Re: Very strange postgresql behaviour

Hi Andrew,

> I'm not sure about this for 7.4.2, but I'm running 8.1.3 and when I ran
> into a problem like that (having to select two distinct options) the
> solution that worked for me was to put the entire or statement within
> parentheses. In your case, that would be this:
>
> espsm_asme=# select customer_app_config_id, customer_app_config_name
> from customer_app_config where (customer_app_config_id = 5929 or
> customer_app_config_id = 11527) order by customer_app_config_id;

The result is the same, in fact, the original query was
select customer_app_config_id, customer_app_config_name
from customer_app_config where customer_app_config_id in ( 5929, 11527)
order by customer_app_config_id;

Any other idea?

>
> I hope that helps.
>
>
> */Arnau <arnaulist(at)andromeiberica(dot)com>/* wrote:
>
> Hi all,
>
> I have postgresql 7.4.2 running on debian and I have the oddest
> postgresql behaviour I've ever seen.
>
> I do the following queries:
>
>
> espsm_asme=# select customer_app_config_id, customer_app_config_name
> from customer_app_config where customer_app_config_id = 5929 or
> customer_app_config_id = 11527 order by customer_app_config_id;
>
>
> customer_app_config_id | customer_app_config_name
> ------------------------+--------------------------
> 5929 | INFO
> (1 row)
>
>
> I do the same query but changing the order of the or conditions:
>
>
> espsm_asme=# select customer_app_config_id, customer_app_config_name
> from customer_app_config where customer_app_config_id = 11527 or
> customer_app_config_id = 5929 order by customer_app_config_id;
>
>
> customer_app_config_id | customer_app_config_name
> ------------------------+--------------------------
> 11527 | MOVIDOSERENA TONI 5523
> (1 row)
>
>
>
> As you can see, the configuration 5929 and 11527 both exists, but
> when I do the queries they don't appear.
>
> Here below you have the execution plans. Those queries use an index,
> I have done reindex table customer_app_config but nothing has changed.
>
> espsm_asme=# explain analyze select customer_app_config_id,
> customer_app_config_name from customer_app_config where
> customer_app_config_id = 11527 or customer_app_config_id = 5929
> order by
> customer_app_config_id;
>
> QUERY PLAN
>
> --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
> Sort (cost=10.28..10.29 rows=2 width=28) (actual time=0.252..0.253
> rows=1 loops=1)
> Sort Key: customer_app_config_id
> -> Index Scan using pk_cag_customer_application_id,
> pk_cag_customer_application_id on customer_app_config (cost=0.00..10.27
> rows=2 width=28) (actual time=0.168..0.232 rows=1 loops=1)
> Index Cond: ((customer_app_config_id = 11527::numeric) OR
> (customer_app_config_id = 5929::numeric))
> Total runtime: 0.305 ms
> (5 rows)
>
> espsm_asme=# explain analyze select customer_app_config_id,
> customer_app_config_name from customer_app_config where
> customer_app_config_id = 5929 or customer_app_config_id = 11527
> order by
> customer_app_config_id;
>
> QUERY PLAN
>
> --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
> Sort (cost=10.28..10.29 rows=2 width=28) (actual time=0.063..0.064
> rows=1 loops=1)
> Sort Key: customer_app_config_id
> -> Index Scan using pk_cag_customer_application_id,
> pk_cag_customer_application_id on customer_app_config (cost=0.00..10.27
> rows=2 width=28) (actual time=0.034..0.053 rows=1 loops=1)
> Index Cond: ((customer_app_config_id = 5929::numeric) OR
> (customer_app_config_id = 11527::numeric))
> Total runtime: 0.114 ms
> (5 rows)
>
> The table definition is the following:
>
> espsm_asme=# \d customer_app_config
> Table "public.customer_app_config"
> Column | Type | Modifiers
> --------------------------+-----------------------+--------------------
> customer_app_config_id | numeric(10,0) | not null
> customer_app_config_name | character varying(32) | not null
> keyword | character varying(43) |
> application_id | numeric(10,0) | not null
> customer_id | numeric(10,0) | not null
> customer_app_contents_id | numeric(10,0) |
> number_access_id | numeric(10,0) |
> prefix | character varying(10) |
> separator | numeric(1,0) | default 0
> on_hold | numeric(1,0) | not null default 0
> with_toss | numeric(1,0) | not null default 0
> number_id | numeric(10,0) |
> param_separator_id | numeric(4,0) | default 1
> memory_timeout | integer |
> with_memory | numeric(1,0) | default 0
> session_enabled | numeric(1,0) | default 0
> session_timeout | integer |
> number | character varying(15) |
> Indexes:
> "pk_cag_customer_application_id" primary key, btree
> (customer_app_config_id)
> "un_cag_kwordnumber" unique, btree (keyword, number_id)
> "idx_cappconfig_ccontentsid" btree (customer_app_contents_id)
> "idx_cappconfig_cusidappid" btree (customer_id, application_id)
> "idx_cappconfig_customerid" btree (customer_id)
> "idx_cappconfig_onhold" btree (on_hold)
> "idx_cappconfig_onholdkeyw" btree (on_hold, keyword)
> Rules:
>
> A lot of rules that I don't paste as matter of length.
>
>
> Do you have any idea about how I can fix this?
>
> --
> Arnau
>
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--
Arnau