Oracle 5.0 Reference Manual page 350

myisamchk
•
no endspace
Do not store endspace.
•
no endspace, not_always
Do not store endspace and do not do endspace compression for all values.
•
no endspace, no empty
Do not store endspace. Do not store empty values.
•
table-lookup
The column was converted to an ENUM.
•
zerofill(N)
The most significant
•
no zeros
Do not store zeros.
•
always zero
Zero values are stored using one bit.
•
Huff tree
The number of the Huffman tree associated with the column.
•
Bits
The number of bits used in the Huffman tree.
The and
Huff tree Bits
See Section 4.6.5, "myisampack
example of this information.
Example of
myisamchk -eiv
Checking MyISAM file: person
Data records: 306688
- check file-size
- check record delete-chain
No recordlinks
- check key delete-chain
block_size 1024:
- check index reference
- check data record references index: 1
Key: 1: Keyblocks used:
- check data record references index: 2
Key: 2: Keyblocks used:
- check data record references index: 3
Key: 3: Keyblocks used:
Total: Keyblocks used:
- check records and index
Records: 306688
Recordspace used:
Record blocks: 306688
Record data: 7934464
Lost space: 256512
— MyISAM Table-Maintenance Utility
bytes in the value are always 0 and are not stored.
N
fields are displayed if the table has been compressed with myisampack.
— Generate Compressed, Read-Only MyISAM
output:
Deleted blocks:
98% Packed: 0%
99% Packed: 97%
98% Packed: -14%
98% Packed: 89%
references*** LOTS OF ROW NUMBERS DELETED ***
M.recordlength:
97% Empty space:
Delete blocks:
Deleted data:
Linkdata:
330
0
Max levels: 3
Max levels: 3
Max levels: 3
25 Packed:
2% Blocks/Record:
0
0
1156096
Tables", for an
83%
1.00