How to check if the deduplication works correctly

Hi all
I understand that deduplication securefile is for the same column. Suppose if I have 2 identical data in a column, say one, with the size of 4000 bytes, the deduplication makes stores only 4000 bytes instead of 8 000 bytes table. From sqlplus, how can I check if this particular column takes only space to 4000 bytes instead of 8000?

Kind regards
Val

Valerie Debonair wrote:

How can I check if this particular column takes only space to 4000 bytes instead of 8000?

You can't exactly check without looking at the discharge of the LOB segment. It is easier to just check LOG segment does not increase when you insert the same LOB values:

SQL> DROP TABLE T1
  2  /

Table dropped.

SQL> CREATE TABLE t1(
  2                  C CLOB
  3                 )
  4    LOB(C) STORE AS SECUREFILE
  5  /

Table created.

SQL> SELECT  SEGMENT_NAME
  2    FROM  USER_LOBS
  3    WHERE TABLE_NAME = 'T1'
  4      AND COLUMN_NAME = 'C'
  5  /

SEGMENT_NAME
------------------------------
SYS_LOB0000077372C00001$$

SQL> INSERT
  2    INTO T1
  3    SELECT  LPAD('A',10000,'A')
  4      FROM  DUAL
  5  /

1 row created.

SQL> COMMIT
  2  /

Commit complete.

SQL> SELECT  BYTES
  2    FROM  USER_SEGMENTS
  3    WHERE SEGMENT_NAME = 'SYS_LOB0000077372C00001$$'
  4  /

     BYTES
----------
   1245184

SQL> INSERT
  2    INTO T1
  3    SELECT  LPAD('A',10000,'A')
  4      FROM  DUAL
  5      CONNECT BY LEVEL <= 100
  6  /

100 rows created.

SQL> COMMIT
  2  /

Commit complete.

SQL> SELECT  BYTES
  2    FROM  USER_SEGMENTS
  3    WHERE SEGMENT_NAME = 'SYS_LOB0000077372C00001$$'
  4  /

     BYTES
----------
   2293760

SQL> DROP TABLE T1
  2  /

Table dropped.

SQL> CREATE TABLE t1(
  2                  C CLOB
  3                 )
  4    LOB(C) STORE AS SECUREFILE(
  5                               DEDUPLICATE
  6                              )
  7  /

Table created.

SQL> SELECT  SEGMENT_NAME
  2    FROM  USER_LOBS
  3    WHERE TABLE_NAME = 'T1'
  4      AND COLUMN_NAME = 'C'
  5  /

SEGMENT_NAME
------------------------------
SYS_LOB0000077375C00001$$

SQL> INSERT
  2    INTO T1
  3    SELECT  LPAD('A',10000,'A')
  4      FROM  DUAL
  5  /

1 row created.

SQL> COMMIT
  2  /

Commit complete.

SQL> SELECT  BYTES
  2    FROM  USER_SEGMENTS
  3    WHERE SEGMENT_NAME = 'SYS_LOB0000077375C00001$$'
  4  /

     BYTES
----------
   1179648

SQL> INSERT
  2    INTO T1
  3    SELECT  LPAD('A',10000,'A')
  4      FROM  DUAL
  5      CONNECT BY LEVEL <= 100
  6  /

100 rows created.

SQL> COMMIT
  2  /

Commit complete.

SQL> SELECT  BYTES
  2    FROM  USER_SEGMENTS
  3    WHERE SEGMENT_NAME = 'SYS_LOB0000077375C00001$$'
  4  /

     BYTES
----------
   1179648

SQL>

SY.

Tags: Database

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