Dirty read with READ COMMITTED and sql count.

Hi,
Under read committed isolation level a select count(*) ... return 1, in fact the select sees insert during other current transaction, it is typically a dirty read. But a select without count function return 0. Can someone explain me why I have this behaviour ?
the transaction which is making the select count(*)...has read committed isolation level
the transaction which has inserted the new item has read uncommitted isolation level
Please tell me if I am missing something.
I am using Maxdb 7.6.
Thx

Hi there,
ok, I tried again an was actually able to reproduce the behavior
The problem here is the special implementation of the count (*) function.
To get correct results (isolation level wise), you may use count(<primary key>) instead.
So for your example
select count (IDDI) from NONO.APPA
should always deliver the correct result.
The same is true for the other aggreation functions (min/max/avg...) - it's just about the very special count(*) handling here.
I informed our development about this.
thanks for pointing out!
Lars

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: Saved
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names
ip local pool vpnpool 192.168.201.10-192.168.201.50
interface GigabitEthernet0/0
nameif outside
security-level 0
ip address 123.222.222.212 255.255.255.224
interface GigabitEthernet0/1
nameif inside
security-level 100
ip address 192.9.200.254 255.255.255.0
interface GigabitEthernet0/2
nameif dmz
security-level 100
ip address 192.168.100.254 255.255.255.0
interface GigabitEthernet0/3
shutdown
no nameif
no security-level
no ip address
interface GigabitEthernet0/4
shutdown
no nameif
no security-level
no ip address
interface GigabitEthernet0/5
shutdown
no nameif
no security-level
no ip address
interface Management0/0
management-only
nameif management
security-level 100
ip address 192.168.1.1 255.255.255.0
ftp mode passive
dns server-group DefaultDNS
domain-name router.local
object network inside-subnet
subnet 192.9.200.0 255.255.255.0
object network netmotion
host 192.9.200.6
object network inside-network
subnet 192.9.200.0 255.255.255.0
object network vpnpool
subnet 192.168.201.0 255.255.255.192
object network NETWORK_OBJ_192.168.201.0_26
subnet 192.168.201.0 255.255.255.192
object network NETWORK_OBJ_192.9.200.0_24
subnet 192.9.200.0 255.255.255.0
access-list outside_access_in extended permit icmp any4 any4 log disable
access-list Outside_access_in extended permit udp any object netmotion eq 5020
access-list split standard permit 192.9.200.0 255.255.255.0
access-list VPNT_splitTunnelAcl standard permit 192.9.200.0 255.255.255.0
pager lines 24
logging asdm informational
mtu outside 1500
mtu inside 1500
mtu management 1500
mtu dmz 1500
icmp unreachable rate-limit 1 burst-size 1
no asdm history enable
arp timeout 14400
no arp permit-nonconnected
nat (inside,outside) source static inside-network inside-network destination static vpnpool vpnpool
nat (inside,outside) source static NETWORK_OBJ_192.9.200.0_24 NETWORK_OBJ_192.9.200.0_24 destination static NETWORK_OBJ_192.168.201.0_26 NETWORK_OBJ_192.168.201.0_26 no-proxy-arp route-lookup
object network netmotion
nat (inside,outside) static interface service udp 5020 5020
nat (inside,outside) after-auto source dynamic any interface
access-group Outside_access_in in interface outside
route outside 0.0.0.0 0.0.0.0 123.222.222.1 1
timeout xlate 3:00:00
