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/* Copyright (C) 2003 MySQL AB
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; either version 2 of the License, or
(at your option) any later version.
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 */
#ifndef NDB_LIMITS_H
#define NDB_LIMITS_H
#define RNIL 0xffffff00
/**
* Note that actual value = MAX_NODES - 1,
* since NodeId = 0 can not be used
*/
#define MAX_NDB_NODES 49
#define MAX_NODES 64
/**
* MAX_API_NODES = MAX_NODES - No of NDB Nodes in use
*/
/**
* The maximum number of replicas in the system
*/
#define MAX_REPLICAS 4
/**
* The maximum number of local checkpoints stored at a time
*/
#define MAX_LCP_STORED 3
/**
* The maximum number of log execution rounds at system restart
*/
#define MAX_LOG_EXEC 4
/**
* The maximum number of tuples per page
**/
#define MAX_TUPLES_PER_PAGE 8191
#define MAX_TUPLES_BITS 13 /* 13 bits = 8191 tuples per page */
#define MAX_TABLES 1600
#define MAX_TAB_NAME_SIZE 128
#define MAX_ATTR_NAME_SIZE 32
#define MAX_ATTR_DEFAULT_VALUE_SIZE 128
#define MAX_ATTRIBUTES_IN_TABLE 128
#define MAX_ATTRIBUTES_IN_INDEX 32
#define MAX_TUPLE_SIZE_IN_WORDS 2013
#define MAX_KEY_SIZE_IN_WORDS 1023
#define MAX_FRM_DATA_SIZE 6000
#define MAX_NULL_BITS 4096
#define MAX_FRAGMENT_DATA_BYTES (4+(2 * 8 * MAX_REPLICAS * MAX_NDB_NODES))
#define MIN_ATTRBUF ((MAX_ATTRIBUTES_IN_TABLE/24) + 1)
/*
* Max Number of Records to fetch per SCAN_NEXTREQ in a scan in LQH. The
* API can order a multiple of this number of records at a time since
* fragments can be scanned in parallel.
*/
#define MAX_PARALLEL_OP_PER_SCAN 992
/*
* The default batch size. Configurable parameter.
*/
#define DEF_BATCH_SIZE 64
/*
* When calculating the number of records sent from LQH in each batch
* one uses SCAN_BATCH_SIZE divided by the expected size of signals
* per row. This gives the batch size used for the scan. The NDB API
* will receive one batch from each node at a time so there has to be
* some care taken also so that the NDB API is not overloaded with
* signals.
* This parameter is configurable, this is the default value.
*/
#define SCAN_BATCH_SIZE 32768
/*
* To protect the NDB API from overload we also define a maximum total
* batch size from all nodes. This parameter should most likely be
* configurable, or dependent on sendBufferSize.
* This parameter is configurable, this is the default value.
*/
#define MAX_SCAN_BATCH_SIZE 262144
/*
* Maximum number of Parallel Scan queries on one hash index fragment
*/
#define MAX_PARALLEL_SCANS_PER_FRAG 12
/*
* Maximum parallel ordered index scans per primary table fragment.
* Implementation limit is (256 minus 12).
*/
#define MAX_PARALLEL_INDEX_SCANS_PER_FRAG 32
/**
* Computed defines
*/
#define MAXNROFATTRIBUTESINWORDS (MAX_ATTRIBUTES_IN_TABLE / 32)
/*
* Ordered index constants. Make configurable per index later.
*/
#define MAX_TTREE_NODE_SIZE 64 /* total words in node */
#define MAX_TTREE_PREF_SIZE 4 /* words in min prefix */
#define MAX_TTREE_NODE_SLACK 2 /* diff between max and min occupancy */
/*
* Blobs.
*/
#define NDB_BLOB_HEAD_SIZE 2 /* sizeof(NdbBlob::Head) >> 2 */
/*
* Character sets.
*/
#define MAX_XFRM_MULTIPLY 8 /* max expansion when normalizing */
/*
* Long signals
*/
#define NDB_SECTION_SEGMENT_SZ 60
#endif
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