© 2006 IBM Corporation

Maintaining High Database Performance

IMS DB Recovery Solution

The IBM IMS Tools Solution

Margaret M WilsonIMS Tools Market Manager

wilsonmm@us.ibm.com

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Highlights

We understand your company’s needs…and we’re here to help

The product families we offer

– Systems Administration

– Recovery

– Reorganization

– Performance and Tuning

– Fast Path Solutions

– Data Administration

Summary

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Solutions that fit your needs

IBM IMS Tools

Systems Administration

Recovery

Reorganization

Data Administration

Fast Path Solutions

Performance and Tuning

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Recovery Solutions

IMS High Performance Image Copy

IMS High Performance Change Accumulation Utility

IMS Database Recovery Facility

IMS Index Builder

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A reliable recovery plan is critical to your business

Your mainframe databases represent a huge investment by your company.

If your data is unavailable for any reason, you are not receiving the expected gain on your investment.

When this occurs, IT becomes a cost burden instead of a business asset.

An e-business must be available and operational 24 hours a day, 365 days a year.

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Some database outages are planned…

Application database maintenance

Data migration

Database design change implementation

Hardware maintenance or upgrades

Disaster recovery preparation and testing

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But the highest impact outages are not… Application errors

Improper data feeds

User errors

Operations errors

Batch cycle errors

Fallback from application change migrations

Site disasters (floods, power outages, storms, fires and so on)

Hardware failures

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IBM IMS Tools can help

When these situations occur, a recovery solution that is complicated and time consuming to prepare and execute will result in increased down time and loss of revenue.

Software based recovery tools are not a luxury or an insurance policy — they are a key component of mission

critical database support.

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The challenges with using IMS base utilities for recovery

IMS recovery is a very complex task, quite prone to errors and generally difficult to manage.

Utilities use serial processing adding to the time your data is unavailable.

Less automation means more manual labor and more potential for error.

All the while your databases are offline and unavailable for your critical business needs.

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A hardware solution isn’t enough Hardware solutions are not complete.

Hardware only covers what was mirrored.

It’s too expensive to send all of your business critical databases offsite.

Even with a hardware solution, recovery tasks are still needed to get back up and running.

What about application program errors?

Having multiple copies of logically incorrect data is not a solution.

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The IBM IMS Tools Recovery Solution

The IBM IMS Tools Recovery Solution is an effective and efficient way to ensure your IMS data is recovered quickly and accurately.

These four tools combine to form an integrated and automated solution to meet your recovery needs

– IMS High Performance Image Copy

– IMS High Performance Change Accumulation Utility

– IMS Database Recovery Facility

– IMS Index Builder

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IMS High Performance Image Copy v4.1 5655-N45

Creates exact (image) copies of IMS databases

Functions:– Run an Image Copy function with the hash checking of IMS HP Pointer

Checker V2 under the control of IMS Parallel Reorganization, V3• Major reduction in run-time of the reorganization process • Supports processes in parallel within an IMS Parallel Reorganization

– New optional parameter for controlling the secondary image copy data set – Performs accuracy checking of an image copy– Dynamic Allocation for all input and output datasets– Reports DBRC information about the registered Image Copy data sets

Your Value:– Reduces operational costs by using less tape storage– Minimizes manual steps involved with tape usage– Automated functions help data centers run more efficiently

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IMS High Performance Image Copy v4.1 5655-N45 Advanced copy services

– Concurrent copy,

– FlashCopy and

– SnapShot copy.

Reduces image copy and recovery time, reduces elapsed time and CPU utilization.

– Minimizes CPU utilization and elapsed time by using High Performance (HP) Input/Output function for read and write processing

Provides automatic checkpoint and restart. – Restart failed image copy jobs by resubmitting the same job stream.

– No alterations to the job stream are necessary, which avoids duplicating previously successful image copies.

Stops and starts database automatically.

– IMS Tools Online System Interface

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IMS HP Change Accumulation v1.3 5655-F59 Runs multiple change accumulation groups in parallel and streams output

across all addresses simultaneously

Functions:– Provides both ISPF interfaces that allow for customization, setup and execution and

Batch interfaces for operations– Elimination of separately scheduled Fast Path sort address space– DBRC is now optional– Processes input data (from RLDS's) and output data (new CA's) in parallel

• Users can control the number of parallel processes – Improved reporting

• Consolidates the status of associated address spaces into a single report, and extends diagnostic capabilities with new error reporting messages

Your Value:– Increased database availability– Increased IMS database data integrity

Control SpaceControl Space

Main TCB

LogReader

TCB

IMSLog

IMSLog

LogReader

TCB

SORT SpacesSORT Spaces

Main HPCA TCB

SORTProduct

TCB

E15 E35

NewCA

OldCA

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IMS Index Builder v2.3 5655-E24

Helps streamline index maintenance and recovery

Functions:

– Add or Rebuild all or some secondary indexes of an IMS full-function database (including HALDB)

– Build both primary and secondary indexes in one job step, eliminating the need to image copy indexes

