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/* Copyright (C) 2000 MySQL AB & MySQL Finland AB & TCX DataKonsult 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 */
/* Check that heap-structure is ok */
#include "heapdef.h"
static int check_one_key(HP_KEYDEF *keydef,ulong records,ulong blength);
/* Returns 0 if the HEAP is ok */
int heap_check_heap(HP_INFO *info)
{
int error;
uint key;
HP_SHARE *share=info->s;
DBUG_ENTER("heap_check_keys");
for (error=key=0 ; key < share->keys ; key++)
error|=check_one_key(share->keydef+key,share->records,share->blength);
DBUG_RETURN(error);
}
static int check_one_key(HP_KEYDEF *keydef, ulong records, ulong blength)
{
int error;
uint i,found,max_links,seek,links;
uint rec_link; /* Only used with debugging */
HASH_INFO *hash_info;
error=0;
for (i=found=max_links=seek=0 ; i < records ; i++)
{
hash_info=hp_find_hash(&keydef->block,i);
if (_hp_mask(_hp_rec_hashnr(keydef,hash_info->ptr_to_rec),
blength,records) == i)
{
found++;
seek++;
links=1;
while ((hash_info=hash_info->next_key) && found < records + 1)
{
seek+= ++links;
if ((rec_link=_hp_mask(_hp_rec_hashnr(keydef,hash_info->ptr_to_rec),
blength,records))
!= i)
{
DBUG_PRINT("error",("Record in wrong link: Link %d Record: %lx Record-link %d", i,hash_info->ptr_to_rec,rec_link));
error=1;
}
else
found++;
}
if (links > max_links) max_links=links;
}
}
if (found != records)
{
DBUG_PRINT("error",("Found %ld of %ld records"));
error=1;
}
DBUG_PRINT("info",
("records: %ld seeks: %d max links: %d hitrate: %.2f",
records,seek,max_links,(float) seek / (float) records));
return error;
}
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