Space announcement

   

This space provides the same content as before, but the organization of the home page has changed. The content is now organized based on logical branches instead of legacy book titles. We hope that the new structure will help you quickly find the content that you need.

Examples of NGT Recover operations

This section describes and provides examples of some of the recovery scenarios that you can implement by using NGT Recover.

The recovery scenarios show the different NGT Recover execution phases. NGT Recover analyzes all requests in the SYSIN data set and then constructs a plan that consists of the execution phases needed to accomplish the work requested. The following table describes the major execution phases.

Phase

Description

LOG INPUT

The LOG INPUT phase reads the DB2 log records required for recovery and sends them to a sort task. If you specified MAXLOGS > 1, NGT Recover starts multiple subtasks to handle log file allocation. The main task processes log records. The subtasks handle allocation.

MERGE

The MERGE phase reads sorted log records and applies them to page images, from an image copy or, in the case of BACKOUT and LOGONLY, from the space itself. This phase recovers table spaces or indexes from logs, extracts keys and sends them to a sort, reads the space for BACKOUT or LOGONLY recovery, writes output image copy data sets, writes output change accumulation files, and performs many other tasks. Multiple MERGE phases can run in parallel (using the MAXLSORT option).

UNLOAD

The UNLOAD phase extracts the index keys from a table space or partition that is not being recovered (and has no MERGE phase) and sends those keys to a sort task. A MERGE phase and an UNLOAD phase should not occur for the same table space or table space partition.

BUILD

The BUILD phase constructs indexes by using sorted keys extracted in a MERGE or UNLOAD phase.

SNAP

The SNAP phase uses XBM or SUF to perform a data set snap to restore an Instant Snapshot copy.

This section contains the following topics:

Was this page helpful? Yes No Submitting... Thank you

Comments

  1. Stephen Wallace

    Why does the BMC site send me round in circles and why can I not down load the PDFs

    Jun 25, 2019 03:34
    1. Dottie Wood

      Hi, Stephen. Thanks for contacting us! We are sorry that you are having trouble locating the information that you need.

      Regarding PDFs, you can generate a custom PDF of any page or section in the space by using the Tools menu. For instructions, see PDFs and videos, which is also accessible from an expandable ribbon near the bottom of the space's home page. You can also download ready-made PDFs of the entire space from PDFs and videos.

      As for finding the content that you need, this short video provides search tips. Also, within a space, you can use the expandable navigation tree on the left and the search box above the navigation tree to look for topics. 

      If you need more assistance, please contact BMC Support by clicking hereYou can use the Select Another Country box to find contact information for your location.


      Jun 25, 2019 01:39