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Homebulletgrey.gifTechnical Newsbulletgrey.gifPrevent Data Corruption from Concurrent FPUTFGET Updates

Prevent FPUTFGET Data Corruption with Concurrent Updates

20 January 2010

Affected Builds: All builds between 050722 through 100120
Criteria: Concurrent FPUTFGET record add/updates to variable length files.
Indications: Unexpected ITIM_ERROR (160) errors

In c-tree multi-user standalone (FPUTFGET) mode, when a process updates a record, increasing the size of the record, while at the same time another process adds a record, and if there is deleted space available after the record that is being updated, the update logic could reuse that space even though the add operation has already used the space for the newly-added record.

This issue only affects the c-tree multiuser standalone mode (FPUTFGET) and does not affect the c-tree Server.

A code change applied in July 2005 modified previously correct behavior. As a result, the logic in RWTVREC() that reads the key from the space management index after locking the space that is a candidate for reuse skips the call to read the key from the space management index. This omission can cause the update to enlarge the record into space that has been reused by a record add operation. The ITIM_ERR (160) was observed in that an index key entry pointed to an offset in the data file that was within another record. That record had been enlarged by an update operation, and it overwrote a record that was added at the same time the record was updated. A simple rearrangement of code prevents this behavior.

FairCom customers on current maintenance can request an updated V9 c-treeACE line at any time. Please contact your nearest FairCom office should you have any concerns that you are impacted by this update.

Computer Associates International, Inc (NYSE: CA) has been developing and supporting software solutions for more than 99% of the Fortune 500® in more than 100 countries for over a quarter century. CA's world-class solutions address all aspects of eBusiness process management, information management, and infrastructure management in six focus areas: enterprise management, security, storage, portal and business intelligence, database management, application life cycle management, and application development. As the world's third largest enterprise software company, CA provides industry-leading integrated solutions through strategic partnerships and powerful brands such as Unicenter®, BrightStor™, eTrust™, CleverPath™, Advantage™, Jasmine® and AllFusion™. With mission-critical software in security and storage, CA provides reliable, quality technology. CA works hard to achieve the highest quality in their solutions to help their customers meet changing business needs. That's why CA became the first and only global enterprise software company to meet the exacting standards for worldwide ISO 9002 certification.

Advantage™ CA-Realia® II Workbench™ provides a mainframe-compatible COBOL development environment on the PC. It uses the power of the PC environment to improve the development and maintenance of COBOL and CICS applications. FairCom's c-tree Plus provides the underlying technology for the runtime file system of Advantage CA-Realia II Workbench. Computer Associates selected FairCom technology for this application because of the strength and flexibility of c-tree Plus and the flexibility of FairCom's business models.

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