execdbms_stats.alter_stats_history_retention(0);
清除统计信息:
execDBMS_STATS.PURGE_STATS(systimestamp);
selectcount(*) from SYS.WRI$_OPTSTAT_HISTGRM_HISTORY;
css.sh -the actual character set conversion checker ( creates dbcheck.* files)
run_conv.sql- steps to run the conversion
Csscan\"sys/
导入没有转换的数据:
impdpfull=n tables=metadata.log_request dumpfile=convert.dmp logfile=meta.logtable_exists_action=append
摘自 henrybai的专栏