The following bug has been logged online:

Bug reference: 2428
Logged by: Casey Duncan
Email address: casey (AT) pandora (DOT) com
PostgreSQL version: 8.1.3
Operating system: Debian Linux (2.6.13.1-20050914 #2 SMP) 2xOpteron 8GB
RAM
Description: ERROR: out of memory, running INSERT SELECT statement
Details:

I filed this a few days back, but I came up with some more detail. I started
with a clean 8.1.3 installation (no databases), imported a production
snapshot and ran part of a large upgrade script on it.

The server has this config:

shared_buffers = 20000
max_prepared_transactions = 200
work_mem = 8192 # 8 Mb
maintenance_work_mem = 131072 # 128 Mb
max_fsm_pages = 50000
wal_buffers = 64

The part of the db being upgraded has this schema to start with:

-- Begin Schema
SET client_encoding = 'UTF8';
SET default_with_oids = false;

CREATE TABLE ll (
ll_id integer DEFAULT nextval(('ll_id_seq'::text)::regclass) NOT NULL,
username text,
"password" text,
expiration_date timestamp without time zone,
state text NOT NULL,
billing_frequency text,
alert_code text,
auto_renew boolean DEFAULT true NOT NULL,
email_opt_in boolean DEFAULT false NOT NULL,
date_created timestamp without time zone DEFAULT now(),
web_name text,
birth_year integer,
gender text,
zipcode text
);

CREATE SEQUENCE ll_id_seq
INCREMENT BY 1
NO MAXVALUE
NO MINVALUE
CACHE 1;

CREATE TABLE ll_to_ss (
ll_id integer NOT NULL,
ss_id integer NOT NULL,
time_added timestamp without time zone DEFAULT now()
);

CREATE TABLE ss (
ss_id integer DEFAULT nextval(('ss_id_seq'::text)::regclass) NOT NULL,
name character varying(64) NOT NULL,
creator_id integer NOT NULL,
ll_count integer DEFAULT 0 NOT NULL,
initial_mm_id character varying(20),
CONSTRAINT ss_name CHECK (((name)::text <> ''::text))
);

CREATE SEQUENCE ss_id_seq
INCREMENT BY 1
NO MAXVALUE
NO MINVALUE
CACHE 1;

ALTER TABLE ONLY ll
ADD CONSTRAINT ll_pkey PRIMARY KEY (ll_id);
ALTER TABLE ONLY ll_to_ss
ADD CONSTRAINT ll_to_ss_pkey PRIMARY KEY (ll_id, ss_id);
ALTER TABLE ll_to_ss CLUSTER ON ll_to_ss_pkey;
ALTER TABLE ONLY ll
ADD CONSTRAINT ll_username_key UNIQUE (username);
ALTER TABLE ONLY ll
ADD CONSTRAINT ll_web_name_key UNIQUE (web_name);
ALTER TABLE ONLY ss
ADD CONSTRAINT ss_pkey PRIMARY KEY (ss_id);
CREATE INDEX ll_expiration_date_idx ON ll USING btree (expiration_date);
CREATE INDEX ll_to_ss_ss_id_idx ON ll_to_ss USING btree (ss_id);
CREATE INDEX ss_creator_id_initial_mm_id_idx ON ss USING btree (creator_id,
initial_mm_id);
CREATE INDEX ss_ll_count_idx ON ss USING btree (ll_count);
ALTER TABLE ONLY ss
ADD CONSTRAINT "$1" FOREIGN KEY (creator_id) REFERENCES ll(ll_id);
ALTER TABLE ONLY ll_to_ss
ADD CONSTRAINT "$1" FOREIGN KEY (ll_id) REFERENCES ll(ll_id);
ALTER TABLE ONLY ll_to_ss
ADD CONSTRAINT "$2" FOREIGN KEY (ss_id) REFERENCES ss(ss_id) ON DELETE
RESTRICT;
-- End of Schema

Here is the upgrade script that causes the memory error:

BEGIN; --Upgrade script
ALTER TABLE ss RENAME COLUMN creator_id TO ll_id;

DROP INDEX ss_creator_id_initial_mm_id_idx;
CREATE INDEX ss_ll_id_initial_mm_id ON
ss (ll_id, initial_mm_id);

DROP INDEX ss_ll_count_idx;

ALTER TABLE ss ALTER COLUMN ss_id DROP DEFAULT;
ALTER TABLE ss ALTER COLUMN ll_id DROP NOT NULL;
ALTER TABLE ss DROP COLUMN ll_count;
ALTER TABLE ss ADD COLUMN shared_ss_id BIGINT;
ALTER TABLE ss ADD COLUMN time_added TIMESTAMP;
ALTER TABLE ss ADD COLUMN shared_creator_id BIGINT;
ALTER TABLE ss ADD CONSTRAINT ss_shared_chk CHECK
((shared_ss_id != ss_id) AND (shared_creator_id != ll_id));

