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mariadb/dict/dict0boot.c
marko e106d9d5ac branches/zip: When dropping temporary indexes and tables at startup, 
first load them to the data dictionary cache and use the normal
routines for dropping tables or indexes.  This should reduce the
risk of bugs and also make the code compatible with the upcoming
TablespaceDictionary implementation.

DICT_SYS_INDEXES_NAME_FIELD: The clustered index position of SYS_INDEXES.NAME.

row_merge_drop_temp_indexes(): Scan SYS_INDEXES for tables containing
temporary indexes, and load the tables as needed. Invoke
row_merge_drop_index() to drop the indexes.

row_mysql_drop_temp_tables(): Scan SYS_TABLES for temporary tables,
load them with dict_load_table() and drop them with
row_drop_table_for_mysql().

rb://251, not yet reviewed
2010-02-09 11:53:59 +00:00

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/*****************************************************************************
Copyright (c) 1996, 2009, Innobase Oy. All Rights Reserved.
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., 59 Temple
Place, Suite 330, Boston, MA 02111-1307 USA
*****************************************************************************/
/**************************************************//**
@file dict/dict0boot.c
Data dictionary creation and booting
Created 4/18/1996 Heikki Tuuri
*******************************************************/
#include "dict0boot.h"
#ifdef UNIV_NONINL
#include "dict0boot.ic"
#endif
#include "dict0crea.h"
#include "btr0btr.h"
#include "dict0load.h"
#include "dict0load.h"
#include "trx0trx.h"
#include "srv0srv.h"
#include "ibuf0ibuf.h"
#include "buf0flu.h"
#include "log0recv.h"
#include "os0file.h"
/**********************************************************************//**
Gets a pointer to the dictionary header and x-latches its page.
@return pointer to the dictionary header, page x-latched */
UNIV_INTERN
dict_hdr_t*
dict_hdr_get(
/*=========*/
mtr_t* mtr) /*!< in: mtr */
{
buf_block_t* block;
dict_hdr_t* header;
block = buf_page_get(DICT_HDR_SPACE, 0, DICT_HDR_PAGE_NO,
RW_X_LATCH, mtr);
header = DICT_HDR + buf_block_get_frame(block);
buf_block_dbg_add_level(block, SYNC_DICT_HEADER);
return(header);
}
/**********************************************************************//**
Returns a new table, index, or tree id.
@return the new id */
UNIV_INTERN
dulint
dict_hdr_get_new_id(
/*================*/
ulint type) /*!< in: DICT_HDR_ROW_ID, ... */
{
dict_hdr_t* dict_hdr;
dulint id;
mtr_t mtr;
ut_ad((type == DICT_HDR_TABLE_ID) || (type == DICT_HDR_INDEX_ID));
mtr_start(&mtr);
dict_hdr = dict_hdr_get(&mtr);
id = mtr_read_dulint(dict_hdr + type, &mtr);
id = ut_dulint_add(id, 1);
mlog_write_dulint(dict_hdr + type, id, &mtr);
mtr_commit(&mtr);
return(id);
}
/**********************************************************************//**
Writes the current value of the row id counter to the dictionary header file
page. */
UNIV_INTERN
void
dict_hdr_flush_row_id(void)
/*=======================*/
{
dict_hdr_t* dict_hdr;
dulint id;
mtr_t mtr;
ut_ad(mutex_own(&(dict_sys->mutex)));
id = dict_sys->row_id;
mtr_start(&mtr);
dict_hdr = dict_hdr_get(&mtr);
mlog_write_dulint(dict_hdr + DICT_HDR_ROW_ID, id, &mtr);
mtr_commit(&mtr);
}
/*****************************************************************//**
Creates the file page for the dictionary header. This function is
called only at the database creation.
@return TRUE if succeed */
static
ibool
dict_hdr_create(
/*============*/
mtr_t* mtr) /*!< in: mtr */
{
buf_block_t* block;
dict_hdr_t* dict_header;
ulint root_page_no;
ut_ad(mtr);
/* Create the dictionary header file block in a new, allocated file
segment in the system tablespace */
block = fseg_create(DICT_HDR_SPACE, 0,
DICT_HDR + DICT_HDR_FSEG_HEADER, mtr);
ut_a(DICT_HDR_PAGE_NO == buf_block_get_page_no(block));
dict_header = dict_hdr_get(mtr);
/* Start counting row, table, index, and tree ids from
DICT_HDR_FIRST_ID */
