Out of memory...why?

Hi,

When I ran a backup script I got this message from the db (7.4.7)
Do you have idea what is this? And why said Out of memory?
There is 16Gb memory (physical)
shared_buffers = 300000
sort_mem = 1024000
vacuum_mem = 128000
max_fsm_pages = 40000
max_fsm_relations = 2000
effective_cache_size = 153600
Which settings are wrong?

Thanks
Szabek

TopMemoryContext: 53784 total in 5 blocks; 11976 free (47 chunks); 41808
used
SPI Plan: 1024 total in 1 blocks; 352 free (0 chunks); 672 used
SPI Plan: 39936 total in 7 blocks; 6520 free (0 chunks); 33416 used
SPI Plan: 7168 total in 3 blocks; 1464 free (0 chunks); 5704 used
SPI Plan: 3072 total in 2 blocks; 64 free (0 chunks); 3008 used
SPI Plan: 7168 total in 3 blocks; 3880 free (0 chunks); 3288 used
SPI Plan: 7168 total in 3 blocks; 3384 free (0 chunks); 3784 used
SPI Plan: 7168 total in 3 blocks; 2632 free (0 chunks); 4536 used
SPI Plan: 7168 total in 3 blocks; 3384 free (0 chunks); 3784 used
SPI Plan: 3072 total in 2 blocks; 1888 free (0 chunks); 1184 used
SPI Plan: 7168 total in 3 blocks; 3008 free (0 chunks); 4160 used
SPI Plan: 3072 total in 2 blocks; 872 free (0 chunks); 2200 used
TopTransactionContext: 57344 total in 3 blocks; 25176 free (4 chunks);
32168 used
ExecutorState: 8192 total in 1 blocks; 7656 free (2 chunks); 536 used
SPI Exec: 645914648 total in 83 blocks; 8370416 free (19 chunks);
637544232 used
ExecutorState: 8192 total in 1 blocks; 7944 free (0 chunks); 248 used
ExprContext: 0 total in 0 blocks; 0 free (0 chunks); 0 used
SPI Proc: 37208 total in 3 blocks; 21544 free (18 chunks); 15664 used
DeferredTriggerXact: 0 total in 0 blocks; 0 free (0 chunks); 0 used
MessageContext: 8192 total in 1 blocks; 6304 free (8 chunks); 1888 used
PortalMemory: 8192 total in 1 blocks; 8040 free (0 chunks); 152 used
PortalHeapMemory: 1024 total in 1 blocks; 912 free (0 chunks); 112 used
ExecutorState: 8192 total in 1 blocks; 7016 free (6 chunks); 1176 used
ExprContext: 8192 total in 1 blocks; 8176 free (11 chunks); 16 used
CacheMemoryContext: 516096 total in 6 blocks; 105184 free (549 chunks);
410912 used
trs_idx: 2048 total in 1 blocks; 768 free (0 chunks); 1280 used
trs_idx: 2048 total in 1 blocks; 768 free (0 chunks); 1280 used
pg_opclass_oid_index: 1024 total in 1 blocks; 640 free (0 chunks); 384 used
pg_cast_source_target_index: 1024 total in 1 blocks; 320 free (0
chunks); 704 used
pg_opclass_am_name_nsp_index: 2048 total in 1 blocks; 768 free (0
chunks); 1280 used
pg_attribute_relid_attnam_index: 1024 total in 1 blocks; 320 free (0
chunks); 704 used
pg_depend_depender_index: 2048 total in 1 blocks; 768 free (0 chunks);
1280 used
pg_depend_reference_index: 2048 total in 1 blocks; 768 free (0 chunks);
1280 used
pg_type_typname_nsp_index: 1024 total in 1 blocks; 320 free (0 chunks);
704 used
pg_type_oid_index: 1024 total in 1 blocks; 640 free (0 chunks); 384 used
pg_statistic_relid_att_index: 1024 total in 1 blocks; 320 free (0