timeout pat-xlate 0:00:30
timeout conn 1:00:00 half-closed 0:10:00 udp 0:02:00 icmp 0:00:02
timeout sunrpc 0:10:00 h323 0:05:00 h225 1:00:00 mgcp 0:05:00 mgcp-pat 0:05:00
timeout sip 0:30:00 sip_media 0:02:00 sip-invite 0:03:00 sip-disconnect 0:02:00
timeout sip-provisional-media 0:02:00 uauth 0:05:00 absolute
timeout tcp-proxy-reassembly 0:01:00
timeout floating-conn 0:00:00
dynamic-access-policy-record DfltAccessPolicy
user-identity default-domain LOCAL
http server enable
http 192.168.1.0 255.255.255.0 management
http 192.9.200.0 255.255.255.0 inside
no snmp-server location
no snmp-server contact
snmp-server enable traps snmp authentication linkup linkdown coldstart warmstart
crypto ipsec ikev1 transform-set ESP-3DES-MD5 esp-3des esp-md5-hmac
crypto ipsec ikev1 transform-set ESP-DES-MD5 esp-des esp-md5-hmac
crypto ipsec ikev1 transform-set ESP-3DES-SHA esp-3des esp-sha-hmac
crypto ipsec ikev1 transform-set ESP-AES-128-SHA esp-aes esp-sha-hmac
crypto ipsec ikev1 transform-set ESP-AES-192-SHA esp-aes-192 esp-sha-hmac
crypto ipsec ikev1 transform-set ESP-AES-128-MD5 esp-aes esp-md5-hmac
crypto ipsec ikev1 transform-set ESP-AES-192-MD5 esp-aes-192 esp-md5-hmac
crypto ipsec ikev1 transform-set ESP-AES-256-SHA esp-aes-256 esp-sha-hmac
crypto ipsec ikev1 transform-set ESP-AES-256-MD5 esp-aes-256 esp-md5-hmac
crypto ipsec ikev1 transform-set ESP-DES-SHA esp-des esp-sha-hmac
crypto ipsec security-association pmtu-aging infinite
crypto dynamic-map SYSTEM_DEFAULT_CRYPTO_MAP 65535 set pfs group5
crypto dynamic-map SYSTEM_DEFAULT_CRYPTO_MAP 65535 set ikev1 transform-set ESP-AES-128-SHA ESP-AES-128-MD5 ESP-AES-192-SHA ESP-AES-192-MD5 ESP-AES-256-SHA ESP-AES-256-MD5 ESP-3DES-SHA ESP-3DES-MD5 ESP-DES-SHA ESP-DES-MD5
crypto map outside_map 65535 ipsec-isakmp dynamic SYSTEM_DEFAULT_CRYPTO_MAP
crypto map outside_map interface outside
crypto ca trustpool policy
crypto ikev1 enable outside
crypto ikev1 policy 10
authentication crack
encryption aes-256
hash sha
group 2
lifetime 86400
crypto ikev1 policy 20
authentication rsa-sig
encryption aes-256
hash sha
group 2
lifetime 86400
crypto ikev1 policy 30
authentication pre-share
encryption aes-256
hash sha
group 2
lifetime 86400
crypto ikev1 policy 40
authentication crack
encryption aes-192
hash sha
group 2
lifetime 86400
crypto ikev1 policy 50
authentication rsa-sig
encryption aes-192
hash sha
group 2
lifetime 86400
crypto ikev1 policy 60
authentication pre-share
encryption aes-192
hash sha
group 2
lifetime 86400
crypto ikev1 policy 70
authentication crack
encryption aes
hash sha
group 2
lifetime 86400
crypto ikev1 policy 80
authentication rsa-sig
encryption aes
hash sha
group 2
lifetime 86400
crypto ikev1 policy 90
authentication pre-share
encryption aes
hash sha
group 2
lifetime 86400
crypto ikev1 policy 100
authentication crack
encryption 3des
hash sha
group 2
lifetime 86400
crypto ikev1 policy 110
authentication rsa-sig
encryption 3des
hash sha
group 2
lifetime 86400
crypto ikev1 policy 120
authentication pre-share
encryption 3des
hash sha
group 2
lifetime 86400
crypto ikev1 policy 130
authentication crack
encryption des
hash sha
group 2
lifetime 86400
crypto ikev1 policy 140
authentication rsa-sig
encryption des
hash sha
group 2
lifetime 86400
crypto ikev1 policy 150
authentication pre-share
encryption des
hash sha
group 2
lifetime 86400
telnet 192.9.200.0 255.255.255.0 inside
telnet timeout 5
ssh timeout 5
ssh key-exchange group dh-group1-sha1
