What LOB index is really

Hi friends!

I have a very simple question. I was a little confused, read the docs on oracle 11g. I don't remember the exact number of topic, but it was working with LOB data types. So in the first statement, they say that when the null value is assigned to a LOB field this field is no clue, is not possible to extract it and use in some plsql block to associate the field with lob data. In the same paragraph, they say that if using empty_blob rather for purposes of initialization, we can get later inside the plsql block and bind it to some data.

On this subject a bit down the text it is said that there is always a hint of any value has been assigned to the field: null, empty_blob or other. How can it be? If a Web address must be thinking as a pointer, then what region it references after you have created with the emp_LOB method?

Thank you.

Timin wrote:
Please look at the first paragraph and find the note that includes the following:

A LOB Locator still exists for any instance LOB regardless of the properties of LOB storage or LOB - NULL, empty, or another value.

I think the confusion is where he uses the word "instance". If you have stored a NULL value in the column, then it isn't actually an instance of a LOB it. Instance exist that once there is an empty lob or a lob with data in it, in which case it will be the lob Locator.

Tags: Database

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T2192                                       21.8 TABLE
SYS_LOB0000077549C00015$$                    182 LOBSEGMENT   <=== (related to table T2192)
SYS_LOB0000077549C00016$$                  184.4 LOBSEGMENT  <=== (related to table T2192)

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TABLE_NAME                       COLUMN_NAME                      SEGMENT_NAME
-------------------------------- -------------------------------- --------------------------------
B1947C536880923                  C536880923                       SYS_LOB0000077310C00002$$
T2051                            C536870998                       SYS_LOB0000077426C00041$$
T2052                            C536870987                       SYS_LOB0000077440C00063$$
T2115                            C536870913                       SYS_LOB0000077463C00009$$
B2125C536880912                  C536880912                       SYS_LOB0000077480C00002$$
B2125C536880913                  C536880913                       SYS_LOB0000077483C00002$$
T2179                            C536870936                       SYS_LOB0000077517C00027$$
T2192                            C456                             SYS_LOB0000077549C00015$$   <====
T2192                            C459                             SYS_LOB0000077549C00016$$   <====
T2444                            C536870936                       SYS_LOB0000210343C00029$$
T1990                            C536870937                       SYS_LOB0000250271C00026$$

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