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ha_myisam.cc
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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 */
#define MYSQL_SERVER 1
#include "storage/myisam/ha_myisam.h"
#include <fcntl.h>
#include <limits.h>
#include <stdarg.h>
#include <algorithm>
#include <bit>
#include <new>
#include "lex_string.h"
#include "m_string.h"
#include "my_compiler.h"
#include "my_dbug.h"
#include "my_io.h"
#include "my_psi_config.h"
#include "myisam.h"
#include "myisampack.h"
#include "mysql/plugin.h"
#include "mysql/strings/int2str.h"
#include "mysql/strings/m_ctype.h"
#include "nulls.h"
#include "sql/current_thd.h"
#include "sql/derror.h"
#include "sql/field.h"
#include "sql/key.h" // key_copy
#include "sql/log.h"
#include "sql/mysqld.h"
#include "sql/protocol.h"
#include "sql/sql_class.h" // THD
#include "sql/sql_lex.h"
#include "sql/sql_plugin.h"
#include "sql/sql_table.h" // tablename_to_filename
#include "sql/system_variables.h"
#include "storage/myisam/myisamdef.h"
#include "storage/myisam/rt_index.h"
#include "strxmov.h"
#include "mysql/components/services/log_builtins.h"
using std::max;
using std::min;
ulonglong myisam_recover_options;
static ulong opt_myisam_block_size;
/* Interface to mysqld, to check system tables supported by SE */
static bool myisam_is_supported_system_table(const char *db,
const char *table_name,
bool is_sql_layer_system_table);
/* bits in myisam_recover_options */
const char *myisam_recover_names[] = {"DEFAULT", "BACKUP", "FORCE",
"QUICK", "OFF", NullS};
TYPELIB myisam_recover_typelib = {array_elements(myisam_recover_names) - 1, "",
myisam_recover_names, nullptr};
const char *myisam_stats_method_names[] = {"nulls_unequal", "nulls_equal",
"nulls_ignored", NullS};
TYPELIB myisam_stats_method_typelib = {
array_elements(myisam_stats_method_names) - 1, "",
myisam_stats_method_names, nullptr};
static MYSQL_SYSVAR_ULONG(block_size, opt_myisam_block_size,
PLUGIN_VAR_NOSYSVAR | PLUGIN_VAR_RQCMDARG,
"Block size to be used for MyISAM index pages",
nullptr, nullptr, MI_KEY_BLOCK_LENGTH,
MI_MIN_KEY_BLOCK_LENGTH, MI_MAX_KEY_BLOCK_LENGTH,
MI_MIN_KEY_BLOCK_LENGTH);
static MYSQL_SYSVAR_ULONG(data_pointer_size, myisam_data_pointer_size,
PLUGIN_VAR_RQCMDARG,
"Default pointer size to be used for MyISAM tables",
nullptr, nullptr, 6, 2, 7, 1);
#define MB (1024 * 1024)
static MYSQL_SYSVAR_ULONGLONG(
max_sort_file_size, myisam_max_temp_length, PLUGIN_VAR_RQCMDARG,
"Don't use the fast sort index method to created "
"index if the temporary file would get bigger than this",
nullptr, nullptr, LONG_MAX / MB * MB, 0, MAX_FILE_SIZE, MB);
static MYSQL_SYSVAR_SET(
recover_options, myisam_recover_options,
PLUGIN_VAR_OPCMDARG | PLUGIN_VAR_READONLY,
"Syntax: myisam-recover-options[=option[,option...]], where option can be "
"DEFAULT, BACKUP, FORCE, QUICK, or OFF",
nullptr, nullptr, 0, &myisam_recover_typelib);
static MYSQL_THDVAR_ULONGLONG(
sort_buffer_size, PLUGIN_VAR_RQCMDARG,
"The buffer that is allocated when sorting the index when doing "
"a REPAIR or when creating indexes with CREATE INDEX or ALTER TABLE",
nullptr, nullptr, 8192 * 1024, (long)(MIN_SORT_BUFFER + MALLOC_OVERHEAD),
SIZE_T_MAX, 1);
static MYSQL_SYSVAR_BOOL(
use_mmap, opt_myisam_use_mmap, PLUGIN_VAR_NOCMDARG,
"Use memory mapping for reading and writing MyISAM tables", nullptr,
nullptr, false);
static MYSQL_SYSVAR_ULONGLONG(mmap_size, myisam_mmap_size,
PLUGIN_VAR_RQCMDARG | PLUGIN_VAR_READONLY,
"Restricts the total memory "
"used for memory mapping of MySQL tables",
nullptr, nullptr, SIZE_T_MAX, MEMMAP_EXTRA_MARGIN,
SIZE_T_MAX, 1);
static MYSQL_THDVAR_ENUM(
stats_method, PLUGIN_VAR_RQCMDARG,
"Specifies how MyISAM index statistics collection code should "
"treat NULLs. Possible values of name are NULLS_UNEQUAL (default "
"behavior for 4.1 and later), NULLS_EQUAL (emulate 4.0 behavior), "
"and NULLS_IGNORED",
nullptr, nullptr, MI_STATS_METHOD_NULLS_NOT_EQUAL,
&myisam_stats_method_typelib);
#ifndef NDEBUG
/**
Causes the thread to wait in a spin lock for a query kill signal.
