Oracle 5.0 Reference Manual page 1591

Diskless
Effective Version
MySQL 5.0.0
Restart Type: IS
It is possible to specify MySQL Cluster tables as diskless, meaning that tables are not checkpointed
to disk and that no logging occurs. Such tables exist only in main memory. A consequence of using
diskless tables is that neither the tables nor the records in those tables survive a crash. However,
when operating in diskless mode, it is possible to run
Important
This feature causes the entire cluster to operate in diskless mode.
When this feature is enabled, Cluster online backup is disabled. In addition, a partial start of the
cluster is not possible.
is disabled by default.
Diskless
•
RestartOnErrorInsert
Effective Version
MySQL 5.0.0
Restart Type: N
This feature is accessible only when building the debug version where it is possible to insert errors in
the execution of individual blocks of code as part of testing.
This feature is disabled by default.
Controlling Timeouts, Intervals, and Disk Paging
There are a number of
in Cluster data nodes. Most of the timeout values are specified in milliseconds. Any exceptions to this
are mentioned where applicable.
•
TimeBetweenWatchDogCheck
Effective Version
MySQL 5.0.0
Restart Type: N
To prevent the main thread from getting stuck in an endless loop at some point, a "watchdog" thread
checks the main thread. This parameter specifies the number of milliseconds between checks. If the
process remains in the same state after three checks, the watchdog thread terminates it.
This parameter can easily be changed for purposes of experimentation or to adapt to local
conditions. It can be specified on a per-node basis although there seems to be little reason for doing
so.
The default timeout is 4000 milliseconds (4 seconds).
•
StartPartialTimeout
MySQL Cluster Configuration Files
Type/Units
true|false (1|0)
Type/Units
error code
parameters specifying timeouts and intervals between various actions
[ndbd]
Type/Units
milliseconds
1571
Default
false
on a diskless computer.
ndbd
Default
2
Default
6000
Range/Values
true, false
Range/Values
0 - 4
Range/Values
70 - 4G