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Each time your program performs a function call, information about the call is generated. That information includes the location of the call in your program, the arguments of the call, and the local variables ..
This script displays the top 50 longest idle times and list distribution of sessions on the instance..
高parse calls表示这些SQL不可以re-used 并且每次执行都要重新解析，理想的最佳状态是一次解析多次执行，你也知道频繁的解析会给library cache带来沉重的负担， 一个sql的执行必须先parse，解析过程包含sql 加载到shared pool, 语法检查…
When multiple connection created will insert a lot of rows in aud$ table, there may be contention in the segment header for the table. This contention can manifest itself as a buffer busy wait or a freelist wait.
top – 14:32:11 up 104 days, 20:27, 1 user, load average: 19.31, 19.10, 19.06 Tasks: 390 total, 19 running, 371 sleeping, 0 stopped, 0 zombie Cpu(s): 99.5%us, 0.1%sy, 0.0%ni, 0.4%id, 0.0%wa, 0.0%hi, 0.0%si, 0.0%st Mem: 8164276k total, 8111804k used, 52472k free, 403596k buffers Swap: 16386292k total, 224k used, 16386068k free, 5560532k cached [root@webxxx ~]# ps … Read more