mirror of
https://github.com/MariaDB/server.git
synced 2025-01-31 02:51:44 +01:00
4f8555f1f6
MDEV-14511 tried to avoid some consistency problems related to InnoDB persistent statistics. The persistent statistics are being written by an InnoDB internal SQL interpreter that requires the InnoDB data dictionary cache to be locked. Before MDEV-14511, the statistics were written during DDL in separate transactions, which could unnecessarily reduce performance (each commit would require a redo log flush) and break atomicity, because the statistics would be updated separately from the dictionary transaction. However, because it is unacceptable to hold the InnoDB data dictionary cache locked while suspending the execution for waiting for a transactional lock (in the mysql.innodb_index_stats or mysql.innodb_table_stats tables) to be released, any lock conflict was immediately be reported as "lock wait timeout". To fix MDEV-14941, an attempt to reduce these lock conflicts by acquiring transactional locks on the user tables in both the statistics and DDL operations was made, but it would still not entirely prevent lock conflicts on the mysql.innodb_index_stats and mysql.innodb_table_stats tables. Fixing the remaining problems would require a change that is too intrusive for a GA release series, such as MariaDB 10.2. Thefefore, we revert the change MDEV-14511. To silence the MDEV-13201 assertion, we use the pre-existing flag trx_t::internal.
235 lines
8.8 KiB
C
235 lines
8.8 KiB
C
/*****************************************************************************
|
|
|
|
Copyright (c) 2009, 2016, Oracle and/or its affiliates. All Rights Reserved.
|
|
Copyright (c) 2017, 2018, 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, Suite 500, Boston, MA 02110-1335 USA
|
|
|
|
*****************************************************************************/
|
|
|
|
/**************************************************//**
|
|
@file include/dict0stats.h
|
|
Code used for calculating and manipulating table statistics.
|
|
|
|
Created Jan 06, 2010 Vasil Dimov
|
|
*******************************************************/
|
|
|
|
#ifndef dict0stats_h
|
|
#define dict0stats_h
|
|
|
|
#include "univ.i"
|
|
|
|
#include "dict0types.h"
|
|
#include "trx0types.h"
|
|
|
|
enum dict_stats_upd_option_t {
|
|
DICT_STATS_RECALC_PERSISTENT,/* (re) calculate the
|
|
statistics using a precise and slow
|
|
algo and save them to the persistent
|
|
storage, if the persistent storage is
|
|
not present then emit a warning and
|
|
fall back to transient stats */
|
|
DICT_STATS_RECALC_TRANSIENT,/* (re) calculate the statistics
|
|
using an imprecise quick algo
|
|
without saving the results
|
|
persistently */
|
|
DICT_STATS_EMPTY_TABLE, /* Write all zeros (or 1 where it makes sense)
|
|
into a table and its indexes' statistics
|
|
members. The resulting stats correspond to an
|
|
empty table. If the table is using persistent
|
|
statistics, then they are saved on disk. */
|
|
DICT_STATS_FETCH_ONLY_IF_NOT_IN_MEMORY /* fetch the stats
|
|
from the persistent storage if the in-memory
|
|
structures have not been initialized yet,
|
|
otherwise do nothing */
|
|
};
|
|
|
|
/*********************************************************************//**
|
|
Set the persistent statistics flag for a given table. This is set only
|
|
in the in-memory table object and is not saved on disk. It will be read
|
|
from the .frm file upon first open from MySQL after a server restart. */
|
|
UNIV_INLINE
|
|
void
|
|
dict_stats_set_persistent(
|
|
/*======================*/
|
|
dict_table_t* table, /*!< in/out: table */
|
|
ibool ps_on, /*!< in: persistent stats explicitly enabled */
|
|
ibool ps_off) /*!< in: persistent stats explicitly disabled */
|
|
MY_ATTRIBUTE((nonnull));
|
|
|
|
/** @return whether persistent statistics is enabled for a given table */
|
|
UNIV_INLINE
|
|
bool
|
|
dict_stats_is_persistent_enabled(const dict_table_t* table)
|
|
MY_ATTRIBUTE((nonnull, warn_unused_result));
|
|
|
|
/*********************************************************************//**
|
|
Set the auto recalc flag for a given table (only honored for a persistent
|
|
stats enabled table). The flag is set only in the in-memory table object
|
|
and is not saved in InnoDB files. It will be read from the .frm file upon
|
|
first open from MySQL after a server restart. */
|
|
UNIV_INLINE
|
|
void
|
|
dict_stats_auto_recalc_set(
|
|
/*=======================*/
|
|
dict_table_t* table, /*!< in/out: table */
|
|
ibool auto_recalc_on, /*!< in: explicitly enabled */
|
|
ibool auto_recalc_off); /*!< in: explicitly disabled */
|
|
|
|
/** @return whether auto recalc is enabled for a given table*/
|
|
UNIV_INLINE
|
|
bool
|
|
dict_stats_auto_recalc_is_enabled(const dict_table_t* table)
|
|
MY_ATTRIBUTE((nonnull, warn_unused_result));
|
|
|
|
/*********************************************************************//**
|
|
Initialize table's stats for the first time when opening a table. */
|
|
UNIV_INLINE
|
|
void
|
|
dict_stats_init(
|
|
/*============*/
|
|
dict_table_t* table); /*!< in/out: table */
|
|
|
|
/*********************************************************************//**
|
|
Deinitialize table's stats after the last close of the table. This is
|
|
used to detect "FLUSH TABLE" and refresh the stats upon next open. */
|
|
UNIV_INLINE
|
|
void
|
|
dict_stats_deinit(
|
|
/*==============*/
|
|
dict_table_t* table) /*!< in/out: table */
|
|
MY_ATTRIBUTE((nonnull));
|
|
|
|
/** Update the table modification counter and if necessary,
|
|
schedule new estimates for table and index statistics to be calculated.