-- Update ss table in place for "original" sss
UPDATE ss SET time_added = lts.time_added
FROM ll_to_ss AS lts
WHERE ss.ll_id = lts.ll_id;

-- Add content to ss table for shared sss
INSERT INTO ss
(ss_id, name, ll_id, shared_ss_id, time_added,
shared_creator_id)
SELECT nextval('ss_id_seq'), s.name, lts.ll_id, s.ss_id,
lts.time_added, s.ll_id
FROM ss AS s, ll_to_ss AS lts
WHERE lts.ll_id != s.ll_id;

DROP TABLE ll_to_ss CASCADE;

CREATE FUNCTION write_error_trigf() RETURNS trigger AS '
BEGIN
RAISE EXCEPTION ''Writes not allowed to this table on this node'';
END;
' LANGUAGE plpgsql;
END; --Upgrade script

In the database being upgraded, the "ll" table has 8740364 rows, the "ss"
table has 18953787 rows and the "ll_to_ss" has 19233345 rows. The script
runs fine on an empty database. Running the script on the populated database
results in the following error (from the server log):

TopMemoryContext: 61976 total in 6 blocks; 5936 free (11 chunks); 56040
used
Type information cache: 8192 total in 1 blocks; 1864 free (0 chunks); 6328
used
Operator class cache: 8192 total in 1 blocks; 4936 free (0 chunks); 3256
used
TopTransactionContext: -1268785152 total in 372 blocks; 12672 free (372
chunks); -1268797824 used
MessageContext: 24576 total in 2 blocks; 1152 free (4 chunks); 23424 used
smgr relation table: 8192 total in 1 blocks; 2872 free (0 chunks); 5320
used
Portal hash: 8192 total in 1 blocks; 3912 free (0 chunks); 4280 used
PortalMemory: 8192 total in 1 blocks; 8040 free (0 chunks); 152 used
PortalHeapMemory: 1024 total in 1 blocks; 896 free (0 chunks); 128 used
ExecutorState: 8912976 total in 12 blocks; 8361368 free (109253 chunks);
551608 used
ExprContext: 0 total in 0 blocks; 0 free (0 chunks); 0 used
ExprContext: 0 total in 0 blocks; 0 free (0 chunks); 0 used
ExprContext: 0 total in 0 blocks; 0 free (0 chunks); 0 used
ExprContext: 8192 total in 1 blocks; 8128 free (0 chunks); 64 used
Relcache by OID: 8192 total in 1 blocks; 3376 free (0 chunks); 4816 used
CacheMemoryContext: 516096 total in 6 blocks; 81656 free (0 chunks); 434440
used
ll_to_ss_ss_id_idx: 1024 total in 1 blocks; 392 free (0 chunks); 632 used
ll_to_ss_pkey: 1024 total in 1 blocks; 328 free (0 chunks); 696 used
ss_pkey: 1024 total in 1 blocks; 392 free (0 chunks); 632 used
pg_constraint_contypid_index: 1024 total in 1 blocks; 392 free (0 chunks);
632 used
pg_constraint_oid_index: 1024 total in 1 blocks; 392 free (0 chunks); 632
used
pg_constraint_conname_nsp_index: 1024 total in 1 blocks; 328 free (0
chunks); 696 used
pg_attrdef_oid_index: 1024 total in 1 blocks; 392 free (0 chunks); 632 used
ss_ll_id_initial_mm_id: 1024 total in 1 blocks; 328 free (0 chunks); 696
used
pg_shdepend_depender_index: 1024 total in 1 blocks; 256 free (0 chunks); 768
used
pg_description_o_c_o_index: 1024 total in 1 blocks; 256 free (0 chunks); 768
used
pg_depend_depender_index: 1024 total in 1 blocks; 256 free (0 chunks); 768
used
pg_depend_reference_index: 1024 total in 1 blocks; 256 free (0 chunks); 768
used
pg_trigger_oid_index: 1024 total in 1 blocks; 392 free (0 chunks); 632 used
pg_trigger_tgconstrrelid_index: 1024 total in 1 blocks; 392 free (0 chunks);
632 used
pg_trigger_tgconstrname_index: 1024 total in 1 blocks; 392 free (0 chunks);
632 used
pg_index_indrelid_index: 1024 total in 1 blocks; 392 free (0 chunks); 632
used
pg_constraint_conrelid_index: 1024 total in 1 blocks; 392 free (0 chunks);
632 used
pg_attrdef_adrelid_adnum_index: 1024 total in 1 blocks; 328 free (0 chunks);
696 used
pg_type_typname_nsp_index: 1024 total in 1 blocks; 328 free (0 chunks); 696
