Introduction to HDFS

What is HDFS? HDFS is a distributed file system that is fault tolerant, scalable and extremely easy to expand. HDFS is the primary distributed storage for Hadoop applications. Hadoop is written in JAVA and is supported on all major platforms. HDFS is designed to ‘just work’, however a working knowledge helps in diagnostics and improvements. … Continue reading Introduction to HDFS

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SQL Patch – fast way to add a hint without changing the code

SQL Patches are internally used by SQL Recovery advisor to fix SQL statements that fail with critical errors at run time. SQL Recovery advisor does this job by patching / hints the SQL statement, basically telling the optimizer to avoid an access path for example. The same undocumented package can also be used to insert … Continue reading SQL Patch – fast way to add a hint without changing the code