Oracle 5.0 Reference Manual page 1260

•
innodb_data_file_path
Command-Line Format
Option-File Format
Variable Name
Variable Scope
Dynamic Variable
The paths to individual data files and their sizes. The full directory path to each data file is formed
by concatenating
innodb_data_home_dir
specified in KB, MB, or GB (1024MB) by appending K, M, or
of the files must be at least 10MB. If you do not specify
default behavior is to create a single 10MB auto-extending data file named ibdata1. The size limit
of individual files is determined by your operating system. You can set the file size to more than
4GB on those operating systems that support big files. You can also use raw disk partitions as data
files. For detailed information on configuring
Configuration".
•
innodb_data_home_dir
Command-Line Format
Option-File Format
Option Sets Variable
Variable Name
Variable Scope
Dynamic Variable
The common part of the directory path for all
does not affect the location of per-file tablespaces when
enabled. The default value is the MySQL data directory. If you specify the value as an empty string,
you can use absolute file paths in
•
innodb_doublewrite
Version Introduced
Command-Line Format
Option-File Format
Option Sets Variable
Variable Name
Variable Scope
Dynamic Variable
If this variable is enabled (the default),
buffer, and then to the actual data files. This variable can be turned off with
innodb_doublewrite
concern for data integrity or possible failures. This variable was added in MySQL 5.0.3.
Startup Options and System Variables
InnoDB
--innodb_data_file_path=name
innodb_data_file_path
innodb_data_file_path
Global
No
--innodb_data_home_dir=path
innodb_data_home_dir
Yes,
innodb_data_home_dir
innodb_data_home_dir
Global
No
Permitted Values
Type
file name
innodb_data_file_path
5.0.3
--innodb-doublewrite
innodb_doublewrite
Yes,
innodb_doublewrite
innodb_doublewrite
Global
No
Permitted Values
Type
boolean
InnoDB
for benchmarks or cases when top performance is needed rather than
1240
[1240] to each path specified here. The file sizes are
to the size value. The sum of the sizes
G
innodb_data_file_path
tablespace files, see
InnoDB
[1240]
data files in the shared tablespace. This setting
InnoDB
innodb_file_per_table
[1240].
[1240]
stores all data twice, first to the doublewrite
[1240], the
Section 14.2.1, "InnoDB
[1241] is
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