Re: Re: access method xxx does not exist

["jacktby@xxxxxxxxx" <jacktby@xxxxxxxxx>]

No , that's not what I want, I'm not try to use an exsited index in pg15, I'm tring to build a new index by myself. Can you give me metrials to study it?

 

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jacktby@xxxxxxxxx

 

From: Peter J. Holzer

Date: 2022-10-29 20:00

To: pgsql-general

Subject: Re: access method xxx does not exist

On 2022-10-29 19:19:28 +0800, jacktby@xxxxxxxxx wrote:

> I'm trying to add a new index, but when I finish it, I use “ create index

> xxx_index on t1 using xxx(a); ”,it gives me access method "my_index" does not

> exist

> And I don't know where this message is from, can you grve me its position?

See https://www.postgresql.org/docs/current/sql-createindex.html

The syntax for CREATE INDEX is

CREATE INDEX ON table_name [ USING method ] ( column_name ... )

You use USING to specify the method (e.g. btree or gin), not the table

and/or columns. The columns (or expressions come in parentheses after

that.

So if you wanted an index on column a of table t1 you would simply

write:

CREATE INDEX ON t1 (a);

Or if you have a function xxx and you want a function based index on

xxx(a) of that table:

CREATE INDEX ON t1 (xxx(a));

(You can specify the name of the index, but why would you?)

> I do like this. I add oid in pg_am.dat and pg_proc.dat for my index.

> And I add codes in contrib and backend/access/myindex_name, is there

> any other places I need to add some infos?

What? Why are you doing these things?

        hp

--

   _  | Peter J. Holzer    | Story must make more sense than reality.

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