标签归档：Optimizer Statistics Advisor

12.2的sysaux表空间使用过大

SQL> select * from v$version;

BANNER                                                                               CON_ID
-------------------------------------------------------------------------------- ----------
Oracle Database 12c Enterprise Edition Release 12.2.0.1.0 - 64bit Production              0
PL/SQL Release 12.2.0.1.0 - Production                                                    0
CORE    12.2.0.1.0      Production                                                        0
TNS for Linux: Version 12.2.0.1.0 - Production                                            0
NLSRTL Version 12.2.0.1.0 - Production                                                    0

SQL> @tbs

Name      TS Type      All Size(MB)   Max Size(MB)  Free Size(MB)  Max Free Pct. Free Max Free%
--------- ---------- -------------- -------------- -------------- --------- --------- ---------
SYSAUX    PERMANENT          32,760         32,768             26        34         0         0
USERS     PERMANENT           1,784         32,768             85    31,069         5        95
SYSTEM    PERMANENT             860         32,768             10    31,917         1        97
R_INDEX   PERMANENT           5,900        229,376            927   224,403        16        98
RICHMAN   PERMANENT           3,000        196,608          1,895   195,503        63        99
UNDOTBS1  UNDO                1,600         32,768          1,560    32,728        97       100

6 rows selected.

awrinfo查看

********************************************************
(1b) SYSAUX occupants space usage (v$sysaux_occupants)
********************************************************
|
| Occupant Name        Schema Name               Space Usage
| -------------------- -------------------- ----------------
| SM/ADVISOR           SYS                       30,422.9 MB
| SM/OPTSTAT           SYS                        1,222.7 MB
| SM/AWR               SYS                          588.2 MB
| SM/OTHER             SYS                          152.4 MB

**********************************
(4) Space usage by non-AWR components (> 500K)
**********************************

COMPONENT        MB SEGMENT_NAME                                      SEGMENT_TYPE
--------- --------- ------------------------------------------------- -------------
NON_AWR    15,675.0 SYS.WRI$_ADV_OBJECTS                              TABLE
NON_AWR     8,764.0 SYS.WRI$_ADV_OBJECTS_IDX_01                       INDEX
NON_AWR     5,959.0 SYS.WRI$_ADV_OBJECTS_PK                           INDEX
NON_AWR       488.0 SYS.I_WRI$_OPTSTAT_H_OBJ#_ICOL#_ST                INDEX
NON_AWR       249.0 SYS.I_WRI$_OPTSTAT_H_ST                           INDEX

这里为ADVISOR功能模块导致，而且主要是WRI$_ADV_OBJECTS表及其索引
分析主要对象

SQL>  COL SEGMENT_NAME FORMAT A30
SQL>  COL OWNER FORMAT A10
SQL>  COL TABLESPACE_NAME FORMAT A10
SQL>  COL SEGMENT_TYPE FORMAT A15
SQL> SELECT * FROM (SELECT SEGMENT_NAME,OWNER,TABLESPACE_NAME,BYTES/1024/1024 
 2  "SIZE(MB)",SEGMENT_TYPE FROM DBA_SEGMENTS WHERE 
 3  TABLESPACE_NAME='SYSAUX' ORDER BY BYTES DESC) WHERE ROWNUM<=10;

SEGMENT_NAME                   OWNER      Name         SIZE(MB) SEGMENT_TYPE
------------------------------ ---------- ---------- ---------- ---------------
WRI$_ADV_OBJECTS               SYS        SYSAUX          15675 TABLE
WRI$_ADV_OBJECTS_IDX_01        SYS        SYSAUX           8764 INDEX
WRI$_ADV_OBJECTS_PK            SYS        SYSAUX           5959 INDEX
I_WRI$_OPTSTAT_H_OBJ#_ICOL#_ST SYS        SYSAUX            488 INDEX
I_WRI$_OPTSTAT_H_ST            SYS        SYSAUX            249 INDEX
SYS_LOB0000007350C00005$$      SYS        SYSAUX       133.1875 LOBSEGMENT
SYS_LOB0000010641C00038$$      SYS        SYSAUX       110.1875 LOBSEGMENT
WRH$_SQL_PLAN                  SYS        SYSAUX             64 TABLE
I_WRI$_OPTSTAT_HH_OBJ_ICOL_ST  SYS        SYSAUX             51 INDEX
SYS_LOB0000067470C00006$$      MDSYS      SYSAUX        50.1875 LOBSEGMENT

10 rows selected.

这里也比较明显主要是由于WRI$_ADV_OBJECTS表及其index占用空间较多导致.WRI$_ADV_OBJECTS表主要是12.2新特性Optimizer Statistics Advisor功能使用到的表,用来存储相关数据

清理WRI$_ADV_OBJECTS相关数据

DECLARE
v_tname VARCHAR2(32767);
BEGIN
v_tname := 'AUTO_STATS_ADVISOR_TASK';
DBMS_STATS.DROP_ADVISOR_TASK(v_tname);
END;
/

EXEC DBMS_STATS.INIT_PACKAGE();

ALTER TABLE WRI$_ADV_OBJECTS MOVE;
ALTER INDEX WRI$_ADV_OBJECTS_IDX_01 REBUILD;
ALTER INDEX WRI$_ADV_OBJECTS_PK REBUILD;

禁用Optimizer Statistics Advisor Task

DECLARE
filter1 CLOB;
BEGIN
filter1 := DBMS_STATS.CONFIGURE_ADVISOR_RULE_FILTER('AUTO_STATS_ADVISOR_TASK','EXECUTE',NULL,'DISABLE');
END;
/

参考文档：SYSAUX Tablespace Grows Rapidly After Upgrading Database to 12.2.0.1 Due To Statistics Advisor (Doc ID 2305512.1)