> sqlplus /nolog SQL> connect / as sysdba; Connected.
查询当前最大连接数（Oracle默认是150）
SQL> show parameter processes; 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 1000 log_archive_max_processes integer 4 processes integer 150
修改最大连接数（修改为1024，看需求和数据库系统性能而定）
SQL> alter system set processes = 1024 scope = spfile; System altered.
关闭和重启数据库（需要新的参数才能生效）
SQL> shutdown immediate; Database closed. Database dismounted. ORACLE instance shut down. SQL> startup; ORACLE instance started. Total System Global Area 3190132736 bytes Fixed Size 2217584 bytes Variable Size 2382367120 bytes Database Buffers 788529152 bytes Redo Buffers 17018880 bytes Database mounted. Database opened. SQL> select open_mode from v$database; OPEN_MODE -------------------- READ WRITE
重新查询当前最大连接数
SQL> show parameter processes; 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 1000 log_archive_max_processes integer 4 processes integer 1024