used
pg_type_oid_index: 1024 total in 1 blocks; 392 free (0 chunks); 632 used
pg_trigger_tgrelid_tgname_index: 1024 total in 1 blocks; 328 free (0
chunks); 696 used
pg_statistic_relid_att_index: 1024 total in 1 blocks; 328 free (0 chunks);
696 used
pg_auth_members_member_role_index: 1024 total in 1 blocks; 328 free (0
chunks); 696 used
pg_auth_members_role_member_index: 1024 total in 1 blocks; 328 free (0
chunks); 696 used
pg_rewrite_rel_rulename_index: 1024 total in 1 blocks; 328 free (0 chunks);
696 used
pg_proc_proname_args_nsp_index: 1024 total in 1 blocks; 256 free (0 chunks);
768 used
pg_proc_oid_index: 1024 total in 1 blocks; 392 free (0 chunks); 632 used
pg_operator_oprname_l_r_n_index: 1024 total in 1 blocks; 192 free (0
chunks); 832 used
pg_operator_oid_index: 1024 total in 1 blocks; 392 free (0 chunks); 632
used
pg_opclass_oid_index: 1024 total in 1 blocks; 392 free (0 chunks); 632 used
pg_opclass_am_name_nsp_index: 1024 total in 1 blocks; 256 free (0 chunks);
768 used
pg_namespace_oid_index: 1024 total in 1 blocks; 392 free (0 chunks); 632
used
pg_namespace_nspname_index: 1024 total in 1 blocks; 392 free (0 chunks); 632
used
pg_language_oid_index: 1024 total in 1 blocks; 392 free (0 chunks); 632
used
pg_language_name_index: 1024 total in 1 blocks; 392 free (0 chunks); 632
used
pg_inherits_relid_seqno_index: 1024 total in 1 blocks; 328 free (0 chunks);
696 used
pg_index_indexrelid_index: 1024 total in 1 blocks; 392 free (0 chunks); 632
used
pg_authid_oid_index: 1024 total in 1 blocks; 392 free (0 chunks); 632 used
pg_authid_rolname_index: 1024 total in 1 blocks; 392 free (0 chunks); 632
used
pg_database_datname_index: 1024 total in 1 blocks; 392 free (0 chunks); 632
used
pg_conversion_oid_index: 1024 total in 1 blocks; 392 free (0 chunks); 632
used
pg_conversion_name_nsp_index: 1024 total in 1 blocks; 328 free (0 chunks);
696 used
pg_conversion_default_index: 1024 total in 1 blocks; 192 free (0 chunks);
832 used
pg_class_relname_nsp_index: 1024 total in 1 blocks; 328 free (0 chunks); 696
used
pg_class_oid_index: 1024 total in 1 blocks; 392 free (0 chunks); 632 used
pg_cast_source_target_index: 1024 total in 1 blocks; 328 free (0 chunks);
696 used
pg_attribute_relid_attnum_index: 1024 total in 1 blocks; 328 free (0
chunks); 696 used
pg_attribute_relid_attnam_index: 1024 total in 1 blocks; 328 free (0
chunks); 696 used
pg_amproc_opc_proc_index: 1024 total in 1 blocks; 256 free (0 chunks); 768
used
pg_amop_opr_opc_index: 1024 total in 1 blocks; 328 free (0 chunks); 696
used
pg_amop_opc_strat_index: 1024 total in 1 blocks; 256 free (0 chunks); 768
used
pg_aggregate_fnoid_index: 1024 total in 1 blocks; 392 free (0 chunks); 632
used
MdSmgr: 8192 total in 1 blocks; 6568 free (0 chunks); 1624 used
LockTable (locallock hash): 8192 total in 1 blocks; 3912 free (0 chunks);
4280 used
Timezones: 47592 total in 2 blocks; 5968 free (0 chunks); 41624 used
ErrorContext: 8192 total in 1 blocks; 8176 free (4 chunks); 16 used
2006-05-08 18:35:28.494 PDT [d:radio_source u:slony s:445fc180.17e3 15]
ERROR: out of memory
2006-05-08 18:35:28.494 PDT [d:radio_source u:slony s:445fc180.17e3 16]
DETAIL: Failed on request of size 32.
2006-05-08 18:35:28.494 PDT [d:radio_source u:slony s:445fc180.17e3 17]
STATEMENT: INSERT INTO ss
(ss_id, name, ll_id, shared_ss_id, time_added,
shared_creator_id)
SELECT nextval('ss_id_seq'), s.name, lts.ll_id, s.ss_id,
lts.time_added, s.ll_id
FROM ss AS s, ll_to_ss AS lts
WHERE lts.ll_id != s.ll_id;

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