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99 lines
2.8 KiB
C
99 lines
2.8 KiB
C
/* Copyright (C) 2003 MySQL AB
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */
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#ifndef NDB_LIMITS_H
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#define NDB_LIMITS_H
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#define RNIL 0xffffff00
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/**
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* Note that actual value = MAX_NODES - 1,
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* since NodeId = 0 can not be used
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*/
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#define MAX_NDB_NODES 49
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#define MAX_NODES 64
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/**
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* MAX_API_NODES = MAX_NODES - No of NDB Nodes in use
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*/
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/**
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* The maximum number of replicas in the system
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*/
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#define MAX_REPLICAS 4
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/**
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* The maximum number of local checkpoints stored at a time
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*/
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#define MAX_LCP_STORED 3
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/**
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* The maximum number of log execution rounds at system restart
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*/
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#define MAX_LOG_EXEC 4
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/**
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* The maximum number of tuples per page
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**/
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#define MAX_TUPLES_PER_PAGE 8191
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#define MAX_TUPLES_BITS 13 /* 13 bits = 8191 tuples per page */
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//#define MAX_NO_OF_TUPLEKEY 16 Not currently used
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#define MAX_TABLES 1600
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#define MAX_TAB_NAME_SIZE 128
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#define MAX_ATTR_NAME_SIZE 32
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#define MAX_ATTR_DEFAULT_VALUE_SIZE 128
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#define MAX_ATTRIBUTES_IN_TABLE 128
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#define MAX_ATTRIBUTES_IN_INDEX 32
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#define MAX_TUPLE_SIZE_IN_WORDS 2013
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#define MAX_FIXED_KEY_LENGTH_IN_WORDS 8
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#define MAX_KEY_SIZE_IN_WORDS 1023
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#define MAX_FRM_DATA_SIZE 6000
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#define MIN_ATTRBUF ((MAX_ATTRIBUTES_IN_TABLE/24) + 1)
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/*
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* Number of Records to fetch per SCAN_NEXTREQ in a scan in LQH. The
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* API can order a multiple of this number of records at a time since
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* fragments can be scanned in parallel.
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*/
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#define MAX_PARALLEL_OP_PER_SCAN 16
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/*
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* Maximum number of Parallel Scan queries on one hash index fragment
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*/
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#define MAX_PARALLEL_SCANS_PER_FRAG 12
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/*
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* Maximum parallel ordered index scans per primary table fragment.
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* Implementation limit is (256 minus 12).
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*/
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#define MAX_PARALLEL_INDEX_SCANS_PER_FRAG 32
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/**
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* Computed defines
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*/
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#define MAXNROFATTRIBUTESINWORDS (MAX_ATTRIBUTES_IN_TABLE / 32)
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/*
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* Ordered index constants. Make configurable per index later.
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*/
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#define MAX_TTREE_NODE_SIZE 64 // total words in node
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#define MAX_TTREE_PREF_SIZE 4 // words in min prefix
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#define MAX_TTREE_NODE_SLACK 3 // diff between max and min occupancy
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/*
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* Blobs.
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*/
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#define NDB_BLOB_HEAD_SIZE 2 // sizeof(NdbBlob::Head) >> 2
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#endif
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