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btr0cur.cc
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/*****************************************************************************
Copyright (c) 1994, 2018, Oracle and/or its affiliates. All Rights Reserved.
Copyright (c) 2008, Google Inc.
Copyright (c) 2012, Facebook Inc.
Copyright (c) 2015, 2019, MariaDB Corporation.
Portions of this file contain modifications contributed and copyrighted by
Google, Inc. Those modifications are gratefully acknowledged and are described
briefly in the InnoDB documentation. The contributions by Google are
incorporated with their permission, and subject to the conditions contained in
the file COPYING.Google.
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 btr/btr0cur.cc
The index tree cursor
All changes that row operations make to a B-tree or the records
there must go through this module! Undo log records are written here
of every modify or insert of a clustered index record.
NOTE!!!
To make sure we do not run out of disk space during a pessimistic
insert or update, we have to reserve 2 x the height of the index tree
many pages in the tablespace before we start the operation, because
if leaf splitting has been started, it is difficult to undo, except
by crashing the database and doing a roll-forward.
Created 10/16/1994 Heikki Tuuri
*******************************************************/
#include "btr0cur.h"
#include "row0upd.h"
#include "mtr0log.h"
#include "page0page.h"
#include "page0zip.h"
#include "rem0rec.h"
#include "rem0cmp.h"
#include "buf0lru.h"
#include "btr0btr.h"
#include "btr0sea.h"
#include "row0log.h"
#include "row0purge.h"
#include "row0upd.h"
#include "trx0rec.h"
#include "trx0roll.h"
#include "que0que.h"
#include "row0row.h"
#include "srv0srv.h"
#include "ibuf0ibuf.h"
#include "lock0lock.h"
#include "zlib.h"
#include "srv0start.h"
#include "mysql_com.h"
#include "dict0stats.h"
/** Buffered B-tree operation types, introduced as part of delete buffering. */
enum btr_op_t {
BTR_NO_OP = 0, /*!< Not buffered */
BTR_INSERT_OP, /*!< Insert, do not ignore UNIQUE */
BTR_INSERT_IGNORE_UNIQUE_OP, /*!< Insert, ignoring UNIQUE */
BTR_DELETE_OP, /*!< Purge a delete-marked record */
BTR_DELMARK_OP /*!< Mark a record for deletion */
};
/** Modification types for the B-tree operation. */
enum btr_intention_t {
BTR_INTENTION_DELETE,
BTR_INTENTION_BOTH,
BTR_INTENTION_INSERT
};
#if BTR_INTENTION_DELETE > BTR_INTENTION_BOTH
#error "BTR_INTENTION_DELETE > BTR_INTENTION_BOTH"
#endif
#if BTR_INTENTION_BOTH > BTR_INTENTION_INSERT
#error "BTR_INTENTION_BOTH > BTR_INTENTION_INSERT"
#endif
/** For the index->lock scalability improvement, only possibility of clear
performance regression observed was caused by grown huge history list length.
That is because the exclusive use of index->lock also worked as reserving
free blocks and read IO bandwidth with priority. To avoid huge glowing history
list as same level with previous implementation, prioritizes pessimistic tree
operations by purge as the previous, when it seems to be growing huge.
Experimentally, the history list length starts to affect to performance
throughput clearly from about 100000. */
#define BTR_CUR_FINE_HISTORY_LENGTH 100000
/** Number of searches down the B-tree in btr_cur_search_to_nth_level(). */
ulint btr_cur_n_non_sea;
/** Old value of btr_cur_n_non_sea. Copied by
srv_refresh_innodb_monitor_stats(). Referenced by
srv_printf_innodb_monitor(). */
ulint btr_cur_n_non_sea_old;
#ifdef BTR_CUR_HASH_ADAPT
/** Number of successful adaptive hash index lookups in
btr_cur_search_to_nth_level(). */
ulint btr_cur_n_sea;
/** Old value of btr_cur_n_sea. Copied by
srv_refresh_innodb_monitor_stats(). Referenced by
srv_printf_innodb_monitor(). */
ulint btr_cur_n_sea_old;
#endif /* BTR_CUR_HASH_ADAPT */
#ifdef UNIV_DEBUG
/* Flag to limit optimistic insert records */
uint btr_cur_limit_optimistic_insert_debug;
#endif /* UNIV_DEBUG */
/** In the optimistic insert, if the insert does not fit, but this much space
can be released by page reorganize, then it is reorganized */
#define BTR_CUR_PAGE_REORGANIZE_LIMIT (UNIV_PAGE_SIZE / 32)
/** The structure of a BLOB part header */
/* @{ */
/*--------------------------------------*/
#define BTR_BLOB_HDR_PART_LEN 0 /*!< BLOB part len on this
page */
#define BTR_BLOB_HDR_NEXT_PAGE_NO 4 /*!< next BLOB part page no,
FIL_NULL if none */
/*--------------------------------------*/
#define BTR_BLOB_HDR_SIZE 8 /*!< Size of a BLOB
part header, in bytes */
/** Estimated table level stats from sampled value.
