5.6.1 Concepts & tools
Every entry filed under Concepts & tools and its subtopics.
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- Intermediate 2
- Advanced 0
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- Tutorial 0
- Concept 1
- How-to 0
- Reference 1
- Fix 1
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- 0221 Oracle Database basics: instance vs database, CDB and PDB An Oracle instance is memory and processes; the database is the files on disk. Since 21c every database is a container database… Beginner · Concept · Linux, Windows Article Concepts & tools 15 Oct 2026
- 0222 Connecting to Oracle: SQL*Plus, SQLcl, EZConnect, tnsnames.ora and the listener Clients reach an Oracle database through the listener, using an Easy Connect string or a tnsnames.ora alias. Here are the formats, the… Intermediate · Reference · Linux, macOS, Windows Article Administration · Concepts & tools 15 Oct 2026
- 0226 Fix: ORA-12541: TNS:no listener The client reached the host but nothing was listening on that port. Start or fix the Oracle listener, or correct the host… Intermediate · Fix · Linux, Windows Article Administration · Concepts & tools 15 Oct 2026