Troy Coleman

Troy L Coleman

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Recent Posts

  • A Happy 10 Years
  • Db2: A Small but Significant Change
  • Subsystem Parameter Changes in DB2 12
  • New and Changed Subsystem Parameters in DB2 11
  • MERGE Statement Enhancements in DB2 12
  • A Welcome Alternative to Object Ownership Change

    Most DBAs dread changing the ownership of an object. You have to take the database offline, sometimes for an extensive period, to unload, drop, recreate and reload the data, run runstats and--finally--rebind all the application packages. I’m sure many of you have at least a horror story or two about this experience.

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    Posted: May 02, 2017 |

    DB2 12 Catalog Availability Improvements

    During the early releases of DB2, enterprises (specifically DBAs) would restrict dynamic SQL from running in their production OLTP environments. This choice stemmed primarily from the likelihood of ad hoc OLAP queries adversely impacting the performance of OLTP applications. Of course, over the next 20-plus years, this issue has been largely mitigated by the widespread adoption of dynamic SQL. Dynamic SQL continues to be a focus of DB2 development, and DB2 12 features an important enhancement in the area of catalog availability.

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    Posted: April 25, 2017 |

    Improved EDM Pool Management in DB2 12

    Environmental descriptor manager (EDM) pools  contain skeleton application plans and packages, database descriptors, and cached dynamic SQL statements.

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    Posted: April 18, 2017 |

    Machine Learning Applications

    The recent announcement of IBM Machine Learning on z/OS is significant for a couple of reasons. First, it's another example of IBM's ongoing investment to the mainframe. Beyond that, it's important for anyone who supports software installation, database administration and analytics on z/OS.

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    Posted: April 11, 2017 |

    Adding a Partition Between Logical Partitions

    Designing and sizing table space requires DBAs to  make numerous determinations. How many rows per day will be inserted/updated/deleted? How will the data be processed? What is the criteria to determine active versus historical data? How long will the data (active and historical) need to be stored before it will be deleted?

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    Posted: April 04, 2017 |

    DB2 12 Pending Column Alterations

    Prior to DB2 12 function level V12R1M500, altering column attributes such as data type, precision, scale or length would occur instantly.

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    Posted: March 28, 2017 |

    Using Installation SYSOPR Authority

    These days, most enterprises limit access to sensitive data to only those users who need to see this information to do their jobs. In the meantime, security features have evolved over the past few DB2 releases.

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    Posted: March 21, 2017 |

    Converting DBRMs to Packages in DB2 12

    Prior to DB2 12, the DB2 bind command allowed you to specify either a list of database request modules (DBRM) using the member keyword or a list of packages using the PKLIST (package list) keyword. However, IBM, which deprecated the member keyword option in DB2 10, has removed it entirely from DB2 12. So any migration to DB2 12 should include taking the steps needed to rebind all plans without the member keyword.

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    Posted: March 14, 2017 |

    DB2 12 Enhancements to System Profiles

    DB2 11 introduced a powerful feature that provides monitoring capabilities using DB2 profile tables. With these tables, you can monitor the use of system resources by distributed applications as well as set special registers values for the remote application without having to change application code.

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    Posted: March 07, 2017 |

    DB2 12 Active Logs Greater than 4 GB

    Recently while presenting a DB2 12 technical workshop, I discussed pre-migration requirements. One important consideration is the need to ensure that the current DB2 11 active logs are not greater than 4 GB. When the active logs are greater than 4 GB, DB2 11 will startup without a problem and ignore the portion of the log greater than 4GB; however, DB2 12 will not start when in V12R1M100 function mode.

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    Posted: February 28, 2017 |

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