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TABLES IN INCORRECT ENGINE PROBLEM: CREATE/ALTER TABLE currently can move system tables like mysql.db, user, host etc, to engines other than MyISAM. This is not completely supported as of now, by mysqld. When some of system tables like plugin, servers, event, func, *_priv, time_zone* are moved to innodb, mysqld restart crashes. Currently system tables can be moved to BLACKHOLE also!!!. ANALYSIS: The problem is that there is no check before creating or moving a system table to some particular engine. System tables are suppose to be residing in MyISAM. We can think of restricting system tables to exist only in MyISAM. But, there could be future needs of these system tables to be part of other engines by design. For eg, NDB cluster expects some tables to be on innodb or ndb engine. This calls for a solution, by which system tables can be supported by any desired engine, with minimal effort. FIX: The solution provides a handlerton interface using which, mysqld server can query particular storage engine handlerton for system tables that it supports. This way each storage engine layer can define their own system database and system tables. The check_engine() function uses the new handlerton function ha_check_if_supported_system_table() to check if db.tablename provided in the DDL is supported by the SE. Note: This fix has modified a test in help.test, which was moving mysql.help_* to innodb. The primary intention of the test was not to move them between engines.
138 lines
5.6 KiB
Text
138 lines
5.6 KiB
Text
# category: topic: keyword:
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#
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# impossible_category_1
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# impossible_function_1
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# impossible_function_5
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# impossible_function_2
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# impossible_function_1
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# impossible_category_2
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# impossible_function_3
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# impossible_function_6
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# impossible_function_4
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# impossible_function_6
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# impossible_category_3
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# impossible_function_7
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insert into mysql.help_category(help_category_id,name)values(10001,'impossible_category_1');
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select @category1_id:= 10001;
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insert into mysql.help_category(help_category_id,name)values(10002,'impossible_category_2');
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select @category2_id:= 10002;
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insert into mysql.help_category(help_category_id,name,parent_category_id)values(10003,'impossible_category_3',@category2_id);
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select @category3_id:= 10003;
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insert into mysql.help_topic(help_topic_id,name,help_category_id,description,example)values(10101,'impossible_function_1',@category1_id,'description of \n impossible_function1\n','example of \n impossible_function1');
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select @topic1_id:= 10101;
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insert into mysql.help_topic(help_topic_id,name,help_category_id,description,example)values(10102,'impossible_function_2',@category1_id,'description of \n impossible_function2\n','example of \n impossible_function2');
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select @topic2_id:= 10102;
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insert into mysql.help_topic(help_topic_id,name,help_category_id,description,example)values(10103,'impossible_function_3',@category2_id,'description of \n impossible_function3\n','example of \n impossible_function3');
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select @topic3_id:= 10103;
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insert into mysql.help_topic(help_topic_id,name,help_category_id,description,example)values(10104,'impossible_function_4',@category2_id,'description of \n impossible_function4\n','example of \n impossible_function4');
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select @topic4_id:= 10104;
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insert into mysql.help_topic(help_topic_id,name,help_category_id,description,example)values(10105,'impossible_function_7',@category3_id,'description of \n impossible_function5\n','example of \n impossible_function7');
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select @topic5_id:= 10105;
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insert into mysql.help_keyword(help_keyword_id,name)values(10201,'impossible_function_1');
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select @keyword1_id:= 10201;
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insert into mysql.help_keyword(help_keyword_id,name)values(10202,'impossible_function_5');
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select @keyword2_id:= 10202;
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insert into mysql.help_keyword(help_keyword_id,name)values(10203,'impossible_function_6');
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select @keyword3_id:= 10203;
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insert into mysql.help_relation(help_keyword_id,help_topic_id)values(@keyword1_id,@topic2_id);
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insert into mysql.help_relation(help_keyword_id,help_topic_id)values(@keyword2_id,@topic1_id);
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insert into mysql.help_relation(help_keyword_id,help_topic_id)values(@keyword3_id,@topic3_id);
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insert into mysql.help_relation(help_keyword_id,help_topic_id)values(@keyword3_id,@topic4_id);
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##############
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help 'function_of_my_dream';
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help '%possible_f%';
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help 'impossible_func%';
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help 'impossible_category%';
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help 'impossible_%';
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help '%function_1';
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help '%function_2';
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help '%function_3';
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help '%function_4';
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help '%function_5';
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help '%function_6';
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help '%function_7';
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help '%category_2';
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help 'impossible_function_1';
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help 'impossible_category_1';
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##############
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--disable_warnings
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alter table mysql.help_relation engine=innodb;
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alter table mysql.help_keyword engine=innodb;
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alter table mysql.help_topic engine=innodb;
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alter table mysql.help_category engine=innodb;
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--enable_warnings
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##############
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help 'function_of_my_dream';
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help '%possible_f%';
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help 'impossible_func%';
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help 'impossible_category%';
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help 'impossible_%';
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help '%function_1';
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help '%function_2';
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help '%function_3';
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help '%function_4';
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help '%function_5';
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help '%function_6';
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help '%function_7';
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help '%category_2';
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help 'impossible_function_1';
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help 'impossible_category_1';
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##############
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alter table mysql.help_relation engine=myisam;
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alter table mysql.help_keyword engine=myisam;
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alter table mysql.help_topic engine=myisam;
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alter table mysql.help_category engine=myisam;
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delete from mysql.help_topic where help_topic_id=@topic1_id;
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delete from mysql.help_topic where help_topic_id=@topic2_id;
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delete from mysql.help_topic where help_topic_id=@topic3_id;
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delete from mysql.help_topic where help_topic_id=@topic4_id;
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delete from mysql.help_topic where help_topic_id=@topic5_id;
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delete from mysql.help_category where help_category_id=@category3_id;
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delete from mysql.help_category where help_category_id=@category2_id;
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delete from mysql.help_category where help_category_id=@category1_id;
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delete from mysql.help_keyword where help_keyword_id=@keyword1_id;
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delete from mysql.help_keyword where help_keyword_id=@keyword2_id;
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delete from mysql.help_keyword where help_keyword_id=@keyword3_id;
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delete from mysql.help_relation where help_keyword_id=@keyword1_id and help_topic_id=@topic2_id;
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delete from mysql.help_relation where help_keyword_id=@keyword2_id and help_topic_id=@topic1_id;
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delete from mysql.help_relation where help_keyword_id=@keyword3_id and help_topic_id=@topic3_id;
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delete from mysql.help_relation where help_keyword_id=@keyword3_id and help_topic_id=@topic4_id;
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--echo End of 4.1 tests.
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#
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# Test that we can use HELP even under LOCK TABLES. See bug#9953:
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# CONVERT_TZ requires mysql.time_zone_name to be locked.
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#
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--disable_warnings
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DROP TABLE IF EXISTS t1;
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--enable_warnings
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CREATE TABLE t1 (i INT);
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LOCK TABLES t1 WRITE;
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HELP no_such_topic;
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UNLOCK TABLES;
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DROP TABLE t1;
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--echo End of 5.1 tests.
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