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277 lines
9.5 KiB
C
277 lines
9.5 KiB
C
/*****************************************************************************
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Copyright (c) 2007, 2015, Oracle and/or its affiliates. All Rights Reserved.
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Copyright (c) 2017, 2021, MariaDB Corporation.
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This program is free software; you can redistribute it and/or modify it under
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the terms of the GNU General Public License as published by the Free Software
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Foundation; version 2 of the License.
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This program is distributed in the hope that it will be useful, but WITHOUT
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ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.
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You should have received a copy of the GNU General Public License along with
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this program; if not, write to the Free Software Foundation, Inc.,
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51 Franklin Street, Fifth Floor, Boston, MA 02110-1335 USA
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*****************************************************************************/
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/**************************************************//**
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@file include/trx0i_s.h
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INFORMATION SCHEMA innodb_trx, innodb_locks and
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innodb_lock_waits tables cache structures and public
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functions.
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Created July 17, 2007 Vasil Dimov
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*******************************************************/
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#ifndef trx0i_s_h
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#define trx0i_s_h
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#include "trx0types.h"
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#include "dict0types.h"
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#include "buf0types.h"
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/** The maximum amount of memory that can be consumed by innodb_trx,
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innodb_locks and innodb_lock_waits information schema tables. */
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#define TRX_I_S_MEM_LIMIT 16777216 /* 16 MiB */
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/** The maximum length of a string that can be stored in
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i_s_locks_row_t::lock_data */
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#define TRX_I_S_LOCK_DATA_MAX_LEN 8192
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/** The maximum length of a string that can be stored in
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i_s_trx_row_t::trx_query */
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#define TRX_I_S_TRX_QUERY_MAX_LEN 1024
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/** The maximum length of a string that can be stored in
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i_s_trx_row_t::trx_foreign_key_error */
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#define TRX_I_S_TRX_FK_ERROR_MAX_LEN 256
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/** Safely copy strings in to the INNODB_TRX table's
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string based columns */
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#define TRX_I_S_STRING_COPY(data, field, constraint, tcache) \
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do { \
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if (strlen(data) > constraint) { \
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char buff[constraint + 1]; \
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strncpy(buff, data, constraint); \
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buff[constraint] = '\0'; \
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\
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field = static_cast<const char*>( \
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ha_storage_put_memlim( \
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(tcache)->storage, buff, constraint + 1,\
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MAX_ALLOWED_FOR_STORAGE(tcache))); \
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} else { \
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field = static_cast<const char*>( \
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ha_storage_put_str_memlim( \
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(tcache)->storage, data, \
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MAX_ALLOWED_FOR_STORAGE(tcache))); \
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} \
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} while (0)
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/** A row of INFORMATION_SCHEMA.innodb_locks */
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struct i_s_locks_row_t;
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/** Objects of trx_i_s_cache_t::locks_hash */
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struct i_s_hash_chain_t;
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/** Objects of this type are added to the hash table
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trx_i_s_cache_t::locks_hash */
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struct i_s_hash_chain_t {
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i_s_locks_row_t* value; /*!< row of
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INFORMATION_SCHEMA.innodb_locks*/
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i_s_hash_chain_t* next; /*!< next item in the hash chain */
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};
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/** This structure represents INFORMATION_SCHEMA.innodb_locks row */
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struct i_s_locks_row_t {
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trx_id_t lock_trx_id; /*!< transaction identifier */
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const char* lock_table; /*!< table name from
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lock_get_table_name() */
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/** index name of a record lock; NULL for table locks */
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const char* lock_index;
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/** page identifier of the record; (0,0) if !lock_index */
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page_id_t lock_page;
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/** heap number of the record; 0 if !lock_index */
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uint16_t lock_rec;
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/** lock mode corresponding to lock_mode_values_typelib */
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uint8_t lock_mode;
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/** (some) content of the record, if available in the buffer pool;
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NULL if !lock_index */
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const char* lock_data;
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/** The following are auxiliary and not included in the table */
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/* @{ */
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table_id_t lock_table_id;
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/*!< table identifier from
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lock_get_table_id */
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i_s_hash_chain_t hash_chain; /*!< hash table chain node for
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trx_i_s_cache_t::locks_hash */
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/* @} */
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};
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/** This structure represents INFORMATION_SCHEMA.innodb_trx row */
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struct i_s_trx_row_t {
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trx_id_t trx_id; /*!< transaction identifier */
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const char* trx_state;
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time_t trx_started; /*!< trx_t::start_time */
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const i_s_locks_row_t* requested_lock_row;
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/*!< pointer to a row
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in innodb_locks if trx
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is waiting, or NULL */
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time_t trx_wait_started; /*!< trx_t->lock.wait_started */
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uintmax_t trx_weight; /*!< TRX_WEIGHT() */
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ulint trx_mysql_thread_id; /*!< thd_get_thread_id() */
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const char* trx_query; /*!< MySQL statement being
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executed in the transaction */
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CHARSET_INFO* trx_query_cs; /*!< the charset of trx_query */
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const char* trx_operation_state; /*!< trx_t::op_info */
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ulint trx_tables_in_use;/*!< n_mysql_tables_in_use in
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trx_t */
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ulint trx_tables_locked;
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/*!< mysql_n_tables_locked in
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trx_t */
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ulint trx_lock_structs;/*!< list len of trx_locks in
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trx_t */
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ulint trx_lock_memory_bytes;
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/*!< mem_heap_get_size(
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trx->lock_heap) */
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ulint trx_rows_locked;/*!< trx_lock_t::n_rec_locks */
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uintmax_t trx_rows_modified;/*!< trx_t::undo_no */