|
|
@param[in,out] table persistent or temporary table */
|
|
void
|
|
dict_stats_update_if_needed(dict_table_t* table)
|
|
MY_ATTRIBUTE((nonnull));
|
|
|
|
/*********************************************************************//**
|
|
Calculates new estimates for table and index statistics. The statistics
|
|
are used in query optimization.
|
|
@return DB_* error code or DB_SUCCESS */
|
|
dberr_t
|
|
dict_stats_update(
|
|
/*==============*/
|
|
dict_table_t* table, /*!< in/out: table */
|
|
dict_stats_upd_option_t stats_upd_option);
|
|
/*!< in: whether to (re) calc
|
|
the stats or to fetch them from
|
|
the persistent storage */
|
|
|
|
/*********************************************************************//**
|
|
Removes the information for a particular index's stats from the persistent
|
|
storage if it exists and if there is data stored for this index.
|
|
This function creates its own trx and commits it.
|
|
@return DB_SUCCESS or error code */
|
|
dberr_t
|
|
dict_stats_drop_index(
|
|
/*==================*/
|
|
const char* tname, /*!< in: table name */
|
|
const char* iname, /*!< in: index name */
|
|
char* errstr, /*!< out: error message if != DB_SUCCESS
|
|
is returned */
|
|
ulint errstr_sz);/*!< in: size of the errstr buffer */
|
|
|
|
/*********************************************************************//**
|
|
Removes the statistics for a table and all of its indexes from the
|
|
persistent storage if it exists and if there is data stored for the table.
|
|
This function creates its own transaction and commits it.
|
|
@return DB_SUCCESS or error code */
|
|
dberr_t
|
|
dict_stats_drop_table(
|
|
/*==================*/
|
|
const char* table_name, /*!< in: table name */
|
|
char* errstr, /*!< out: error message
|
|
if != DB_SUCCESS is returned */
|
|
ulint errstr_sz); /*!< in: size of errstr buffer */
|
|
|
|
/*********************************************************************//**
|
|
Fetches or calculates new estimates for index statistics. */
|
|
void
|
|
dict_stats_update_for_index(
|
|
/*========================*/
|
|
dict_index_t* index) /*!< in/out: index */
|
|
MY_ATTRIBUTE((nonnull));
|
|
|
|
/*********************************************************************//**
|
|
Renames a table in InnoDB persistent stats storage.
|
|
This function creates its own transaction and commits it.
|
|
@return DB_SUCCESS or error code */
|
|
dberr_t
|
|
dict_stats_rename_table(
|
|
/*====================*/
|
|
const char* old_name, /*!< in: old table name */
|
|
const char* new_name, /*!< in: new table name */
|
|
char* errstr, /*!< out: error string if != DB_SUCCESS
|
|
is returned */
|
|
size_t errstr_sz); /*!< in: errstr size */
|
|
#ifdef MYSQL_RENAME_INDEX
|
|
/*********************************************************************//**
|
|
Renames an index in InnoDB persistent stats storage.
|
|
This function creates its own transaction and commits it.
|
|
@return DB_SUCCESS or error code. DB_STATS_DO_NOT_EXIST will be returned
|
|
if the persistent stats do not exist. */
|
|
dberr_t
|
|
dict_stats_rename_index(
|
|
/*====================*/
|
|
const dict_table_t* table, /*!< in: table whose index
|
|
is renamed */
|
|
const char* old_index_name, /*!< in: old index name */
|
|
const char* new_index_name) /*!< in: new index name */
|
|
__attribute__((warn_unused_result));
|
|
#endif /* MYSQL_RENAME_INDEX */
|
|
|
|
/** Save an individual index's statistic into the persistent statistics
|
|
storage.
|
|
@param[in] index index to be updated
|
|
@param[in] last_update timestamp of the stat
|
|
@param[in] stat_name name of the stat
|
|
@param[in] stat_value value of the stat
|
|
@param[in] sample_size n pages sampled or NULL
|
|
@param[in] stat_description description of the stat
|
|
@param[in,out] trx in case of NULL the function will
|
|
allocate and free the trx object. If it is not NULL then it will be
|
|
rolled back only in the case of error, but not freed.
|
|
@return DB_SUCCESS or error code */
|
|
dberr_t
|
|
dict_stats_save_index_stat(
|
|
dict_index_t* index,
|
|
ib_time_t last_update,
|
|
const char* stat_name,
|
|
ib_uint64_t stat_value,
|
|
ib_uint64_t* sample_size,
|
|
const char* stat_description,
|
|
trx_t* trx);
|
|
|
|
/** Report an error if updating table statistics failed because
|
|
.ibd file is missing, table decryption failed or table is corrupted.
|
|
@param[in,out] table Table
|
|
@param[in] defragment true if statistics is for defragment
|
|
@retval DB_DECRYPTION_FAILED if decryption of the table failed
|
|
@retval DB_TABLESPACE_DELETED if .ibd file is missing
|
|
@retval DB_CORRUPTION if table is marked as corrupted */
|
|
dberr_t
|
|
dict_stats_report_error(dict_table_t* table, bool defragment = false)
|
|
MY_ATTRIBUTE((nonnull, warn_unused_result));
|
|
|
|
#include "dict0stats.ic"
|
|
|
|
#ifdef UNIV_ENABLE_UNIT_TEST_DICT_STATS
|
|
void test_dict_stats_all();
|
|
#endif /* UNIV_ENABLE_UNIT_TEST_DICT_STATS */
|
|
|
|
#endif /* dict0stats_h */
|