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/* Copyright (c) 2000, 2025, Oracle and/or its affiliates.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License, version 2.0,
as published by the Free Software Foundation.
This program is designed to work with certain software (including
but not limited to OpenSSL) that is licensed under separate terms,
as designated in a particular file or component or in included license
documentation. The authors of MySQL hereby grant you an additional
permission to link the program and your derivative works with the
separately licensed software that they have either included with
the program or referenced in the documentation.
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, version 2.0, 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 St, Fifth Floor, Boston, MA 02110-1301 USA */
/* Check that heap-structure is ok */
#include <sys/types.h>
#include "my_dbug.h"
#include "my_inttypes.h"
#include "storage/heap/heapdef.h"
static int check_one_key(HP_KEYDEF *keydef, uint keynr, ulong records,
ulong blength, bool print_status);
static int check_one_rb_key(HP_INFO *info, uint keynr, ulong records,
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, 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_TRACE;
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 basically 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,
(ulong)share->records, deleted, (ulong)share->deleted));
error = 1;
}
*info = save_info;
return error;
}
static int check_one_key(HP_KEYDEF *keydef, uint keynr, ulong records,
ulong blength, 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 (hp_mask(hash_info->hash, blength, records) == i) {
found++;
seek++;
links = 1;
while ((hash_info = hash_info->next_key) && found < records + 1) {
seek += ++links;
if (i != (rec_link = hp_mask(hash_info->hash, blength, records))) {
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",
("records: %ld seeks: %lu max links: %lu hitrate: %.2f "
"buckets: %lu",
records, seek, max_links, (float)seek / (float)(records ? records : 1),
hash_buckets_found));
if (print_status)
printf(
"Key: %d 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(HP_INFO *info, uint keynr, ulong records,
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];
if ((key = (uchar *)tree_search_edge(&keydef->rb_tree, info->parents,
&info->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, nullptr);
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 = (uchar *)tree_search_next(&keydef->rb_tree, &info->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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