Unable to read data - table definition has changed
闪回查询或 AS OF TIMESTAMP 查询失败，因为表结构（DDL）在指定时间戳和当前时间之间被修改。
SELECT scn_to_timestamp(ora_rowscn) last_modified FROM table_name WHERE ROWNUM = 1;SELECT * FROM dba_tab_modifications WHERE table_name = 'TABLE_NAME';SELECT timestamp, action FROM dba_tab_stats_history WHERE table_name = 'TABLE_NAME' ORDER BY timestamp DESC;