dbms_advisor 手动生成段顾问建议！
执行包需要dbms_advisor权限：
sys@ORCL> grant advisor to u1; 授权成功。创建段顾问任务，指定create_task的advisor_name参数为“段顾问”。查询dba_advisor_definitions来获得所有有效的顾问列表。
u1@ORCL> select * from dba_advisor_definitions;
ADVISOR_ID ADVISOR_NAME PROPERTY
---------- ------------------------------ ----------
1 ADDM 1
2 SQL Access Advisor 271
3 Undo Advisor 1
4 SQL Tuning Advisor 935
5 Segment Advisor 3
6 SQL Workload Manager 0
7 Tune MView 31
8 SQL Performance Analyzer 935
9 SQL Repair Advisor 679
10 Compression Advisor 3
已选择10行。 手动执行段顾问：
sys@ORCL> DECLARE
2 my_task_id number;
3 obj_id number;
4 my_task_name varchar2(100);
5 my_task_desc varchar2(500);
6 BEGIN
7 my_task_name := 'BIG_TABLE Advice';
my_task_desc := 'Manual Segment Advisor Run';
9 ---------
10 -- Step 1 创建一个任务
11 ---------
12 dbms_advisor.create_task (
13 advisor_name => 'Segment Advisor',
14 task_id => my_task_id,
15 task_name => my_task_name,
16 task_desc => my_task_desc);
17 ---------
18 -- Step 2 为这个任务分配一个对象
19 ---------
20 dbms_advisor.create_object (
21 task_name => my_task_name,
22 object_type => 'TABLE',
23 attr1 => 'U1',
24 attr2 => 'BIG_TABLE',
25 attr3 => NULL,
26 attr4 => NULL,
27 attr5 => NULL,
28 object_id => obj_id);
29 ---------
30 -- Step 3 设置任务参数
31 ---------
32 dbms_advisor.set_task_parameter(
33 task_name => my_task_name,
34 parameter => 'recommend_all',
value => 'TRUE');
---------
37 -- Step 4 执行这个任务
38 ---------
39 dbms_advisor.execute_task(my_task_name);
40 END;
41 /
PL/SQL 过程已成功完成。
sys@ORCL> SELECT
2 'Segment Advice --------------------------'|| chr(10) ||
3 'TABLESPACE_NAME : ' || tablespace_name || chr(10) ||
4 'SEGMENT_OWNER : ' || segment_owner || chr(10) ||
5 'SEGMENT_NAME : ' || segment_name || chr(10) ||
6 'ALLOCATED_SPACE : ' || allocated_space || chr(10) ||
7 'RECLAIMABLE_SPACE: ' || reclaimable_space || chr(10) ||
8 'RECOMMENDATIONS : ' || recommendations || chr(10) ||
9 'SOLUTION 1 : ' || c1 || chr(10) ||
10 'SOLUTION 2 : ' || c2 || chr(10) ||
11 'SOLUTION 3 : ' || c3 Advice
12 FROM
13 TABLE(dbms_space.asa_recommendations('TRUE', 'TRUE', 'FALSE'));
ADVICE
--------------------------------------------------------------------------------
Segment Advice --------------------------
TABLESPACE_NAME : USERS
SEGMENT_OWNER : QYV
SEGMENT_NAME : BIG_TABLE
ALLOCATED_SPACE : 125829120
RECLAIMABLE_SPACE: 81788928
RECOMMENDATIONS : 压缩对象 QYV.BIG_TABLE, 估计可以节省 81788928 字节。
SOLUTION 1 : alter table "QYV"."BIG_TABLE" compress for oltp
SOLUTION 2 : alter table "QYV"."BIG_TABLE" move
SOLUTION 3 :
Segment Advice --------------------------
TABLESPACE_NAME : USERS
SEGMENT_OWNER : U1
SEGMENT_NAME : BIG_TABLE
ALLOCATED_SPACE : 125829120
RECLAIMABLE_SPACE: 109535475
RECOMMENDATIONS : 启用表 U1.BIG_TABLE 的行移动并执行收缩, 估计可以节省 10953547
5 字节。
SOLUTION 1 : alter table "U1"."BIG_TABLE" shrink space
SOLUTION 2 : alter table "U1"."BIG_TABLE" shrink space COMPACT
SOLUTION 3 : alter table "U1"."BIG_TABLE" enable row movement
Segment Advice --------------------------
TABLESPACE_NAME : USERS
SEGMENT_OWNER : U1
SEGMENT_NAME : TT
ALLOCATED_SPACE : 27262976
RECLAIMABLE_SPACE: 17314513
RECOMMENDATIONS : 启用表 U1.TT 的行移动并执行收缩, 估计可以节省 17314513 字节。
SOLUTION 1 : alter table "U1"."TT" shrink space
SOLUTION 2 : alter table "U1"."TT" shrink space COMPACT
SOLUTION 3 : alter table "U1"."TT" enable row movement
sys@ORCL> SELECT
2 'Task Name : ' || f.task_name || chr(10) ||
3 'Segment Name : ' || o.attr2 || chr(10) ||
4 'Segment Type : ' || o.type || chr(10) ||
5 'Partition Name : ' || o.attr3 || chr(10) ||
6 'Message : ' || f.message || chr(10) ||
7 'More Info : ' || f.more_info TASK_ADVICE
8 FROM dba_advisor_findings f
9 ,dba_advisor_objects o
10 WHERE o.task_id = f.task_id
11 AND o.object_id = f.object_id
12 AND f.task_name like 'BIG_TABLE Advice'
13 ORDER BY f.task_name;
TASK_ADVICE
-----------------------------------------------------------------------------------------------------------------------------------
Task Name : BIG_TABLE Advice
Segment Name : BIG_TABLE
Segment Type : TABLE
Partition Name :
Message : 启用表 U1.BIG_TABLE 的行移动并执行收缩, 估计可以节省 109535475 字节。
More Info : 分配空间:125829120: 已用空间:16293645: 可回收空间:109535475:
Task Name : BIG_TABLE Advice
Segment Name : BIG_TABLE
Segment Type : TABLE
Partition Name :
Message : 启用表 U1.BIG_TABLE 的行移动并执行收缩, 估计可以节省 109535475 字节。
More Info : 分配空间:125829120: 已用空间:16293645: 可回收空间:109535475:
删除一个任务：
u1@ORCL> exec dbms_advisor.delete_task('BIG_TABLE Advice');
PL/SQL 过程已成功完成。