/*****************************************************************************
Copyright ( c ) 1996 , 2017 , Oracle and / or its affiliates . All Rights Reserved .
Copyright ( c ) 2016 , 2023 , MariaDB Corporation .
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
*****************************************************************************/
/**************************************************//**
@file dict/dict0boot.cc
Data dictionary creation and booting
Created 4 /18 /1996 Heikki Tuuri
*******************************************************/
#include "dict0boot.h"
#include "dict0crea.h"
#include "btr0btr.h"
#include "dict0load.h"
#include "trx0trx.h"
#include "srv0srv.h"
#include "buf0flu.h"
#include "log0recv.h"
#include "os0file.h"
/** The DICT_HDR page identifier */
static constexpr page_id_t hdr_page_id{DICT_HDR_SPACE, DICT_HDR_PAGE_NO};
/** @return the DICT_HDR block, x-latched */
static buf_block_t *dict_hdr_get(mtr_t *mtr)
{
/* We assume that the DICT_HDR page is always readable and available. */
buf_block_t *b=
buf_page_get_gen(hdr_page_id, 0 , RW_X_LATCH, nullptr, BUF_GET, mtr);
buf_page_make_young_if_needed(&b->page);
return b;
}
/**********************************************************************//**
Returns a new table, index, or space id. */
void
dict_hdr_get_new_id(
/*================*/
trx_t* trx, /*!< in/out: transaction */
table_id_t* table_id, /*!< out: table id
(not assigned if NULL) */
index_id_t* index_id, /*!< out: index id
(not assigned if NULL) */
uint32_t* space_id) /*!< out: space id
(not assigned if NULL) */
{
ib_id_t id;
mtr_t mtr{trx};
mtr.start();
buf_block_t* dict_hdr = dict_hdr_get(&mtr);
if (table_id) {
id = mach_read_from_8(DICT_HDR + DICT_HDR_TABLE_ID
+ dict_hdr->page.frame);
id++;
mtr.write<8 >(*dict_hdr, DICT_HDR + DICT_HDR_TABLE_ID
+ dict_hdr->page.frame, id);
*table_id = id;
}
if (index_id) {
id = mach_read_from_8(DICT_HDR + DICT_HDR_INDEX_ID
+ dict_hdr->page.frame);
id++;
mtr.write<8 >(*dict_hdr, DICT_HDR + DICT_HDR_INDEX_ID
+ dict_hdr->page.frame, id);
*index_id = id;
}
if (space_id) {
*space_id = mach_read_from_4(DICT_HDR + DICT_HDR_MAX_SPACE_ID
+ dict_hdr->page.frame);
if (fil_assign_new_space_id(space_id)) {
mtr.write<4 >(*dict_hdr,
DICT_HDR + DICT_HDR_MAX_SPACE_ID
+ dict_hdr->page.frame, *space_id);
}
}
mtr.commit();
}
/** Create the DICT_HDR page on database initialization.
@return error code */
dberr_t dict_create()
{
ulint root_page_no;
dberr_t err;
mtr_t mtr{nullptr};
mtr.start();
compile_time_assert(DICT_HDR_SPACE == 0 );
/* Create the dictionary header file block in a new, allocated file
segment in the system tablespace */
buf_block_t* d = fseg_create(fil_system.sys_space,
DICT_HDR + DICT_HDR_FSEG_HEADER, &mtr,
&err);
if (!d) {
goto func_exit;
}
ut_a(d->page.id() == hdr_page_id);
/* Start counting table, index, and tree ids from
DICT_HDR_FIRST_ID */
mtr.write<8 >(*d, DICT_HDR + DICT_HDR_TABLE_ID + d->page.frame,
DICT_HDR_FIRST_ID);
mtr.write<8 >(*d, DICT_HDR + DICT_HDR_INDEX_ID + d->page.frame,
DICT_HDR_FIRST_ID);
ut_ad(!mach_read_from_4(DICT_HDR + DICT_HDR_MAX_SPACE_ID
+ d->page.frame));
/* Obsolete, but we must initialize it anyway. */
