LOBs with DB2 for z/OS: Stronger and Faster Paolo Bruni Patric Becker Tim Bohlsen Burkhard Diekmann Dima Etkin Davy Goethals Define LOBs, see how they work, and see how to store them Manage LOBs in operational environments Use LOBs in your applications and with SAP solutions, Major enhancements for LOB manipulation have been introduced with DB2 UDB for z/OS Version 8 and DB2 Version 9.1 for z/OS (DB2 9 in this book). These enhancements include performance functions such as the avoidance of LOB locks and DRDA LOB flow optimization, usability functions such as file reference variables, FETCH CONTINUE, and the automatic creation of objects.
11/14/2007 · LOBs with DB2 for z/OS: Stronger and Faster. IBM Redbooks. The requirements for a database management system (DBMS) have included support for very large and complex data objects. DB2 UDB for OS/390 Version 6 introduced the support for large objects (LOBs): they can contain text documents, images, or movies, and can be stored directly in the DBMS …
11/29/2006 · Lobs With DB2 for Z/Os: Stronger and Faster [IBM Redbooks] on Amazon.com. *FREE* shipping on qualifying offers.
1/19/2012 · Another LOB space consumption control capability is LOB inlining, introduced (as I pointed out in the opening paragraph of this entry) with DB2 10 for z/OS . The significance of that and other LOB -related features of DB2 10 is such that they deserve coverage in a separate blog entry. I’ll try to get that entry posted within the next couple of weeks.
Large object ( LOB ) table spaces (also known as auxiliary table spaces) hold large object data, such as graphics, video, or large text strings. If your data does not fit entirely within a data page, you can define one or more columns as LOB columns. LOB objects can do more than store large object data.
There are several nice IBM redbooks that tackle the topic of using and coding for Binary Large Objects with DB2 for z/OS . The first book is titled Large Objects with DB2 for z/OS and OS /390 (SG24-6571). Chapter 4 of this redbook is called Using LOBs and it will probably contain a lot of what you are looking for in terms of descriptions, examples and as some sample code.
Db2 uses prefetch I/O to read data in almost all cases, but uses synchronous I/O in certain cases.. When synchronous read is used, just one page is retrieved at a time. The unit of transfer for a synchronous read is one page per single I/O operation. Db2 uses prefetch mechanisms such as dynamic prefetch, sequential prefetch, and list prefetch, whenever possible, to avoid costly wait times from …
LOBs : Stronger and Faster in DB2 9 for z/OS (Part 1 of 2) (C05) Details: Patric Becker: LOBs : Stronger and Faster in DB2 9 for z/OS (Part 1 of 2) (C05) Details: Patrick Bossman: Query Tuning with Optimization Service Center (F08) Details: Patrick Bossman: Getting More Out of Visual Explain V8 (F03), 1/31/2012 · In my previous entry, I provided information pertaining to the amount of data that can be stored in a LOB column of a mainframe DB2 table ( LOBs being DB2 data values that can exceed 32 KB in length).I made brief references in that entry to significant enhancements in LOB data management capabilities delivered via DB2 10 for z/OS . I’ll describe those enhancements — the most significant …