This function is used by the test frame work to identify race conditions.
The signal is caught and ignored and the thread is not killed.
*/
static void debug_wait_for_kill(const char *info) {
DBUG_TRACE;
const char *prev_info;
THD *thd;
thd = current_thd;
prev_info = thd_proc_info(thd, info);
while (!thd->killed) my_sleep(1000);
DBUG_PRINT("info", ("Exit debug_wait_for_kill"));
thd_proc_info(thd, prev_info);
}
#endif
/*****************************************************************************
** MyISAM tables
*****************************************************************************/
static handler *myisam_create_handler(handlerton *hton, TABLE_SHARE *table,
bool, MEM_ROOT *mem_root) {
return new (mem_root) ha_myisam(hton, table);
}
// collect errors printed by mi_check routines
static void mi_check_print_msg(MI_CHECK *param, const char *msg_type,
const char *fmt, va_list args)
MY_ATTRIBUTE((format(printf, 3, 0)));
static void mi_check_print_msg(MI_CHECK *param, const char *msg_type,
const char *fmt, va_list args) {
THD *thd = (THD *)param->thd;
Protocol *protocol = thd->get_protocol();
size_t length, msg_length;
char msgbuf[MI_MAX_MSG_BUF];
char name[NAME_LEN * 2 + 2];
msg_length = vsnprintf(msgbuf, sizeof(msgbuf), fmt, args);
msgbuf[sizeof(msgbuf) - 1] = 0; // healthy paranoia
DBUG_PRINT(msg_type, ("message: %s", msgbuf));
if (!thd->get_protocol()->connection_alive()) {
LogErr(ERROR_LEVEL, ER_MYISAM_CHECK_METHOD_ERROR, msgbuf);
return;
}
if (param->testflag &
(T_CREATE_MISSING_KEYS | T_SAFE_REPAIR | T_AUTO_REPAIR)) {
my_message(ER_NOT_KEYFILE, msgbuf, MYF(MY_WME));
return;
}
length = (uint)(strxmov(name, param->db_name, ".", param->table_name, NullS) -
name);
/*
TODO: switch from protocol to push_warning here. The main reason we didn't
it yet is parallel repair. Due to following trace:
mi_check_print_msg/push_warning/sql_alloc/my_pthread_getspecific_ptr.
*/
protocol->start_row();
protocol->store_string(name, length, system_charset_info);
protocol->store(param->op_name, system_charset_info);
protocol->store(msg_type, system_charset_info);
protocol->store_string(msgbuf, msg_length, system_charset_info);
if (protocol->end_row())
LogErr(ERROR_LEVEL, ER_MY_NET_WRITE_FAILED_FALLING_BACK_ON_STDERR, msgbuf);
return;
}
/*
Convert TABLE object to MyISAM key and column definition
SYNOPSIS
table2myisam()
table_arg in TABLE object.
keydef_out out MyISAM key definition.
recinfo_out out MyISAM column definition.
records_out out Number of fields.
DESCRIPTION
This function will allocate and initialize MyISAM key and column
definition for further use in mi_create or for a check for underlying
table conformance in merge engine.
The caller needs to free *recinfo_out after use. Since *recinfo_out
and *keydef_out are allocated with a my_multi_malloc, *keydef_out
is freed automatically when *recinfo_out is freed.
RETURN VALUE
0 OK
!0 error code
*/
int table2myisam(TABLE *table_arg, MI_KEYDEF **keydef_out,
MI_COLUMNDEF **recinfo_out, uint *records_out) {
uint i, j, recpos, minpos, fieldpos, temp_length, length;
enum ha_base_keytype type = HA_KEYTYPE_BINARY;
uchar *record;
KEY *pos;
MI_KEYDEF *keydef;
MI_COLUMNDEF *recinfo, *recinfo_pos;
HA_KEYSEG *keyseg;
TABLE_SHARE *share = table_arg->s;
uint options = share->db_options_in_use;
DBUG_TRACE;
if (!(my_multi_malloc(PSI_INSTRUMENT_ME, MYF(MY_WME), recinfo_out,
(share->fields * 2 + 2) * sizeof(MI_COLUMNDEF),
keydef_out, share->keys * sizeof(MI_KEYDEF), &keyseg,
(share->key_parts + share->keys) * sizeof(HA_KEYSEG),
NullS)))
return HA_ERR_OUT_OF_MEM; /* purecov: inspected */
keydef = *keydef_out;
recinfo = *recinfo_out;
pos = table_arg->key_info;
for (i = 0; i < share->keys; i++, pos++) {
keydef[i].flag =
((uint16)pos->flags & (HA_NOSAME | HA_FULLTEXT | HA_SPATIAL));
assert(pos->algorithm != HA_KEY_ALG_SE_SPECIFIC);
assert(!(pos->flags & HA_SPATIAL) || pos->algorithm == HA_KEY_ALG_RTREE);
assert(!(pos->flags & HA_FULLTEXT) ||
pos->algorithm == HA_KEY_ALG_FULLTEXT);
keydef[i].key_alg = pos->algorithm;
keydef[i].block_length = pos->block_size;
keydef[i].seg = keyseg;
keydef[i].keysegs = pos->user_defined_key_parts;
for (j = 0; j < pos->user_defined_key_parts; j++) {
Field *field = pos->key_part[j].field;
type = field->key_type();
keydef[i].seg[j].flag = pos->key_part[j].key_part_flag;