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uint trx_isolation_level;
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/*!< trx_t::isolation_level */
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bool trx_unique_checks;
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/*!< check_unique_secondary in trx_t*/
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bool trx_foreign_key_checks;
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/*!< check_foreigns in trx_t */
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const char* trx_foreign_key_error;
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/*!< detailed_error in trx_t */
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bool trx_is_read_only;
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/*!< trx_t::read_only */
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bool trx_is_autocommit_non_locking;
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/*!< trx:t::is_autocommit_non_locking()
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*/
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};
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/** This structure represents INFORMATION_SCHEMA.innodb_lock_waits row */
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struct i_s_lock_waits_row_t {
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const i_s_locks_row_t* requested_lock_row; /*!< requested lock */
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const i_s_locks_row_t* blocking_lock_row; /*!< blocking lock */
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};
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/** Cache of INFORMATION_SCHEMA table data */
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struct trx_i_s_cache_t;
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/** Auxiliary enum used by functions that need to select one of the
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INFORMATION_SCHEMA tables */
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enum i_s_table {
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I_S_INNODB_TRX, /*!< INFORMATION_SCHEMA.innodb_trx */
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I_S_INNODB_LOCKS, /*!< INFORMATION_SCHEMA.innodb_locks */
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I_S_INNODB_LOCK_WAITS /*!< INFORMATION_SCHEMA.innodb_lock_waits */
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};
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/** This is the intermediate buffer where data needed to fill the
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INFORMATION SCHEMA tables is fetched and later retrieved by the C++
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code in handler/i_s.cc. */
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extern trx_i_s_cache_t* trx_i_s_cache;
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/*******************************************************************//**
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Initialize INFORMATION SCHEMA trx related cache. */
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void
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trx_i_s_cache_init(
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/*===============*/
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trx_i_s_cache_t* cache); /*!< out: cache to init */
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/*******************************************************************//**
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Free the INFORMATION SCHEMA trx related cache. */
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void
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trx_i_s_cache_free(
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/*===============*/
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trx_i_s_cache_t* cache); /*!< in/out: cache to free */
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/*******************************************************************//**
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Issue a shared/read lock on the tables cache. */
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void
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trx_i_s_cache_start_read(
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/*=====================*/
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trx_i_s_cache_t* cache); /*!< in: cache */
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/*******************************************************************//**
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Release a shared/read lock on the tables cache. */
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void
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trx_i_s_cache_end_read(
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/*===================*/
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trx_i_s_cache_t* cache); /*!< in: cache */
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/*******************************************************************//**
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Issue an exclusive/write lock on the tables cache. */
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void
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trx_i_s_cache_start_write(
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/*======================*/
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trx_i_s_cache_t* cache); /*!< in: cache */
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/*******************************************************************//**
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Release an exclusive/write lock on the tables cache. */
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void
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trx_i_s_cache_end_write(
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/*====================*/
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trx_i_s_cache_t* cache); /*!< in: cache */
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/*******************************************************************//**
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Retrieves the number of used rows in the cache for a given
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INFORMATION SCHEMA table.
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@return number of rows */
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ulint
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trx_i_s_cache_get_rows_used(
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/*========================*/
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trx_i_s_cache_t* cache, /*!< in: cache */
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enum i_s_table table); /*!< in: which table */
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/*******************************************************************//**
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Retrieves the nth row in the cache for a given INFORMATION SCHEMA
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table.
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@return row */
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void*
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trx_i_s_cache_get_nth_row(
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/*======================*/
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trx_i_s_cache_t* cache, /*!< in: cache */
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enum i_s_table table, /*!< in: which table */
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ulint n); /*!< in: row number */
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/*******************************************************************//**
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Update the transactions cache if it has not been read for some time.
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@return 0 - fetched, 1 - not */
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int
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trx_i_s_possibly_fetch_data_into_cache(
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/*===================================*/
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trx_i_s_cache_t* cache); /*!< in/out: cache */
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/*******************************************************************//**
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Returns true, if the data in the cache is truncated due to the memory
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limit posed by TRX_I_S_MEM_LIMIT.
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@return TRUE if truncated */
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bool
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trx_i_s_cache_is_truncated(
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/*=======================*/
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trx_i_s_cache_t* cache); /*!< in: cache */
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/** The maximum length of a resulting lock_id_size in
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trx_i_s_create_lock_id(), not including the terminating NUL.
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":%lu:%lu:%lu" -> 63 chars */
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#define TRX_I_S_LOCK_ID_MAX_LEN (TRX_ID_MAX_LEN + 63)
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/*******************************************************************//**
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Crafts a lock id string from a i_s_locks_row_t object. Returns its
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second argument. This function aborts if there is not enough space in
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lock_id. Be sure to provide at least TRX_I_S_LOCK_ID_MAX_LEN + 1 if you
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want to be 100% sure that it will not abort.
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@return resulting lock id */
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char*
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trx_i_s_create_lock_id(
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/*===================*/
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const i_s_locks_row_t* row, /*!< in: innodb_locks row */
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char* lock_id,/*!< out: resulting lock_id */
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ulint lock_id_size);/*!< in: size of the lock id
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buffer */
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#endif /* trx0i_s_h */
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