@param value sampled stats
@param index index being sampled
@param sample number of sampled rows
@param ext_size external stored data size
@param not_empty table not empty
@return estimated table wide stats from sampled value */
#define BTR_TABLE_STATS_FROM_SAMPLE(value, index, sample, ext_size, not_empty) \
(((value) * static_cast<ib_uint64_t>(index->stat_n_leaf_pages) \
+ (sample) - 1 + (ext_size) + (not_empty)) / ((sample) + (ext_size)))
/* @} */
/*******************************************************************//**
Marks all extern fields in a record as owned by the record. This function
should be called if the delete mark of a record is removed: a not delete
marked record always owns all its extern fields. */
static
void
btr_cur_unmark_extern_fields(
/*=========================*/
page_zip_des_t* page_zip,/*!< in/out: compressed page whose uncompressed
part will be updated, or NULL */
rec_t* rec, /*!< in/out: record in a clustered index */
dict_index_t* index, /*!< in: index of the page */
const ulint* offsets,/*!< in: array returned by rec_get_offsets() */
mtr_t* mtr); /*!< in: mtr, or NULL if not logged */
/*******************************************************************//**
Adds path information to the cursor for the current page, for which
the binary search has been performed. */
static
void
btr_cur_add_path_info(
/*==================*/
btr_cur_t* cursor, /*!< in: cursor positioned on a page */
ulint height, /*!< in: height of the page in tree;
0 means leaf node */
ulint root_height); /*!< in: root node height in tree */
/***********************************************************//**
Frees the externally stored fields for a record, if the field is mentioned
in the update vector. */
static
void
btr_rec_free_updated_extern_fields(
/*===============================*/
dict_index_t* index, /*!< in: index of rec; the index tree MUST be
X-latched */
rec_t* rec, /*!< in: record */
page_zip_des_t* page_zip,/*!< in: compressed page whose uncompressed
part will be updated, or NULL */
const ulint* offsets,/*!< in: rec_get_offsets(rec, index) */
const upd_t* update, /*!< in: update vector */
bool rollback,/*!< in: performing rollback? */
mtr_t* mtr); /*!< in: mini-transaction handle which contains
an X-latch to record page and to the tree */
/***********************************************************//**
Frees the externally stored fields for a record. */
static
void
btr_rec_free_externally_stored_fields(
/*==================================*/
dict_index_t* index, /*!< in: index of the data, the index
tree MUST be X-latched */
rec_t* rec, /*!< in: record */
const ulint* offsets,/*!< in: rec_get_offsets(rec, index) */
page_zip_des_t* page_zip,/*!< in: compressed page whose uncompressed
part will be updated, or NULL */
bool rollback,/*!< in: performing rollback? */
mtr_t* mtr); /*!< in: mini-transaction handle which contains
an X-latch to record page and to the index
tree */
/*==================== B-TREE SEARCH =========================*/
#if MTR_MEMO_PAGE_S_FIX != RW_S_LATCH
#error "MTR_MEMO_PAGE_S_FIX != RW_S_LATCH"
#endif
#if MTR_MEMO_PAGE_X_FIX != RW_X_LATCH
#error "MTR_MEMO_PAGE_X_FIX != RW_X_LATCH"
#endif
#if MTR_MEMO_PAGE_SX_FIX != RW_SX_LATCH
#error "MTR_MEMO_PAGE_SX_FIX != RW_SX_LATCH"
#endif
/** Latches the leaf page or pages requested.
@param[in] block leaf page where the search converged
@param[in] page_id page id of the leaf
@param[in] latch_mode BTR_SEARCH_LEAF, ...