if (options & HA_OPTION_PACK_KEYS ||
(pos->flags &
(HA_PACK_KEY | HA_BINARY_PACK_KEY | HA_SPACE_PACK_USED))) {
if (pos->key_part[j].length > 8 &&
(type == HA_KEYTYPE_TEXT || type == HA_KEYTYPE_NUM ||
(type == HA_KEYTYPE_BINARY && !field->zero_pack()))) {
/* No blobs here */
if (j == 0) keydef[i].flag |= HA_PACK_KEY;
if (!field->is_flag_set(ZEROFILL_FLAG) &&
(field->type() == MYSQL_TYPE_STRING ||
field->type() == MYSQL_TYPE_VAR_STRING ||
((int)(pos->key_part[j].length - field->decimals())) >= 4))
keydef[i].seg[j].flag |= HA_SPACE_PACK;
} else if (j == 0 &&
(!(pos->flags & HA_NOSAME) || pos->key_length > 16))
keydef[i].flag |= HA_BINARY_PACK_KEY;
}
keydef[i].seg[j].type = (int)type;
keydef[i].seg[j].start = pos->key_part[j].offset;
keydef[i].seg[j].length = pos->key_part[j].length;
keydef[i].seg[j].bit_start = keydef[i].seg[j].bit_end =
keydef[i].seg[j].bit_length = 0;
keydef[i].seg[j].bit_pos = 0;
keydef[i].seg[j].language = field->charset_for_protocol()->number;
if (field->is_nullable()) {
keydef[i].seg[j].null_bit = field->null_bit;
keydef[i].seg[j].null_pos = field->null_offset();
} else {
keydef[i].seg[j].null_bit = 0;
keydef[i].seg[j].null_pos = 0;
}
if (field->type() == MYSQL_TYPE_BLOB ||
field->type() == MYSQL_TYPE_VECTOR ||
field->type() == MYSQL_TYPE_GEOMETRY) {
keydef[i].seg[j].flag |= HA_BLOB_PART;
/* save number of bytes used to pack length */
keydef[i].seg[j].bit_start =
(uint)(field->pack_length() - portable_sizeof_char_ptr);
} else if (field->type() == MYSQL_TYPE_BIT) {
keydef[i].seg[j].bit_length = ((Field_bit *)field)->bit_len;
keydef[i].seg[j].bit_start = ((Field_bit *)field)->bit_ofs;
keydef[i].seg[j].bit_pos = (uint)(((Field_bit *)field)->bit_ptr -
(uchar *)table_arg->record[0]);
}
}
keyseg += pos->user_defined_key_parts;
}
if (table_arg->found_next_number_field)
keydef[share->next_number_index].flag |= HA_AUTO_KEY;
record = table_arg->record[0];
recpos = 0;
recinfo_pos = recinfo;
while (recpos < (uint)share->stored_rec_length) {
Field **field, *found = nullptr;
minpos = share->reclength;
length = 0;
for (field = table_arg->field; *field; field++) {
if ((fieldpos = (*field)->offset(record)) >= recpos &&
fieldpos <= minpos) {
/* skip null fields */
if (!(temp_length = (*field)->pack_length_in_rec()))
continue; /* Skip null-fields */
if (!found || fieldpos < minpos ||
(fieldpos == minpos && temp_length < length)) {
minpos = fieldpos;
found = *field;
length = temp_length;
}
}
}
DBUG_PRINT("loop", ("found: %p recpos: %d minpos: %d length: %d", found,
recpos, minpos, length));
if (recpos != minpos) { // Reserved space (Null bits?)
memset(recinfo_pos, 0, sizeof(*recinfo_pos));
recinfo_pos->type = (int)FIELD_NORMAL;
recinfo_pos++->length = (uint16)(minpos - recpos);
}
if (!found) break;
if (found->is_flag_set(BLOB_FLAG))
recinfo_pos->type = (int)FIELD_BLOB;
else if (found->type() == MYSQL_TYPE_VARCHAR)
recinfo_pos->type = FIELD_VARCHAR;
else if (!(options & HA_OPTION_PACK_RECORD))
recinfo_pos->type = (int)FIELD_NORMAL;
else if (found->zero_pack())
recinfo_pos->type = (int)FIELD_SKIP_ZERO;
else
recinfo_pos->type =
(int)((length <= 3 || (found->is_flag_set(ZEROFILL_FLAG)))
? FIELD_NORMAL
: found->type() == MYSQL_TYPE_STRING ||
found->type() == MYSQL_TYPE_VAR_STRING
? FIELD_SKIP_ENDSPACE
: FIELD_SKIP_PRESPACE);
if (found->is_nullable()) {
recinfo_pos->null_bit = found->null_bit;
recinfo_pos->null_pos = found->null_offset();
} else {
recinfo_pos->null_bit = 0;
recinfo_pos->null_pos = 0;
}
(recinfo_pos++)->length = (uint16)length;
recpos = minpos + length;
DBUG_PRINT("loop", ("length: %d type: %d", recinfo_pos[-1].length,
recinfo_pos[-1].type));
}
*records_out = (uint)(recinfo_pos - recinfo);
return 0;
}
/*
Check for underlying table conformance
SYNOPSIS
check_definition()
t1_keyinfo in First table key definition
t1_recinfo in First table record definition
t1_keys in Number of keys in first table
t1_recs in Number of records in first table
t2_keyinfo in Second table key definition
t2_recinfo in Second table record definition
t2_keys in Number of keys in second table
t2_recs in Number of records in second table
strict in Strict check switch
DESCRIPTION
This function compares two MyISAM definitions. By intention it was done
to compare merge table definition against underlying table definition.
