- What is experiencing issues?
__ Application(s): ____________________________________
__ Client\schema: ___________________________________
__ Client Database Tool(s):____________________________
__ Did anything on the client or application change since last time it worked? __ ARE YOU SURE?
__ Is the application software connection method (class\config\library) up-to-date (ODBC, JDBC, OCI etc.)?
- Are there any network issues?
__ Can you ping the database from the effected clients? __ Any lost packets?
__ Is the DNS name resolving (via nslookup)?
__ Can you ping the database port (1521: use telnet or paping.exe to do this)?
__ Is the network appliance firmware up-to-date?
- Are there any server issues?
__ CPU, __ Disk Space, __ Network (hosts, routes, IP\subnet\gateway), __RAM
__ OS Error Logs OK?
__ Any rogue applications running on Oracle server (monitoring software, security scans, virus scans)?
__ Are the OS patches up-to-date?
- Are there any SAN, RAID or Disk I\O issues?
Oracle ideally requires 1ms read and 5ms write times.
- UNIX\LINUX = mpstat
- Windows = Performance Monitor
- Are there any database issues?
__ Alert log and trace files OK?
__ Listener log OK?
__ Service(s) all running?
__ Connect to database from database server OK?
__ Connect to database from DBA connection tool and\or client OK?
__ Database state OK (OPEN)?
__ Is the schema locked?
__ Are the database patches up-to-date?