@param[in] cursor cursor
@param[in] mtr mini-transaction
@return blocks and savepoints which actually latched. */
btr_latch_leaves_t
btr_cur_latch_leaves(
buf_block_t* block,
const page_id_t page_id,
const page_size_t& page_size,
ulint latch_mode,
btr_cur_t* cursor,
mtr_t* mtr)
{
ulint mode;
ulint left_page_no;
ulint right_page_no;
buf_block_t* get_block;
page_t* page = buf_block_get_frame(block);
bool spatial;
btr_latch_leaves_t latch_leaves = {{NULL, NULL, NULL}, {0, 0, 0}};
spatial = dict_index_is_spatial(cursor->index) && cursor->rtr_info;
ut_ad(buf_page_in_file(&block->page));
switch (latch_mode) {
case BTR_SEARCH_LEAF:
case BTR_MODIFY_LEAF:
case BTR_SEARCH_TREE:
if (spatial) {
cursor->rtr_info->tree_savepoints[RTR_MAX_LEVELS]
= mtr_set_savepoint(mtr);
}
mode = latch_mode == BTR_MODIFY_LEAF ? RW_X_LATCH : RW_S_LATCH;
latch_leaves.savepoints[1] = mtr_set_savepoint(mtr);
get_block = btr_block_get(page_id, page_size, mode,
cursor->index, mtr);
latch_leaves.blocks[1] = get_block;
#ifdef UNIV_BTR_DEBUG
ut_a(page_is_comp(get_block->frame) == page_is_comp(page));
#endif /* UNIV_BTR_DEBUG */
if (spatial) {
cursor->rtr_info->tree_blocks[RTR_MAX_LEVELS]
= get_block;
}
return(latch_leaves);
case BTR_MODIFY_TREE:
/* It is exclusive for other operations which calls
btr_page_set_prev() */
ut_ad(mtr_memo_contains_flagged(
mtr,
dict_index_get_lock(cursor->index),
MTR_MEMO_X_LOCK | MTR_MEMO_SX_LOCK));
/* x-latch also siblings from left to right */
left_page_no = btr_page_get_prev(page, mtr);
mode = latch_mode;
if (left_page_no != FIL_NULL) {
if (spatial) {
cursor->rtr_info->tree_savepoints[
RTR_MAX_LEVELS] = mtr_set_savepoint(mtr);
}
latch_leaves.savepoints[0] = mtr_set_savepoint(mtr);
get_block = btr_block_get(
page_id_t(page_id.space(), left_page_no),
page_size, RW_X_LATCH, cursor->index, mtr);
latch_leaves.blocks[0] = get_block;
if (spatial) {
cursor->rtr_info->tree_blocks[RTR_MAX_LEVELS]
= get_block;
}
}
if (spatial) {
cursor->rtr_info->tree_savepoints[RTR_MAX_LEVELS + 1]
= mtr_set_savepoint(mtr);
}
latch_leaves.savepoints[1] = mtr_set_savepoint(mtr);
get_block = btr_block_get(
page_id, page_size, RW_X_LATCH, cursor->index, mtr);
latch_leaves.blocks[1] = get_block;
#ifdef UNIV_BTR_DEBUG
/* Sanity check only after both the blocks are latched. */
if (latch_leaves.blocks[0] != NULL) {
ut_a(page_is_comp(latch_leaves.blocks[0]->frame)
== page_is_comp(page));
ut_a(btr_page_get_next(
latch_leaves.blocks[0]->frame, mtr)
== page_get_page_no(page));
}
ut_a(page_is_comp(get_block->frame) == page_is_comp(page));
#endif /* UNIV_BTR_DEBUG */
if (spatial) {
cursor->rtr_info->tree_blocks[RTR_MAX_LEVELS + 1]
= get_block;
}
right_page_no = btr_page_get_next(page, mtr);
if (right_page_no != FIL_NULL) {
if (spatial) {
cursor->rtr_info->tree_savepoints[
RTR_MAX_LEVELS + 2] = mtr_set_savepoint(
mtr);
}
latch_leaves.savepoints[2] = mtr_set_savepoint(mtr);
get_block = btr_block_get(
page_id_t(page_id.space(), right_page_no),
page_size, RW_X_LATCH, cursor->index, mtr);
latch_leaves.blocks[2] = get_block;
#ifdef UNIV_BTR_DEBUG
ut_a(page_is_comp(get_block->frame)
== page_is_comp(page));
ut_a(btr_page_get_prev(get_block->frame, mtr)
== page_get_page_no(page));
#endif /* UNIV_BTR_DEBUG */
if (spatial) {
cursor->rtr_info->tree_blocks[
RTR_MAX_LEVELS + 2] = get_block;
}
}
return(latch_leaves);
case BTR_SEARCH_PREV:
case BTR_MODIFY_PREV:
mode = latch_mode == BTR_SEARCH_PREV ? RW_S_LATCH : RW_X_LATCH;
/* latch also left sibling */
rw_lock_s_lock(&block->lock);
left_page_no = btr_page_get_prev(page, mtr);
rw_lock_s_unlock(&block->lock);
if (left_page_no != FIL_NULL) {
latch_leaves.savepoints[0] = mtr_set_savepoint(mtr);
get_block = btr_block_get(
page_id_t(page_id.space(), left_page_no),
page_size, mode, cursor->index, mtr);
latch_leaves.blocks[0] = get_block;
cursor->left_block = get_block;
#ifdef UNIV_BTR_DEBUG
ut_a(page_is_comp(get_block->frame)
== page_is_comp(page));
ut_a(btr_page_get_next(get_block->frame, mtr)
== page_get_page_no(page));
#endif /* UNIV_BTR_DEBUG */
}
latch_leaves.savepoints[1] = mtr_set_savepoint(mtr);
get_block = btr_block_get(page_id, page_size, mode,
cursor->index, mtr);
latch_leaves.blocks[1] = get_block;
#ifdef UNIV_BTR_DEBUG
ut_a(page_is_comp(get_block->frame) == page_is_comp(page));
#endif /* UNIV_BTR_DEBUG */
return(latch_leaves);
case BTR_CONT_MODIFY_TREE:
ut_ad(dict_index_is_spatial(cursor->index));
return(latch_leaves);
}
ut_error;
return(latch_leaves);
}
/** Optimistically latches the leaf page or pages requested.