It may also be used to compare dot-frm and MYI definitions of MyISAM
table as well to compare different MyISAM table definitions.
For merge table it is not required that number of keys in merge table
must exactly match number of keys in underlying table. When calling this
function for underlying table conformance check, 'strict' flag must be
set to false, and converted merge definition must be passed as t1_*.
Otherwise 'strict' flag must be set to 1 and it is not required to pass
converted dot-frm definition as t1_*.
For compatibility reasons we relax some checks, specifically:
- 4.0 (and earlier versions) always set key_alg to 0.
- 4.0 (and earlier versions) have the same language for all keysegs.
RETURN VALUE
0 - Equal definitions.
1 - Different definitions.
TODO
- compare FULLTEXT keys;
- compare SPATIAL keys;
- compare FIELD_SKIP_ZERO which is converted to FIELD_NORMAL correctly
(should be correctly detected in table2myisam).
*/
int check_definition(MI_KEYDEF *t1_keyinfo, MI_COLUMNDEF *t1_recinfo,
uint t1_keys, uint t1_recs, MI_KEYDEF *t2_keyinfo,
MI_COLUMNDEF *t2_recinfo, uint t2_keys, uint t2_recs,
bool strict) {
uint i, j;
DBUG_TRACE;
if ((strict ? t1_keys != t2_keys : t1_keys > t2_keys)) {
DBUG_PRINT("error", ("Number of keys differs: t1_keys=%u, t2_keys=%u",
t1_keys, t2_keys));
return 1;
}
if (t1_recs != t2_recs) {
DBUG_PRINT("error", ("Number of recs differs: t1_recs=%u, t2_recs=%u",
t1_recs, t2_recs));
return 1;
}
for (i = 0; i < t1_keys; i++) {
HA_KEYSEG *t1_keysegs = t1_keyinfo[i].seg;
HA_KEYSEG *t2_keysegs = t2_keyinfo[i].seg;
if (t1_keyinfo[i].flag & HA_FULLTEXT && t2_keyinfo[i].flag & HA_FULLTEXT)
continue;
else if (t1_keyinfo[i].flag & HA_FULLTEXT ||
t2_keyinfo[i].flag & HA_FULLTEXT) {
DBUG_PRINT("error", ("Key %d has different definition", i));
DBUG_PRINT("error",
("t1_fulltext= %d, t2_fulltext=%d",
static_cast<bool>(t1_keyinfo[i].flag & HA_FULLTEXT),
static_cast<bool>(t2_keyinfo[i].flag & HA_FULLTEXT)));
return 1;
}
if (t1_keyinfo[i].flag & HA_SPATIAL && t2_keyinfo[i].flag & HA_SPATIAL)
continue;
else if (t1_keyinfo[i].flag & HA_SPATIAL ||
t2_keyinfo[i].flag & HA_SPATIAL) {
DBUG_PRINT("error", ("Key %d has different definition", i));
DBUG_PRINT("error", ("t1_spatial= %d, t2_spatial=%d",
static_cast<bool>(t1_keyinfo[i].flag & HA_SPATIAL),
static_cast<bool>(t2_keyinfo[i].flag & HA_SPATIAL)));
return 1;
}
if (!(t1_keyinfo[i].key_alg == t2_keyinfo[i].key_alg ||
/*
Pre-8.0 server stored HA_KEY_ALG_HASH value for MyISAM tables
but treated it as HA_KEY_ALG_BTREE. Starting from 8.0 we store
correct algorithm value in the data-dictionary. So we have to
relax our check in order to be able to open old tables in 8.0.
*/
(t1_keyinfo[i].key_alg == HA_KEY_ALG_BTREE &&
t2_keyinfo[i].key_alg == HA_KEY_ALG_HASH)) ||
t1_keyinfo[i].keysegs != t2_keyinfo[i].keysegs) {
DBUG_PRINT("error", ("Key %d has different definition", i));
DBUG_PRINT("error", ("t1_keysegs=%d, t1_key_alg=%d",
t1_keyinfo[i].keysegs, t1_keyinfo[i].key_alg));
DBUG_PRINT("error", ("t2_keysegs=%d, t2_key_alg=%d",
t2_keyinfo[i].keysegs, t2_keyinfo[i].key_alg));
return 1;
}
for (j = t1_keyinfo[i].keysegs; j--;) {
uint8 t1_keysegs_j__type = t1_keysegs[j].type;
/*
Table migration from 4.1 to 5.1. In 5.1 a *TEXT key part is
always HA_KEYTYPE_VARTEXT2. In 4.1 we had only the equivalent of
HA_KEYTYPE_VARTEXT1. Since we treat both the same on MyISAM
level, we can ignore a mismatch between these types.
