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The problem was that TRUNCATE TABLE didn't take a exclusive lock on a table if it resorted to truncating via delete of all rows in the table. Specifically for InnoDB tables, this could break proper isolation as InnoDB ends up aborting some granted locks when truncating a table. The solution is to take a exclusive metadata lock before TRUNCATE TABLE can proceed. This guarantees that no other transaction is using the table. Incompatible change: Truncate via delete no longer fails if sql_safe_updates is activated (this was a undocumented side effect).
40 lines
1.3 KiB
C
40 lines
1.3 KiB
C
#ifndef DATADICT_INCLUDED
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#define DATADICT_INCLUDED
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/* Copyright (c) 2010, Oracle and/or its affiliates. All rights reserved.
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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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#include "handler.h"
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/*
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Data dictionary API.
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*/
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enum frm_type_enum
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{
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FRMTYPE_ERROR= 0,
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FRMTYPE_TABLE,
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FRMTYPE_VIEW
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};
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frm_type_enum dd_frm_type(THD *thd, char *path, enum legacy_db_type *dbt);
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bool dd_check_storage_engine_flag(THD *thd,
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const char *db, const char *table_name,
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uint32 flag,
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bool *yes_no);
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bool dd_recreate_table(THD *thd, const char *db, const char *table_name);
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#endif // DATADICT_INCLUDED
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