@param[in] block guessed buffer block
@param[in] modify_clock modify clock value
@param[in,out] latch_mode BTR_SEARCH_LEAF, ...
@param[in,out] cursor cursor
@param[in] file file name
@param[in] line line where called
@param[in] mtr mini-transaction
@return true if success */
bool
btr_cur_optimistic_latch_leaves(
buf_block_t* block,
ib_uint64_t modify_clock,
ulint* latch_mode,
btr_cur_t* cursor,
const char* file,
unsigned line,
mtr_t* mtr)
{
ulint mode;
ulint left_page_no;
switch (*latch_mode) {
case BTR_SEARCH_LEAF:
case BTR_MODIFY_LEAF:
return(buf_page_optimistic_get(*latch_mode, block,
modify_clock, file, line, mtr));
case BTR_SEARCH_PREV:
case BTR_MODIFY_PREV:
mode = *latch_mode == BTR_SEARCH_PREV
? RW_S_LATCH : RW_X_LATCH;
buf_page_mutex_enter(block);
if (buf_block_get_state(block) != BUF_BLOCK_FILE_PAGE) {
buf_page_mutex_exit(block);
return(false);
}
/* pin the block not to be relocated */
buf_block_buf_fix_inc(block, file, line);
buf_page_mutex_exit(block);
rw_lock_s_lock(&block->lock);
if (block->modify_clock != modify_clock) {
rw_lock_s_unlock(&block->lock);
goto unpin_failed;
}
left_page_no = btr_page_get_prev(
buf_block_get_frame(block), mtr);
rw_lock_s_unlock(&block->lock);
if (left_page_no != FIL_NULL) {
const page_id_t page_id(
dict_index_get_space(cursor->index),
left_page_no);
cursor->left_block = btr_block_get(
page_id,
dict_table_page_size(cursor->index->table),
mode, cursor->index, mtr);
} else {
cursor->left_block = NULL;
}
if (buf_page_optimistic_get(mode, block, modify_clock,
file, line, mtr)) {
if (btr_page_get_prev(buf_block_get_frame(block), mtr)
== left_page_no) {
buf_block_buf_fix_dec(block);
*latch_mode = mode;
return(true);
} else {
/* release the block */
btr_leaf_page_release(block, mode, mtr);
}
}
/* release the left block */
if (cursor->left_block != NULL) {
btr_leaf_page_release(cursor->left_block,
mode, mtr);
}
unpin_failed:
/* unpin the block */
buf_block_buf_fix_dec(block);
return(false);
default:
ut_error;
return(false);
}
}
/**
Gets intention in btr_intention_t from latch_mode, and cleares the intention
at the latch_mode.
@param latch_mode in/out: pointer to latch_mode
@return intention for latching tree */
static
btr_intention_t
btr_cur_get_and_clear_intention(
ulint *latch_mode)
{
btr_intention_t intention;
switch (*latch_mode & (BTR_LATCH_FOR_INSERT | BTR_LATCH_FOR_DELETE)) {
case BTR_LATCH_FOR_INSERT:
intention = BTR_INTENTION_INSERT;
break;
case BTR_LATCH_FOR_DELETE:
intention = BTR_INTENTION_DELETE;
break;
default:
/* both or unknown */
intention = BTR_INTENTION_BOTH;
}
*latch_mode &= ~(BTR_LATCH_FOR_INSERT | BTR_LATCH_FOR_DELETE);
return(intention);
}
/**
Gets the desired latch type for the root leaf (root page is root leaf)
at the latch mode.
