mariadb/include/rem0types.h

/*****************************************************************************

Copyright (c) 1994, 2009, Innobase Oy. All Rights Reserved.

This program is free software; you can redistribute it and/or modify it under
the terms of the GNU General Public License as published by the Free Software
Foundation; version 2 of the License.

This program is distributed in the hope that it will be useful, but WITHOUT
ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.

You should have received a copy of the GNU General Public License along with
this program; if not, write to the Free Software Foundation, Inc., 59 Temple
Place, Suite 330, Boston, MA 02111-1307 USA

*****************************************************************************/

/********************************************************************//**
@file include/rem0types.h
Record manager global types

Created 5/30/1994 Heikki Tuuri
*************************************************************************/

#ifndef rem0types_h
#define rem0types_h

/* We define the physical record simply as an array of bytes */
typedef byte	rec_t;

/* Maximum values for various fields (for non-blob tuples) */
#define REC_MAX_N_FIELDS	(1024 - 1)
#define REC_MAX_HEAP_NO		(2 * 8192 - 1)
#define REC_MAX_N_OWNED		(16 - 1)

/* REC_MAX_INDEX_COL_LEN is measured in bytes and is the maximum
indexed column length (or indexed prefix length). It is set to 3*256,
so that one can create a column prefix index on 256 characters of a
TEXT or VARCHAR column also in the UTF-8 charset. In that charset,
a character may take at most 3 bytes.
This constant MUST NOT BE CHANGED, or the compatibility of InnoDB data
files would be at risk! */
#define REC_MAX_INDEX_COL_LEN	768

#endif