近日構建的Web應用用戶數量有所上升，后台總是打印無法打開數據庫連接的錯誤信息；
000000a3 SystemOut O 2016 9月 28 08:59:24,486 ERROR - msg:打開數據庫出錯.
經查詢發現需要更改數據庫的連接進程數，修改方法如下：
1、以管理員身份登錄sqlplus
win+R，輸入cmd，然后回車。
在命令行中輸入：sqlplus / as sysdba
2、查看連接進程數量設置值
命令：show parameter processes;
3、查看會話數量設置值
命令：show parameter sessions;
4、修改連接進程數量設置值
命令：alter system set processes=5000 scope=spfile;
操作記錄：
C:\Users\Administrator>sqlplus / as sysdba SQL*Plus: Release 11.2.0.1.0 Production on 星期三 9月 28 11:57:26 2016 Copyright (c) 1982, 2010, Oracle. All rights reserved. 連接到: Oracle Database 11g Enterprise Edition Release 11.2.0.1.0 - 64bit Production With the Partitioning, OLAP, Data Mining and Real Application Testing options 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 NAME TYPE ------------------------------------ ---------------------- VALUE ------------------------------ 1000 log_archive_max_processes integer 4 processes integer 150 SQL> show parameter session; NAME TYPE ------------------------------------ ---------------------- VALUE ------------------------------ java_max_sessionspace_size integer 0 java_soft_sessionspace_limit integer 0 license_max_sessions integer 0 license_sessions_warning integer 0 session_cached_cursors integer NAME TYPE ------------------------------------ ---------------------- VALUE ------------------------------ 50 session_max_open_files integer 10 sessions integer 248 shared_server_sessions integer SQL> alter system set processes=600 scope=spfile; 系統已更改。
操作結果：
SQL> show parameter session; NAME TYPE ------------------------------------ ---------------------- VALUE ------------------------------ java_max_sessionspace_size integer 0 java_soft_sessionspace_limit integer 0 license_max_sessions integer 0 license_sessions_warning integer 0 session_cached_cursors integer NAME TYPE ------------------------------------ ---------------------- VALUE ------------------------------ 50 session_max_open_files integer 10 sessions integer 924 shared_server_sessions integer 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 NAME TYPE ------------------------------------ ---------------------- VALUE ------------------------------ 1000 log_archive_max_processes integer 4 processes integer 600 SQL>