Oracle 5.0 Reference Manual page 1219

•
Engine
The storage engine for the table. See
•
Version
The version number of the table's
•
Row_format
The row-storage format (Fixed, Dynamic, Compressed, Redundant, Compact). For
tables, (Dynamic corresponds to what
InnoDB 5.0.3, the format of
tables are always in the
InnoDB
•
Rows
The number of rows. Some storage engines, such as MyISAM, store the exact count. For other
storage engines, such as InnoDB, this value is an approximation, and may vary from the actual
value by as much as 40 to 50%. In such cases, use
The value is
Rows NULL
•
Avg_row_length
The average row length.
•
Data_length
The length of the data file.
•
Max_data_length
The maximum length of the data file. This is the total number of bytes of data that can be stored in
the table, given the data pointer size used.
•
Index_length
The length of the index file.
•
Data_free
The number of allocated but unused bytes.
•
Auto_increment
The next
AUTO_INCREMENT
•
Create_time
When the table was created.
•
Update_time
When the data file was last updated. For some storage engines, this value is NULL. For example,
stores multiple tables in its tablespace and the data file timestamp does not apply. For
InnoDB
MyISAM, the data file timestamp is used; however, on Windows the timestamp is not updated by
updates so the value is inaccurate.
•
Check_time
When the table was last checked. Not all storage engines update this time, in which case the value is
always NULL.
Syntax
SHOW
Chapter 14, Storage
file.
.frm
myisamchk -dvv
tables is reported as
InnoDB
format.
Redundant
for tables in the
INFORMATION_SCHEMA
value.
1199
Engines.
reports as Packed. Starting with MySQL/
or Compact. Prior to 5.0.3,
Redundant
to obtain an accurate count.
SELECT COUNT(*)
database.
MyISAM