Oracle Database LOB increases untypical An Oracle 12c production database includes tables with a BLOB column. Usually the growth rate is 2GB per week. This is the table create statement:

CREATE TABLE XXX.FILEENTRY
(
  FILENAME     VARCHAR2(300 CHAR),
  FILESIZE     NUMBER(20),
  FILECONTENT  BLOB
)
LOB (FILECONTENT) STORE AS SECUREFILE (
  TABLESPACE  DATA
  ENABLE      STORAGE IN ROW
  CHUNK       8192
  CACHE
  LOGGING
      STORAGE    (
                  INITIAL          104K
                  NEXT             1M
                  MINEXTENTS       1
                  MAXEXTENTS       UNLIMITED
                  PCTINCREASE      0
                  BUFFER_POOL      DEFAULT
                 ))
TABLESPACE DATA
PCTUSED    0
PCTFREE    10
INITRANS   1
MAXTRANS   255
STORAGE    (
            INITIAL          64K
            NEXT             1M
            MAXSIZE          UNLIMITED
            MINEXTENTS       1
            MAXEXTENTS       UNLIMITED
            PCTINCREASE      0
            BUFFER_POOL      DEFAULT
           )
LOGGING 
NOCOMPRESS 
NOCACHE
MONITORING;


Since some days the LOB increases up to 100GB a day. The LOB which increases that fast is: SYS_LOB0000119621C00011$$:

Owner,Segment name,Segment size (GB)
xxx,FILEENTRY,1,8
xxx,SYS_LOB0000119621C00011$$, 1156,1


The application has a transfer table which only shows the usual input of about 2GB a week. What could be the reason for this growth if this is not coming from the users? Is there a way to check the content of SYS_LOB0000119621C00011$$?
Is there a way to check the content of SYS_LOB0000119621C00011$$?


Yes you can first look at dba_lobs view to check which table/column is associated with this segment.


  What could be the reason for this growth if this is not coming from
  the users?


Maybe one huge file has been inserted in your table. You can use DBMS_LOB.GETLENGTH(column_name) to find the size of each lob.

select filename, DBMS_LOB.GETLENGTH(filecontent) from fileentry order by 2;