查看：
select con_id, dbid, guid, name , open_mode from v$pdbs;
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修改状态
alter pluggable database pdbsde close;
alter pluggable database pdbsde open;
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删除pdb
DROP PLUGGABLE DATABASE pdbsde2 INCLUDING DATAFILES
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参考：https://blog.csdn.net/WangjingSharp/article/details/53415047
