Oracle 数据库存储结构健康检查ParnassusData 诗檀软件

Senior Product Management DirectorMaclean Liu

古希腊的Delphi(世界中心)，屹立着Parnassus

Mount(诗檀山)，山上有一座阿波罗神庙，庙中住着女祭司(Oracle)

Oracle 数据库存储结构健康检查 常见手段

• 11g以前Hcheck脚本检测数据字典完整性、一致性• 11g以后Health Monitor Checks ,DBMS_HM DBKH、KTUD

• Log Scanner 日志扫描• ASM Health Checker

• Etc

• hcmon - Health Check Monitor• dbping - DBping Monitor• logscan - Log Scanner Monitor• ParnassusData recovery manager\HM

• ORACLE 健康监控设计文档HM_INV.doc

• http://docs.oracle.com/cd/B28359_01/server.111/b28310/diag007.htm#ADMIN11273

Hcheck脚本

• 一个纯粹的SQL脚本

• 其输出如OPRHAN TAB$、TABPART$

• hcheck.sql 2013年3月最后一次更新

• 本质上是hcheck package

• 典型的查询如下：

11g Health Monitor Checks

• Dbkh DBK Health monitor main layer、 KTU

Diagnosability etc

– Checks for dictionary consistency

– Checks for data corruptions

– Checks for undo/redo corruptions

– Checks for memory corruptions and fragmentation issues

– Checks for RAC (global cache and global enqueues) issues

– Checks for Shared cursors (unusual growth of child

cursors)

11g Health Monitor Checks

• DB Structure Integrity Check

• Data Block Integrity Check

• Redo Integrity Check

• Transaction Integrity Check

• Undo Segment Integrity Check

• Dictionary Integrity Check

Asm health check

• kfhm.c - Kernel Files Health Monitor Checker functions

• Checkers in 11.2

• Allocation failure due to OutOfSpace errors

• Mount failure due to MissingDisks

• Add/Online disk failure due to ClusterwideVisibility

issues

• FileDrop fails

• Mount failure due to InsufficientDisks

• Mount failure due to TooManyOfflineDisks

字典检测

• prvtsqtk.sql - Package for building SQL Toolkit Checker Meta-data

• The Component for these checks will be DICTIONARY with a sub component of CORE_DICTIONARY

• Single row checks will be named <object_name>_single_row_check

• Cross Row checks will be named <object_name>_cross_row_check

• Relationship checks will be named <object_name>_relationship_check

字典检测

• Dictionary Integrity Check—This check examines the integrity of core dictionary objects, such as tab$ and col$. It performs the following operations:– Verifies the contents of dictionary entries for each dictionary

object.– Performs a cross-row level check, which verifies that logical

constraints on rows in the dictionary are enforced.– Performs an object relationship check, which verifies that parent-

child relationships between dictionary objects are enforced.

• The Dictionary Integrity Check operates on the following dictionary objects:

• tab$, clu$, fet$, uet$, seg$, undo$, ts$, file$, obj$, ind$,icol$, col$, user$, con$, cdef$, ccol$, bootstrap$, objauth$, ugroup$, tsq$, syn$, view$,typed_view$, superobj$, seq$,lob$, coltype$, subcoltype$, ntab$, refcon$, opqtype$, dependency$, access$, viewcon$, icoldep$, dual$, sysauth$,objpriv$, defrole$, and ecol$.

其他检测

• krbb0.h - Kernel Recovery Backup/restore Backup

private declarations Design Specification for

Transaction Layer Diagnosability 11gR1

• ktud.h - KTU Diagnosability undo

• kcidr.h - Kernal Cache Intelligent Data Repair

Header

• dbkstk.c - Database Kernel Sql ToolKit

我们要做的

• Dictionary 字典检测 -- 比较清晰

• ASM检测 --比较清晰

• Undo、Redo、transaction 技术上复杂，是否考虑做？

Thank You

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