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c-treeACE V11.0 Update Guide

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Relaxed COMPATIBILITY FORCE_WRITETHRU Defaults

COMPATIBILITY FORCE_WRITETHRU enables the WRITETHRU filemode for all non-transaction files (which includes PREIMG files). The performance impact of WRITETHRU depends on whether COMPATIBILITY PREV610A_FLUSH is also enabled. See the descriptions in COMPATIBILITY FORCE_WRITETHRU and COMPATIBILITY PREV610A_FLUSH.

These options provide a good balance between update performance and recoverability of data in the event of an abnormal FairCom Server termination. They affect non-transaction files as follows:

  • Non-transaction files that are neither created nor opened with the WRITETHRU filemode have their updates written to the FairCom Server cache and eventually written to the file system cache and to disk.
  • Non-transaction files that are created or opened with the WRITETHRU filemode have their updates flushed to the file system cache.

Be sure to understand the impact of these file modes with respect to your file transaction mode in use, and type and vulnerability of your application data.

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