Sessions are bleeding each other

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• Two sessions are locked each other in

  Hi all
  
  My database is Exadata machine. 11.2
  These days, we met a case, it's two sessions is always blocked by the other. I get this info from v$ session blocking_session.
  For examle, the information looks like
  
  event blocking_session sid
  1 locking cache libarary 2
  2 lock hiding 1 row
  
  and as you know there are a lot of other sessions are blocked by sid 1.
  
  In lookiing upwards of v$ sql, I got the SQL for these 2 sessions.
  
  / * QSMQ VALIDATION * / ALTER SUMMARY 'XXXXX '. "" Gxxx_CP_CAL_TIME_TEMP_MV "COMPILATION
  
  / * QSMQ VALIDATION * / ALTER SUMMARY 'XXXXX '. "" Gxxx_CP_CAL_TIME_MV "COMPILATION
  
  Two of these MV 2 share some underlying objects. And both of the 2 sessions began at around the same time.
  If the compilation must face the lock on the object, why the 2 sessions block each other?
  
  Can someone give me some advice, please?
  
  Best regards
  Leon

  event blocking_session sid
  1 locking cache libarary 2
  2 lock hiding 1 row

  These aren't waiting for line lock (TX Enqueue waits). These are expectations about the dictionary cache - for example to prevent the DDL (ALTER, COMPILE, CREATE etc.) running while DML is still ongoing. This ensures that dependencies are maintained.

  (if you have a transaction that retrieves 4 columns in a table and another session adds or deletes a column, while the transaction is in progress? how oracle would ensure that the "structure" of the table remains consistent? the DOF is prevented and waits for a lock on the library cache).

  The cache line is the data dictionary cache.

  Hemant K Collette

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• 2 vSpheres cannot ping each other that are built on vSphere.

  On host A, which is vSpere 4.0, made up of two hosts who are vSpheres 4.0 with vSwitch. Each can ping itself, but cannot ping each other, too, cannot ping A host. After that the two hosts are moved to dvSwich, has achieved some results. But another VM on the dvSwitch is fine.

  Moreover, I need to practice the vHA and vmotion. So, I need two some configuration for her guests. As a result, I built two hosts on A host.

  How can I solve this problem?

  Thank you!

  George

  George,

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• ORA-12721: operation cannot be performed when other sessions are active

  Hello
  I started my database like this:

  1) Change INIT.ORA file;  unset parallel_server parameter.
  2) Execute these commands:
  STARTUP MOUNT ;
  ALTER SYSTEM ENABLE RESTRICTED SESSION;
  ALTER SYSTEM SET JOB_QUEUE_PROCESSES=0;
  ALTER SYSTEM SET AQ_TM_PROCESSES=0;
  ALTER DATABASE OPEN;
  SHUTDOWN IMMEDIATE;
  
  SQL> STARTUP RESTRICT  pfile='C:\oracle\product\10.2.0\db_1\database\initORCL.ora';
  ORACLE instance started.
  
  
  SQL> alter database national character set INTERNAL_CONVERT UTF8;
  alter database national character set INTERNAL_CONVERT UTF8
  *
  ERROR at line 1:
  ORA-12721: operation cannot execute when other sessions are active

  Sorry for the duplicate.
  
  Published by: user522961 on December 10, 2008 01:51

  >
  ORA-12721: operation cannot be performed when other sessions are active
  Cause: This command can only be run when there is no other active sessions
  Action: Ensure that there is no other connections to the database >
  HTH
  Aman...

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• ASA - Tunnel all traffic, allow rays to communicate with each other

  Well, I hope someone can help me with this headache! Switching to employ a PIX and VPN 3005 concentrator Office at home in an ASA5510 for firewall and IPSEC tunnels. It is pretty much a

  • VPN on a stick, multiple rays.
  • All traffic sent by tunnel
  • Internet access through main office (using the web filter) of
  • VOIP to VOIP between rays
  • All departments are using the clients VPN 3005 HW or ASA 5505 s

  HEADQUARTERS: 10.0.0.0/24

  Speaks 1: 192.168.11.0 / 24

  Speaks 2: 192.168.12.0 / 24

  Speaks 3: 192.168.13.0 / 24

  -continues to 192.168.31.0 / 24

  Spoke with the current configuration, 1 can communicate with all the resources in the home, office and Internet integrated properly checked by a tracert. However, the rays cannot communicate with each other. This is required for VOIP traffic, when all TALK TALK calls are made (sites).

