Re: [SQL] index row size 2728 exceeds btree maximum, 27

To me it seems that the definer of this table missed the concept index ...
or the concept database
One usually looks up data using a key, but if the whole row is the key, what
data shall be looked up.

So short story long: Remove data from your index.  The data column seems
like the data to be looked up using the key
(scan_id, host_ip, port_num, plugin_id, severity) or even less.
Postgres is able to take several indices over distinct columns into account.
Thus reducing the possible candidates to a hand full.
So several indices are also an option

|-----Original Message-----
|From: Dinesh Pandey [mailto:dpandey@secf.com]
|Sent: Donnerstag, 01. Jänner 2004 11:09
|To: 'Richard Huxton'
|Cc: pgsql-general@postgresql.org; 'PostgreSQL'
|Subject: Re: [SQL] [GENERAL] index row size 2728 exceeds btree maximum,
|2713
|
|
|I am inserting some log messages in the column "data". (Basically I am
|inserting records from reading an xml file)
|
|In the PRIMARY KEY, btree (scan_id, host_ip, port_num,
|plugin_id, severity,
|data) data is of type TEXT and can contain long string values.
|
|The question is how to remove this error "index row size 2728
|exceeds btree
|maximum, 2713" by increasing the btree size?
|
|The big problem is "I can not add any additional column in this table."
|
|Thanks
|Dinesh Pandey
|
|-----Original Message-----
|From: pgsql-general-owner@postgresql.org
|[mailto:pgsql-general-owner@postgresql.org] On Behalf Of Richard Huxton
|Sent: Thursday, June 02, 2005 3:29 PM
|To: dpandey@secf.com
|Cc: pgsql-general@postgresql.org; 'PostgreSQL'
|Subject: Re: [GENERAL] index row size 2728 exceeds btree maximum, 2713
|
|Dinesh Pandey wrote:
|> -----------+-----------------------+-----------
|>   Column    |         Type
|> -----------+-----------------------+-----------
|>  scan_id    | bigint
|>  host_ip    | character varying(15)
|>  port_num | integer
|>  plugin_id  | integer
|>  severity   | character varying(50)
|>  data       | text
|>
|> Indexes:
|>     "pk_scanned_port_info" PRIMARY KEY, btree (scan_id,
|host_ip, port_num,
|> plugin_id, severity, data)
|>
|> On inserting record I am getting this error "index row size
|2728 exceeds
|> btree maximum, 2713"
|
|Well - the error message is clear enough. The question is, what to do.
|
|Without knowing what the table "means", it's difficult to say what the
|primary-key should be, but it seems unlikely to include an
|unlimited-length text-field called "data".
|
|If the data itself doesn't offer any suitable candidate keys (as can
|well be the case) then common practice is to generate a unique number
|and use that as an ID - in PostgreSQL's case by use of the SERIAL
|pseudo-type.
|
|Does that help?
|--
|   Richard Huxton
|   Archonet Ltd
|
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