search
HomeDatabaseMysql TutorialOracle数据字典表Truncate掉导致数据库不可用及对策

在实际的工作环境下,如果你在操作时将数据库内的几个数据字典表Truncate掉,将会直接导致数据库不能再继续使用,本文将针对一个

在实际的工作环境下,如果你在操作时将数据库内的几个数据字典表Truncate掉,将会直接导致数据库不能再继续使用,本文将针对一个相关案例进行详细的讲解。

案例如下:

数据库环境:Oracle数据库9.2.0.7 RAC。(注:由于数据库的事务量体别大,所以数据库没有进行备份)。


检查后发现的被截断表:


SQL> select object_name,object_type from dba_objects where object_name like 'IDL%';

OBJECT_NAME            OBJECT_TYPE
------------------- ------------------
IDL_CHAR$                 TABLE
IDL_SB4$                  TABLE
IDL_UB1$                  TABLE
IDL_UB2$                  TABLE

IDL_UB1$表是特别重要的字典表,,只要出现故障,数据库就会出现大量的ORA-00600错误,所有事务将不能进行。


ORA-00600: internal error code, arguments: [17069],

[0xC0000000DDDFA690], [], [], [], [], [], []


ORA-600 17069错误是一个特别难解决的问题,问题出现后数据库的某个跟踪日志很快就会出现暴涨的情况,因为IDL系列字典表是记录数据库对象编译信息的,丢失了其中的数据,所有过程、Package等都将无法执行。

字典表作用的说明:


IDL_UB1$ is one of four tables that hold compiled PL/SQL code:

IDL_UB1$
IDL_CHAR$
IDL_UB2$
IDL_SB4$

"PL/SQL is based on the programming language Ada. As a result, PL/SQL uses a
variant of Descriptive Intermediate Attributed Notation for Ada (DIANA), which
is a tree-structured intermediate language. It is defined using a meta-notation
called Interface Definition Language (IDL). DIANA provides for communication
internal to compilers and other tools.

"At compile time, PL/SQL source code is translated into machine-readable
m-code.Both the DIANA and m-code for a procedure or package are stored in the
database.At run time, they are loaded into the shared (memory) pool. The DIANA is
used to compile dependent procedures; the m-code is simply executed."

These four tables hold the DIANA and the so-code m-code. I think "m-code" is
short for machine-dependent byte code but there is a sizable machine-indenpendent part

as well. If you have a look at sql.bsq, you can see
that Oracle documents the "type" column of these tables as follows:
part number not null,
/* part: 0 = diana, 1 = portable pcode,
2 = machine-dependentpcode */


如果出现更为严重的情况,它将导致大量系统DBMS包失效,其重新编译也将更为复杂。

恢复数据库,消除所有ORA-600错误的方法:

恢复的方法是通过运行相关的脚本,重建和重新编译所有Procedure/Trigger/Package等对象,重新生成这些对象的DIANA和so-code m-code,主要包括catlog.sql,catproc.sql等脚本。

linux

Statement
The content of this article is voluntarily contributed by netizens, and the copyright belongs to the original author. This site does not assume corresponding legal responsibility. If you find any content suspected of plagiarism or infringement, please contact admin@php.cn
How does MySQL handle data replication?How does MySQL handle data replication?Apr 28, 2025 am 12:25 AM

MySQL processes data replication through three modes: asynchronous, semi-synchronous and group replication. 1) Asynchronous replication performance is high but data may be lost. 2) Semi-synchronous replication improves data security but increases latency. 3) Group replication supports multi-master replication and failover, suitable for high availability requirements.

How can you use the EXPLAIN statement to analyze query performance?How can you use the EXPLAIN statement to analyze query performance?Apr 28, 2025 am 12:24 AM

The EXPLAIN statement can be used to analyze and improve SQL query performance. 1. Execute the EXPLAIN statement to view the query plan. 2. Analyze the output results, pay attention to access type, index usage and JOIN order. 3. Create or adjust indexes based on the analysis results, optimize JOIN operations, and avoid full table scanning to improve query efficiency.

