Oracle 5.0 Reference Manual page 1259

Option-File Format
Option Sets Variable
Variable Name
Variable Scope
Dynamic Variable
can use checksum validation on all pages read from the disk to ensure extra fault tolerance
InnoDB
against broken hardware or data files. This validation is enabled by default. However, under some
rare circumstances (such as when running benchmarks) this extra safety feature is unneeded and
can be disabled with --skip-innodb_checksums. This variable was added in MySQL 5.0.3.
•
innodb_commit_concurrency
Version Introduced
Command-Line Format
Option-File Format
Option Sets Variable
Variable Name
Variable Scope
Dynamic Variable
The number of threads that can commit at the same time. A value of 0 (the default) permits any
number of transactions to commit simultaneously. This variable was added in MySQL 5.0.12.
•
innodb_concurrency_tickets
Version Introduced
Command-Line Format
Option-File Format
Option Sets Variable
Variable Name
Variable Scope
Dynamic Variable
The number of threads that can enter
innodb_thread_concurrency
to enter if the number of threads has already reached the concurrency limit. When a
InnoDB
thread is permitted to enter InnoDB, it is given a number of "free tickets" equal to the value of
innodb_concurrency_tickets
has used up its tickets. After that point, the thread again becomes subject to the concurrency check
(and possible queuing) the next time it tries to enter InnoDB. The default value is 500. This variable
was added in MySQL 5.0.3.
Startup Options and System Variables
InnoDB
innodb_checksums
Yes,
innodb_checksums
innodb_checksums
Global
No
Permitted Values
Type
boolean
Default
ON
5.0.12
--innodb_commit_concurrency=#
innodb_commit_concurrency
Yes,
innodb_commit_concurrency
innodb_commit_concurrency
Global
Yes
Permitted Values
Type
numeric
Default
0
Range
0 .. 1000
5.0.3
--innodb_concurrency_tickets=#
innodb_concurrency_tickets
Yes,
innodb_concurrency_tickets
innodb_concurrency_tickets
Global
Yes
InnoDB
[1251] variable. A thread is placed in a queue when it tries
[1239], and the thread can enter and leave
1239
[1238]
[1239]
concurrently is determined by the
[1239]
freely until it
InnoDB