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A shared memory performance enhancement has been enabled for all Unix platforms, starting with the base c-treeACE V11.6 line. The following changes have now been well proven in production use since late fall of 2017.
The Unix/Linux shared memory communication protocol has been changed to improve performance by improving the internal spin operation to be more efficient, especially for relatively short database operations.
Compatibility Note: It is important to recompile the client due to this shared memory change. A server that uses this modified shared memory protocol only supports shared memory connections from clients that also use this new enhanced protocol. If an older client (pre-V11.6) attempts to connect, it will fail with error SHMC_ERR (841) and the server will log the following message to CTSTATUS.FCS:
Fri May 26 12:13:07 2017
- User# 00016 FSHAREMM: The client's shared memory version (3) is not compatible with the server's shared memory version (4)
