Steps to modify LOB storage 
1. Find the LOB owner according to the error from init.ora:
ORA-1693: max # extents 505 reached in lobsegment APPLSYS.SYS_LOBXXXXXXXXXXXXXXXX$$
sqlplus system/select owner, table_name, column_name from dba_lobs where segment_name = 'SYS_LOBXXXXXXXXXXXXXXXX$$'; exit;
2. Modify LOB maxextents
sqlplus system/alter table . modify lob ( ) (STORAGE (MAXEXTENTS UNLIMITED)); exit;
3. Example:
ORA-1693: max # extents 505 reached in lobsegment APPLSYS.SYS_LOB0000255319C00040$$
sqlplus system
select owner, table_name, column_name
from dba_lobs
where segment_name = 'SYS_LOB0000255319C00040$$';
OWNER TABLE_NAME COLUMN_NAME ------------------------------ -------------------- ---------------------------- APPLSYS WF_NOTIFICATION_OUT "USER_DATA"."TEXT_LOB"
sqlplus system
alter table APPLSYS.WF_NOTIFICATION_OUT modify lob ("USER_DATA"."TEXT_LOB") (STORAGE (MAXEXTENTS UNLIMITED));
来自 “ ITPUB博客 ” ，链接：https://blog.itpub.net/15149581/viewspace-676448/ ，如需转载，请注明出处，否则将追究法律责任。
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转：oracle 索引
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