mtr.write<4 >(*d, DICT_HDR + DICT_HDR_MIX_ID_LOW + d->page.frame,
DICT_HDR_FIRST_ID);
/* Create the B-tree roots for the clustered indexes of the basic
system tables */
/*--------------------------*/
root_page_no = btr_create(DICT_CLUSTERED | DICT_UNIQUE,
fil_system.sys_space, DICT_TABLES_ID,
nullptr, &mtr, &err);
if (root_page_no == FIL_NULL) {
goto func_exit;
}
mtr.write<4 >(*d, DICT_HDR + DICT_HDR_TABLES + d->page.frame,
root_page_no);
/*--------------------------*/
root_page_no = btr_create(DICT_UNIQUE,
fil_system.sys_space, DICT_TABLE_IDS_ID,
nullptr, &mtr, &err);
if (root_page_no == FIL_NULL) {
goto func_exit;
}
mtr.write<4 >(*d, DICT_HDR + DICT_HDR_TABLE_IDS + d->page.frame,
root_page_no);
/*--------------------------*/
root_page_no = btr_create(DICT_CLUSTERED | DICT_UNIQUE,
fil_system.sys_space, DICT_COLUMNS_ID,
nullptr, &mtr, &err);
if (root_page_no == FIL_NULL) {
goto func_exit;
}
mtr.write<4 >(*d, DICT_HDR + DICT_HDR_COLUMNS + d->page.frame,
root_page_no);
/*--------------------------*/
root_page_no = btr_create(DICT_CLUSTERED | DICT_UNIQUE,
fil_system.sys_space, DICT_INDEXES_ID,
nullptr, &mtr, &err);
if (root_page_no == FIL_NULL) {
goto func_exit;
}
mtr.write<4 >(*d, DICT_HDR + DICT_HDR_INDEXES + d->page.frame,
root_page_no);
/*--------------------------*/
root_page_no = btr_create(DICT_CLUSTERED | DICT_UNIQUE,
fil_system.sys_space, DICT_FIELDS_ID,
nullptr, &mtr, &err);
if (root_page_no == FIL_NULL) {
goto func_exit;
}
mtr.write<4 >(*d, DICT_HDR + DICT_HDR_FIELDS + d->page.frame,
root_page_no);
func_exit:
mtr.commit();
return err ? err : dict_boot();
}
/*****************************************************************//**
Initializes the data dictionary memory structures when the database is
started. This function is also called when the data dictionary is created.
@return DB_SUCCESS or error code. */
dberr_t dict_boot()
{
dict_table_t* table;
dict_index_t* index;
mem_heap_t* heap;
mtr_t mtr{nullptr};
static_assert(DICT_NUM_COLS__SYS_TABLES == 8 , "compatibility" );
static_assert(DICT_NUM_FIELDS__SYS_TABLES == 10 , "compatibility" );
static_assert(DICT_NUM_FIELDS__SYS_TABLE_IDS == 2 , "compatibility" );
static_assert(DICT_NUM_COLS__SYS_COLUMNS == 7 , "compatibility" );
static_assert(DICT_NUM_FIELDS__SYS_COLUMNS == 9 , "compatibility" );
static_assert(DICT_NUM_COLS__SYS_INDEXES == 8 , "compatibility" );
static_assert(DICT_NUM_FIELDS__SYS_INDEXES == 10 , "compatibility" );
static_assert(DICT_NUM_COLS__SYS_FIELDS == 3 , "compatibility" );
static_assert(DICT_NUM_FIELDS__SYS_FIELDS == 5 , "compatibility" );
static_assert(DICT_NUM_COLS__SYS_FOREIGN == 4 , "compatibility" );
static_assert(DICT_NUM_FIELDS__SYS_FOREIGN == 6 , "compatibility" );
static_assert(DICT_NUM_FIELDS__SYS_FOREIGN_FOR_NAME == 2 ,
"compatibility" );
static_assert(DICT_NUM_COLS__SYS_FOREIGN_COLS == 4 , "compatibility" );
static_assert(DICT_NUM_FIELDS__SYS_FOREIGN_COLS == 6 , "compatibility" );
mtr.start();
/* Create the hash tables etc. */
dict_sys.create();
dberr_t err;
const buf_block_t *d = recv_sys.recover(hdr_page_id, &mtr ,&err);
DBUG_EXECUTE_IF("hdr_page_corrupt" ,
err= DB_CORRUPTION;
d= nullptr;);
if (!d) {
