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MySQL 5.6 Reference Manual
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Excerpts from this Manual Configuring MySQL Cluster to use SCI Sockets

It is possible employing Scalable Coherent Interface (SCI) technology to achieve a significant increase in connection speeds and throughput between MySQL Cluster data and SQL nodes. To use SCI, it is necessary to obtain and install Dolphin SCI network cards and to use the drivers and other software supplied by Dolphin. You can get information on obtaining these, from Dolphin Interconnect Solutions. SCI SuperSocket or SCI Transporter support is available for 32-bit and 64-bit Linux, Solaris, Windows, and other platforms. See the Dolphin documentation referenced later in this section for more detailed information regarding platforms supported for SCI.

Once you have acquired the required Dolphin hardware and software, you can obtain detailed information on how to adapt a MySQL Cluster configured for normal TCP/IP communication to use SCI from the from the Dolphin SCI online documentation.

User Comments
  Posted by Arlo Gilbert on June 28, 2011
To save anybody else the headache, this does not work. The SCI Transport code is missing lots of needed declarations and looks like it hasn't been touched in years.

In English, you can not compile MySQL with the --ndb-sci flag.

The recommended solution from Dolphin is to preload the library in the init.d script for mysqld which achieves the same goal as the compile flags.
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