my boss want to migrate to ORACLE

Hi everyone,

somebody can help me??????? my boss want to migrate to
ORACLE................

we have a BIG problem of performance,it's slow....
we use postgres 7.3 for php security application with approximately 4
millions of insertion by day and 4 millions of delete and update
and archive db with 40 millions of archived stuff...

we have 10 databases for our clients and a centralized database for the
general stuff.

database specs:

double XEON 2.4 on DELL PowerEdge2650
2 gigs of RAM
5 SCSI Drive RAID 5 15rpm

tasks:

4 millions of transactions by day
160 open connection 24 hours by day 7 days by week
pg_autovacuum running 24/7
reindex on midnight

postgresql.conf:

tcpip_socket = true
#ssl = false

max_connections = 256
#superuser_reserved_connections = 2

#port = 5432
#hostname_lookup = false
#show_source_port = false

#unix_socket_directory = ''
#unix_socket_group = ''
#unix_socket_permissions = 0777 # octal

#virtual_host = ''

#krb_server_keyfile = ''

#
# Shared Memory Size
#
#shared_buffers = 256 # min max_connections*2 or 16, 8KB each
#shared_buffers = 196000 # min max_connections*2 or 16, 8KB
each
shared_buffers = 128000 # min max_connections*2 or 16, 8KB each
#max_fsm_relations = 1000 # min 10, fsm is free space map, ~40 bytes
max_fsm_pages = 1000000 # min 1000, fsm is free space map, ~6 bytes
#max_locks_per_transaction = 64 # min 10
#wal_buffers = 8 # min 4, typically 8KB each

#
# Non-shared Memory Sizes
#
#sort_mem = 32168 # min 64, size in KB
#vacuum_mem = 8192 # min 1024, size in KB
vacuum_mem = 65536 # min 1024, size in KB

#
# Write-ahead log (WAL)
#
#checkpoint_segments = 3 # in logfile segments, min 1, 16MB each
#checkpoint_timeout = 300 # range 30-3600, in seconds
#
#commit_delay = 0 # range 0-100000, in microseconds
#commit_siblings = 5 # range 1-1000
#
#fsync = true
#wal_sync_method = fsync # the default varies across platforms:
# # fsync, fdatasync, open_sync, or
open_datasync
#wal_debug = 0 # range 0-16

#
# Optimizer Parameters
#
#enable_seqscan = true
#enable_indexscan = true
#enable_tidscan = true
#enable_sort = true
#enable_nestloop = true
#enable_mergejoin = true
#enable_hashjoin = true

#effective_cache_size = 1000 # typically 8KB each
effective_cache_size = 196608 # typically 8KB each
#random_page_cost = 4 # units are one sequential page fetch cost
#cpu_tuple_cost = 0.01 # (same)
#cpu_index_tuple_cost = 0.001 # (same)
#cpu_operator_cost = 0.0025 # (same)

#default_statistics_target = 10 # range 1-1000

#
# GEQO Optimizer Parameters
#
#geqo = true
#geqo_selection_bias = 2.0 # range 1.5-2.0
#geqo_threshold = 11
#geqo_pool_size = 0 # default based on tables in statement,
# range 128-1024
#geqo_effort = 1
#geqo_generations = 0
#geqo_random_seed = -1 # auto-compute seed

#
# Message display
#
server_min_messages =notice # Values, in order of decreasing detail:
# debug5, debug4, debug3, debug2, debug1,
# info, notice, warning, error, log,
fatal,
# panic
client_min_messages =notice # Values, in order of decreasing detail:
# debug5, debug4, debug3, debug2, debug1,
# log, info, notice, warning, error
#silent_mode = false

#log_connections =true
#log_pid =true
#log_statement =true
#log_duration =true
#log_timestamp =true

log_min_error_statement =error
# Values in order of increasing severity:
# debug5, debug4, debug3, debug2, debug1,
# info, notice, warning, error,
panic(off)

#debug_print_parse = false
#debug_print_rewritten = false
#debug_print_plan = false
#debug_pretty_print = false

#explain_pretty_print = true

# requires USE_ASSERT_CHECKING
#debug_assertions = true

#
# Syslog
#
syslog = 0 # range 0-2
syslog_facility = 'LOCAL0'
syslog_ident = 'postgres'

#
# Statistics
#
show_parser_stats = false
show_planner_stats =false
show_executor_stats = false
show_statement_stats =false

# requires BTREE_BUILD_STATS
#show_btree_build_stats = false

#
# Access statistics collection
#
stats_start_collector = true
stats_reset_on_server_start = false
stats_command_string = true
stats_row_level = true
stats_block_level = true

#
# Lock Tracing
#
#trace_notify = false

# requires LOCK_DEBUG
#trace_locks = false
#trace_userlocks = false
#trace_lwlocks = false
#debug_deadlocks = false
#trace_lock_oidmin = 16384
#trace_lock_table = 0

#
# Misc
#
#autocommit = true
#dynamic_library_path = '$libdir'
#search_path = '$user,public'
#datestyle = 'iso, us'
#timezone = unknown # actually, defaults to TZ environment
setting
#australian_timezones = false
#client_encoding = sql_ascii # actually, defaults to database encoding
#authentication_timeout = 60 # 1-600, in seconds
#deadlock_timeout = 1000 # in milliseconds
#default_transaction_isolation = 'read committed'
#max_expr_depth = 10000 # min 10
#max_files_per_process = 1000 # min 25
#password_encryption = true
#sql_inheritance = true
#transform_null_equals = false
#statement_timeout = 0 # 0 is disabled, in milliseconds
#db_user_namespace = false

****************************************************************************
***************************************************************************

Stephane Tessier, CISSP
Development Team Leader
450-430-8166 X:206