss.snap_id) b_value
from dba_hist_sysstat ss, dba_hist_snapshot sn
where trunc(sn.begin_interval_time) >= sysdate - 7
and ss.snap_id = sn.snap_id
and ss.dbid = sn.dbid
and ss.instance_number = sn.instance_number
and ss.dbid = (select dbid from v$database)
and ss.instance_number = (select instance_number from v$instance)
and ss.stat_name = 'DB time')
select to_char(BEGIN_INTERVAL_TIME, 'mm-dd hh34:mi') ||
to_char(END_INTERVAL_TIME, ' hh34:mi') date_time,
stat_name,
round((e_value - nvl(b_value, 0)) /
(extract(day from(end_interval_time - begin_interval_time)) * 24 * 60 * 60 +
extract(hour from(end_interval_time - begin_interval_time)) * 60 * 60 +
extract(minute from(end_interval_time - begin_interval_time)) * 60 +
extract(second from(end_interval_time - begin_interval_time))),
0) per_sec
from sysstat
where (e_value - nvl(b_value, 0)) > 0
and nvl(b_value, 0) > 0;
##############################表空間與文件和用戶對應(yīng)關(guān)聯(lián),
set line 200
col name for a60
select t.name,f.name from v$datafile f,v$tablespace t where t.ts#=f.ts# order by 1;
select t.name,count(f.name) from v$datafile f,v$tablespace t where t.ts#=f.ts# group by t.name order by 1;
select username,default_tablespace from dba_users where account_status='OPEN';
##############################表空間使用率
COLUMN ts_name format a35 heading "Tablespace"
COLUMN unalloc_size format 999,999 heading "Unalloc(MB)"
COLUMN used_size format 999,999,999 heading "Used(MB)"
COLUMN free_size format 999,999 heading "Free(MB)"
COLUMN capacity format 99,99 heading "Used_pct(%)"
SELECT a.tablespace_name ts_name
,a.unalloc_size
,nvl(f.free_size, 0) free_size
,a.used_size - nvl(f.free_size, 0) used_size
,round((a.used_size - nvl(f.free_size, 0)) /
(a.unalloc_size + a.used_size)
,2)*100 capacity
FROM (SELECT tablespace_name
,round(SUM(bytes) / 1024 / 1024) free_size
,round(AVG(bytes)/1024/1024) avg_size
FROM dba_free_space
GROUP BY tablespace_name) f
,(SELECT tablespace_name
,round(SUM(user_bytes) / 1024 / 1024) used_size
,round(SUM(decode(autoextensible
,'YES'
,decode(sign(maxbytes - user_bytes)
,-1
,0
,maxbytes - user_bytes)
,0)) / 1024 / 1024) unalloc_size
FROM dba_data_files
WHERE status='AVAILABLE'
GROUP BY tablespace_name) a
WHERE 1 = 1
AND a.tablespace_name = f.tablespace_name(+)
ORDER BY capacity DESC;
###############################################asm
sqlplus / as sysasm
select * from v$asm_operation; <==> $asmcmd lsop
asmcmd rebal --power N -- 修改磁盤組reblance的并行度
asmcmd lsdg
#################################################
——————————————————————————————————我是分割線 更新時間 2019年1月24日 ————————————————————
###########################轉(zhuǎn)載于網(wǎng)絡(luò)######################查看sga,pga等使用率
set line 100
select name,total,round(total-free,2) used, round(free,2) free,round((total-free)/total*100,2) pctused from
(select 'SGA' name,(select sum(value/1024/1024) from v$sga) total,
(select sum(bytes/1024/1024) from v$sgastat where name='free memory')free from dual)
union
select name,total,round(used,2)used,round(total-used,2)free,round(used/total*100,2)pctused from (
select 'PGA' name,(select value/1024/1024 total from v$pgastat where name='aggregate PGA target parameter')total,
(select value/1024/1024 used from v$pgastat where name='total PGA allocated')used from dual)
union