chunks); 704 used
mcb_pkey: 1024 total in 1 blocks; 320 free (0 chunks); 704 used
mcb_4_mcb_ind: 1024 total in 1 blocks; 320 free (0 chunks); 704 used
mcb_lge_id_mcb_index: 1024 total in 1 blocks; 640 free (0 chunks); 384 used
mcb_plnumber_mcb_in: 1024 total in 1 blocks; 640 free (0 chunks); 384 used
mcb_mtt_id_mcb_index: 1024 total in 1 blocks; 640 free (0 chunks); 384 used
pg_index_indrelid_index: 1024 total in 1 blocks; 640 free (0 chunks);
384 used
pg_proc_oid_index: 1024 total in 1 blocks; 640 free (0 chunks); 384 used
pg_operator_oprname_l_r_n_index: 2048 total in 1 blocks; 704 free (0
chunks); 1344 used
pg_attrdef_adrelid_adnum_index: 1024 total in 1 blocks; 320 free (0
chunks); 704 used
pg_shadow_usesysid_index: 1024 total in 1 blocks; 640 free (0 chunks);
384 used
pg_trigger_tgrelid_tgname_index: 1024 total in 1 blocks; 320 free (0
chunks); 704 used
pg_namespace_nspname_index: 1024 total in 1 blocks; 640 free (0 chunks);
384 used
pg_toast_1249557729_index: 1024 total in 1 blocks; 320 free (0 chunks);
704 used
pg_toast_1249557729_index: 1024 total in 1 blocks; 320 free (0 chunks);
704 used
pg_toast_1248543184_index: 1024 total in 1 blocks; 320 free (0 chunks);
704 used
pg_toast_1248543184_index: 1024 total in 1 blocks; 320 free (0 chunks);
704 used
pg_amop_opc_strategy_index: 1024 total in 1 blocks; 320 free (0 chunks);
704 used
pg_class_relname_nsp_index: 1024 total in 1 blocks; 320 free (0 chunks);
704 used
pg_operator_oid_index: 1024 total in 1 blocks; 640 free (0 chunks); 384 used
pg_amproc_opc_procnum_index: 1024 total in 1 blocks; 320 free (0
chunks); 704 used
pg_index_indexrelid_index: 1024 total in 1 blocks; 640 free (0 chunks);
384 used
pg_attribute_relid_attnum_index: 1024 total in 1 blocks; 320 free (0
chunks); 704 used
pg_class_oid_index: 1024 total in 1 blocks; 640 free (0 chunks); 384 used
MdSmgr: 8192 total in 1 blocks; 5904 free (0 chunks); 2288 used
DynaHash: 8192 total in 1 blocks; 6912 free (0 chunks); 1280 used
DynaHashTable: 8192 total in 1 blocks; 5080 free (0 chunks); 3112 used
DynaHashTable: 24576 total in 2 blocks; 14280 free (6 chunks); 10296 used
DynaHashTable: 8192 total in 1 blocks; 2008 free (0 chunks); 6184 used
DynaHashTable: 8192 total in 1 blocks; 952 free (0 chunks); 7240 used
DynaHashTable: 8192 total in 1 blocks; 3000 free (0 chunks); 5192 used
DynaHashTable: 24576 total in 2 blocks; 13240 free (4 chunks); 11336 used
DynaHashTable: 0 total in 0 blocks; 0 free (0 chunks); 0 used
DynaHashTable: 0 total in 0 blocks; 0 free (0 chunks); 0 used
DynaHashTable: 0 total in 0 blocks; 0 free (0 chunks); 0 used
DynaHashTable: 0 total in 0 blocks; 0 free (0 chunks); 0 used
DynaHashTable: 0 total in 0 blocks; 0 free (0 chunks); 0 used
ErrorContext: 8192 total in 1 blocks; 8176 free (3 chunks); 16 used
2006-07-10 14:03:24 [27769] ERROR:  out of memory
DETAIL:  Failed on request of size 67108864.
CONTEXT:  PL/pgSQL function "backup_create" line 60 at SQL statement