How do you back up and restore a MySQL database?How do you back up and restore a MySQL database?Apr 28, 2025 am 12:23 AM

Using mysqldump for logical backup and MySQLEnterpriseBackup for hot backup are effective ways to back up MySQL databases. 1. Use mysqldump to back up the database: mysqldump-uroot-pmydatabase>mydatabase_backup.sql. 2. Use MySQLEnterpriseBackup for hot backup: mysqlbackup--user=root-password=password--backup-dir=/path/to/backupbackup. When recovering, use the corresponding life

What are some common causes of slow queries in MySQL?What are some common causes of slow queries in MySQL?Apr 28, 2025 am 12:18 AM

The main reasons for slow MySQL query include missing or improper use of indexes, query complexity, excessive data volume and insufficient hardware resources. Optimization suggestions include: 1. Create appropriate indexes; 2. Optimize query statements; 3. Use table partitioning technology; 4. Appropriately upgrade hardware.

What are views in MySQL?What are views in MySQL?Apr 28, 2025 am 12:04 AM

MySQL view is a virtual table based on SQL query results and does not store data. 1) Views simplify complex queries, 2) Enhance data security, and 3) Maintain data consistency. Views are stored queries in databases that can be used like tables, but data is generated dynamically.

What are the differences in syntax between MySQL and other SQL dialects?What are the differences in syntax between MySQL and other SQL dialects?Apr 27, 2025 am 12:26 AM

MySQLdiffersfromotherSQLdialectsinsyntaxforLIMIT,auto-increment,stringcomparison,subqueries,andperformanceanalysis.1)MySQLusesLIMIT,whileSQLServerusesTOPandOracleusesROWNUM.2)MySQL'sAUTO_INCREMENTcontrastswithPostgreSQL'sSERIALandOracle'ssequenceandt

What is MySQL partitioning?What is MySQL partitioning?Apr 27, 2025 am 12:23 AM

MySQL partitioning improves performance and simplifies maintenance. 1) Divide large tables into small pieces by specific criteria (such as date ranges), 2) physically divide data into independent files, 3) MySQL can focus on related partitions when querying, 4) Query optimizer can skip unrelated partitions, 5) Choosing the right partition strategy and maintaining it regularly is key.

How do you grant and revoke privileges in MySQL?How do you grant and revoke privileges in MySQL?Apr 27, 2025 am 12:21 AM

How to grant and revoke permissions in MySQL? 1. Use the GRANT statement to grant permissions, such as GRANTALLPRIVILEGESONdatabase_name.TO'username'@'host'; 2. Use the REVOKE statement to revoke permissions, such as REVOKEALLPRIVILEGESONdatabase_name.FROM'username'@'host' to ensure timely communication of permission changes.

See all articles

Hot AI Tools

Undresser.AI Undress

Undresser.AI Undress

AI-powered app for creating realistic nude photos

AI Clothes Remover

AI Clothes Remover

Online AI tool for removing clothes from photos.

Undress AI Tool

Undress AI Tool

Undress images for free

Clothoff.io

Clothoff.io

AI clothes remover

Video Face Swap

Video Face Swap

Swap faces in any video effortlessly with our completely free AI face swap tool!

Hot Tools

SublimeText3 Chinese version

SublimeText3 Chinese version

Chinese version, very easy to use

Safe Exam Browser

Safe Exam Browser

Safe Exam Browser is a secure browser environment for taking online exams securely. This software turns any computer into a secure workstation. It controls access to any utility and prevents students from using unauthorized resources.

EditPlus Chinese cracked version

EditPlus Chinese cracked version

Small size, syntax highlighting, does not support code prompt function

SublimeText3 Linux new version

SublimeText3 Linux new version

SublimeText3 Linux latest version

SecLists

SecLists

SecLists is the ultimate security tester's companion. It is a collection of various types of lists that are frequently used during security assessments, all in one place. SecLists helps make security testing more efficient and productive by conveniently providing all the lists a security tester might need. List types include usernames, passwords, URLs, fuzzing payloads, sensitive data patterns, web shells, and more. The tester can simply pull this repository onto a new test machine and he will have access to every type of list he needs.