out of memory

Hello,

I've error "out of memory" with these traces :

TopMemoryContext: 32768 total in 3 blocks; 5152 free (1 chunks); 27616 used
TopTransactionContext: 8192 total in 1 blocks; 8136 free (0 chunks); 56 used
DeferredTriggerXact: 0 total in 0 blocks; 0 free (0 chunks); 0 used
MessageContext: 24576 total in 2 blocks; 2688 free (14 chunks); 21888 used
PortalMemory: 8192 total in 1 blocks; 8040 free (0 chunks); 152 used
PortalHeapMemory: 8192 total in 1 blocks; 3936 free (0 chunks); 4256 used
PortalHeapMemory: 23552 total in 5 blocks; 1160 free (4 chunks); 22392 used
ExecutorState: 8192 total in 1 blocks; 3280 free (4 chunks); 4912 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
ExecutorState: 24576 total in 2 blocks; 11264 free (14 chunks); 13312 used
ExprContext: 8192 total in 1 blocks; 8128 free (0 chunks); 64 used
AggContext: -1976573952 total in 287 blocks; 25024 free (414 chunks);
-1976598976 used
DynaHashTable: 503439384 total in 70 blocks; 6804760 free (257 chunks);
496634624 used
ExprContext: 0 total in 0 blocks; 0 free (0 chunks); 0 used
ExprContext: 8192 total in 1 blocks; 8176 free (0 chunks); 16 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
CacheMemoryContext: 516096 total in 6 blocks; 126648 free (2 chunks); 389448
used
test_query: 1024 total in 1 blocks; 640 free (0 chunks); 384 used
test_date: 1024 total in 1 blocks; 640 free (0 chunks); 384 used
query_string_query_string_key: 1024 total in 1 blocks; 640 free (0 chunks); 384
used
query_string_pkey: 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_attrdef_adrelid_adnum_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_shadow_usename_index: 1024 total in 1 blocks; 640 free (0 chunks); 384 used
pg_amop_opr_opc_index: 1024 total in 1 blocks; 320 free (0 chunks); 704 used
pg_conversion_oid_index: 1024 total in 1 blocks; 640 free (0 chunks); 384 used
pg_language_name_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
pg_attribute_relid_attnam_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_cast_source_target_index: 1024 total in 1 blocks; 320 free (0 chunks); 704
used
pg_conversion_name_nsp_index: 1024 total in 1 blocks; 320 free (0 chunks); 704
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_conversion_default_index: 2048 total in 1 blocks; 704 free (0 chunks); 1344
used
pg_class_relname_nsp_index: 1024 total in 1 blocks; 320 free (0 chunks); 704
used
pg_aggregate_fnoid_index: 1024 total in 1 blocks; 640 free (0 chunks); 384 used
pg_inherits_relid_seqno_index: 1024 total in 1 blocks; 320 free (0 chunks); 704
used
pg_language_oid_index: 1024 total in 1 blocks; 640 free (0 chunks); 384 used
pg_type_typname_nsp_index: 1024 total in 1 blocks; 320 free (0 chunks); 704 used
pg_group_sysid_index: 1024 total in 1 blocks; 640 free (0 chunks); 384 used
pg_namespace_oid_index: 1024 total in 1 blocks; 640 free (0 chunks); 384 used
pg_proc_proname_args_nsp_index: 2048 total in 1 blocks; 704 free (0 chunks);
1344 used
pg_opclass_am_name_nsp_index: 2048 total in 1 blocks; 768 free (0 chunks); 1280
used
pg_group_name_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_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_operator_oprname_l_r_n_index: 2048 total in 1 blocks; 704 free (0 chunks);
1344 used
pg_opclass_oid_index: 1024 total in 1 blocks; 640 free (0 chunks); 384 used
pg_rewrite_rel_rulename_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_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; 5712 free (0 chunks); 2480 used
DynaHash: 8192 total in 1 blocks; 6912 free (0 chunks); 1280 used
DynaHashTable: 8192 total in 1 blocks; 2008 free (0 chunks); 6184 used
DynaHashTable: 8192 total in 1 blocks; 5080 free (0 chunks); 3112 used
DynaHashTable: 8192 total in 1 blocks; 2008 free (0 chunks); 6184 used
DynaHashTable: 8192 total in 1 blocks; 3016 free (0 chunks); 5176 used
DynaHashTable: 8192 total in 1 blocks; 4040 free (0 chunks); 4152 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 (6 chunks); 16 used
2006-02-14 16:06:14 [25816] ERROR: out of memory
DETAIL: Failed on request of size 88.
ERROR: out of memory
DETAIL: Failed on request of size 88.

Anybody could help me ??

Thanks a lot

MB