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149c993b2c
disable online alter add primary key for innodb, if the table is opened/locked more than once in the current connection (see assert in ha_innobase::add_index())
25 lines
667 B
Plaintext
25 lines
667 B
Plaintext
create table t1 (a int not null, b int not null) engine=innodb;
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insert t1 values (1,2),(3,4);
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lock table t1 write, t1 tr read;
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flush status;
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alter table t1 add primary key (b);
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show status like 'Handler_read_rnd_next';
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Variable_name Value
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Handler_read_rnd_next 3
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unlock tables;
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alter table t1 drop primary key;
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lock table t1 write;
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flush status;
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alter table t1 add primary key (b);
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show status like 'Handler_read_rnd_next';
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Variable_name Value
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Handler_read_rnd_next 0
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unlock tables;
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alter table t1 drop primary key;
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flush status;
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alter table t1 add primary key (b);
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show status like 'Handler_read_rnd_next';
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Variable_name Value
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Handler_read_rnd_next 0
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drop table t1;
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