mtr.commit();
return err;
}
heap = mem_heap_create(450 );
dict_sys.lock(SRW_LOCK_CALL);
const byte* dict_hdr = &d->page.frame[DICT_HDR];
if (uint32_t max_space_id
= mach_read_from_4(dict_hdr + DICT_HDR_MAX_SPACE_ID)) {
max_space_id--;
fil_assign_new_space_id(&max_space_id);
}
/* Insert into the dictionary cache the descriptions of the basic
system tables */
/*-------------------------*/
table = dict_table_t::create(dict_sys.SYS_TABLE[dict_sys.SYS_TABLES],
fil_system.sys_space,
DICT_NUM_COLS__SYS_TABLES, 0 , 0 , 0 );
dict_mem_table_add_col(table, heap, "NAME" , DATA_BINARY, 0 ,
MAX_FULL_NAME_LEN);
dict_mem_table_add_col(table, heap, "ID" , DATA_BINARY, 0 , 8 );
/* ROW_FORMAT = (N_COLS >> 31) ? COMPACT : REDUNDANT */
dict_mem_table_add_col(table, heap, "N_COLS" , DATA_INT, 0 , 4 );
/* The low order bit of TYPE is always set to 1. If ROW_FORMAT
is not REDUNDANT or COMPACT, this field matches table->flags. */
dict_mem_table_add_col(table, heap, "TYPE" , DATA_INT, 0 , 4 );
dict_mem_table_add_col(table, heap, "MIX_ID" , DATA_BINARY, 0 , 0 );
/* MIX_LEN may contain additional table flags when
ROW_FORMAT!=REDUNDANT. */
dict_mem_table_add_col(table, heap, "MIX_LEN" , DATA_INT, 0 , 4 );
dict_mem_table_add_col(table, heap, "CLUSTER_NAME" , DATA_BINARY, 0 , 0 );
dict_mem_table_add_col(table, heap, "SPACE" , DATA_INT, 0 , 4 );
table->id = DICT_TABLES_ID;
dict_table_add_system_columns(table, heap);
table->add_to_cache();
dict_sys.sys_tables = table;
mem_heap_empty(heap);
index = dict_mem_index_create(table, "CLUST_IND" ,
DICT_UNIQUE | DICT_CLUSTERED, 1 );
dict_mem_index_add_field(index, "NAME" , 0 );
index->id = DICT_TABLES_ID;
err = dict_index_add_to_cache(
index, mach_read_from_4(dict_hdr + DICT_HDR_TABLES));
ut_a(err == DB_SUCCESS);
ut_ad(!table->is_instant());
table->indexes.start->n_core_null_bytes = static_cast <uint8_t>(
UT_BITS_IN_BYTES(unsigned (table->indexes.start->n_nullable)));
/*-------------------------*/
index = dict_mem_index_create(table, "ID_IND" , DICT_UNIQUE, 1 );
dict_mem_index_add_field(index, "ID" , 0 );
index->id = DICT_TABLE_IDS_ID;
err = dict_index_add_to_cache(
index, mach_read_from_4(dict_hdr + DICT_HDR_TABLE_IDS));
ut_a(err == DB_SUCCESS);
/*-------------------------*/
table = dict_table_t::create(dict_sys.SYS_TABLE[dict_sys.SYS_COLUMNS],
fil_system.sys_space,
DICT_NUM_COLS__SYS_COLUMNS, 0 , 0 , 0 );
dict_mem_table_add_col(table, heap, "TABLE_ID" , DATA_BINARY, 0 , 8 );
dict_mem_table_add_col(table, heap, "POS" , DATA_INT, 0 , 4 );
dict_mem_table_add_col(table, heap, "NAME" , DATA_BINARY, 0 , 0 );
dict_mem_table_add_col(table, heap, "MTYPE" , DATA_INT, 0 , 4 );
dict_mem_table_add_col(table, heap, "PRTYPE" , DATA_INT, 0 , 4 );
dict_mem_table_add_col(table, heap, "LEN" , DATA_INT, 0 , 4 );
dict_mem_table_add_col(table, heap, "PREC" , DATA_INT, 0 , 4 );
table->id = DICT_COLUMNS_ID;
dict_table_add_system_columns(table, heap);
table->add_to_cache();
dict_sys.sys_columns = table;
mem_heap_empty(heap);
index = dict_mem_index_create(table, "CLUST_IND" ,
DICT_UNIQUE | DICT_CLUSTERED, 2 );
dict_mem_index_add_field(index, "TABLE_ID" , 0 );
dict_mem_index_add_field(index, "POS" , 0 );
