Re: [SQL] How to union table without union statement?

[Shane Ambler]

calendarw wrote:
Hi,
I am using the following query now, but the time is too slow.  could anyone
can help me?

CREATE OR REPLACE VIEW alllogview AS
((((((( SELECT alarmdtl.tagname, a_alarmtbl.occurtime,
a_alarmtbl.restoretime, a_alarmtbl.ack, alarmdtl.alarmtype,
alarmdtl.alarmmsg1, alarmdtl.alarmmsg2, alarmdtl.alarmloc
  FROM a_alarmtbl, alarmdtl
 WHERE a_alarmtbl.tagname::text = alarmdtl.tagname::text
UNION ALL
SELECT alarmdtl.tagname, b_alarmtbl.occurtime, b_alarmtbl.restoretime,
b_alarmtbl.ack, alarmdtl.alarmtype, alarmdtl.alarmmsg1, alarmdtl.alarmmsg2,
alarmdtl.alarmloc
  FROM b_alarmtbl, alarmdtl
 WHERE b_alarmtbl.tagname::text = alarmdtl.tagname::text)
UNION ALL
SELECT alarmdtl.tagname, c_alarmtbl.occurtime, c_alarmtbl.restoretime,
c_alarmtbl.ack, alarmdtl.alarmtype, alarmdtl.alarmmsg1, alarmdtl.alarmmsg2,
alarmdtl.alarmloc
  FROM c_alarmtbl, alarmdtl
 WHERE c_alarmtbl.tagname::text = alarmdtl.tagname::text)
UNION ALL
SELECT alarmdtl.tagname, d_alarmtbl.occurtime, d_alarmtbl.restoretime,
d_alarmtbl.ack, alarmdtl.alarmtype, alarmdtl.alarmmsg1, alarmdtl.alarmmsg2,
alarmdtl.alarmloc
  FROM d_alarmtbl, alarmdtl
 WHERE d_alarmtbl.tagname::text = alarmdtl.tagname::text)
UNION ALL
SELECT alarmdtl.tagname, e_alarmtbl.occurtime, e_alarmtbl.restoretime,
e_alarmtbl.ack, alarmdtl.alarmtype, alarmdtl.alarmmsg1, alarmdtl.alarmmsg2,
alarmdtl.alarmloc
  FROM e_alarmtbl, alarmdtl
 WHERE e_alarmtbl.tagname::text = alarmdtl.tagname::text)
UNION ALL
SELECT alarmdtl.tagname, f_alarmtbl.occurtime, f_alarmtbl.restoretime,
f_alarmtbl.ack, alarmdtl.alarmtype, alarmdtl.alarmmsg1, alarmdtl.alarmmsg2,
alarmdtl.alarmloc
  FROM f_alarmtbl, alarmdtl
 WHERE f_alarmtbl.tagname::text = alarmdtl.tagname::text)
UNION ALL
SELECT alarmdtl.tagname, g_alarmtbl.occurtime, g_alarmtbl.restoretime,
g_alarmtbl.ack, alarmdtl.alarmtype, alarmdtl.alarmmsg1, alarmdtl.alarmmsg2,
alarmdtl.alarmloc
  FROM g_alarmtbl, alarmdtl
 WHERE g_alarmtbl.tagname::text = alarmdtl.tagname::text)
UNION ALL
SELECT alarmdtl.tagname, h_alarmtbl.occurtime, h_alarmtbl.restoretime,
h_alarmtbl.ack, alarmdtl.alarmtype, alarmdtl.alarmmsg1, alarmdtl.alarmmsg2,
alarmdtl.alarmloc
  FROM h_alarmtbl, alarmdtl
 WHERE h_alarmtbl.tagname::text = alarmdtl.tagname::text)
UNION ALL
SELECT alarmdtl.tagname, i_alarmtbl.occurtime, i_alarmtbl.restoretime,
i_alarmtbl.ack, alarmdtl.alarmtype, alarmdtl.alarmmsg1, alarmdtl.alarmmsg2,
alarmdtl.alarmloc
  FROM i_alarmtbl, alarmdtl
 WHERE i_alarmtbl.tagname::text = alarmdtl.tagname::text
 ORDER BY 1;


Have you done an EXPLAIN on the query?
Is there an index on the tagname columns?
If so does the EXPLAIN show them being used?

How many rows do you have in each table (roughly)?

Have you considered other structure options like partitioning?
Is there a real need to have these tables separate? or could you have 
them all in one table with an column to identify the source of the log 
entry?


On 2/28/07, Hiltibidal, Robert <[EMAIL PROTECTED]> wrote:

 Can you provide a schema?


 ------------------------------

*From:* [EMAIL PROTECTED] [mailto:
[EMAIL PROTECTED] *On Behalf Of *calendarw
*Sent:* Wednesday, February 28, 2007 4:33 AM
*To:* pgsql-sql@postgresql.org
*Subject:* [SQL] How to union table without union statement?



Hi,

I need to combine 10 tables which contain same table structure and 
join an
"other table" to show the latest 200 record, I am join the "other table"
first and using union statement to select all record now but the 
collection
time is super slow, how can I improve the collection speed?

Thanks.

--
Jr. P
calendarw

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--

Shane Ambler
[EMAIL PROTECTED]

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