mlog_write_dulint(dict_header + DICT_HDR_ROW_ID,
ut_dulint_create(0, DICT_HDR_FIRST_ID), mtr);
mlog_write_dulint(dict_header + DICT_HDR_TABLE_ID,
ut_dulint_create(0, DICT_HDR_FIRST_ID), mtr);
mlog_write_dulint(dict_header + DICT_HDR_INDEX_ID,
ut_dulint_create(0, DICT_HDR_FIRST_ID), mtr);
/* Obsolete, but we must initialize it to 0 anyway. */
mlog_write_dulint(dict_header + DICT_HDR_MIX_ID,
ut_dulint_create(0, DICT_HDR_FIRST_ID), mtr);
/* Create the B-tree roots for the clustered indexes of the basic
system tables */
/*--------------------------*/
root_page_no = btr_create(DICT_CLUSTERED | DICT_UNIQUE,
DICT_HDR_SPACE, 0, DICT_TABLES_ID,
dict_ind_redundant, mtr);
if (root_page_no == FIL_NULL) {
return(FALSE);
}
mlog_write_ulint(dict_header + DICT_HDR_TABLES, root_page_no,
MLOG_4BYTES, mtr);
/*--------------------------*/
root_page_no = btr_create(DICT_UNIQUE, DICT_HDR_SPACE, 0,
DICT_TABLE_IDS_ID,
dict_ind_redundant, mtr);
if (root_page_no == FIL_NULL) {
return(FALSE);
}
mlog_write_ulint(dict_header + DICT_HDR_TABLE_IDS, root_page_no,
MLOG_4BYTES, mtr);
/*--------------------------*/
root_page_no = btr_create(DICT_CLUSTERED | DICT_UNIQUE,
DICT_HDR_SPACE, 0, DICT_COLUMNS_ID,
dict_ind_redundant, mtr);
if (root_page_no == FIL_NULL) {
return(FALSE);
}
mlog_write_ulint(dict_header + DICT_HDR_COLUMNS, root_page_no,
MLOG_4BYTES, mtr);
/*--------------------------*/
root_page_no = btr_create(DICT_CLUSTERED | DICT_UNIQUE,
DICT_HDR_SPACE, 0, DICT_INDEXES_ID,
dict_ind_redundant, mtr);
if (root_page_no == FIL_NULL) {
return(FALSE);
}
mlog_write_ulint(dict_header + DICT_HDR_INDEXES, root_page_no,
MLOG_4BYTES, mtr);
/*--------------------------*/
root_page_no = btr_create(DICT_CLUSTERED | DICT_UNIQUE,
DICT_HDR_SPACE, 0, DICT_FIELDS_ID,
dict_ind_redundant, mtr);
if (root_page_no == FIL_NULL) {
return(FALSE);
}
mlog_write_ulint(dict_header + DICT_HDR_FIELDS, root_page_no,
MLOG_4BYTES, mtr);
/*--------------------------*/
return(TRUE);
}
/*****************************************************************//**
Initializes the data dictionary memory structures when the database is
started. This function is also called when the data dictionary is created. */
UNIV_INTERN
void
dict_boot(void)
/*===========*/
{
dict_table_t* table;
dict_index_t* index;
dict_hdr_t* dict_hdr;
mem_heap_t* heap;
mtr_t mtr;
ulint error;
mtr_start(&mtr);
/* Create the hash tables etc. */
dict_init();
heap = mem_heap_create(450);
mutex_enter(&(dict_sys->mutex));
/* Get the dictionary header */
dict_hdr = dict_hdr_get(&mtr);
/* Because we only write new row ids to disk-based data structure
(dictionary header) when it is divisible by
DICT_HDR_ROW_ID_WRITE_MARGIN, in recovery we will not recover
the latest value of the row id counter. Therefore we advance
the counter at the database startup to avoid overlapping values.
Note that when a user after database startup first time asks for
a new row id, then because the counter is now divisible by
..._MARGIN, it will immediately be updated to the disk-based
header. */
dict_sys->row_id = ut_dulint_add(
ut_dulint_align_up(mtr_read_dulint(dict_hdr + DICT_HDR_ROW_ID,
&mtr),
DICT_HDR_ROW_ID_WRITE_MARGIN),
DICT_HDR_ROW_ID_WRITE_MARGIN);
/* Insert into the dictionary cache the descriptions of the basic
system tables */
/*-------------------------*/
table = dict_mem_table_create("SYS_TABLES", DICT_HDR_SPACE, 8, 0);
dict_mem_table_add_col(table, heap, "NAME", DATA_BINARY, 0, 0);
dict_mem_table_add_col(table, heap, "ID", DATA_BINARY, 0, 0);
/* ROW_FORMAT = (N_COLS >> 31) ? COMPACT : REDUNDANT */
dict_mem_table_add_col(table, heap, "N_COLS", DATA_INT, 0, 4);
/* TYPE is either DICT_TABLE_ORDINARY, or (TYPE & DICT_TF_COMPACT)
and (TYPE & DICT_TF_FORMAT_MASK) are nonzero and TYPE = 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. Currently, these flags include
DICT_TF2_TEMPORARY. */
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_to_cache(table, heap);
dict_sys->sys_tables = table;
mem_heap_empty(heap);
index = dict_mem_index_create("SYS_TABLES", "CLUST_IND",
