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InnoDB problem on MySQL - table does not exist

+1 vote

I've restored an MySQL backup from our MySQL server into another server. The backup includes InnoDB tables. After the import, MySQL recognized the innodb tables fine but when I try to do a check table it returns that the table doesn't exists.

Permission and owner of the table files (.frm files) are ok, since it recognizes MyISAM tables (they have the same permission). Innodb engine is enabled..

Which can cause the tables to appears as "non existent", as far as they do really exist?

posted Jul 22, 2013 by anonymous

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1 Answer

+1 vote

You should always read the fine manual.

You took file-level backups, yes? Did they include the ibdata1 and similar files? Those contain innodb's dictionary - and in default installs also all the actual tables. The database/* files only contain the .frm, for innodb.

If I'm right, you haven't got a backup at all. I'm crossing my fingers that I'm wrong...

answer Jul 22, 2013 by anonymous
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Below table contains billion of rows,

CREATE TABLE `Sample1` (
  `c1` bigint(20) NOT NULL AUTO_INCREMENT,
  `c2` varchar(45) NOT NULL,
  `c3` tinyint(4) DEFAULT NULL,
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Four multi column index created because having below conditions in where

1) c2 and time
2) c2 and c3 and time
3) c2 and c4 and time
4) c2 and c3 and c4 and time

Cardinality wise c2, c3 and c4 are very low. (ex: Out of one million c2, c3 and c4 have 50 unique column in each)

Column time contains mostly unique fields.

Select, insert and update happened frequently.

Tables has 5 indexing fields(4 multi column). Due to this, 1) Insert and update on index fields become costlier. 2) As the table keep on growing (Nearly one billion rows), Index size also increase more rapidly.

Kindly suggest good approach in mysql to solve this use case.

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