*/
if ((t1_keysegs[j].flag & HA_BLOB_PART) &&
(t2_keysegs[j].flag & HA_BLOB_PART)) {
if ((t1_keysegs_j__type == HA_KEYTYPE_VARTEXT2) &&
(t2_keysegs[j].type == HA_KEYTYPE_VARTEXT1))
t1_keysegs_j__type = HA_KEYTYPE_VARTEXT1; /* purecov: tested */
else if ((t1_keysegs_j__type == HA_KEYTYPE_VARBINARY2) &&
(t2_keysegs[j].type == HA_KEYTYPE_VARBINARY1))
t1_keysegs_j__type = HA_KEYTYPE_VARBINARY1; /* purecov: inspected */
}
if (t1_keysegs[j].language != t2_keysegs[j].language ||
t1_keysegs_j__type != t2_keysegs[j].type ||
t1_keysegs[j].null_bit != t2_keysegs[j].null_bit ||
t1_keysegs[j].length != t2_keysegs[j].length ||
t1_keysegs[j].start != t2_keysegs[j].start) {
DBUG_PRINT("error", ("Key segment %d (key %d) has different "
"definition",
j, i));
DBUG_PRINT("error", ("t1_type=%d, t1_language=%d, t1_null_bit=%d, "
"t1_length=%d",
t1_keysegs[j].type, t1_keysegs[j].language,
t1_keysegs[j].null_bit, t1_keysegs[j].length));
DBUG_PRINT("error", ("t2_type=%d, t2_language=%d, t2_null_bit=%d, "
"t2_length=%d",
t2_keysegs[j].type, t2_keysegs[j].language,
t2_keysegs[j].null_bit, t2_keysegs[j].length));
return 1;
}
}
}
for (i = 0; i < t1_recs; i++) {
MI_COLUMNDEF *t1_rec = &t1_recinfo[i];
MI_COLUMNDEF *t2_rec = &t2_recinfo[i];
/*
FIELD_SKIP_ZERO can be changed to FIELD_NORMAL in mi_create,
see NOTE1 in mi_create.c
*/
if ((t1_rec->type != t2_rec->type &&
!(t1_rec->type == (int)FIELD_SKIP_ZERO && t1_rec->length == 1 &&
t2_rec->type == (int)FIELD_NORMAL)) ||
t1_rec->length != t2_rec->length ||
t1_rec->null_bit != t2_rec->null_bit) {
DBUG_PRINT("error", ("Field %d has different definition", i));
DBUG_PRINT("error", ("t1_type=%d, t1_length=%d, t1_null_bit=%d",
t1_rec->type, t1_rec->length, t1_rec->null_bit));
DBUG_PRINT("error", ("t2_type=%d, t2_length=%d, t2_null_bit=%d",
t2_rec->type, t2_rec->length, t2_rec->null_bit));
return 1;
}
}
return 0;
}
extern "C" {
volatile int *killed_ptr(MI_CHECK *param) {
/* In theory Unsafe conversion, but should be ok for now */
return (int *)&(((THD *)(param->thd))->killed);
}
void mi_check_print_error(MI_CHECK *param, const char *fmt, ...) {
param->error_printed |= 1;
param->out_flag |= O_DATA_LOST;
va_list args;
va_start(args, fmt);
mi_check_print_msg(param, "error", fmt, args);
va_end(args);
}
void mi_check_print_info(MI_CHECK *param, const char *fmt, ...) {
va_list args;
va_start(args, fmt);
mi_check_print_msg(param, "info", fmt, args);
va_end(args);
}
void mi_check_print_warning(MI_CHECK *param, const char *fmt, ...) {
param->warning_printed = 1;
param->out_flag |= O_DATA_LOST;
va_list args;
va_start(args, fmt);
mi_check_print_msg(param, "warning", fmt, args);
va_end(args);
}
/**
Report list of threads (and queries) accessing a table, thread_id of a
thread that detected corruption, ource file name and line number where
this corruption was detected, optional extra information (string).
This function is intended to be used when table corruption is detected.
@param[in] file MI_INFO object.
@param[in] message Optional error message.
@param[in] sfile Name of source file.
@param[in] sline Line number in source file.
