[20181007]12cR2 Using SQL Patch.txt
--//12cR2 已经把sql打补丁集成进入dbms_sqldiag,不是11g的 DBMS_SQLDIAG_INTERNAL.I_CREATE_PATCH .做一个记录.
--//以前的链接:http://blog.itpub.net/267265/viewspace-751900/=>[20121231]给sql打补丁.txt
1.环境:
SCOTT@test01p> @ ver1
PORT_STRING VERSION BANNER CON_ID
------------------------------ -------------- -------------------------------------------------------------------------------- ----------
IBMPC/WIN_NT64-9.1.0 12.2.0.1.0 Oracle Database 12c Enterprise Edition Release 12.2.0.1.0 - 64bit Production 0
SCOTT@test01p> @ desc_proc sys dbms_sqldiag create_sql_patch
INPUT OWNER PACKAGE_NAME OBJECT_NAME
sample : @desc_proc sys dbms_stats gather_%_stats
OWNER PACKAGE_NAME OBJECT_NAME SEQUENCE ARGUMENT_NAME DATA_TYPE IN_OUT DATA_TYPE DEFAULTED
---------- -------------------- ---------------- -------- -------------------- -------------------- --------- -------------------- ----------
SYS DBMS_SQLDIAG CREATE_SQL_PATCH 1 VARCHAR2 OUT VARCHAR2 N
2 SQL_ID VARCHAR2 IN VARCHAR2 N
3 HINT_TEXT CLOB IN CLOB N
4 NAME VARCHAR2 IN VARCHAR2 Y
5 DESCRIPTION VARCHAR2 IN VARCHAR2 Y
6 CATEGORY VARCHAR2 IN VARCHAR2 Y
7 VALIDATE PL/SQL BOOLEAN IN PL/SQL BOOLEAN Y
1 VARCHAR2 OUT VARCHAR2 N
2 SQL_TEXT CLOB IN CLOB N
3 HINT_TEXT CLOB IN CLOB N
4 NAME VARCHAR2 IN VARCHAR2 Y
5 DESCRIPTION VARCHAR2 IN VARCHAR2 Y
6 CATEGORY VARCHAR2 IN VARCHAR2 Y
7 VALIDATE PL/SQL BOOLEAN IN PL/SQL BOOLEAN Y
14 rows selected.
2.测试:
SCOTT@test01p> select /*+ full(dept) */ * from dept where deptno=10;
DEPTNO DNAME LOC
----------------- -------------------- -------------
10 ACCOUNTING NEW YORK
SCOTT@test01p> @ dpc '' ''
PLAN_TABLE_OUTPUT
-------------------------------------
SQL_ID g0qybdz1796cn, child number 0
-------------------------------------
select /*+ full(dept) */ * from dept where deptno=10
Plan hash value: 3383998547
---------------------------------------------------------------------------
| Id | Operation | Name | E-Rows |E-Bytes| Cost (%CPU)| E-Time |
---------------------------------------------------------------------------
| 0 | SELECT STATEMENT | | | | 3 (100)| |
|* 1 | TABLE ACCESS FULL| DEPT | 1 | 20 | 3 (0)| 00:00:01 |
---------------------------------------------------------------------------
Query Block Name / Object Alias (identified by operation id):
-------------------------------------------------------------
1 - SEL$1 / DEPT@SEL$1
Predicate Information (identified by operation id):
---------------------------------------------------
1 - filter("DEPTNO"=10)
--//sql_id=g0qybdz1796cn,实际上走索引更佳.注意多执行几次保留在共享池.
SCOTT@test01p> variable patch_name varchar2(2000);
SCOTT@test01p> exec :patch_name := dbms_sqldiag.create_sql_patch(sql_id=>'g0qybdz1796cn',hint_text=>'index(dept pk_dept)');
PL/SQL procedure successfully completed.
--//现在居然scott用户就可以执行,我记忆里以前不行,必须sys用户执行.
SCOTT@test01p> print :patch_name
PATCH_NAME
------------------------------------------
SYS_SQLPTCH_01664e9a59810003
--//相关信息记录在视图DBA_SQL_PATCHES.
