ORA-12519, TNS:no appropriate service handler found The Connection

ORA-12519, TNS:no appropriate service handler found The Connection

ORA-12519, TNS:no appropriate service handler found The Connection descriptor used by the client was: localhost:1521:xe

Uma exceção é gerada durante a execução de um programa utilizando threads. Verifiquei que quando eu colocava para rodar com apenas uma thread, o erro não ocorria, o que me levou a acreditar que o problema estivesse relacionado com a quantidade de conexões simultâneas.

Pesquisei no google e encontrei o seguinte comando para exibir a quantidade máxima de processos suportadas por um banco Oracle:

show parameter processes

No meu caso, eu estava com uma instalação padrão do Oracle XE e o retorno da consulta acima foi o seguinte:

NAME                                               TYPE        VALUE                                                                                                
-------------------------------------------------- ----------- ---------------------------------------------------------------------------------------------------- 
aq_tm_processes                                    integer     0                                                                                                    
db_writer_processes                                integer     1                                                                                                    
gcs_server_processes                               integer     0                                                                                                    
global_txn_processes                               integer     1                                                                                                    
job_queue_processes                                integer     4                                                                                                    
log_archive_max_processes                          integer     4                                                                                                    
processes                                          integer     100

Executei o seguinte comando para aumentar o número de processos:

ALTER SYSTEM SET PROCESSES=500 SCOPE=SPFILE; 

Como eu estou fazendo testes com um número grande de threads, deixei esse valor bem elevado. O erro não ocorreu novamente.

Importante: Essas alterações só surtirão efeito após o banco ser reinicializado.

Uma razão pela qual este problema ocorre é que o Oracle não conta o número de processos em tempo real, ele conta os processos ativos periodicamente. Além disso, esse erro pode ocorrer mesmo que o número real de processos ativos não tenha atingido o valor máximo.

Boa sorte.

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