– Rebuild HIDAM or PHIDAM partition primary index

– DBRC notification support

– Provides an ISPF front end for easy JCL generation

– Creates separate sort address spaces

– Duplicate Record Processing to Spill File

Your Value:

– Improves overall performance

– Improves DBA productivity by its’ enhanced ease of use

– Saves time by performing index recovery without full database reorganization by using DL/I to scan the databases

More information

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IMS Database Recovery Facility v3.1 5655-N47 High Performance IMS Database Recovery Solution - Recovers IMS

database data sets and Fast Path areas Functions:

– Recovery of Multiple DBDS or Areas in one step

• Runs in Parallel with IMS Transaction Processing• Online or Batch mode recovery

– Supports all Recoverable IMS Database Types

• Not GSAM, HSAM, SHSAM, or MSDB types– Full formatted recovery report

– Report only execution (VERIFY option)

Your Value:

– Increased database availability:

• Applying database changes to multiple database data sets simultaneously with a single pass of input data

• Reducing recovery time

– Enhanced usability and flexibility by supporting report-only execution

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IMS Database Recovery Facility v3.1 5655-I44

Increased Tools Integration

– Automatic invocation of High Performance tooling, including Image Copy, Pointer Checker, Fastpath Pointer Checker, Index Builder, and DFSPREC0.

Database Copy Generation

– Creation of copies of database data sets without accessing production copies

– Input is image copy, change accumulation, and log data sets

– Copies can be created to any point in time via PITR

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IMS Database Recovery Facility v3.1 5655-I44

Automatic Delete/Define of Database Data Sets

– Output data sets are created as part of the recovery process

Incremental Image Copy

– Created via HPIC

Allocate/Open Option on START VERIFY

– Logical and physical validation of data set availability prior to running the actual recovery job

Submitting IMS Commands via TOI/XCF

– DBR local or global

– START local or global

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IMS DRF v3.1 5655-I44 – Recovery Flow

Use dynamic allocation of data sets– database, log, change accumulation, and image copy

Does NOT use IMS resources for recovery

Gets all information about recovery datasets from RECONs– The Catalog is used if the RECON has not recorded data set migration

Read Log data sets in parallel– From RLDS or SLDS only– Single Log Pass for Multiple DBDS Recovery

Read Change Accumulation datasets concurrently with Log data sets– Complete or Incomplete (with Spill records)– Change Accum is not required, including in a data sharing environment

Sort Log Records

Update Image Copy data with log and change accum data in a single pass– Standard IC - Changes applied as data is read– IC2 - Data is restored - Only updated records are read

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The IBM IMS Tools Recovery Solution

Start OptionsIMSIMS

JCLJCL

DRFDRF

Recon

Master AS

Subordinate ASControl Function

DBRC

Log and CA read

Log

IC DBDS

AreaData Set Restore

SortSub ASSub AS

Data Set Restore

Sort

Report

IB/DFSPREC0 AS

IB or DFSPREC0

HPPC, DEDB PC HPIC

IC

Recovery Flow

Build primary and secondary index data sets during the recovery process

Rebuild post recovery phase

HALDB Primary Index and Index List Data Set rebuild

Rebuild post recovery phase

Hash check pointer validation run as part of recovery processing

Block by block pointer check, not post processed

Produce image copies as part of recovery processing

Image copies are registered with DBRC

Block by block image copies

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Typical recovery scenarios

Application Error

Producing An Audit Copy

Disaster Recovery

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Application Error

Point-In-Time Recovery

– Need to determine what application and when

– Use IMS Tools Recovery Solution to recover the effected databases

• Recover all databases in parallel• Read multiple logs in one pass• Recover only committed data to the time specified• Recovery happens without backout

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Time

Committed data

Non committed data

Run away application submits update twice

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Producing An Audit Copy

Creating an audit (or test) copy of your databases using the IMS Tools Recovery Solution

– Produce copies without accessing production databases

– Build copies from image copy, change accumulation, and log data sets

– Generate data set names• Prefix or suffix• Date, time• High level qualifier• Literal

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DRF

IMS Production

Database

CA, Log, IC

Database Copy

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Disaster Recovery

Moving your data from a remote site to your production site in case of a disaster

– Option 1

• Send a copy of your image copies and logs offsite• Then ship them back to your production site when needed• The IMS Tools Recovery Solution will use them as input to

rebuild your databases

– Option 2

• Perform change accumulation using HPCA• Use this as input to make an incremental image copy using

DRF and ship offsite• When shipped back to your production site, DRF recovers

to an image copy

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Summary

The IMS Tools Recovery solution combines the power of four high performance tools from IBM to help you quickly and efficiently recover your IMS data…

Supports a variety of image copy formats as input including concurrent copy, FlashCopy and SnapShot copy and leverages High Performance Input/Output functions.

Quickly and efficiently reads multiple logs in parallel, processes that data, and sends it to multiple address spaces for multiple CA groups.

The cornerstone of the IMS Tools Recovery Solution, integrating the power of Image Copy, Change Accumulation, and Index Builder tooling under one interface.

Eliminates the need for recoverable indexes, which eliminates the need to image copy indexes and reduces IMS log volume.