console timeout 0
dhcpd address 192.168.1.2-192.168.1.254 management
dhcpd enable management
threat-detection basic-threat
threat-detection statistics access-list
no threat-detection statistics tcp-intercept
ssl encryption aes128-sha1 3des-sha1
webvpn
enable outside
anyconnect image disk0:/anyconnect-win-2.5.2014-k9.pkg 2 regex "Windows NT"
anyconnect image disk0:/anyconnect-macosx-i386-2.5.2014-k9.pkg 3 regex "Intel Mac OS X"
anyconnect enable
tunnel-group-list enable
group-policy SSLVPN internal
group-policy SSLVPN attributes
dns-server value 192.9.200.13
vpn-tunnel-protocol ssl-client
split-tunnel-policy tunnelspecified
split-tunnel-network-list value split
default-domain value router.local
group-policy VPNT internal
group-policy VPNT attributes
dns-server value 192.9.200.13
vpn-tunnel-protocol ikev1 l2tp-ipsec
split-tunnel-policy tunnelspecified
split-tunnel-network-list value VPNT_splitTunnelAcl
default-domain value router.local
username grimesvpn password 7.wersfhyt encrypted
username grimesvpn attributes
service-type remote-access
tunnel-group SSLVPN type remote-access
tunnel-group SSLVPN general-attributes
address-pool vpnpool
default-group-policy SSLVPN
tunnel-group SSLVPN webvpn-attributes
group-alias SSLVPN enable
tunnel-group VPNT type remote-access
tunnel-group VPNT general-attributes
address-pool vpnpool
default-group-policy VPNT
tunnel-group VPNT ipsec-attributes
ikev1 pre-shared-key *****
class-map inspection_default
match default-inspection-traffic
policy-map type inspect dns preset_dns_map
parameters
message-length maximum client auto
message-length maximum 512
policy-map global_policy
class inspection_default
inspect dns preset_dns_map
inspect ftp
inspect h323 h225
inspect h323 ras
inspect rsh
inspect rtsp
inspect esmtp
inspect sqlnet
inspect skinny
inspect sunrpc
inspect xdmcp
inspect sip
inspect netbios
inspect tftp
inspect ip-options
inspect icmp
service-policy global_policy global
prompt hostname context
no call-home reporting anonymous
Cryptochecksum:36271b5a1b9382621e14c3aa635e2fbb
: end

Hi Vibor. Apologies if my comment was misunderstood. What I meant to say was that the security level of the dmz interface should probably be less than 100.
And therefore traffic could be controlled between DMZ and inside networks.
As per thr security level on the DMZ interface. ....... that command is correct. :-)

A difficult problem with php code and sql code

it's good place to visit(Paged Result Sets with PHP and Oracle)
http://www.oracle.com/technology/pub/articles/oracle_php_cookbook/fuecks_paged.html
maybe below part php code could not be used in above address's php code.
if((isset($l_company) and $l_company != $rows['COMPANY']) or empty($stmt) and empty($total_pages) ) {
echo "<tr bgcolor='#CCFFCC'>";
echo "<td colspan= 3 align='center'>".$l_company."</td>";
echo "<td >".$totalcomany." </td>";
$totalcomany = 0;
echo "<td > </td>";
echo "</tr>";
$l_company = $rows['COMPANY'];
because the same company in one page could calculate sum while if
the same company in two pages could not do that.
and what do you think of ?
thanks !

Hi,
this is because your sql-statement selects only the rows, you need to build this one page.
Neither php nor the given result from your query knows about data wich will be part of the result of another page.
Greetings from Hamburg
Thorsten Körner

Dirty read with READ COMMITTED and sql count.

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