@param latch_mode in: BTR_SEARCH_LEAF, ...
@return latch type */
static
rw_lock_type_t
btr_cur_latch_for_root_leaf(
ulint latch_mode)
{
switch (latch_mode) {
case BTR_SEARCH_LEAF:
case BTR_SEARCH_TREE:
case BTR_SEARCH_PREV:
return(RW_S_LATCH);
case BTR_MODIFY_LEAF:
case BTR_MODIFY_TREE:
case BTR_MODIFY_PREV:
return(RW_X_LATCH);
case BTR_CONT_MODIFY_TREE:
case BTR_CONT_SEARCH_TREE:
/* A root page should be latched already,
and don't need to be latched here.
fall through (RW_NO_LATCH) */
case BTR_NO_LATCHES:
return(RW_NO_LATCH);
}
ut_error;
return(RW_NO_LATCH); /* avoid compiler warnings */
}
/** Detects whether the modifying record might need a modifying tree structure.
@param[in] index index
@param[in] page page
@param[in] lock_intention lock intention for the tree operation
@param[in] rec record (current node_ptr)
@param[in] rec_size size of the record or max size of node_ptr
@param[in] page_size page size
@param[in] mtr mtr
@return true if tree modification is needed */
static
bool
btr_cur_will_modify_tree(
dict_index_t* index,
const page_t* page,
btr_intention_t lock_intention,
const rec_t* rec,
ulint rec_size,
const page_size_t& page_size,
mtr_t* mtr)
{
ut_ad(!page_is_leaf(page));
ut_ad(mtr_memo_contains_flagged(mtr, dict_index_get_lock(index),
MTR_MEMO_X_LOCK | MTR_MEMO_SX_LOCK));
/* Pessimistic delete of the first record causes delete & insert
of node_ptr at upper level. And a subsequent page shrink is
possible. It causes delete of node_ptr at the upper level.
So we should pay attention also to 2nd record not only
first record and last record. Because if the "delete & insert" are
done for the different page, the 2nd record become
first record and following compress might delete the record and causes
the uppper level node_ptr modification. */
const ulint n_recs = page_get_n_recs(page);
if (lock_intention <= BTR_INTENTION_BOTH) {
ulint margin;
/* check delete will cause. (BTR_INTENTION_BOTH
or BTR_INTENTION_DELETE) */
/* first, 2nd, 2nd-last and last records are 4 records */
if (n_recs < 5) {
return(true);
}
/* is first, 2nd or last record */
if (page_rec_is_first(rec, page)
|| (mach_read_from_4(page + FIL_PAGE_NEXT) != FIL_NULL
&& (page_rec_is_last(rec, page)
|| page_rec_is_second_last(rec, page)))
|| (mach_read_from_4(page + FIL_PAGE_PREV) != FIL_NULL
&& page_rec_is_second(rec, page))) {
return(true);
}
if (lock_intention == BTR_INTENTION_BOTH) {
/* Delete at leftmost record in a page causes delete
& insert at its parent page. After that, the delete
might cause btr_compress() and delete record at its
parent page. Thus we should consider max 2 deletes. */
margin = rec_size * 2;
} else {
ut_ad(lock_intention == BTR_INTENTION_DELETE);
margin = rec_size;
}
/* NOTE: call mach_read_from_4() directly to avoid assertion
failure. It is safe because we already have SX latch of the
index tree */
if (page_get_data_size(page)
< margin + BTR_CUR_PAGE_COMPRESS_LIMIT(index)
|| (mach_read_from_4(page + FIL_PAGE_NEXT)
== FIL_NULL
&& mach_read_from_4(page + FIL_PAGE_PREV)
== FIL_NULL)) {
return(true);
}
}
if (lock_intention >= BTR_INTENTION_BOTH) {
/* check insert will cause. BTR_INTENTION_BOTH
or BTR_INTENTION_INSERT*/
/* Once we invoke the btr_cur_limit_optimistic_insert_debug,
we should check it here in advance, since the max allowable
records in a page is limited. */
LIMIT_OPTIMISTIC_INSERT_DEBUG(n_recs, return true);
/* needs 2 records' space for the case the single split and
insert cannot fit.
page_get_max_insert_size_after_reorganize() includes space
for page directory already */
ulint max_size
= page_get_max_insert_size_after_reorganize(page, 2);
if (max_size < BTR_CUR_PAGE_REORGANIZE_LIMIT + rec_size
|| max_size < rec_size * 2) {
return(true);
}
/* TODO: optimize this condition for ROW_FORMAT=COMPRESSED.