SCOTT@test01p> select NAME c30,SQL_TEXT from DBA_SQL_PATCHES;
C30 SQL_TEXT
------------------------------ ------------------------------------------------------------
SYS_SQLPTCH_01664e9a59810003 select /*+ full(dept) */ * from dept where deptno=10
SCOTT@test01p> select /*+ full(dept) */ * from dept where deptno=10;
DEPTNO DNAME LOC
----------------- -------------------- -------------
10 ACCOUNTING NEW YORK
SCOTT@test01p> @ dpc '' ''
PLAN_TABLE_OUTPUT
-------------------------------------
SQL_ID g0qybdz1796cn, child number 0
-------------------------------------
select /*+ full(dept) */ * from dept where deptno=10
Plan hash value: 3383998547
---------------------------------------------------------------------------
| Id | Operation | Name | E-Rows |E-Bytes| Cost (%CPU)| E-Time |
---------------------------------------------------------------------------
| 0 | SELECT STATEMENT | | | | 3 (100)| |
|* 1 | TABLE ACCESS FULL| DEPT | 1 | 20 | 3 (0)| 00:00:01 |
---------------------------------------------------------------------------
Query Block Name / Object Alias (identified by operation id):
-------------------------------------------------------------
1 - SEL$1 / DEPT@SEL$1
Predicate Information (identified by operation id):
---------------------------------------------------
1 - filter("DEPTNO"=10)
Note
-----
- SQL patch "SYS_SQLPTCH_01664e9a59810003" used for this statement
--//没有起作用.实际上不能使用这样的提示.执行如下:
select * from dept where deptno=10;
--//再看执行计划提示:
SCOTT@test01p> @ dpc '' outline
...
Outline Data
-------------
/*+
BEGIN_OUTLINE_DATA
IGNORE_OPTIM_EMBEDDED_HINTS
OPTIMIZER_FEATURES_ENABLE('12.2.0.1')
DB_VERSION('12.2.0.1')
ALL_ROWS
OUTLINE_LEAF(@"SEL$1")
INDEX_RS_ASC(@"SEL$1" "DEPT"@"SEL$1" ("DEPT"."DEPTNO"))
END_OUTLINE_DATA
*/
--//使用提示INDEX_RS_ASC(@"SEL$1" "DEPT"@"SEL$1" ("DEPT"."DEPTNO")).才行.
SCOTT@test01p> exec dbms_sqldiag.drop_sql_patch(name=>'SYS_SQLPTCH_01664e9a59810003');
PL/SQL procedure successfully completed.
SCOTT@test01p> exec :patch_name := dbms_sqldiag.create_sql_patch(sql_id=>'g0qybdz1796cn',hint_text=>'INDEX_RS_ASC(@"SEL$1" "DEPT"@"SEL$1" ("DEPT"."DEPTNO"))');
PL/SQL procedure successfully completed.
SCOTT@test01p> print :patch_name
PATCH_NAME
------------------------------------
SYS_SQLPTCH_01664ea1bc190004
SCOTT@test01p> select /*+ full(dept) */ * from dept where deptno=10;
DEPTNO DNAME LOC
----------------- -------------------- -------------
10 ACCOUNTING NEW YORK
SCOTT@test01p> @ dpc '' ''
PLAN_TABLE_OUTPUT
-------------------------------------
SQL_ID g0qybdz1796cn, child number 0
-------------------------------------
select /*+ full(dept) */ * from dept where deptno=10
Plan hash value: 2852011669
----------------------------------------------------------------------------------------
| Id | Operation | Name | E-Rows |E-Bytes| Cost (%CPU)| E-Time |
----------------------------------------------------------------------------------------
| 0 | SELECT STATEMENT | | | | 1 (100)| |
| 1 | TABLE ACCESS BY INDEX ROWID| DEPT | 1 | 20 | 1 (0)| 00:00:01 |
|* 2 | INDEX UNIQUE SCAN | PK_DEPT | 1 | | 0 (0)| |
----------------------------------------------------------------------------------------
Query Block Name / Object Alias (identified by operation id):
-------------------------------------------------------------
1 - SEL$1 / DEPT@SEL$1
2 - SEL$1 / DEPT@SEL$1
Predicate Information (identified by operation id):
---------------------------------------------------
2 - access("DEPTNO"=10)
Note
-----
- SQL patch "SYS_SQLPTCH_01664ea1bc190004" used for this statement
- Warning: basic plan statistics not available. These are only collected when:
* hint 'gather_plan_statistics' is used for the statement or
* parameter 'statistics_level' is set to 'ALL', at session or system level
--//OK,现在起作用了.
