本想使用dbms_advisor做一个sql access advisor测试,不料却遇ORA-13600 QSM-00794报错
1、 本想使用dbms_advisor做一个sql access advisor测试,,不料却遇ORA-13600 QSM-00794报错,如下:
SQL> DECLARE
2 task_name VARCHAR2(200);
3 BEGIN
4 task_name := 'My_Task';
5 DBMS_ADVISOR.QUICK_TUNE(DBMS_ADVISOR.SQLACCESS_ADVISOR,'My_Task',
6 'select * from system.litest_8 where object_id=20');
7 END;
8 /
DECLARE
*
ERROR at line 1:
ORA-13600: error encountered in Advisor
QSM-00794: the statement can not be stored due to a violation of the invalid
table reference filter
ORA-06512: at "SYS.PRVT_ACCESS_ADVISOR", line 1809
ORA-06512: at "SYS.WRI$_ADV_SQLACCESS_ADV", line 180
ORA-06512: at "SYS.PRVT_ADVISOR", line 3678
ORA-06512: at "SYS.DBMS_ADVISOR", line 711
ORA-06512: at line 5
注意上面标
2、上metalink上查原因,发现有文章ID:403358.1中做了详细原因描述
SQL Access Advisor maintains an internal list of non-tunable tables regardless of the contents of
the INVALID_TABLE_LIST parameter.
No table that is owned by SYS, SYSTEM or any other pre-defined Oracle schema can be tuned.
看来原因是因为dbms_advisor.quick_tune不支持为SYS和SYSTEM两个用户的表的顾问功能了。
3、将测试的表改到其他用户下试试
3.1 在litest这个用户下创建表
SQL> system.litest_8
3.2 重新用DBMS_ADVISOR.QUICK_TUNE使用sql access advisor功能
SQL> DECLARE
2 task_name VARCHAR2(200);
3 BEGIN
4 task_name := 'My_Task';
5 DBMS_ADVISOR.QUICK_TUNE(DBMS_ADVISOR.SQLACCESS_ADVISOR,'My_Task',
6 'select * from litest.litest_8 where object_id=20');
7 END;
8 /
PL/SQL procedure successfully completed.
注意上面标绿色部分,更换成了litest(非SYS或SYSTEM用户了)
Linux-6-64下安装Oracle 12C笔记
在CentOS 6.4下安装Oracle 11gR2(x64)
Oracle 11gR2 在VMWare虚拟机中安装步骤
Debian 下 安装 Oracle 11g XE R2
Oracle数据库查看使用默认密码的用户信息
本文永久更新链接地址:

ACID attributes include atomicity, consistency, isolation and durability, and are the cornerstone of database design. 1. Atomicity ensures that the transaction is either completely successful or completely failed. 2. Consistency ensures that the database remains consistent before and after a transaction. 3. Isolation ensures that transactions do not interfere with each other. 4. Persistence ensures that data is permanently saved after transaction submission.

MySQL is not only a database management system (DBMS) but also closely related to programming languages. 1) As a DBMS, MySQL is used to store, organize and retrieve data, and optimizing indexes can improve query performance. 2) Combining SQL with programming languages, embedded in Python, using ORM tools such as SQLAlchemy can simplify operations. 3) Performance optimization includes indexing, querying, caching, library and table division and transaction management.

MySQL uses SQL commands to manage data. 1. Basic commands include SELECT, INSERT, UPDATE and DELETE. 2. Advanced usage involves JOIN, subquery and aggregate functions. 3. Common errors include syntax, logic and performance issues. 4. Optimization tips include using indexes, avoiding SELECT* and using LIMIT.

MySQL is an efficient relational database management system suitable for storing and managing data. Its advantages include high-performance queries, flexible transaction processing and rich data types. In practical applications, MySQL is often used in e-commerce platforms, social networks and content management systems, but attention should be paid to performance optimization, data security and scalability.

The relationship between SQL and MySQL is the relationship between standard languages and specific implementations. 1.SQL is a standard language used to manage and operate relational databases, allowing data addition, deletion, modification and query. 2.MySQL is a specific database management system that uses SQL as its operating language and provides efficient data storage and management.

InnoDB uses redologs and undologs to ensure data consistency and reliability. 1.redologs record data page modification to ensure crash recovery and transaction persistence. 2.undologs records the original data value and supports transaction rollback and MVCC.

Key metrics for EXPLAIN commands include type, key, rows, and Extra. 1) The type reflects the access type of the query. The higher the value, the higher the efficiency, such as const is better than ALL. 2) The key displays the index used, and NULL indicates no index. 3) rows estimates the number of scanned rows, affecting query performance. 4) Extra provides additional information, such as Usingfilesort prompts that it needs to be optimized.

Usingtemporary indicates that the need to create temporary tables in MySQL queries, which are commonly found in ORDERBY using DISTINCT, GROUPBY, or non-indexed columns. You can avoid the occurrence of indexes and rewrite queries and improve query performance. Specifically, when Usingtemporary appears in EXPLAIN output, it means that MySQL needs to create temporary tables to handle queries. This usually occurs when: 1) deduplication or grouping when using DISTINCT or GROUPBY; 2) sort when ORDERBY contains non-index columns; 3) use complex subquery or join operations. Optimization methods include: 1) ORDERBY and GROUPB


Hot AI Tools

Undresser.AI Undress
AI-powered app for creating realistic nude photos

AI Clothes Remover
Online AI tool for removing clothes from photos.

Undress AI Tool
Undress images for free

Clothoff.io
AI clothes remover

AI Hentai Generator
Generate AI Hentai for free.

Hot Article

Hot Tools

Atom editor mac version download
The most popular open source editor

MinGW - Minimalist GNU for Windows
This project is in the process of being migrated to osdn.net/projects/mingw, you can continue to follow us there. MinGW: A native Windows port of the GNU Compiler Collection (GCC), freely distributable import libraries and header files for building native Windows applications; includes extensions to the MSVC runtime to support C99 functionality. All MinGW software can run on 64-bit Windows platforms.

EditPlus Chinese cracked version
Small size, syntax highlighting, does not support code prompt function

Dreamweaver Mac version
Visual web development tools

Notepad++7.3.1
Easy-to-use and free code editor