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While doing a tablespace import I noticed the following error when imported a few tables:
This is an example with a given table:
Schema mismatch (Column exptime precise type mismatch.)
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This is the table
CREATE TABLE `objectcache_bkup` (
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`keyname` varbinary(255) NOT NULL DEFAULT '',
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`value` mediumblob,
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`exptime` datetime DEFAULT NULL,
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`test` int(11) DEFAULT NULL,
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UNIQUE KEY `keyname` (`keyname`),
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KEY `exptime` (`exptime`)
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) ENGINE=InnoDB DEFAULT CHARSET=binary
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The table was of course the same on the source and the target.
I noticed that the table was using the old timestamp format http://mechanics.flite.com/blog/2014/05/01/upgrading-temporal-columns-from-mysql-5-dot-5-to-mysql-5-dot-6-format/:
select t.table_schema,t.engine,t.table_name,c.column_name,c.column_type from information_schema.tables t inner join information_schema.columns c on c.table_schema = t.table_schema and c.table_name = t.table_name left outer join information_schema.innodb_sys_tables ist on ist.name = concat(t.table_schema,'/',t.table_name) left outer join information_schema.innodb_sys_columns isc on isc.table_id = ist.table_id and isc.name = c.column_name where c.column_type in ('time','timestamp','datetime') and t.table_schema not in ('mysql','information_schema','performance_schema', 'ops', 'sys') and t.table_type = 'base table' and (t.engine != 'innodb' or (t.engine = 'innodb' and isc.mtype = 6)) order by t.table_schema,t.table_name,c.column_name;
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+--------------+--------+-------------------+-------------+-------------+
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| table_schema | engine | table_name | column_name | column_type |
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+--------------+--------+-------------------+-------------+-------------+
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| test | InnoDB | objectcache | exptime | datetime |
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+--------------+--------+-------------------+-------------+-------------+
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1 rows in set (0.01 sec)
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I assumed rebuilding the table would work as it does on MySQL (I have faced this before with MySQL but not with MariaDB), but it looks like it doesn't work.
MariaDB [test]> alter table objectcache engine = innodb, force;
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Query OK, 0 rows affected (0.01 sec)
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Records: 0 Duplicates: 0 Warnings: 0
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MariaDB [test]> select t.table_schema,t.engine,t.table_name,c.column_name,c.column_type from information_schema.tables t inner join information_schema.columns c on c.table_schema = t.table_schema and c.table_name = t.table_name left outer join information_schema.innodb_sys_tables ist on ist.name = concat(t.table_schema,'/',t.table_name) left outer join information_schema.innodb_sys_columns isc on isc.table_id = ist.table_id and isc.name = c.column_name where c.column_type in ('time','timestamp','datetime') and t.table_schema not in ('mysql','information_schema','performance_schema', 'ops', 'sys') and t.table_type = 'base table' and (t.engine != 'innodb' or (t.engine = 'innodb' and isc.mtype = 6)) order by t.table_schema,t.table_name,c.column_name;
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+--------------+--------+-------------+-------------+-------------+
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| table_schema | engine | table_name | column_name | column_type |
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+--------------+--------+-------------+-------------+-------------+
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| test | InnoDB | objectcache | exptime | datetime |
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+--------------+--------+-------------+-------------+-------------+
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1 row in set (0.02 sec)
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MariaDB [test]> alter table objectcache algorithm=copy;
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Query OK, 0 rows affected (0.00 sec)
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Records: 0 Duplicates: 0 Warnings: 0
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MariaDB [test]> select t.table_schema,t.engine,t.table_name,c.column_name,c.column_type from information_schema.tables t inner join information_schema.columns c on c.table_schema = t.table_schema and c.table_name = t.table_name left outer join information_schema.innodb_sys_tables ist on ist.name = concat(t.table_schema,'/',t.table_name) left outer join information_schema.innodb_sys_columns isc on isc.table_id = ist.table_id and isc.name = c.column_name where c.column_type in ('time','timestamp','datetime') and t.table_schema not in ('mysql','information_schema','performance_schema', 'ops', 'sys') and t.table_type = 'base table' and (t.engine != 'innodb' or (t.engine = 'innodb' and isc.mtype = 6)) order by t.table_schema,t.table_name,c.column_name;
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+--------------+--------+-------------+-------------+-------------+
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| table_schema | engine | table_name | column_name | column_type |
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+--------------+--------+-------------+-------------+-------------+
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| test | InnoDB | objectcache | exptime | datetime |
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+--------------+--------+-------------+-------------+-------------+
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1 row in set (0.02 sec)
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MariaDB [test]> alter table objectcache add column test int;
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Query OK, 0 rows affected (0.02 sec)
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Records: 0 Duplicates: 0 Warnings: 0
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MariaDB [test]> select t.table_schema,t.engine,t.table_name,c.column_name,c.column_type from information_schema.tables t inner join information_schema.columns c on c.table_schema = t.table_schema and c.table_name = t.table_name left outer join information_schema.innodb_sys_tables ist on ist.name = concat(t.table_schema,'/',t.table_name) left outer join information_schema.innodb_sys_columns isc on isc.table_id = ist.table_id and isc.name = c.column_name where c.column_type in ('time','timestamp','datetime') and t.table_schema not in ('mysql','information_schema','performance_schema', 'ops', 'sys') and t.table_type = 'base table' and (t.engine != 'innodb' or (t.engine = 'innodb' and isc.mtype = 6)) order by t.table_schema,t.table_name,c.column_name;
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+--------------+--------+-------------+-------------+-------------+
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| table_schema | engine | table_name | column_name | column_type |
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+--------------+--------+-------------+-------------+-------------+
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| test | InnoDB | objectcache | exptime | datetime |
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+--------------+--------+-------------+-------------+-------------+
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1 row in set (0.02 sec)
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On 10.0.28 I decided to mysqldump the table, drop it and created it again. This didn't work.
On 10.1.19 That does work. Take a mysqldump and reimport the table works.
MariaDB [test]> rename table objectcache to objectcache_bkup;
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Query OK, 0 rows affected (0.01 sec)
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MariaDB [test]> source objectcache.sql;
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<snip>
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MariaDB [test]> select t.table_schema,t.engine,t.table_name,c.column_name,c.column_type from information_schema.tables t inner join information_schema.columns c on c.table_schema = t.table_schema and c.table_name = t.table_name left outer join information_schema.innodb_sys_tables ist on ist.name = concat(t.table_schema,'/',t.table_name) left outer join information_schema.innodb_sys_columns isc on isc.table_id = ist.table_id and isc.name = c.column_name where c.column_type in ('time','timestamp','datetime') and t.table_schema not in ('mysql','information_schema','performance_schema', 'ops', 'sys') and t.table_type = 'base table' and (t.engine != 'innodb' or (t.engine = 'innodb' and isc.mtype = 6)) order by t.table_schema,t.table_name,c.column_name;
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+--------------+--------+------------------+-------------+-------------+
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| table_schema | engine | table_name | column_name | column_type |
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+--------------+--------+------------------+-------------+-------------+
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| test | InnoDB | objectcache_bkup | exptime | datetime |
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+--------------+--------+------------------+-------------+-------------+
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1 row in set (0.02 sec)
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Obviously taking a mysqldump is a big blocker if we are talking about a replication environment and big tables.
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