Troy Coleman

Troy L Coleman

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Recent Posts

  • The Future of Db2 Documentation: More PDFs, More Frequent Updates.
  • IBM Champions: Nomination Period Ends Soon
  • Planning for a Db2 for z/OS Upgrade: Application Testing
  • Contest Introduces Students to the Mainframe
  • Db2 12 Brings Enhanced Data Validation Capabilities to DSN1COPY
  • How Data Server Manager Fits with z/OS

    I’ve written a lot about Data Server Manager (DSM) since its release in October and the announcement of DB2 for z/OS support in January.

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    Posted: April 19, 2016 |

    DB2 11 Block Fetch Capabilities

    Last week I briefly went through the history of block fetch. Today I look at the block fetch enhancements delivered in DB2 11 for z/OS, known as package-based continuous block fetch, or blasting.

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    Posted: April 12, 2016 |

    The Evolution of DB2 Block Fetch

    When DB2 was first released, a distributed application would open a cursor and fetch a single row of data. This fetch request would go to DB2, then DB2 would return one row to the application. If the application requested 20 rows to be displayed on the screen, then 20 cross-network requests had to be made. This would greatly reduce the response time for the given application.

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    Posted: April 05, 2016 |

    Big News About DB2 11 for z/OS Certification

    IBM just made available a new DB2 for z/OS certification test, DB2 11 Fundamentals for z/OS (C2090-320). To put it mildly, this is great news.

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    Posted: March 29, 2016 |

    Access Database Command Improvements

    DB2 11 brings a number of enhancements to the ACCESS DATABASE command. Before getting into those improvements, I want to discuss how the ACCESS DATABASE command is used.

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    Posted: March 22, 2016 |


    At times a transaction executing on DB2 for z/OS could cause resource problems with other transactions. It could be driving up CPU usage, holding locks and blocking critical transactions, or causing a number of other issues.

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    Posted: March 15, 2016 |

    DB2 11 Autonomous Procedures

    DB2 11 introduced autonomous procedures, which are native SQL procedures that commit independently from the calling application. They execute under their own units of work, separate from the calling program.

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    Posted: March 08, 2016 |

    RESTful Software Installation on z/OS

    Traditionally, the mainframe hasn't been viewed as a platform for modern software development. Of course the reality is that IBM z Systems has embraced an array of new technologies over the past several years, while at the same time strengthening its already-world class availability and security capabilities.

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    Posted: March 01, 2016 |

    The Ever-Diminishing Need for REORGs

    In December 2014 I wrote a post titled, “Are Reorgs Still Necessary?” In it I discussed how IBM Easy Tier storage technology may eliminate the need to run REORGs. This week I want to revisit this question, framing the discussion with information from an IBM Redpaper I initially reviewed in August 2014.

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    Posted: February 23, 2016 |

    The Page Residency Time Metric

    During my years as a DB2 systems programmer, I spent time tuning buffer pools. A key metric I'd use is buffer pool hit ratio, which is a measure of how often a page access (a getpage) is satisfied without requiring an I/O operation. However, it's been a long time since I've worked on buffer pools, something I was reminded of when I read IBMer John Campbell's presentation on page residency time.

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    Posted: February 16, 2016 |

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