【DB笔试面试208】在Oracle中，如何快速计算事务的时间与日志量？

Q 题目如下所示：

在Oracle中，如何快速计算事务的时间与日志量？

A 答案如下所示：

答案：脚本如下所示：

DECLARE

start_time NUMBER;

end_time NUMBER;

start_redo_size NUMBER;

end_redo_size NUMBER;

BEGIN

start_time := dbms_utility.get_time;

SELECT VALUE INTO start_redo_size FROM v$mystat m,v$statname s

WHERE m.STATISTIC#=s.STATISTIC#

AND s.NAME='redo size';

--transaction start

INSERT INTO t1

SELECT * FROM All_Objects;

--other dml statement

COMMIT;

end_time := dbms_utility.get_time;

SELECT VALUE INTO end_redo_size FROM v$mystat m,v$statname s

WHERE m.STATISTIC#=s.STATISTIC#

AND s.NAME='redo size';

dbms_output.put_line('Escape Time:'||to_char(end_time-start_time)||' centiseconds');

dbms_output.put_line('Redo Size:'||to_char(end_redo_size-start_redo_size)||' bytes');

END;

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