Oracle 5.0 Reference Manual page 509

[488] exists only as a
read_only
[578] privilege. Changes to
SUPER
slave servers. The value can be set on a slave server independent of the setting on the master.
Important
In MySQL 5.0, enabling
PASSWORD
series. When replicating from one MySQL release series to another (for
example, from a MySQL 5.0 master to a MySQL 5.1 slave), you should check
the documentation for the versions running on both master and slave to
determine whether the behavior of
same, and, if it is different, whether this has an impact on your applications.
•
read_rnd_buffer_size
Command-Line Format
Option-File Format
Option Sets Variable
Variable Name
Variable Scope
Dynamic Variable
When reading rows in sorted order following a key-sorting operation, the rows are read through this
buffer to avoid disk seeks. See
large value can improve
client, so you should not set the global variable to a large value. Instead, change the session variable
only from within those clients that need to run large queries.
The maximum permissible setting for
read_buffer_size
engine and apply in a general manner for optimization. See
Memory", for example.
•
relay_log_purge
Command-Line Format
Option-File Format
Option Sets Variable
Variable Name
Variable Scope
Dynamic Variable
Server System Variables
variable, so changes to its value require the
GLOBAL
read_only
read_only
statement. This is not necessarily the case for all MySQL release
[489]
--read_rnd_buffer_size=#
read_rnd_buffer_size
Yes,
read_rnd_buffer_size
read_rnd_buffer_size
Global, Session
Yes
Permitted Values
Type
numeric
Default
262144
Range
8200 .. 4294967295
Section 8.3.1.11,
performance by a lot. However, this is a buffer allocated for each
ORDER BY
read_rnd_buffer_size
[488] and
read_rnd_buffer_size
[489]
--relay_log_purge
relay_log_purge
Yes,
relay_log_purge
relay_log_purge
Global
Yes
Permitted Values
Type
boolean
Default
TRUE
489
[488] on a master server are not replicated to
does not prevent the use of the
in this regard is or is not the
read_only
[489]
"ORDER BY Optimization". Setting the variable to a
[489]
[489] are not specific to any storage
Section 8.9.4, "How MySQL Uses
[489]
SET
is 2GB.