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Table size growing for no reason - Mailing list pgsql-admin

From	Benjamin Krajmalnik
Subject	Table size growing for no reason
Date	July 13, 2006 22:02:26
Msg-id	BF337097BDD9D849A2F4B818DDB27987029447@stash.stackdump.local Whole thread Raw
Responses	Re: Table size growing for no reason
List	pgsql-admin

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I am running PostgreSQL 8.1.4 on windows.

I have a table with the following structure:

CREATE TABLE "public"."tblksaura" (
"ksaurasysid" SERIAL,
"testtime" TIMESTAMP WITHOUT TIME ZONE,
"lasthouralive" DOUBLE PRECISION[],
"last24hrsalive" DOUBLE PRECISION[],
"last7daysalive" DOUBLE PRECISION[],
"last30daysalive" DOUBLE PRECISION[],
"sumalivelasthour" DOUBLE PRECISION,
"sumreplylasthour" DOUBLE PRECISION,
"sumalivelast24hrs" DOUBLE PRECISION,
"sumalivelast7days" DOUBLE PRECISION,
"sumalivelast30days" DOUBLE PRECISION,
"sumreplylast24hrs" DOUBLE PRECISION,
"sumreplylast7days" DOUBLE PRECISION,
"sumreplylast30days" DOUBLE PRECISION,
"lasthourreply" DOUBLE PRECISION[],
"last24hrsreply" DOUBLE PRECISION[],
"last7daysreply" DOUBLE PRECISION[],
"last30daysreply" DOUBLE PRECISION[],
"lasthourstatus" INTEGER[],
"totaltestslasthour" BIGINT[],
"totaltestslast24hrs" BIGINT[],
"totaltestslast7days" BIGINT[],
"totaltestslast30days" BIGINT[],
"kstestssysid" INTEGER,
CONSTRAINT "tblksaura_kstestssysid_key" UNIQUE("kstestssysid"),
CONSTRAINT "tblksaura_pkey" PRIMARY KEY("ksaurasysid"),
CONSTRAINT "tblksaura_fk_tblkstests" FOREIGN KEY ("kstestssysid")
    REFERENCES "public"."tblkstests"("kstestssysid")
    MATCH FULL
    ON DELETE CASCADE
    ON UPDATE NO ACTION
    NOT DEFERRABLE
) WITHOUT OIDS;

CREATE UNIQUE INDEX "tblksaura_idx_kstestssysid" ON "public"."tblksaura"
USING btree ("kstestssysid", "testtime");

Running explain select * from tblkaura indicates that the width of the row is 1859.

The table has 3297 rows.

Initially, it was 6.8MB. All of a sudden it has started growing in size - both on the main table size, the indices, and toast.

I truncated the table and reloaded the data - it went back to 6.8 Mb.

This table is updated at a rate of about 10-12 updates statements per second, by a single connection (a monitoring agent).

What can be causing this strange behavior? Is there anything which can be done? The update is being performed by a pl/pgsql stored procedure.

The SQL query which is updating it uses the primary key for retrieveing the field.

The query looks as follows:

       update tblksaura
         set
           testtime = t_mytesttime,
           totaltestslasthour = ia_totaltestslasthour,
           totaltestslast24hrs = ia_totaltestslast24hrs,
           totaltestslast7days = ia_totaltestslast7days,
           totaltestslast30days = ia_totaltestslast30days,
           lasthourstatus = ia_lasthourstatus,
           lasthourreply = fa_lasthourreply,
           last24hrsreply = fa_last24hrsreply,
           last7daysreply = fa_last7daysreply,
           last30daysreply = fa_last30daysreply,
           lasthouralive = fa_lasthouralive,
           last24hrsalive = fa_last24hrsalive,
           last7daysalive = fa_last7daysalive,
           last30daysalive = fa_last30daysalive,
           sumalivelasthour = r_aurarecord.sumalivelasthour,
           sumreplylasthour = r_aurarecord.sumreplylasthour,
           sumalivelast24hrs = r_aurarecord.sumalivelast24hrs,
           sumreplylast24hrs = r_aurarecord.sumreplylast24hrs,
           sumalivelast7days = r_aurarecord.sumalivelast7days,
           sumreplylast7days = r_aurarecord.sumreplylast7days,
           sumalivelast30days = r_aurarecord.sumalivelast30days,
           sumreplylast30days = r_aurarecord.sumreplylast30days
        where ksaurasysid = r_aurarecord.ksaurasysid;

Any assistance in getting this tracked down will be deeply appreciated.

Looking at the current running processes in pgadmin I cannot see anything which could be causing this.

After about 1 hour of running, the table is now over 450MB!!!!!

I am out of ideas.

pgsql-admin by date:

From: Tom Lane
Date: 13 July 2006, 21:40:26
Subject: Re: corruption since 7.4.13 update ?

From: "Rodrigo De Leon"
Date: 13 July 2006, 22:08:19
Subject: Re: Table size growing for no reason

Table size growing for no reason - Mailing list pgsql-admin

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