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Hi,

I have a mariadb "big" table to process: 20.000.000 records,

CREATE TABLE `eidtmp20172` (
`CARDID` int(11) NOT NULL,
`SOFTREF` varchar(45) NOT NULL,
`ENTRYDATE` datetime NOT NULL,
PRIMARY KEY (`SOFTREF`,`ENTRYDATE`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8;

(there are max 5 entryDate values for each softref, most softref have only one entrydate value.

TUniQuery:
SELECT cardId, softRef, entryDate
FROM EIDtmp20172
ORDER BY softRef,cardId,entryDate;
FetchAll is disabled and unidirectional is true. Fetchrows is 1000, but Open() takes several minutes. Why why why?

Most likely, the execution of your query on the server takes most of the time, but not the data transfer to the client. Please check the execution time of your query on the server using the standard means, for example, MySQL Workbench.