Db2 for z/OS: System & Data Recovery Training in Ireland

A good knowledge of TSO/ISPF, SQL and general Db2 principles, structure and components.

• list all of the major system, backup and recovery components
• describe the need for Db2 logging to assist in recovery situations
• describe the need for and use of all Db2 utilities
• use the Db2 utilities and service aids specific to problem determination and recovery situations
• identify when service aids may be required for use in recovery situations
• describe the additional considerations when backing up and recovering catalog and directory tablespaces
• describe the actions taken during normal start-up, operation, and shut-down of the Db2 system
• describe the additional actions necessary following an abnormal termination of the Db2 system
• explain why and how a deferred restart may be performed and understand the effect it will have on the Db2 system and data
• explain why and how a conditional restart may be performed and the effect it will have on the Db2 system and data
• understand the options available for a conditional restart and when each may be required
• analyse any outstanding work following a deferred or conditional restart, and take the actions required to complete it
• describe the structure and format of Db2 pagesets
• analyse and repair broken Db2 pages
• interpret common error messages, and decide upon the actions required
• understand and implement Db2 system and data recovery and restart procedures.

Db2 Overview

Db2 architecture overview; working storage areas; storage pools; buffer pools; Db2 attachments; logging & recovery datasets; system databases; Db2 data objects; object characteristics; SQL overview; Db2 Interactive (Db2i).

Db2 Logging

Db2 logging; active and archive logs; boot-strap data set (BSDS); unit of recovery; two phase commit protocol; logging parameters; size & number of logs; checkpoints; checkpoint records; controlling logging using commands.

Introduction to Db2 Utilities

Online and stand-alone Db2 utilities; invoking online utilities using Db2i; utility control statements; using LISTDEF & TEMPLATE; use of wild Cards with LISTDEF; TEMPLATE options.

Utilities for Backup & Recovery

Backup & recovery components; use of SYSIBM.SYSCOPY; use of SYSIBM.SYSLGRNX; the COPY utility; using LISTDEF and TEMPLATE; COPYTOCOPY utility; MERGECOPY utility; QUIESCE utility; RECOVER utility; RECOVER using LISTDEF; recovery involving referential integrity, large object (LOB) and XML data: identifying consistent recovery points; point in time recovery; p-i-t recovery implications for RI, LOB and XML data; resetting status codes; REBUILD INDEX utility; REPORT utility; MODIFY utility; BACKUP SYSTEM utility; RESTORE SYSTEM utility; Restoring to a specified point; RECOVER using system-level backups.

Utilities for Data Integrity

CHECK DATA utility; CHECK DATA - SCOPE; CHECK DATA - SHRLEVEL; CHECK INDEX utility; CHECK LOB utility; REPAIR utility.

Other Online Utilities

LOAD utility; REORG TABLESPACE utility; Using shadow copies during REORG; Removal of BUILD2 phase; Shadow copies - FASTSWITCH; RUNSTATS utility; STOSPACE utility; UNLOAD utility.

Stand-Alone Utilities (service aids)

Invoking stand-alone utilities; DSN1COPY utility; DSN1PRNT utility; DSNJU004 (print log map) utility; DSNJU003 (change log inventory) utility; DSN1LOGP utility; DSN1CHKR utility; DSN1COMP utility; DSNJLOGF utility; DSNJCNVB utility.

Catalog & Directory Recovery

Catalog / Directory recovery implications; recovery sequence; Catalog & Directory point-in-time recovery; recovery implications; system-wide points of consistency.

Db2 System and Operations

Db2 commands; Starting Db2; Phase 1: log initialisation; Phase 2: current status rebuild; Phase 3: forward log recovery; Phase 4: backward log recovery; Start-up messages; Processing log records; Controlling Lock Manager (IRLM); Controlling Distributed Data Facility; Controlling CICS attachment; Other CICS Attachment commands; Controlling IMS Attachment; Other IMS Attachment commands; Controlling Threads; Controlling databases; Controlling buffer pools; Other Db2 commands; Stopping Db2.

Abnormal Termination & Restart

Db2 error messages & reason codes; data integrity considerations; log initialisation/current status rebuild/forward & backward log recovery implications; in-doubt threads and resolution; processing redo/undo records; deferred restart and its implications; delaying backout of long running tasks; conditional restart; creating a conditional restart control record, log truncation, limit restart, bypass backout, cold start, conditional restart implications; DSN1LOGP; cleaning up.

Db2 Physical Data Storage

VSAM file requirements; creating VSAM files; page sets; page set structure; index structure; index keys & pointers; data navigation; RIDS, pointers, and holes; table row header format; large object (LOB) data; large object columns; XML data; XML storage structure names; page set status; page set restrictions; analysing and fixing broken pages.

Problem Analysis and Handling

Basic code structure; Db2 messages and codes; Db2 subcomponents; Db2 control blocks; problem identification and resolution; basic dump analysis; identifying SQL statement; diagnosis traces and utilities; potential problem areas; active log out of space; active log I/O errors; archive log I/O errors; BSDS errors; forced single BSDS mode; recovering BSDS; data errors; down level datasets.