Oracle ACFS Command-Line Tools for Compression
This topic provides a summary of commands to manage Oracle ACFS compression.
Table 6-72 lists Oracle ACFS compression commands with brief descriptions. For an overview of Oracle ACFS compression, refer to Oracle ACFS Compression.
For more information about running Oracle ACFS acfsutil
commands, refer to About Using Oracle ACFS Command-Line Tools.
Table 6-72 Summary of commands for Oracle ACFS compression
Command | Description |
---|---|
Copies and compresses a file or files in a directory. |
|
Displays compression information about a file. |
|
Disables Oracle ACFS file compression. |
|
Enables Oracle ACFS file compression. |
acfsutil compress copy
Purpose
Compresses and copies a file.
Syntax and Description
acfsutil compress copy -h acfsutil compress copy [-v] [-f] {-c size source | [-n] {-r source | source [...]} target_dir
The following table contains the options available with the acfsutil
compress
copy
command.
Table 6-73 Options for the acfsutil compress copy command
Option | Description |
---|---|
|
Specifies verbose mode. |
|
Specifies to overwrite any existing copies. |
|
Copies a single source file and uses compression unit (CU) size for the copy. The format of size is n |
|
Specifies that copies created are not compressed. |
|
Specifies to recursively copy files and directories starting from a single source directory. |
|
Specifies source files to be copy. |
|
Specifies the target directory to copy into. |
The acfsutil
compress
copy
command does not copy over an existing files unless the -f
option is used. If -f
is not used, the copy operation terminates when the first existing target is found.
The command does not copy to an Oracle ACFS file system which is capable of supporting compression if compression is disabled unless the -n
option is specified.
Example 6-61 Using the acfsutil compress copy command
$ /sbin/acfsutil compress copy -v -f my_file1 my_file2 /my_target_directory
acfsutil compress info
Purpose
Displays information about compressed files.
Syntax and Description
acfsutil compress info -h
acfsutil compress info pathname
The following table contains the options available with the acfsutil
compress
info
command.
Table 6-74 Options for the acfsutil compress info command
Option | Description |
---|---|
|
Specifies the pathname to a file. |
Example 6-62 Using the acfsutil compress info command
$ /sbin/acfsutil compress info /my_mount_point/testfile1 Compression Unit size: 8192 Disk storage used: ( 189.89 MB ) Disk storage saved: ( 810.20 MB ) Storage used is 18% of what the uncompressed file would use
acfsutil compress off
Purpose
Disables Oracle ACFS compression.
Syntax and Description
acfsutil compress off -h
acfsutil compress off mount_point
The following table contains the options available with the acfsutil
compress
off
command.
Table 6-75 Options for the acfsutil compress off command
Option | Description |
---|---|
|
Specifies the directory where the file system is mounted. |
When running acfsutil
compress
off
, the following apply:
-
Files that are created after compression is disabled are created uncompressed.
-
Any compressed files in the file system remain compressed.
You must have root or system administrator privileges to run this command.
Example 6-63 Using the acfsutil compress off command
$ /sbin/acfsutil compress off /my_mount_point
acfsutil compress on
Purpose
Enables Oracle ACFS compression.
Syntax and Description
acfsutil compress on -h acfsutil compress on [-a algorithm] mount_point
The following table contains the options available with the acfsutil
compress
on
command.
Table 6-76 Options for the acfsutil compress on command
Option | Description |
---|---|
|
Specifies the default compression algorithm. Currently only |
|
Specifies the directory where the file system is mounted. |
Note:
Oracle ACFS compression is not supported on Oracle Database files. Oracle ACFS file systems which are intended to hold database files should not be compressed with Oracle ACFS compression.
When running acfsutil
compress
on
, the following apply:
-
Files created after compression is enabled are compressed by default.
-
Any uncompressed files in the file system remain uncompressed.
You must have root or system administrator privileges to run this command.
Example 6-64 Using the acfsutil compress on command
$ /sbin/acfsutil compress on /my_mount_point