DICT_HDR_SPACE,
DICT_UNIQUE | DICT_CLUSTERED, 1);
dict_mem_index_add_field(index, "NAME", 0);
index->id = DICT_TABLES_ID;
error = dict_index_add_to_cache(table, index,
mtr_read_ulint(dict_hdr
+ DICT_HDR_TABLES,
MLOG_4BYTES, &mtr),
FALSE);
ut_a(error == DB_SUCCESS);
/*-------------------------*/
index = dict_mem_index_create("SYS_TABLES", "ID_IND",
DICT_HDR_SPACE, DICT_UNIQUE, 1);
dict_mem_index_add_field(index, "ID", 0);
index->id = DICT_TABLE_IDS_ID;
error = dict_index_add_to_cache(table, index,
mtr_read_ulint(dict_hdr
+ DICT_HDR_TABLE_IDS,
MLOG_4BYTES, &mtr),
FALSE);
ut_a(error == DB_SUCCESS);
/*-------------------------*/
table = dict_mem_table_create("SYS_COLUMNS", DICT_HDR_SPACE, 7, 0);
dict_mem_table_add_col(table, heap, "TABLE_ID", DATA_BINARY, 0, 0);
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_to_cache(table, heap);
dict_sys->sys_columns = table;
mem_heap_empty(heap);
index = dict_mem_index_create("SYS_COLUMNS", "CLUST_IND",
DICT_HDR_SPACE,
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;
error = dict_index_add_to_cache(table, index,
mtr_read_ulint(dict_hdr
+ DICT_HDR_COLUMNS,
MLOG_4BYTES, &mtr),
FALSE);
ut_a(error == DB_SUCCESS);
/*-------------------------*/
table = dict_mem_table_create("SYS_INDEXES", DICT_HDR_SPACE, 7, 0);
dict_mem_table_add_col(table, heap, "TABLE_ID", DATA_BINARY, 0, 0);
dict_mem_table_add_col(table, heap, "ID", DATA_BINARY, 0, 0);
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);
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);
/* The '+ 2' below comes from the fields DB_TRX_ID, DB_ROLL_PTR */
#if DICT_SYS_INDEXES_PAGE_NO_FIELD != 6 + 2
#error "DICT_SYS_INDEXES_PAGE_NO_FIELD != 6 + 2"
#endif
#if DICT_SYS_INDEXES_SPACE_NO_FIELD != 5 + 2
#error "DICT_SYS_INDEXES_SPACE_NO_FIELD != 5 + 2"
#endif
#if DICT_SYS_INDEXES_TYPE_FIELD != 4 + 2
#error "DICT_SYS_INDEXES_TYPE_FIELD != 4 + 2"
#endif
#if DICT_SYS_INDEXES_NAME_FIELD != 1 + 2
#error "DICT_SYS_INDEXES_NAME_FIELD != 1 + 2"
#endif
table->id = DICT_INDEXES_ID;
dict_table_add_to_cache(table, heap);
dict_sys->sys_indexes = table;
mem_heap_empty(heap);
index = dict_mem_index_create("SYS_INDEXES", "CLUST_IND",
DICT_HDR_SPACE,
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;
error = dict_index_add_to_cache(table, index,
mtr_read_ulint(dict_hdr
+ DICT_HDR_INDEXES,
MLOG_4BYTES, &mtr),
FALSE);
ut_a(error == DB_SUCCESS);
/*-------------------------*/
table = dict_mem_table_create("SYS_FIELDS", DICT_HDR_SPACE, 3, 0);
dict_mem_table_add_col(table, heap, "INDEX_ID", DATA_BINARY, 0, 0);
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_to_cache(table, heap);
dict_sys->sys_fields = table;
mem_heap_free(heap);
index = dict_mem_index_create("SYS_FIELDS", "CLUST_IND",
DICT_HDR_SPACE,
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;
error = dict_index_add_to_cache(table, index,
mtr_read_ulint(dict_hdr
+ DICT_HDR_FIELDS,
MLOG_4BYTES, &mtr),
FALSE);
ut_a(error == DB_SUCCESS);
mtr_commit(&mtr);
/*-------------------------*/
/* Initialize the insert buffer table and index for each tablespace */
ibuf_init_at_db_start();
/* Load definitions of other indexes on system tables */
dict_load_sys_table(dict_sys->sys_tables);
dict_load_sys_table(dict_sys->sys_columns);
dict_load_sys_table(dict_sys->sys_indexes);
dict_load_sys_table(dict_sys->sys_fields);
mutex_exit(&(dict_sys->mutex));
}
/*****************************************************************//**
Inserts the basic system table data into themselves in the database
creation. */
static
void
dict_insert_initial_data(void)
/*==========================*/
{
/* Does nothing yet */
}
/*****************************************************************//**
Creates and initializes the data dictionary at the database creation. */
UNIV_INTERN
void
dict_create(void)
/*=============*/
{
mtr_t mtr;
mtr_start(&mtr);
dict_hdr_create(&mtr);
mtr_commit(&mtr);
dict_boot();
dict_insert_initial_data();
}
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