Explore 2246 articles on AI, cybersecurity, networking and IT. 25 detailed practical guides now include concrete inputs, step-by-step procedures, expected results and troubleshooting. The remaining 2221 articles retain their existing content.
Defend against AI-assisted attacks with practical guidance for cybersecurity and network professionals. Ten reading paths contain 20 articles each, with threat scenarios, evidence requirements, control designs and authorized validation plans. The collection includes protection for AI systems used by defenders and businesses. Behavioral evidence is kept separate from claims about an attacker's use of AI.
Build reliable agents and run language models on your own infrastructure. Explore 160 AI Agents techniques and 140 Local LLM techniques across 15 reading paths, with 20 techniques per path. Each guide includes an implementation action, a validation exercise, platform context and official documentation for further reading.
Diagnose stale reports, late logs, slow queries and unreliable alerts. Explore 40 Power BI articles, 40 Splunk articles, 40 SQL Server articles, plus 20 each on PostgreSQL, MySQL, pipeline freshness and data quality, and alerting and observability. Each guide connects a specific symptom to evidence, a focused correction and validation.
Prepare for CCNA 200-301 v1.1 with 100 focused topics, each paired with a recall guide and an original practice exercise. Build understanding through packet tracing, subnet calculations, lab evidence, troubleshooting and spaced review. These are independent study guides; 200 is the collection size, not the number of questions on the exam.
Reviewed 2 November 2026. Check Cisco’s current exam information before booking. Reading paths are study groupings and do not represent official exam weights.
Ten focused reading paths with 20 articles each. Start from routing and fabric behavior, then explore transport, name resolution, security, host performance, storage, availability and incident evidence.
Choose a platform to explore 50 guides, from a first task brief to reusable workflows. Microsoft Copilot guides cover the consumer and Microsoft 365 experiences; in-app features depend on your account and license.
Oracle Database
A transaction wait often reflects another session's uncommitted work, but TX waits have several causes. Match the event with blocker and object evidence.
Read article : Diagnose enq: TX - row lock contention in contextOracle Database
An INACTIVE session can retain an open transaction while its application waits for user input or abandons a request.
Read article : Find idle sessions that still hold transactionsOracle Database
A transaction can hold locks and generate undo for much longer than the visible user request. Collect its age and scale before planning a stop.
Read article : Assess a long-running transaction before interventionOracle Database
A cancelled operation may be reported after a user action, driver timeout or application cancellation. The cancellation message does not explain why execution took too long.
Read article : ORA-01013: distinguish user cancellation from the cause of slownessOracle Database
A session-killed error can follow an administrator action, resource enforcement or another managed operation. Preserve the time and account context.
Read article : ORA-00028: investigate why a session was terminatedOracle Database
Host CPU or a trace file may name a process rather than a database session. Join the session and process views before escalating.
Read article : Map an Oracle session to its server processOracle Database
A session ceiling can reject new work even while existing sessions appear idle. Measure usage and explain which client groups own it.
Read article : ORA-00018: investigate the maximum session limitOracle Database
New logins can fail when the instance cannot allocate another process slot. Existing connections may still let an authorized DBA collect evidence.
Read article : ORA-00020: investigate Oracle process exhaustionOracle Database
One account may be unable to open another session while the database has capacity. Inspect its assigned profile and session limit.
Read article : ORA-02391: check a user's concurrent-session profile limitOracle Database
A server-enforced idle limit can leave the client holding a connection that fails when reused. Check the account profile and pool lifecycle.
Read article : ORA-02396: handle an idle-time limit in a connection poolOracle Database
An event name can remain visible when a session is no longer waiting. Interpret the event together with its state and wait class.
Read article : Read Oracle session wait state without confusing past and current waitsOracle Database
A local session view can identify a blocker on another RAC instance without showing that session's full details. Preserve instance identity in every lookup.
Read article : Find blocking sessions across RAC instancesOur original short guides to AI, account protection, and recovery.