This is based on the worst case, and we could invoke
page_zip_available() on the block->page.zip. */
/* needs 2 records' space also for worst compress rate. */
if (page_size.is_compressed()
&& page_zip_empty_size(index->n_fields,
page_size.physical())
<= rec_size * 2 + page_get_data_size(page)
+ page_dir_calc_reserved_space(n_recs + 2)) {
return(true);
}
}
return(false);
}
/** Detects whether the modifying record might need a opposite modification
to the intention.
@param[in] page page
@param[in] lock_intention lock intention for the tree operation
@param[in] rec record (current node_ptr)
@return true if tree modification is needed */
static
bool
btr_cur_need_opposite_intention(
const page_t* page,
btr_intention_t lock_intention,
const rec_t* rec)
{
switch (lock_intention) {
case BTR_INTENTION_DELETE:
return((mach_read_from_4(page + FIL_PAGE_PREV) != FIL_NULL
&& page_rec_is_first(rec, page))
|| (mach_read_from_4(page + FIL_PAGE_NEXT) != FIL_NULL
&& page_rec_is_last(rec, page)));
case BTR_INTENTION_INSERT:
return(mach_read_from_4(page + FIL_PAGE_NEXT) != FIL_NULL
&& page_rec_is_last(rec, page));
case BTR_INTENTION_BOTH:
return(false);
}
ut_error;
return(false);
}
/**
@param[in] index b-tree
@return maximum size of a node pointer record in bytes */
static ulint btr_node_ptr_max_size(const dict_index_t* index)
{
if (dict_index_is_ibuf(index)) {
/* cannot estimate accurately */
/* This is universal index for change buffer.
The max size of the entry is about max key length * 2.
(index key + primary key to be inserted to the index)
(The max key length is UNIV_PAGE_SIZE / 16 * 3 at
ha_innobase::max_supported_key_length(),
considering MAX_KEY_LENGTH = 3072 at MySQL imposes
the 3500 historical InnoDB value for 16K page size case.)
For the universal index, node_ptr contains most of the entry.
And 512 is enough to contain ibuf columns and meta-data */
return srv_page_size / 8 * 3 + 512;
}
/* Each record has page_no, length of page_no and header. */
ulint comp = dict_table_is_comp(index->table);
ulint rec_max_size = comp
? REC_NODE_PTR_SIZE + 1 + REC_N_NEW_EXTRA_BYTES
+ UT_BITS_IN_BYTES(index->n_nullable)
: REC_NODE_PTR_SIZE + 2 + REC_N_OLD_EXTRA_BYTES
+ 2 * index->n_fields;
/* Compute the maximum possible record size. */
for (ulint i = 0; i < dict_index_get_n_unique_in_tree(index); i++) {
const dict_field_t* field
= dict_index_get_nth_field(index, i);
const dict_col_t* col
= dict_field_get_col(field);
ulint field_max_size;
ulint field_ext_max_size;
/* Determine the maximum length of the index field. */
field_max_size = dict_col_get_fixed_size(col, comp);
if (field_max_size) {
/* dict_index_add_col() should guarantee this */
ut_ad(!field->prefix_len
|| field->fixed_len == field->prefix_len);
/* Fixed lengths are not encoded
in ROW_FORMAT=COMPACT. */
rec_max_size += field_max_size;
continue;
}
field_max_size = dict_col_get_max_size(col);
if (UNIV_UNLIKELY(!field_max_size)) {
switch (col->mtype) {
case DATA_VARCHAR:
if (!comp
&& (!strcmp(index->table->name.m_name,
"SYS_FOREIGN")
|| !strcmp(index->table->name.m_name,
"SYS_FOREIGN_COLS"))) {
break;
}
/* fall through */
case DATA_VARMYSQL:
case DATA_CHAR:
case DATA_MYSQL:
/* CHAR(0) and VARCHAR(0) are possible
data type definitions in MariaDB.
The InnoDB internal SQL parser maps
CHAR to DATA_VARCHAR, so DATA_CHAR (or
DATA_MYSQL) is only coming from the
MariaDB SQL layer. */
if (comp) {
/* Add a length byte, because
fixed-length empty field are
encoded as variable-length.