*/
void _mi_report_crashed(MI_INFO *file, const char *message, const char *sfile,
uint sline) {
THD *cur_thd;
LIST *element;
char buf[1024];
mysql_mutex_lock(&file->s->intern_lock);
if ((cur_thd = (THD *)file->in_use.data))
LogErr(ERROR_LEVEL, ER_MYISAM_CRASHED_ERROR_IN_THREAD, cur_thd->thread_id(),
sfile, sline);
else
LogErr(ERROR_LEVEL, ER_MYISAM_CRASHED_ERROR_IN, sfile, sline);
if (message) LogErr(ERROR_LEVEL, ER_MYISAM_CRASHED_ERROR, message);
for (element = file->s->in_use; element; element = list_rest(element)) {
THD *thd = (THD *)element->data;
LogErr(ERROR_LEVEL, ER_MYISAM_CRASHED_ERROR,
thd ? thd_security_context(thd, buf, sizeof(buf), 0)
: "Unknown thread accessing table");
}
mysql_mutex_unlock(&file->s->intern_lock);
}
}
ha_myisam::ha_myisam(handlerton *hton, TABLE_SHARE *table_arg)
: handler(hton, table_arg),
file(nullptr),
int_table_flags(
HA_NULL_IN_KEY | HA_CAN_FULLTEXT | HA_CAN_SQL_HANDLER |
HA_BINLOG_ROW_CAPABLE | HA_BINLOG_STMT_CAPABLE | HA_DUPLICATE_POS |
HA_CAN_INDEX_BLOBS | HA_AUTO_PART_KEY | HA_FILE_BASED |
HA_CAN_GEOMETRY | HA_NO_TRANSACTIONS | HA_CAN_BIT_FIELD |
HA_CAN_RTREEKEYS | HA_COUNT_ROWS_INSTANT | HA_STATS_RECORDS_IS_EXACT |
HA_CAN_REPAIR | HA_GENERATED_COLUMNS | HA_ATTACHABLE_TRX_COMPATIBLE |
HA_SUPPORTS_DEFAULT_EXPRESSION),
can_enable_indexes(true),
ds_mrr(this) {}
handler *ha_myisam::clone(const char *name, MEM_ROOT *mem_root) {
ha_myisam *new_handler =
static_cast<ha_myisam *>(handler::clone(name, mem_root));
if (new_handler) new_handler->file->state = file->state;
return new_handler;
}
static const char *ha_myisam_exts[] = {".MYI", ".MYD", NullS};
/**
@brief Check if the given db.tablename is a system table for this SE.
@param db database name.
@param table_name table name to check.
@param is_sql_layer_system_table if the supplied db.table_name is a SQL
layer system table.
@note As for 8.0, MySQL doesn't support MyISAM as an engine for the system
tables. Altering engine of system table to MyISAM is not allowed.
Creating system tables in MyISAM is allowed to upgrade from older
versions through mysqldump.
@note In case there is a need to define MYISAM specific system database, then
please see reference implementation in ha_example.cc.
@retval true Given db.table_name is supported system table.
@retval false Given db.table_name is not a supported system table.
*/
static bool myisam_is_supported_system_table(const char *db,
const char *table_name,
bool is_sql_layer_system_table) {
/*
Currently MYISAM does not support any other SE specific system tables. If
in future it does, please see ha_example.cc for reference implementation
*/
if (!is_sql_layer_system_table) return false;
/*
During upgrade, server side execution of SQL statement is allowed to use
this SE for system tables.
*/
THD *thd = current_thd;
if (thd->is_server_upgrade_thread()) return true;
/*
For client side SQL, creating system tables in this SE is allowed to support
logical upgrade.
*/
if (thd->lex->sql_command == SQLCOM_CREATE_TABLE) {
push_warning_printf(thd, Sql_condition::SL_WARNING, ER_UNSUPPORTED_ENGINE,
ER_THD(thd, ER_UNSUPPORTED_ENGINE), "MyISAM", db,
table_name);
return true;
}
// Any other usage is not allowed.
return false;
}
/* Name is here without an extension */
int ha_myisam::open(const char *name, int mode, uint test_if_locked,
const dd::Table *) {
MI_KEYDEF *keyinfo;
MI_COLUMNDEF *recinfo = nullptr;
Myisam_handler_share *my_handler_share;
MYISAM_SHARE *share = nullptr;
uint recs;
uint i;
/*
We are allocating the handler share only in case of normal MyISAM tables
*/
if (table->s->tmp_table == NO_TMP_TABLE) {
lock_shared_ha_data();
my_handler_share = static_cast<Myisam_handler_share *>(get_ha_share_ptr());
if (my_handler_share) share = my_handler_share->m_share;
if (!(file = mi_open_share(name, share, mode,
test_if_locked | HA_OPEN_FROM_SQL_LAYER))) {
unlock_shared_ha_data();
return (my_errno() ? my_errno() : -1);
}
if (!my_handler_share) {
my_handler_share = new (std::nothrow) Myisam_handler_share;
if (my_handler_share) {
my_handler_share->m_share = file->s;
set_ha_share_ptr(static_cast<Handler_share *>(my_handler_share));
} else {
mi_close(file);
unlock_shared_ha_data();
return (my_errno() ? my_errno() : HA_ERR_OUT_OF_MEM);
}
}
unlock_shared_ha_data();
} else if (!(file = mi_open_share(name, share, mode,
test_if_locked | HA_OPEN_FROM_SQL_LAYER)))
return (my_errno() ? my_errno() : -1);
if (!table->s->tmp_table) /* No need to perform a check for tmp table */
{
/*
If the data dictionary and SQL-layer have outdated information
about whether table is compressed or not, ask them to retrieve
correct row format from the storage engine and store it in DD.