  Logging information when talk of talks initiated icmp:

  • No group of translation found for icmp src, dst outside: 192.168.31.1 inside: 192.168.11.1 (type 8, code 0)

  If I remove the nat (outside) 1 192.168.0.0 255.255.00 - rays will begin to respond to each other, but then the rays cannot tunnel through the Home Office Internet traffic. My brain is so scrambled after the cramming of VPN configurations for these days, so I hope someone has an idea. I've always used concentrators 3005, so it's a little different! In the search for documentation for this configuration, I was surprised that this isn't a most common topology. It seems that this article would (http://www.cisco.com/en/US/products/ps6120/products_configuration_example09186a00805734ae.shtml), but there is no rays! In any case, I'm sure this has something to do with NAT rules and perhaps who need access for traffic list speaks of talking.

  =============================================

  ASA Version 8.2 (1)
  !
  hostname asa5510

  interface Ethernet0/0
  Speed 100
  full duplex
  nameif outside
  security-level 0
  IP address 97.65.x.x 255.255.255.224

  interface Ethernet0/1
  Speed 100
  full duplex
  nameif inside
  security-level 100
  IP 10.0.0.40 255.255.0.0

  permit same-security-traffic inter-interface

  permit same-security-traffic intra-interface

  the DM_INLINE_NETWORK_1 object-group network
  object-network 10.0.0.0 255.255.0.0

  object-network 192.168.0.0 255.255.0.0

  access-list sheep extended ip 10.0.0.0 allow 255.255.0.0 192.168.0.0 255.255.0.0

  Allow Access-list extended wccp servers ip host 10.0.0.83 a

  Redirect traffic extended access-list deny ip any object-group DM_INLINE_NETWORK_1

  Redirect traffic scope permitted any one ip access-list

  Global 1 interface (outside)
  NAT (outside) 1 192.168.0.0 255.255.0.0
  NAT (inside) 0 access-list sheep
  NAT (inside) 1 10.0.0.0 255.255.0.0

  Route outside 0.0.0.0 0.0.0.0 97.65.x.x 1
  Route inside 192.168.0.0 255.255.255.0 10.0.0.1 1
  Route inside 192.168.2.0 255.255.255.0 10.0.0.1 1
  Route inside 192.168.3.0 255.255.255.0 10.0.0.1 1

  Crypto ipsec transform-set esp-3des esp-md5-hmac RIGHT
  life crypto ipsec security association seconds 28800
  Crypto ipsec kilobytes of life - safety 4608000 association
  Crypto ipsec df - bit clear-df outdoors

  Crypto-map dynamic dynmap 1 transform-set RIGHT

  map mymap 65535-isakmp ipsec crypto dynamic dynmap

  mymap outside crypto map interface

  crypto isakmp identity address

  crypto ISAKMP allow outside

  crypto ISAKMP policy 5
  preshared authentication
  3des encryption
  sha hash
  Group 2
  life 86400

  crypto ISAKMP policy 10
  preshared authentication
  3des encryption
  md5 hash
  Group 2
  life 86400

  crypto ISAKMP ipsec-over-tcp port 10000

  management-access inside

  a basic threat threat detection

  no statistical access list - a threat detection
  no statistical threat detection tcp-interception

  WCCP web cache redirect-list Redirect-traffic group-list password xxxxxxx wccp-servers
  WCCP 90 redirect-list traffic Redirect wccp servers group-list password xxxxxxx

  WebVPN

  internal MJHIvpn group strategy

  attributes of Group Policy MJHIvpn
  value of server WINS 10.0.10.1 10.0.10.2
  value of 10.0.10.1 DNS server 10.0.10.2
  allow password-storage
  Split-tunnel-policy tunnelall
  mjhi.local value by default-field
  allow to NEM

  username field-3002 SjfS1Pq2xZGxHicx encrypted password

  attributes of username field-3002
  VPN-access-hour no
  VPN - 250 simultaneous connections
  VPN-idle-timeout no
  VPN-session-timeout no
  Protocol-tunnel-VPN IPSec
  allow password-storage
  type of remote access service

  remote access to field tunnel-group type

  General-field tunnel-group attributes
  Group Policy - by default-MJHIvpn

  IPSec-attributes of tunnel-group field
  pre-shared-key *.

  class-map inspection_default
  match default-inspection-traffic
  !
  !
  type of policy-card inspect dns preset_dns_map
  parameters
  message-length maximum 512
  Policy-map global_policy
  class inspection_default
  inspect the preset_dns_map dns
  inspect the ftp
  inspect h323 h225
  inspect the h323 ras
  inspect the rsh
  inspect the rtsp
  inspect sqlnet
  inspect the skinny
  inspect sunrpc
  inspect xdmcp
  inspect the sip
  inspect the netbios
  inspect the tftp
  inspect the they
  inspect the icmp
  !
  global service-policy global_policy

  Hello Ala,

  In Act got to be with the Nat configuration.

  So basically you want to tunnel the traffic on the rays to communicate with each other.

  OK, it would be with a nat 0 with the access list with the corresponding traffic outside.

  Also on the crypto ACL for each site configuration, you must add an entry for the traffic of other offices.

  I hope that I have explained myself.

  Have a good

  Julio

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