Oracle Database
A connection can disappear because of network equipment, server termination or a session timeout. Establish whether the break follows idleness or an active request.
Connections & Oracle Net2 นาทีในการอ่าน
อ่านบทความ : ORA-03135: investigate a lost connection without assuming idle timeout
Oracle Database
Invalid logon can reflect a wrong secret, wrong target database or unexpected authentication configuration. First establish which service and account the application is using.
Connections & Oracle Net2 นาทีในการอ่าน
อ่านบทความ : ORA-01017: verify the account and service before resetting credentials
Oracle Database
SQL*Plus may connect while the application fails because they load different Oracle clients. Inspect the executable and configuration location in the failing process environment.
Connections & Oracle Net2 นาทีในการอ่าน
อ่านบทความ : Find a mismatched Oracle client home on Linux
Oracle Database
A successful connection can still land in the wrong database, container or service. Capture server identity before investigating missing tables or permissions.
Connections & Oracle Net1 นาทีในการอ่าน
อ่านบทความ : Confirm which Oracle database and container a client reached
Oracle Database
A listener probe and a database login exercise different layers. Treat probe success as a starting point rather than proof of full database availability.
Connections & Oracle Net2 นาทีในการอ่าน
อ่านบทความ : Understand why tnsping succeeds while SQL login fails
Oracle Database
A closed connection during establishment can involve server process startup, authentication or network interception. Collect both ends of the failure before changing Oracle Net settings.
Connections & Oracle Net2 นาทีในการอ่าน
อ่านบทความ : ORA-12537: investigate a connection closed during negotiation
Oracle Database
A connection can fail because the configured target cannot be resolved or reached, including a redirected target name. Inspect every host in the effective descriptor.
Connections & Oracle Net2 นาทีในการอ่าน
อ่านบทความ : ORA-12545: check host names embedded in Oracle connect descriptors
Oracle Database
A connection request that omits required service information can reach the listener and still be rejected. Compare the descriptor with a working supported example.
Connections & Oracle Net1 นาทีในการอ่าน
อ่านบทความ : ORA-12504: supply the intended service in a connect request
Oracle Database
An old client may not support the authentication protocol required by the database. Establish both client and database versions before weakening authentication policy.
Connections & Oracle Net1 นาทีในการอ่าน
อ่านบทความ : ORA-28040: diagnose client authentication compatibility
Oracle Database
A TCPS or HTTPS operation can fail when the trust chain, name or certificate validity is wrong. Identify which wallet and host the failing component actually uses.
Connections & Oracle Net2 นาทีในการอ่าน
อ่านบทความ : ORA-29024: investigate certificate validation in an Oracle connection
Oracle Database
A listener may identify a service but fail to hand the connection to a server process. Correlate the failure with instance resource and operating-system evidence.
Connections & Oracle Net2 นาทีในการอ่าน
อ่านบทความ : ORA-12518: investigate listener handoff failures
Oracle Database
A connection pool leak can slowly consume available sessions even though most sessions are idle. Group sessions by service and application identity.
Connections & Oracle Net2 นาทีในการอ่าน
อ่านบทความ : Detect excessive Oracle application sessions from one client group