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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, uint keynr, ulong records,
ulong blength, my_bool print_status);
/*
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(HP_INFO *info,my_bool print_status)
{
int error;
uint key;
ulong records=0, deleted=0, pos, next_block;
HP_SHARE *share=info->s;
HP_INFO save_info= *info; /* Needed because scan_init */
DBUG_ENTER("heap_check_heap");
for (error=key= 0 ; key < share->keys ; key++)
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)
{
info->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 */
}
}
_hp_find_record(info,pos);
if (!info->current_ptr[share->reclength])
deleted++;
else
records++;
}
if (records != share->records || deleted != share->deleted)
{
DBUG_PRINT("error",("Found rows: %lu (%lu) deleted %lu (%lu)",
records, share->records, deleted, share->deleted));
error= 1;
}
*info= save_info;
DBUG_RETURN(error);
}
static int check_one_key(HP_KEYDEF *keydef, uint keynr, ulong records,
ulong blength, my_bool print_status)
{
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 ? records : 1)));
if (print_status)
printf("Key: %d records: %ld seeks: %d max links: %d hitrate: %.2f\n",
keynr, records, seek, max_links,
(float) seek / (float) (records ? records : 1));
return error;
}
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