At 17:06 +0200 5/29/06, schlubediwup wrote:
2. problem
according do the mysql docu TEXT/BLOB fields depend solely on the db
environment and can grow to any length:
11.4.3. The |BLOB| and |TEXT| Types
....
The maximum size of a |BLOB| or |TEXT| object is determined by its type, but
"determined by its type" is correct.
"to any length" is incorrect.
The maximum lengths are described here:
http://dev.mysql.com/doc/refman/5.0/en/string-type-overview.html
http://dev.mysql.com/doc/refman/5.0/en/storage-requirements.html
the largest value you actually can transmit between the client and
server is determined by the amount of available memory and the size
of the communications buffers. You can change the message buffer
size by changing the value of the |max_allowed_packet| variable, but
you must do so for both the server and your client program. For
example, both *mysql* and *mysqldump* allow you to change the
client-side |max_allowed_packet| value. See Section 7.5.2, "Tuning
Server Parameters"
<http://www.ayni.com/mysql/optimization.html#server-parameters>,
Section 8.3, "mysql - The MySQL Command-Line Tool"
<http://www.ayni.com/mysql/client-side-scripts.html#mysql>, and
Section 8.8, "mysqldump - A Database Backup Program"
<http://www.ayni.com/mysql/client-side-scripts.html#mysqldump>.
....
BUT:
The table in consideration contains a column named history
containing all message text which has been sent to the mail-address
in the row in question. i ment to have observed that this column in
reality does not contain all message text from the very beginning.
today, i found out that the maximum lenght of the history fields in
all tables of this kind is 65535.
when an update is ocurring, the column history is recreated using
concat(new_text, history) so that the newest text is always at the
beginning of the column. but the oldest text at the end of the
column apparently is lost.
3. question
which parameter do i have to change in order to get this TEXT column
really to any length?
any hint is very much appreciated, thanks in advance.
suomi
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