*/
if ((table->s->real_row_type != ROW_TYPE_COMPRESSED) !=
!(file->s->options & HA_OPTION_COMPRESS_RECORD)) {
table->s->db_options_in_use = file->s->options;
set_my_errno(HA_ERR_ROW_FORMAT_CHANGED);
goto err;
}
set_my_errno(table2myisam(table, &keyinfo, &recinfo, &recs));
if (my_errno()) {
/* purecov: begin inspected */
DBUG_PRINT("error", ("Failed to convert TABLE object to MyISAM "
"key and column definition"));
goto err;
/* purecov: end */
}
if (check_definition(keyinfo, recinfo, table->s->keys, recs,
file->s->keyinfo, file->s->rec, file->s->base.keys,
file->s->base.fields, true)) {
/* purecov: begin inspected */
set_my_errno(HA_ERR_CRASHED);
goto err;
/* purecov: end */
}
}
if (test_if_locked & (HA_OPEN_IGNORE_IF_LOCKED | HA_OPEN_TMP_TABLE))
(void)mi_extra(file, HA_EXTRA_NO_WAIT_LOCK, nullptr);
info(HA_STATUS_NO_LOCK | HA_STATUS_VARIABLE | HA_STATUS_CONST);
if (!(test_if_locked & HA_OPEN_WAIT_IF_LOCKED))
(void)mi_extra(file, HA_EXTRA_WAIT_LOCK, nullptr);
if (file->s->options & (HA_OPTION_CHECKSUM | HA_OPTION_COMPRESS_RECORD))
int_table_flags |= HA_HAS_CHECKSUM;
for (i = 0; i < table->s->keys; i++) {
plugin_ref parser = table->key_info[i].parser;
if (table->key_info[i].flags & HA_USES_PARSER)
file->s->keyinfo[i].parser =
(struct st_mysql_ftparser *)plugin_decl(parser)->info;
table->key_info[i].block_size = file->s->keyinfo[i].block_length;
}
set_my_errno(0);
goto end;
err:
this->close();
end:
/*
Both recinfo and keydef are allocated by my_multi_malloc(), thus only
recinfo must be freed.
*/
if (recinfo) my_free(recinfo);
return my_errno();
}
int ha_myisam::close(void) {
bool closed_share = false;
lock_shared_ha_data();
int err = mi_close_share(file, &closed_share);
file = nullptr;
/*
Since tmp tables will also come to the same flow. To distinguesh with them
we need to check table_share->tmp_table.
*/
if (closed_share && table_share->tmp_table == NO_TMP_TABLE) {
Myisam_handler_share *my_handler_share =
static_cast<Myisam_handler_share *>(get_ha_share_ptr());
if (my_handler_share && my_handler_share->m_share)
delete (my_handler_share);
set_ha_share_ptr(nullptr);
}
unlock_shared_ha_data();
return err;
}
int ha_myisam::write_row(uchar *buf) {
ha_statistic_increment(&System_status_var::ha_write_count);
/*
If we have an auto_increment column and we are writing a changed row
or a new row, then update the auto_increment value in the record.
*/
if (table && table->next_number_field && buf == table->record[0]) {
int error;
if ((error = update_auto_increment())) return error;
}
return mi_write(file, buf);
}
int ha_myisam::check(THD *thd, HA_CHECK_OPT *check_opt) {
if (!file) return HA_ADMIN_INTERNAL_ERROR;
int error;
MI_CHECK param;
MYISAM_SHARE *share = file->s;
const char *old_proc_info = thd->proc_info();
thd_proc_info(thd, "Checking table");
myisamchk_init(¶m);
param.thd = thd;
param.op_name = "check";
param.db_name = table->s->db.str;
param.table_name = table->alias;
param.testflag = check_opt->flags | T_CHECK | T_SILENT;
param.stats_method = (enum_mi_stats_method)THDVAR(thd, stats_method);
if (!(table->db_stat & HA_READ_ONLY)) param.testflag |= T_STATISTICS;
param.using_global_keycache = true;
if (!mi_is_crashed(file) &&
(((param.testflag & T_CHECK_ONLY_CHANGED) &&
!(share->state.changed &
(STATE_CHANGED | STATE_CRASHED | STATE_CRASHED_ON_REPAIR)) &&
share->state.open_count == 0) ||
((param.testflag & T_FAST) &&
(share->state.open_count == (uint)(share->global_changed ? 1 : 0)))))
return HA_ADMIN_ALREADY_DONE;
error = chk_status(¶m, file); // Not fatal
error = chk_size(¶m, file);
if (!error) error |= chk_del(¶m, file, param.testflag);
if (!error) error = chk_key(¶m, file);
if (!error) {
if ((!(param.testflag & T_QUICK) &&
((share->options &
(HA_OPTION_PACK_RECORD | HA_OPTION_COMPRESS_RECORD)) ||
(param.testflag & (T_EXTEND | T_MEDIUM)))) ||
mi_is_crashed(file)) {
uint old_testflag = param.testflag;
param.testflag |= T_MEDIUM;
if (!(error = init_io_cache(
¶m.read_cache, file->dfile, my_default_record_cache_size,
READ_CACHE, share->pack.header_length, true, MYF(MY_WME)))) {
error = chk_data_link(¶m, file, param.testflag & T_EXTEND);
end_io_cache(&(param.read_cache));
}
param.testflag = old_testflag;
}
}
if (!error) {
if ((share->state.changed & (STATE_CHANGED | STATE_CRASHED_ON_REPAIR |
STATE_CRASHED | STATE_NOT_ANALYZED)) ||
(param.testflag & T_STATISTICS) || mi_is_crashed(file)) {
file->update |= HA_STATE_CHANGED | HA_STATE_ROW_CHANGED;
mysql_mutex_lock(&share->intern_lock);
share->state.changed &=
~(STATE_CHANGED | STATE_CRASHED | STATE_CRASHED_ON_REPAIR);
if (!(table->db_stat & HA_READ_ONLY))
error = update_state_info(
¶m, file, UPDATE_TIME | UPDATE_OPEN_COUNT | UPDATE_STAT);
mysql_mutex_unlock(&share->intern_lock);
info(HA_STATUS_NO_LOCK | HA_STATUS_TIME | HA_STATUS_VARIABLE |
HA_STATUS_CONST);
}
} else if (!mi_is_crashed(file) && !thd->killed) {
mi_mark_crashed(file);
file->update |= HA_STATE_CHANGED | HA_STATE_ROW_CHANGED;
}
thd_proc_info(thd, old_proc_info);
return error ? HA_ADMIN_CORRUPT : HA_ADMIN_OK;
}
/*
analyze the key distribution in the table
As the table may be only locked for read, we have to take into account that
two threads may do an analyze at the same time!
