When users complain that “the database is slow,” the culprit is not always an inefficient execution plan. Very often, it’s concurrency—sessions waiting on locks—silently throttling throughput. This post is a field-ready playbook based on the diagnostic queries you shared, refactored, explained, and sequenced into an end-to-end workflow. Use it to see blocking, measure impact, identify […]
Empowering the Optimizer with Precision at Every Change In the symphony of data, timing is everything. The modern enterprise pulses with an unceasing flow of transactions—millions of data changes racing through OLTP engines. Amid this dynamism, the Oracle optimizer stands as a maestro, orchestrating query performance. Yet, its brilliance is shadowed if it relies on […]
Oracle Database 19c represents the culmination of years of innovation in the Oracle 12c product line, delivering a suite of enhancements that elevate the humble SELECT statement from a straightforward data retrieval mechanism into an intelligent, self-optimizing, and JSON-aware powerhouse. In this deep-dive blog post, we’ll explore each of these advancements in detail, illustrate them […]
In Oracle Database 19c, the optimizer introduces a powerful feature called SQL Quarantine. This feature prevents recurring execution of problematic SQL statements that consume excessive resources or cause performance degradation. By automatically detecting high-resource SQL statements and placing them into quarantine, Oracle ensures that such queries cannot repeatedly impact system performance. This feature is especially […]