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9ff272fbbd
DATABASE with open HANDLER" Remove LOCK_create_db, database name locks, and use metadata locks instead. This exposes CREATE/DROP/ALTER DATABASE statements to the graph-based deadlock detector in MDL, and paves the way for a safe, deadlock-free implementation of RENAME DATABASE. Database DDL statements will now take exclusive metadata locks on the database name, while table/view/routine DDL statements take intention exclusive locks on the database name. This prevents race conditions between database DDL and table/view/routine DDL. (e.g. DROP DATABASE with concurrent CREATE/ALTER/DROP TABLE) By adding database name locks, this patch implements WL#4450 "DDL locking: CREATE/DROP DATABASE must use database locks" and WL#4985 "DDL locking: namespace/hierarchical locks". The patch also changes code to use init_one_table() where appropriate. The new lock_table_names() function requires TABLE_LIST::db_length to be set correctly, and this is taken care of by init_one_table(). This patch also adds a simple template to help work with the mysys HASH data structure. Most of the patch was written by Konstantin Osipov.
50 lines
2.1 KiB
C++
50 lines
2.1 KiB
C++
/* Copyright 2006-2008 MySQL AB, 2008-2009 Sun Microsystems, Inc.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; version 2 of the License.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA */
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#ifndef SQL_DB_INCLUDED
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#define SQL_DB_INCLUDED
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#include "hash.h" /* HASH */
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class THD;
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typedef struct charset_info_st CHARSET_INFO;
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typedef struct st_ha_create_information HA_CREATE_INFO;
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typedef struct st_mysql_lex_string LEX_STRING;
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int mysql_create_db(THD *thd, char *db, HA_CREATE_INFO *create, bool silent);
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bool mysql_alter_db(THD *thd, const char *db, HA_CREATE_INFO *create);
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bool mysql_rm_db(THD *thd,char *db,bool if_exists, bool silent);
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bool mysql_upgrade_db(THD *thd, LEX_STRING *old_db);
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bool mysql_change_db(THD *thd, const LEX_STRING *new_db_name,
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bool force_switch);
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bool mysql_opt_change_db(THD *thd,
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const LEX_STRING *new_db_name,
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LEX_STRING *saved_db_name,
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bool force_switch,
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bool *cur_db_changed);
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bool my_dboptions_cache_init(void);
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void my_dboptions_cache_free(void);
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bool check_db_dir_existence(const char *db_name);
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bool load_db_opt(THD *thd, const char *path, HA_CREATE_INFO *create);
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bool load_db_opt_by_name(THD *thd, const char *db_name,
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HA_CREATE_INFO *db_create_info);
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CHARSET_INFO *get_default_db_collation(THD *thd, const char *db_name);
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bool my_dbopt_init(void);
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void my_dbopt_cleanup(void);
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#define MY_DB_OPT_FILE "db.opt"
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#endif /* SQL_DB_INCLUDED */
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