Oracle 5.0 Reference Manual page 494

Option Sets Variable
Variable Name
Variable Scope
Dynamic Variable
The default pointer size in bytes, to be used by
option is specified. This variable cannot be less than 2 or larger than 7. The default value
MAX_ROWS
is 6 (4 before MySQL 5.0.6). See
•
myisam_max_extra_sort_file_size
This variable is unused as of MySQL 5.0.6.
•
myisam_max_sort_file_size
Command-Line Format
Option-File Format
Option Sets Variable
Variable Name
Variable Scope
Dynamic Variable
The maximum size of the temporary file that MySQL is permitted to use while re-creating a
index (during
REPAIR
larger than this value, the index is created using the key cache instead, which is slower. The value is
given in bytes.
The default value is 2GB. If
increasing the value may help performance. The space must be available in the file system
containing the directory where the original index file is located.
•
myisam_mmap_size
Server System Variables
Yes,
myisam_data_pointer_size
myisam_data_pointer_size
Global
Yes
Permitted Values (<= 5.0.5)
Type
numeric
Default
4
Range
2 .. 8
Permitted Values (>= 5.0.6)
Type
numeric
Default
6
Range
2 .. 7
Section C.5.2.12,
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[474]
--myisam_max_sort_file_size=#
myisam_max_sort_file_size
Yes,
myisam_max_sort_file_size
myisam_max_sort_file_size
Global
Yes
Permitted Values
Platform
32
Bit Size
Type
numeric
Default
2147483648
Permitted Values
Platform
64
Bit Size
Type
numeric
Default
9223372036854775807
TABLE, or
TABLE, ALTER
index files exceed this size and disk space is available,
MyISAM
[474]
474
[473]
for
CREATE TABLE MyISAM
"The table is
(DEPRECATED)
[474]
INFILE). If the file size would be
LOAD DATA
tables when no
full".
MyISAM