*/
int ha_myisam::analyze(THD *thd, HA_CHECK_OPT *) {
int error = 0;
MI_CHECK param;
MYISAM_SHARE *share = file->s;
myisamchk_init(¶m);
param.thd = thd;
param.op_name = "analyze";
param.db_name = table->s->db.str;
param.table_name = table->alias;
param.testflag =
(T_FAST | T_CHECK | T_SILENT | T_STATISTICS | T_DONT_CHECK_CHECKSUM);
param.using_global_keycache = true;
param.stats_method = (enum_mi_stats_method)THDVAR(thd, stats_method);
if (!(share->state.changed & STATE_NOT_ANALYZED))
return HA_ADMIN_ALREADY_DONE;
error = chk_key(¶m, file);
if (!error) {
mysql_mutex_lock(&share->intern_lock);
error = update_state_info(¶m, file, UPDATE_STAT);
mysql_mutex_unlock(&share->intern_lock);
} else if (!mi_is_crashed(file) && !thd->killed)
mi_mark_crashed(file);
return error ? HA_ADMIN_CORRUPT : HA_ADMIN_OK;
}
int ha_myisam::repair(THD *thd, HA_CHECK_OPT *check_opt) {
int error;
MI_CHECK param;
ha_rows start_records;
if (!file) return HA_ADMIN_INTERNAL_ERROR;
myisamchk_init(¶m);
param.thd = thd;
param.op_name = "repair";
param.testflag =
((check_opt->flags & ~(T_EXTEND)) | T_SILENT | T_FORCE_CREATE |
T_CALC_CHECKSUM | (check_opt->flags & T_EXTEND ? T_REP : T_REP_BY_SORT));
param.sort_buffer_length = THDVAR(thd, sort_buffer_size);
start_records = file->state->records;
while ((error = repair(thd, param, false)) && param.retry_repair) {
param.retry_repair = false;
if (test_all_bits(param.testflag,
(uint)(T_RETRY_WITHOUT_QUICK | T_QUICK))) {
param.testflag &= ~T_RETRY_WITHOUT_QUICK;
LogErr(INFORMATION_LEVEL, ER_RETRYING_REPAIR_WITHOUT_QUICK,
table->s->path.str);
continue;
}
param.testflag &= ~T_QUICK;
if ((param.testflag & T_REP_BY_SORT)) {
param.testflag = (param.testflag & ~T_REP_BY_SORT) | T_REP;
LogErr(INFORMATION_LEVEL, ER_RETRYING_REPAIR_WITH_KEYCACHE,
table->s->path.str);
continue;
}
break;
}
if (!error && start_records != file->state->records &&
!(check_opt->flags & T_VERY_SILENT)) {
char llbuff[22], llbuff2[22];
LogErr(INFORMATION_LEVEL, ER_FOUND_ROWS_WHILE_REPAIRING,
llstr(file->state->records, llbuff), llstr(start_records, llbuff2),
table->s->path.str);
}
return error;
}
int ha_myisam::optimize(THD *thd, HA_CHECK_OPT *check_opt) {
int error;
if (!file) return HA_ADMIN_INTERNAL_ERROR;
MI_CHECK param;
myisamchk_init(¶m);
param.thd = thd;
param.op_name = "optimize";
param.testflag = (check_opt->flags | T_SILENT | T_FORCE_CREATE |
T_REP_BY_SORT | T_STATISTICS | T_SORT_INDEX);
param.sort_buffer_length = THDVAR(thd, sort_buffer_size);
if ((error = repair(thd, param, true)) && param.retry_repair) {
LogErr(WARNING_LEVEL, ER_ERROR_DURING_OPTIMIZE_TABLE, my_errno(),
param.db_name, param.table_name);
param.testflag &= ~T_REP_BY_SORT;
error = repair(thd, param, true);
}