Getting "Out of memory" errors on server 9.1.9

I'm getting a "Out of memory" error on a 9.1.9 server. What do these lines
in the log mean? ~ Brian

TopMemoryContext: 738160 total in 82 blocks; 11792 free (52 chunks); 726368
used
Type information cache: 24576 total in 2 blocks; 11888 free (5 chunks);
12688 used
Operator lookup cache: 24576 total in 2 blocks; 11888 free (5 chunks);
12688 used
TopTransactionContext: 8192 total in 1 blocks; 7328 free (0 chunks); 864
used
MessageContext: 3046113280 total in 374 blocks; 24584 free (5 chunks);
3046088696 used
Operator class cache: 8192 total in 1 blocks; 1680 free (0 chunks); 6512
used
smgr relation table: 24576 total in 2 blocks; 13920 free (4 chunks);
10656 used
TransactionAbortContext: 32768 total in 1 blocks; 32736 free (0 chunks);
32 used
Portal hash: 8192 total in 1 blocks; 1680 free (0 chunks); 6512 used
PortalMemory: 8192 total in 1 blocks; 8160 free (1 chunks); 32 used
Relcache by OID: 122880 total in 4 blocks; 13456 free (7 chunks); 109424
used
CacheMemoryContext: 8682160 total in 24 blocks; 3426208 free (1 chunks);
5255952 used
v_paths_netmedia: 3415040 total in 419 blocks; 14264 free (24 chunks);
3400776 used
v_paths_shottree: 14818304 total in 1811 blocks; 26704 free (106
chunks); 14791600 used
pg_toast_2618_index: 2048 total in 1 blocks; 664 free (0 chunks); 1384
used
v_paths_limbo: 269312 total in 35 blocks; 2536 free (0 chunks); 266776
used
v_paths: 31744 total in 6 blocks; 4568 free (0 chunks); 27176 used
pg_db_role_setting_databaseid_rol_index: 2048 total in 1 blocks; 712
free (0 chunks); 1336 used
pg_opclass_am_name_nsp_index: 3072 total in 2 blocks; 1496 free (2
chunks); 1576 used
pg_foreign_data_wrapper_name_index: 3072 total in 2 blocks; 1768 free
(4 chunks); 1304 used
pg_enum_oid_index: 3072 total in 2 blocks; 1768 free (4 chunks); 1304
used
pg_class_relname_nsp_index: 3072 total in 2 blocks; 1656 free (3
chunks); 1416 used
pg_foreign_server_oid_index: 3072 total in 2 blocks; 1768 free (4
chunks); 1304 used
pg_statistic_relid_att_inh_index: 3072 total in 2 blocks; 1544 free (2
chunks); 1528 used
pg_cast_source_target_index: 3072 total in 2 blocks; 1656 free (3
chunks); 1416 used
pg_language_name_index: 3072 total in 2 blocks; 1768 free (4 chunks);
1304 used
pg_collation_oid_index: 3072 total in 2 blocks; 1768 free (4 chunks);
1304 used
pg_amop_fam_strat_index: 3072 total in 2 blocks; 1496 free (2 chunks);
1576 used
pg_index_indexrelid_index: 3072 total in 2 blocks; 1720 free (3
chunks); 1352 used
pg_ts_template_tmplname_index: 3072 total in 2 blocks; 1704 free (4
chunks); 1368 used
pg_ts_config_map_index: 3072 total in 2 blocks; 1544 free (2 chunks);
1528 used
pg_opclass_oid_index: 3072 total in 2 blocks; 1720 free (3 chunks);
1352 used
pg_foreign_data_wrapper_oid_index: 3072 total in 2 blocks; 1768 free (4
chunks); 1304 used
pg_ts_dict_oid_index: 3072 total in 2 blocks; 1768 free (4 chunks);
1304 used
pg_conversion_default_index: 3072 total in 2 blocks; 1544 free (2
chunks); 1528 used
pg_operator_oprname_l_r_n_index: 3072 total in 2 blocks; 1496 free (2
chunks); 1576 used
pg_trigger_tgrelid_tgname_index: 3072 total in 2 blocks; 1704 free (4
chunks); 1368 used
pg_enum_typid_label_index: 3072 total in 2 blocks; 1704 free (4
chunks); 1368 used
pg_ts_config_oid_index: 3072 total in 2 blocks; 1768 free (4 chunks);
1304 used
pg_user_mapping_oid_index: 3072 total in 2 blocks; 1768 free (4
chunks); 1304 used