select name,round(total,2) total,round((total-free),2) used,round(free,2) free,round((total-free)/total*100,2) pctused from (
select 'Shared pool' name,(select sum(bytes/1024/1024) from v$sgastat where pool='shared pool')total,
(select bytes/1024/1024 from v$sgastat where name='free memory' and pool='shared pool') free from dual)
union
select name,round(total,2)total,round(total-free,2) used,round(free,2) free,round((total-free)/total,2) pctused from (
select 'Default pool' name,( select a.cnum_repl*(select value from v$parameter where name='db_block_size')/1024/1024 total from x$kcbwds a, v$buffer_pool p
where a.set_id=p.LO_SETID and p.name='DEFAULT' and p.block_size=(select value from v$parameter where name='db_block_size')) total,
(select a.anum_repl*(select value from v$parameter where name='db_block_size')/1024/1024 free from x$kcbwds a, v$buffer_pool p
where a.set_id=p.LO_SETID and p.name='DEFAULT' and p.block_size=(select value from v$parameter where name='db_block_size')) free from dual)
union
select name,nvl(round(total,2),0)total,nvl(round(total-free,2),0) used,nvl(round(free,2),0) free,nvl(round((total-free)/total,2),0) pctused from (
select 'KEEP pool' name,(select a.cnum_repl*(select value from v$parameter where name='db_block_size')/1024/1024 total from x$kcbwds a, v$buffer_pool p
where a.set_id=p.LO_SETID and p.name='KEEP' and p.block_size=(select value from v$parameter where name='db_block_size')) total,
(select a.anum_repl*(select value from v$parameter where name='db_block_size')/1024/1024 free from x$kcbwds a, v$buffer_pool p
where a.set_id=p.LO_SETID and p.name='KEEP' and p.block_size=(select value from v$parameter where name='db_block_size')) free from dual)
union
select name,nvl(round(total,2),0)total,nvl(round(total-free,2),0) used,nvl(round(free,2),0) free,nvl(round((total-free)/total,2),0) pctused from (
select 'RECYCLE pool' name,( select a.cnum_repl*(select value from v$parameter where name='db_block_size')/1024/1024 total from x$kcbwds a, v$buffer_pool p
where a.set_id=p.LO_SETID and p.name='RECYCLE' and p.block_size=(select value from v$parameter where name='db_block_size')) total,
(select a.anum_repl*(select value from v$parameter where name='db_block_size')/1024/1024 free from x$kcbwds a, v$buffer_pool p
where a.set_id=p.LO_SETID and p.name='RECYCLE' and p.block_size=(select value from v$parameter where name='db_block_size')) free from dual)
union
select name,nvl(round(total,2),0)total,nvl(round(total-free,2),0) used,nvl(round(free,2),0) free,nvl(round((total-free)/total,2),0) pctused from(
select 'DEFAULT 16K buffer cache' name,(select a.cnum_repl*16/1024 total from x$kcbwds a, v$buffer_pool p
where a.set_id=p.LO_SETID and p.name='DEFAULT' and p.block_size=16384) total,
(select a.anum_repl*16/1024 free from x$kcbwds a, v$buffer_pool p
where a.set_id=p.LO_SETID and p.name='DEFAULT' and p.block_size=16384) free from dual)
union
select name,nvl(round(total,2),0)total,nvl(round(total-free,2),0) used,nvl(round(free,2),0) free,nvl(round((total-free)/total,2),0) pctused from(
select 'DEFAULT 32K buffer cache' name,(select a.cnum_repl*32/1024 total from x$kcbwds a, v$buffer_pool p
where a.set_id=p.LO_SETID and p.name='DEFAULT' and p.block_size=32768) total,
(select a.anum_repl*32/1024 free from x$kcbwds a, v$buffer_pool p
where a.set_id=p.LO_SETID and p.name='DEFAULT' and p.block_size=32768) free from dual)