3.我个人认为sql打补丁最佳方式是加BIND_AWARE或者result_cache提示,其它情况我很少使用.
--//我记忆里11g下不能加result_cache,再加这个提示看看.
SCOTT@test01p> exec dbms_sqldiag.drop_sql_patch(name=>'SYS_SQLPTCH_01664ea1bc190004');
PL/SQL procedure successfully completed.
SCOTT@test01p> exec :patch_name := dbms_sqldiag.create_sql_patch(sql_id=>'g0qybdz1796cn',hint_text=>'result_cache INDEX_RS_ASC(@"SEL$1" "DEPT"@"SEL$1" ("DEPT"."DEPTNO"))');
PL/SQL procedure successfully completed.
SCOTT@test01p> Select /*+ full(dept) */ * from dept where deptno=10;
DEPTNO DNAME LOC
----------------- -------------------- -------------
10 ACCOUNTING NEW YORK
--//我修改select=>Select.
SCOTT@test01p> @ dpc '' ''
PLAN_TABLE_OUTPUT
-------------------------------------
SQL_ID 4sg4rbwu9r59q, child number 0
-------------------------------------
Select /*+ full(dept) */ * from dept where deptno=10
Plan hash value: 2852011669
------------------------------------------------------------------------------------------------------------
| Id | Operation | Name | E-Rows |E-Bytes| Cost (%CPU)| E-Time |
------------------------------------------------------------------------------------------------------------
| 0 | SELECT STATEMENT | | | | 1 (100)| |
| 1 | RESULT CACHE | 364dg0urjj61xc7was3s7u5hcj | | | | |
| 2 | TABLE ACCESS BY INDEX ROWID| DEPT | 1 | 20 | 1 (0)| 00:00:01 |
|* 3 | INDEX UNIQUE SCAN | PK_DEPT | 1 | | 0 (0)| |
------------------------------------------------------------------------------------------------------------
Query Block Name / Object Alias (identified by operation id):
-------------------------------------------------------------
1 - SEL$1
2 - SEL$1 / DEPT@SEL$1
3 - SEL$1 / DEPT@SEL$1
Predicate Information (identified by operation id):
---------------------------------------------------
3 - access("DEPTNO"=10)
Result Cache Information (identified by operation id):
------------------------------------------------------
1 -
Note
-----
- SQL patch "SYS_SQLPTCH_01664eab2c7a0006" used for this statement
- Warning: basic plan statistics not available. These are only collected when:
* hint 'gather_plan_statistics' is used for the statement or
* parameter 'statistics_level' is set to 'ALL', at session or system level
--//OK,12c已经修复这个问题.
4.自己还有1个疑问,如何看到以前的提示:
SCOTT@test01p> select text_vc c100 from dba_views where view_name='DBA_SQL_PATCHES';
C100
----------------------------------------------------------------------------------------------------
SELECT
so.name, so.category, so.signature, st.sql_text,
ad.created, ad.last_modified, ad.description,
DECODE(BITAND(so.flags, 1), 1, 'ENABLED', 'DISABLED'),
DECODE(BITAND(sq.flags, 1), 1, 'YES', 'NO'),
ad.task_id, ad.task_exec_name, ad.task_obj_id, ad.task_fnd_id,
ad.task_rec_id
FROM
sqlobj$ so,
sqlobj$auxdata ad,
sql$text st,
sql$ sq
WHERE
so.signature = st.signature AND
so.signature = ad.signature AND
so.category = ad.category AND
so.signature = sq.signature AND
so.obj_type = 3 AND
ad.obj_type = 3
--//这几个表都没有查询到提示信息,另外写一篇文章分析看看.