Object too large to fit in memory
元数据对象（如非常大的包体或视图定义）过大，无法在可用内存中被 Data Pump 处理。
SELECT owner, name, type, SUM(LENGTH(text)) total_chars FROM dba_source GROUP BY owner, name, type HAVING SUM(LENGTH(text)) > 1000000 ORDER BY total_chars DESC;SELECT * FROM v$pgastat WHERE name LIKE '%aggregate%';