union
select name,total,total-free used,free, (total-free)/total*100 pctused from (
select 'Java Pool' name,(select sum(bytes/1024/1024) total from v$sgastat where pool='java pool' group by pool)total,
( select bytes/1024/1024 free from v$sgastat where pool='java pool' and name='free memory')free from dual)
union
select name,Round(total,2),round(total-free,2) used,round(free,2) free, round((total-free)/total*100,2) pctused from (
select 'Large Pool' name,(select sum(bytes/1024/1024) total from v$sgastat where pool='large pool' group by pool)total,
( select bytes/1024/1024 free from v$sgastat where pool='large pool' and name='free memory')free from dual)
order by pctused desc;
/
set line 100
select name,total,round(total-free,2) used, round(free,2) free,round((total-free)/total*100,2) pctused from
(select 'SGA' name,(select sum(value/1024/1024) from v$sga) total,
(select sum(bytes/1024/1024) from v$sgastat where name='free memory')free from dual)
union
select name,total,round(used,2)used,round(total-used,2)free,round(used/total*100,2)pctused from (
select 'PGA' name,(select value/1024/1024 total from v$pgastat where name='aggregate PGA target parameter')total,
(select value/1024/1024 used from v$pgastat where name='total PGA allocated')used from dual);
#################################################鎖相關(guān)
####------------------------------------
v$transaction
XIDUSN 表示當(dāng)前事務(wù)使用的回滾段的編號
XIDSLOT 表示該事物在回滾段頭部的事務(wù)表中對應(yīng)的記錄編號
XIDSQN 說明序列號
STATUS 說明該事物是否為活動的
select XIDUSN,XIDSLOT,XIDSQN,STATUS from v$transaction;
####-------------------------------------------
v$lock
記錄session已經(jīng)獲得的鎖定以及正在請求的鎖定的信息
SID 說明session的id
TYPE 鎖定級別,主要關(guān)注TX和TM
LMODE 已經(jīng)獲得的鎖定的模式,以數(shù)字編碼表示
0 - none
1 - null (NULL)
2 - row-S (SS)
3 - row-X (SX)
4 - share (S)
5 - S/Row-X (SSX)
6 - exclusive (X)
REQUEST 正在請求的鎖定的模式,以數(shù)字編碼表示
0 - none
1 - null (NULL)
2 - row-S (SS)
3 - row-X (SX)
4 - share (S)
5 - S/Row-X (SSX)
6 - exclusive (X)
BLOCK 是否阻止了其他用戶獲得鎖定,大于0說明是,等于0說明否
set line 100
select sid,type,id1,id2,
decode(LMODE,0,'None',1,'Null',2,'row share',3,'row exclusive',4,'share',5,'share row exclusive',6,'exclusive') lock_mode ,
decode(REQUEST,0,'None',1,'Null',2,'row share',3,'row exclusive',4,'share',5,'share row exclusive',6,'exclusive') request_mode,
block
from v$lock
where sid=&sid;
注:
type為鎖類型
對TM而言id1為表對象,id2始終為0
對TX將ID1.ID2分別對應(yīng)哪個事務(wù),
lock_mode 持有鎖
request_mode請求鎖
block 被這個鎖鎖住的
TX: 行級鎖,就一種模式,排他鎖
TM: 表級鎖,行級排他鎖
ID1的拆解
select trunc(&ID1/power(2,16)) as undo_blk#,
bitand(&ID1,to_number('ffff','xxxx')) + 0 as slot#
from dual;
###-------------
v$enqueue_lock--把正在請求的鎖列出來
其中的記錄按照申請鎖定的時間先后順序排列,先申請鎖定
的session排在前面,排在前面的session將會先獲得鎖定
###-------------
v$lock_object
記錄了當(dāng)前已經(jīng)被鎖定的對象的信息
####--------------
在數(shù)據(jù)庫系統(tǒng)中我們同時可以獲得的TX鎖定的總個數(shù)由初始化參數(shù)transaction決定,
而可以獲得TM鎖定的個數(shù)由初始化參數(shù)dml_locks決定
####--------------
dba_ddl_locks;
######################數(shù)據(jù)泵數(shù)據(jù)遷移,前后對象類型比對
select owner,object_type,count(*) from dba_objects where owner in ('&username') group by owner,object_type order by 1;
--csv--
select owner||','||object_type||','||count(*) from dba_objects where owner in ('&username') group by owner,object_type order by 1;
方便粘貼到excel表格中
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