index->id = DICT_COLUMNS_ID;
err = dict_index_add_to_cache(
index, mach_read_from_4(dict_hdr + DICT_HDR_COLUMNS));
ut_a(err == DB_SUCCESS);
ut_ad(!table->is_instant());
table->indexes.start->n_core_null_bytes = static_cast <uint8_t>(
UT_BITS_IN_BYTES(unsigned (table->indexes.start->n_nullable)));
/*-------------------------*/
table = dict_table_t::create(dict_sys.SYS_TABLE[dict_sys.SYS_INDEXES],
fil_system.sys_space,
DICT_NUM_COLS__SYS_INDEXES, 0 , 0 , 0 );
dict_mem_table_add_col(table, heap, "TABLE_ID" , DATA_BINARY, 0 , 8 );
dict_mem_table_add_col(table, heap, "ID" , DATA_BINARY, 0 , 8 );
dict_mem_table_add_col(table, heap, "NAME" , DATA_BINARY, 0 , 0 );
dict_mem_table_add_col(table, heap, "N_FIELDS" , DATA_INT, 0 , 4 );
dict_mem_table_add_col(table, heap, "TYPE" , DATA_INT, 0 , 4 );
/* SYS_INDEXES.SPACE is only read by in dict_drop_index_tree() */
dict_mem_table_add_col(table, heap, "SPACE" , DATA_INT, 0 , 4 );
dict_mem_table_add_col(table, heap, "PAGE_NO" , DATA_INT, 0 , 4 );
dict_mem_table_add_col(table, heap, "MERGE_THRESHOLD" , DATA_INT, 0 , 4 );
table->id = DICT_INDEXES_ID;
dict_table_add_system_columns(table, heap);
/* The column SYS_INDEXES.MERGE_THRESHOLD was "instantly"
added in MySQL 5 . 7 and MariaDB 10 . 2 . 2 . Assign it DEFAULT NULL .
Because of file format compatibility , we must treat SYS_INDEXES
as a special case , relaxing some debug assertions
for DICT_INDEXES_ID. */
dict_table_get_nth_col(table, DICT_COL__SYS_INDEXES__MERGE_THRESHOLD)
->def_val.len = UNIV_SQL_NULL;
table->add_to_cache();
dict_sys.sys_indexes = table;
mem_heap_empty(heap);
index = dict_mem_index_create(table, "CLUST_IND" ,
DICT_UNIQUE | DICT_CLUSTERED, 2 );
dict_mem_index_add_field(index, "TABLE_ID" , 0 );
dict_mem_index_add_field(index, "ID" , 0 );
index->id = DICT_INDEXES_ID;
err = dict_index_add_to_cache(
index, mach_read_from_4(dict_hdr + DICT_HDR_INDEXES));
ut_a(err == DB_SUCCESS);
ut_ad(!table->is_instant());
table->indexes.start->n_core_null_bytes = static_cast <uint8_t>(
UT_BITS_IN_BYTES(unsigned (table->indexes.start->n_nullable)));
/*-------------------------*/
table = dict_table_t::create(dict_sys.SYS_TABLE[dict_sys.SYS_FIELDS],
fil_system.sys_space,
DICT_NUM_COLS__SYS_FIELDS, 0 , 0 , 0 );
dict_mem_table_add_col(table, heap, "INDEX_ID" , DATA_BINARY, 0 , 8 );
dict_mem_table_add_col(table, heap, "POS" , DATA_INT, 0 , 4 );
dict_mem_table_add_col(table, heap, "COL_NAME" , DATA_BINARY, 0 , 0 );
table->id = DICT_FIELDS_ID;
dict_table_add_system_columns(table, heap);
table->add_to_cache();
dict_sys.sys_fields = table;
mem_heap_free(heap);
index = dict_mem_index_create(table, "CLUST_IND" ,
DICT_UNIQUE | DICT_CLUSTERED, 2 );
dict_mem_index_add_field(index, "INDEX_ID" , 0 );
dict_mem_index_add_field(index, "POS" , 0 );
index->id = DICT_FIELDS_ID;
err = dict_index_add_to_cache(
index, mach_read_from_4(dict_hdr + DICT_HDR_FIELDS));
ut_a(err == DB_SUCCESS);
ut_ad(!table->is_instant());
table->indexes.start->n_core_null_bytes = static_cast <uint8_t>(
UT_BITS_IN_BYTES(unsigned (table->indexes.start->n_nullable)));
mtr.commit();
dict_sys.unlock();
return err;
}
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