ORA-12511: TNS:service handler found but it is not accepting connections

Cause : The dispatchers notified the listener that they temporarily do not accept new connections.

Action - How to fix it : DBA Scripts :: www.high-oracle.com/scripts

Attempt the connection again. If error persists, contact the DBA to check the state of the dispatchers and/or ask him to increase the number of dispatchers.

update : 23-06-2017

ORA-12511 - TNS:service handler found but it is not accepting connections
ORA-12511 - TNS:service handler found but it is not accepting connections

  • ora-07454 : queue timeout, string second(s), exceeded
  • ora-24340 : cannot support more than 255 columns
  • ora-06902 : CMX: cannot attach to cmx subsystem
  • ora-13362 : disjoint sub-element in a compound polygon
  • ora-28594 : agent control utility: invalid parameter name
  • ora-24414 : Only number sessions could be started.
  • ora-00289 : suggestion : string
  • ora-30553 : The function is not deterministic
  • ora-00204 : error in reading (block string, # blocks string) of control file
  • ora-19230 : XP0010 - unsupported axis string
  • ora-16205 : DDL skipped due to skip setting
  • ora-22334 : cannot reset type "string"."string". Dependent tables must be upgraded to latest version
  • ora-24190 : length of payload exceeds string
  • ora-04004 : MINVALUE must be less than MAXVALUE
  • ora-06107 : NETTCP: ORACLE network server not found
  • ora-24324 : service handle not initialized
  • ora-26029 : index string.string partition string initially in unusable state
  • ora-25215 : user_data type and queue type do not match
  • ora-13155 : invalid number of dimensions specified
  • ora-29655 : USING clause is incompatible with its supertype
  • ora-39047 : Jobs of type string cannot use multiple execution streams.
  • ora-01336 : specified dictionary file cannot be opened
  • ora-02267 : column type incompatible with referenced column type
  • ora-01525 : error in renaming data files
  • ora-07665 : ssrexhd: recursive exception encountered string string string string string string
  • ora-33450 : (ESDREAD05) Discarding compiled code for workspace object because number now has more or fewer dimensions than it had when the code was compiled.
  • ora-07606 : szprv: $CHKPRO failure
  • ora-10652 : Object has on-commit materialized views
  • ora-21780 : Maximum number of object durations exceeded.
  • ora-02806 : Unable to set handler for SIGALRM
  • Oracle Database Error Messages

    Oracle Database High Availability Any organization evaluating a database solution for enterprise data must also evaluate the High Availability (HA) capabilities of the database. Data is one of the most critical business assets of an organization. If this data is not available and/or not protected, companies may stand to lose millions of dollars in business downtime as well as negative publicity. Building a highly available data infrastructure is critical to the success of all organizations in today's fast moving economy.

    Well, the reason for above error is that i have taken the above script from a 11g database and running it on 10g database. 11g has bring some changes in password management. Below code is executed on 11g and user created successfully, which is expected result.