For ROW_FORMAT=REDUNDANT,
these bytes were added to
rec_max_size before this loop. */
rec_max_size++;
}
continue;
}
/* SYS_FOREIGN.ID is defined as CHAR in the
InnoDB internal SQL parser, which translates
into the incorrect VARCHAR(0). InnoDB does
not enforce maximum lengths of columns, so
that is why any data can be inserted in the
first place.
Likewise, SYS_FOREIGN.FOR_NAME,
SYS_FOREIGN.REF_NAME, SYS_FOREIGN_COLS.ID, are
defined as CHAR, and also they are part of a key. */
ut_ad(!strcmp(index->table->name.m_name,
"SYS_FOREIGN")
|| !strcmp(index->table->name.m_name,
"SYS_FOREIGN_COLS"));
ut_ad(!comp);
ut_ad(col->mtype == DATA_VARCHAR);
rec_max_size += (srv_page_size == UNIV_PAGE_SIZE_MAX)
? REDUNDANT_REC_MAX_DATA_SIZE
: page_get_free_space_of_empty(FALSE) / 2;
} else if (field_max_size == NAME_LEN && i == 1
&& (!strcmp(index->table->name.m_name,
TABLE_STATS_NAME)
|| !strcmp(index->table->name.m_name,
INDEX_STATS_NAME))) {
ut_ad(!strcmp(field->name, "table_name"));
/* Interpret "table_name" as VARCHAR(199) even
if it was incorrectly defined as VARCHAR(64).
While the caller of ha_innobase enforces the
maximum length on any data written, the InnoDB
internal SQL parser will happily write as much
data as is provided. The purpose of this hack
is to avoid InnoDB hangs after persistent
statistics on partitioned tables are
deleted. */
field_max_size = 199 * SYSTEM_CHARSET_MBMAXLEN;
}
field_ext_max_size = field_max_size < 256 ? 1 : 2;
if (field->prefix_len
&& field->prefix_len < field_max_size) {
field_max_size = field->prefix_len;
}
if (comp) {
/* Add the extra size for ROW_FORMAT=COMPACT.
For ROW_FORMAT=REDUNDANT, these bytes were
added to rec_max_size before this loop. */
rec_max_size += field_ext_max_size;
}
rec_max_size += field_max_size;
}
return rec_max_size;
}
/********************************************************************//**
Searches an index tree and positions a tree cursor on a given level.
NOTE: n_fields_cmp in tuple must be set so that it cannot be compared
to node pointer page number fields on the upper levels of the tree!
Note that if mode is PAGE_CUR_LE, which is used in inserts, then
cursor->up_match and cursor->low_match both will have sensible values.
If mode is PAGE_CUR_GE, then up_match will a have a sensible value.
If mode is PAGE_CUR_LE , cursor is left at the place where an insert of the
search tuple should be performed in the B-tree. InnoDB does an insert
immediately after the cursor. Thus, the cursor may end up on a user record,
or on a page infimum record. */
dberr_t
btr_cur_search_to_nth_level(
/*========================*/
dict_index_t* index, /*!< in: index */
ulint level, /*!< in: the tree level of search */
const dtuple_t* tuple, /*!< in: data tuple; NOTE: n_fields_cmp in
tuple must be set so that it cannot get
compared to the node ptr page number field! */
page_cur_mode_t mode, /*!< in: PAGE_CUR_L, ...;
Inserts should always be made using
PAGE_CUR_LE to search the position! */
ulint latch_mode, /*!< in: BTR_SEARCH_LEAF, ..., ORed with
at most one of BTR_INSERT, BTR_DELETE_MARK,
BTR_DELETE, or BTR_ESTIMATE;
cursor->left_block is used to store a pointer
to the left neighbor page, in the cases
BTR_SEARCH_PREV and BTR_MODIFY_PREV;
NOTE that if has_search_latch
is != 0, we maybe do not have a latch set
on the cursor page, we assume
the caller uses his search latch
to protect the record! */
btr_cur_t* cursor, /*!< in/out: tree cursor; the cursor page is
s- or x-latched, but see also above! */
ulint has_search_latch,
/*!< in: info on the latch mode the
caller currently has on search system:
RW_S_LATCH, or 0 */
const char* file, /*!< in: file name */
unsigned line, /*!< in: line where called */
mtr_t* mtr, /*!< in: mtr */
ib_uint64_t autoinc)/*!< in: PAGE_ROOT_AUTO_INC to be written
(0 if none) */
{
page_t* page = NULL; /* remove warning */
buf_block_t* block;
buf_block_t* guess;
ulint height;
ulint up_match;
ulint up_bytes;
ulint low_match;
ulint low_bytes;
ulint savepoint;
ulint rw_latch;
page_cur_mode_t page_mode;
page_cur_mode_t search_mode = PAGE_CUR_UNSUPP;
ulint buf_mode;
ulint estimate;
ulint node_ptr_max_size = UNIV_PAGE_SIZE / 2;
page_cur_t* page_cursor;
btr_op_t btr_op;
ulint root_height = 0; /* remove warning */
dberr_t err = DB_SUCCESS;
ulint upper_rw_latch, root_leaf_rw_latch;
btr_intention_t lock_intention;
bool modify_external;
buf_block_t* tree_blocks[BTR_MAX_LEVELS];
ulint tree_savepoints[BTR_MAX_LEVELS];
ulint n_blocks = 0;
ulint n_releases = 0;
bool detected_same_key_root = false;
bool retrying_for_search_prev = false;
ulint leftmost_from_level = 0;
buf_block_t** prev_tree_blocks = NULL;
ulint* prev_tree_savepoints = NULL;
ulint prev_n_blocks = 0;
ulint prev_n_releases = 0;
bool need_path = true;
bool rtree_parent_modified = false;
bool mbr_adj = false;
bool found = false;
DBUG_ENTER("btr_cur_search_to_nth_level");
#ifdef BTR_CUR_ADAPT
btr_search_t* info;
#endif /* BTR_CUR_ADAPT */
mem_heap_t* heap = NULL;
ulint offsets_[REC_OFFS_NORMAL_SIZE];
ulint* offsets = offsets_;
ulint offsets2_[REC_OFFS_NORMAL_SIZE];
ulint* offsets2 = offsets2_;
rec_offs_init(offsets_);
rec_offs_init(offsets2_);
/* Currently, PAGE_CUR_LE is the only search mode used for searches
ending to upper levels */
ut_ad(level == 0 || mode == PAGE_CUR_LE
|| RTREE_SEARCH_MODE(mode));
ut_ad(dict_index_check_search_tuple(index, tuple));
ut_ad(!dict_index_is_ibuf(index) || ibuf_inside(mtr));
ut_ad(dtuple_check_typed(tuple));
ut_ad(!(index->type & DICT_FTS));
ut_ad(index->page != FIL_NULL);
UNIV_MEM_INVALID(&cursor->up_match, sizeof cursor->up_match);
UNIV_MEM_INVALID(&cursor->up_bytes, sizeof cursor->up_bytes);
UNIV_MEM_INVALID(&cursor->low_match, sizeof cursor->low_match);
UNIV_MEM_INVALID(&cursor->low_bytes, sizeof cursor->low_bytes);
#ifdef UNIV_DEBUG
cursor->up_match = ULINT_UNDEFINED;
cursor->low_match = ULINT_UNDEFINED;
#endif /* UNIV_DEBUG */
ibool s_latch_by_caller;
s_latch_by_caller = latch_mode & BTR_ALREADY_S_LATCHED;
ut_ad(!s_latch_by_caller
|| srv_read_only_mode
|| mtr_memo_contains_flagged(mtr,
dict_index_get_lock(index),
MTR_MEMO_S_LOCK
| MTR_MEMO_SX_LOCK));
/* These flags are mutually exclusive, they are lumped together
with the latch mode for historical reasons. It's possible for
none of the flags to be set. */
switch (UNIV_EXPECT(latch_mode
& (BTR_INSERT | BTR_DELETE | BTR_DELETE_MARK),
0)) {
case 0:
btr_op = BTR_NO_OP;
break;
case BTR_INSERT:
btr_op = (latch_mode & BTR_IGNORE_SEC_UNIQUE)
? BTR_INSERT_IGNORE_UNIQUE_OP
: BTR_INSERT_OP;
break;
case BTR_DELETE:
btr_op = BTR_DELETE_OP;
ut_a(cursor->purge_node);
break;
case BTR_DELETE_MARK:
btr_op = BTR_DELMARK_OP;
break;
default:
/* only one of BTR_INSERT, BTR_DELETE, BTR_DELETE_MARK
should be specified at a time */
ut_error;
}
/* Operations on the insert buffer tree cannot be buffered. */
ut_ad(btr_op == BTR_NO_OP || !dict_index_is_ibuf(index));
/* Operations on the clustered index cannot be buffered. */
ut_ad(btr_op == BTR_NO_OP || !dict_index_is_clust(index));
/* Operations on the temporary table(indexes) cannot be buffered. */
ut_ad(btr_op == BTR_NO_OP || !dict_table_is_temporary(index->table));
/* Operation on the spatial index cannot be buffered. */