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/* Copyright (c) 2000, 2002-2007 MySQL AB
Use is subject to license terms
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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1335 USA */
/* Check that heap-structure is ok */
#include "heapdef.h"
static int check_one_key(HP_KEYDEF *, uint, ulong, ulong, my_bool);
static int check_one_rb_key(const HP_INFO *, uint, ulong, my_bool);
/*
Check if keys and rows are ok in a heap table
SYNOPSIS
heap_check_heap()
info Table handler
print_status Prints some extra status
NOTES
Doesn't change the state of the table handler
RETURN VALUES
0 ok
1 error
*/
int heap_check_heap(const HP_INFO *info, my_bool print_status)
{
int error;
uint key;
ulong records=0, deleted=0, pos, next_block;
HP_SHARE *share=info->s;
uchar *current_ptr= info->current_ptr;
DBUG_ENTER("heap_check_heap");
for (error=key= 0 ; key < share->keys ; key++)
{
if (share->keydef[key].algorithm == HA_KEY_ALG_BTREE)
error|= check_one_rb_key(info, key, share->records, print_status);
else
error|= check_one_key(share->keydef + key, key, share->records,
share->blength, print_status);
}
/*
This is basicly the same code as in hp_scan, but we repeat it here to
get shorter DBUG log file.
*/
for (pos=next_block= 0 ; ; pos++)
{
if (pos < next_block)
{
current_ptr+= share->block.recbuffer;
}
else
{
next_block+= share->block.records_in_block;
if (next_block >= share->records+share->deleted)
{
next_block= share->records+share->deleted;
if (pos >= next_block)
break; /* End of file */
}
}
current_ptr= hp_find_block(&share->block, pos);
if (!current_ptr[share->visible])
deleted++;
else
records++;
}
if (records != share->records || deleted != share->deleted)
{
DBUG_PRINT("error",("Found rows: %lu (%lu) deleted %lu (%lu)",
records, (ulong) share->records,
deleted, (ulong) share->deleted));
error= 1;
}
DBUG_RETURN(error);
}
static int check_one_key(HP_KEYDEF *keydef, uint keynr, ulong records,
ulong blength, my_bool print_status)
{
int error;
ulong i,found,max_links,seek,links;
ulong rec_link; /* Only used with debugging */
ulong hash_buckets_found;
HASH_INFO *hash_info;
error=0;
hash_buckets_found= 0;
for (i=found=max_links=seek=0 ; i < records ; i++)
{
hash_info=hp_find_hash(&keydef->block,i);
if (hash_info->hash_of_key != hp_rec_hashnr(keydef, hash_info->ptr_to_rec))
{
DBUG_PRINT("error",
("Found row with wrong hash_of_key at position %lu", i));
error= 1;
}
if (hp_mask(hash_info->hash_of_key, blength, records) == i)
{
found++;
seek++;
links=1;
while ((hash_info=hash_info->next_key) && found < records + 1)
{
seek+= ++links;
if ((rec_link= hp_mask(hash_info->hash_of_key, blength, records)) != i)
{
DBUG_PRINT("error",
("Record in wrong link: Link %lu Record: %p Record-link %lu",
i, hash_info->ptr_to_rec, rec_link));
error=1;
}
else
found++;
}
if (links > max_links) max_links=links;
hash_buckets_found++;
}
}
if (found != records)
{
DBUG_PRINT("error",("Found %ld of %ld records", found, records));
error=1;
}
if (keydef->hash_buckets != hash_buckets_found)
{
DBUG_PRINT("error",("Found %ld buckets, stats shows %ld buckets",
hash_buckets_found, (long) keydef->hash_buckets));
error=1;
}
DBUG_PRINT("info",
("key: %u records: %ld seeks: %lu max links: %lu "
"hitrate: %.2f buckets: %lu",
keynr, records,seek,max_links,
(float) seek / (float) (records ? records : 1),
hash_buckets_found));
if (print_status)
printf("Key: %u records: %ld seeks: %lu max links: %lu "
"hitrate: %.2f buckets: %lu\n",
keynr, records, seek, max_links,
(float) seek / (float) (records ? records : 1),
hash_buckets_found);
return error;
}
static int check_one_rb_key(const HP_INFO *info, uint keynr, ulong records,
my_bool print_status)
{
HP_KEYDEF *keydef= info->s->keydef + keynr;
int error= 0;
ulong found= 0;
uchar *key, *recpos;
uint key_length;
uint not_used[2];
TREE_ELEMENT **last_pos;
TREE_ELEMENT *parents[MAX_TREE_HEIGHT+1];
if ((key= tree_search_edge(&keydef->rb_tree, parents,
&last_pos, offsetof(TREE_ELEMENT, left))))
{
do
{
memcpy(&recpos, key + (*keydef->get_key_length)(keydef,key), sizeof(uchar*));
key_length= hp_rb_make_key(keydef, info->recbuf, recpos, 0);
if (ha_key_cmp(keydef->seg, (uchar*) info->recbuf, (uchar*) key,
key_length, SEARCH_FIND | SEARCH_SAME, not_used))
{
error= 1;
DBUG_PRINT("error",("Record in wrong link: key: %u Record: %p\n",
keynr, recpos));
}
else
found++;
key= tree_search_next(&keydef->rb_tree, &last_pos,
offsetof(TREE_ELEMENT, left),
offsetof(TREE_ELEMENT, right));
} while (key);
}
if (found != records)
{
DBUG_PRINT("error",("Found %lu of %lu records", found, records));
error= 1;
}
if (print_status)
printf("Key: %d records: %ld\n", keynr, records);
return error;
}
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