Oracle 5.0 Reference Manual page 1609

Effective Version
MySQL 5.0.0
Restart Type: N
Each SHM connection has a shared memory segment where messages between nodes are placed
by the sender and read by the reader. The size of this segment is defined by ShmSize. The default
value is 1MB.
•
SendSignalId
Effective Version
MySQL 5.0.0
Restart Type: N
To retrace the path of a distributed message, it is necessary to provide each message with a unique
identifier. Setting this parameter to
as well. This feature is disabled by default in production builds, and enabled in
•
Checksum
Effective Version
MySQL 5.0.0
Restart Type: N
This parameter is a boolean (Y/N) parameter which is disabled by default. When it is enabled,
checksums for all messages are calculated before being placed in the send buffer.
This feature prevents messages from being corrupted while waiting in the send buffer. It also serves
as a check against data being corrupted during transport.
•
SigNum
Effective Version
MySQL 5.0.0
Restart Type: N
When using the shared memory transporter, a process sends an operating system signal to the other
process when there is new data available in the shared memory. Should that signal conflict with with
an existing signal, this parameter can be used to change it. This is a possibility when using SHM due
to the fact that different operating systems use different signal numbers.
The default value of
using the shared memory transporter. Typically, this parameter is set to 10 in the
section of the
17.3.2.10. SCI Transport Connections in MySQL Cluster
sections in the
[sci]
between cluster nodes. Using SCI transporters in MySQL Cluster is supported only when the MySQL
binaries are built using --with-ndb-sci=/your/path/to/SCI. The
directory that contains at a minimum
header files. (See
information about SCI.)
In addition, SCI requires specialized hardware.
MySQL Cluster Configuration Files
Type/Units
bytes
Type/Units
boolean
Y
Type/Units
boolean
Type/Units
unsigned
is 0; therefore, it must be set to avoid errors in the cluster log when
SigNum
file.
config.ini
file explicitly define SCI (Scalable Coherent Interface) connections
config.ini
lib
Section 17.3.5, "Using High-Speed Interconnects with MySQL Cluster"
Default
1M
Default
false
causes these message IDs to be transported over the network
Default
true
Default
[none]
and directories containing SISCI libraries and
include
1589
Range/Values
64K - 4G
Range/Values
true, false
builds.
-debug
Range/Values
true, false
Range/Values
0 - 4G
[shm default]
should point to a
path
for more