What does a value of 5 in "SYSIDX.unique" mean?

The SYSIDX system view has a column "unique" that classifies the logical index as follows:

Indicates whether the index is a unique index (1), a non-unique index (4), or a unique constraint (2). A unique index prevents two rows in the indexed table from having the same values in the index columns

What does a value of 5 mean? An unique index with the new "CREATE INDEX ... WITH NULLS NOT DISTINCT" clause?

(At least that seems to be the case in my tests...)

asked 22 May '12, 07:58

Volker Barth
40.2k●361●549●822
accept rate: 34%

edited 23 May '12, 03:22

flat view

One Answer:

active answers oldest answers newest answers popular answers

You are correct. The values are:

1 - index is a unique index
2 - index is for a UNIQUE constraint
3 - reserved
4 - index is not unique
5 - index is WITH NULLS NOT DISTINCT

I will make sure that the documentation is modified appropriately. Thanks for reporting the oversight.

permanent link

answered 22 May '12, 17:29

Glenn Paulley
10.8k●5●76●106
accept rate: 43%

I may be hairsplitting but for the docs, I guess the description for values 1 and 5 should be worded differently as both are for unique indizes, such as:

1 - index is a unique index (not declared WITH NULLS NOT DISTINCT)
5 - index is a unique index WITH NULLS NOT DISTINCT

(Apparently, that would only make sense for v12 and above...)

(23 May '12, 03:21) Volker Barth

flat view

Your answer

toggle preview

community wiki:

Follow this question

By Email:

Once you sign in you will be able to subscribe for any updates here

By RSS:

Answers

Answers and Comments

Markdown Basics

*italic* or _italic_
**bold** or __bold__
link:[text](http://url.com/ "title")
image?![alt text](/path/img.jpg "title")
numbered list: 1. Foo 2. Bar
to add a line break simply add two spaces to where you would like the new line to be.
basic HTML tags are also supported

learn more about Markdown

Question tags:

sa-12 ×438
documentation ×93
index ×32
system-tables ×32

question asked: 22 May '12, 07:58

question was seen: 2,373 times

last updated: 23 May '12, 03:22

SAP SQL Anywhere

What does a value of 5 in "SYSIDX.unique" mean?

Follow this question

Related questions