Description of each module of the blog
★ Article classification
※ XXX knowledge articles + → basic knowledge
※ XXX architecture articles + → architecture/architecture
※ XXX HA articles + → high availability
※ XXX operation and maintenance articles + → common operation and maintenance scenarios
※ XXX tools articles + → common gadgets
※ XXX Optimization + → Database/SQL Optimization
※ XXX Development + → PL/SQL Development
※ XXX Experimental + → Some experimental data
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