pg_opfamily_am_name_nsp_index: 3072 total in 2 blocks; 1544 free (2
chunks); 1528 used
pg_foreign_table_relid_index: 3072 total in 2 blocks; 1768 free (4
chunks); 1304 used
pg_type_oid_index: 3072 total in 2 blocks; 1720 free (3 chunks); 1352
used
pg_aggregate_fnoid_index: 3072 total in 2 blocks; 1768 free (4 chunks);
1304 used
pg_constraint_oid_index: 3072 total in 2 blocks; 1768 free (4 chunks);
1304 used
pg_rewrite_rel_rulename_index: 3072 total in 2 blocks; 1656 free (3
chunks); 1416 used
pg_ts_parser_prsname_index: 3072 total in 2 blocks; 1704 free (4
chunks); 1368 used
pg_ts_config_cfgname_index: 3072 total in 2 blocks; 1704 free (4
chunks); 1368 used
pg_ts_parser_oid_index: 3072 total in 2 blocks; 1768 free (4 chunks);
1304 used
pg_operator_oid_index: 3072 total in 2 blocks; 1720 free (3 chunks);
1352 used
pg_namespace_nspname_index: 3072 total in 2 blocks; 1720 free (3
chunks); 1352 used
pg_ts_template_oid_index: 3072 total in 2 blocks; 1768 free (4 chunks);
1304 used
pg_amop_opr_fam_index: 3072 total in 2 blocks; 1544 free (2 chunks);
1528 used
pg_default_acl_role_nsp_obj_index: 3072 total in 2 blocks; 1544 free (2
chunks); 1528 used
pg_collation_name_enc_nsp_index: 3072 total in 2 blocks; 1544 free (2
chunks); 1528 used
pg_ts_dict_dictname_index: 3072 total in 2 blocks; 1704 free (4
chunks); 1368 used
pg_type_typname_nsp_index: 3072 total in 2 blocks; 1704 free (4
chunks); 1368 used
pg_opfamily_oid_index: 3072 total in 2 blocks; 1768 free (4 chunks);
1304 used
pg_class_oid_index: 3072 total in 2 blocks; 1720 free (3 chunks); 1352
used
pg_proc_proname_args_nsp_index: 3072 total in 2 blocks; 1496 free (2
chunks); 1576 used
pg_attribute_relid_attnum_index: 3072 total in 2 blocks; 1656 free (3
chunks); 1416 used
pg_proc_oid_index: 3072 total in 2 blocks; 1720 free (3 chunks); 1352
used
pg_language_oid_index: 3072 total in 2 blocks; 1768 free (4 chunks);
1304 used
pg_namespace_oid_index: 3072 total in 2 blocks; 1768 free (4 chunks);
1304 used
pg_amproc_fam_proc_index: 3072 total in 2 blocks; 1496 free (2 chunks);
1576 used
pg_foreign_server_name_index: 3072 total in 2 blocks; 1768 free (4
chunks); 1304 used
pg_attribute_relid_attnam_index: 3072 total in 2 blocks; 1704 free (4
chunks); 1368 used
pg_conversion_oid_index: 3072 total in 2 blocks; 1768 free (4 chunks);
1304 used
pg_user_mapping_user_server_index: 3072 total in 2 blocks; 1704 free (4
chunks); 1368 used
pg_conversion_name_nsp_index: 3072 total in 2 blocks; 1704 free (4
chunks); 1368 used
pg_authid_oid_index: 3072 total in 2 blocks; 1720 free (3 chunks); 1352
used
pg_auth_members_member_role_index: 3072 total in 2 blocks; 1704 free (4
chunks); 1368 used
pg_tablespace_oid_index: 3072 total in 2 blocks; 1768 free (4 chunks);
1304 used
pg_database_datname_index: 3072 total in 2 blocks; 1720 free (3
chunks); 1352 used
pg_auth_members_role_member_index: 3072 total in 2 blocks; 1704 free (4
chunks); 1368 used
pg_database_oid_index: 3072 total in 2 blocks; 1720 free (3 chunks);
1352 used
pg_authid_rolname_index: 3072 total in 2 blocks; 1720 free (3 chunks);
1352 used
MdSmgr: 8192 total in 1 blocks; 8128 free (0 chunks); 64 used
LOCALLOCK hash: 516096 total in 6 blocks; 268800 free (21 chunks); 247296
used
Timezones: 83472 total in 2 blocks; 3744 free (0 chunks); 79728 used
ErrorContext: 8192 total in 1 blocks; 8160 free (4 chunks); 32 used
2013-08-22 08:01:15 PDT ERROR: out of memory
2013-08-22 08:01:15 PDT DETAIL: Failed on request of size 40.