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Event Monitor (EMON) slave process is consuming CPU. Multiple stacks from the process obtained via connect / as sysdba oradebug setospid 1379 or use t 阅读全文
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Hard parse time may be impacted when there are a high number of parse errors.This may be noted in the ADDM report as follows: FINDING 2: 62% impact (2 阅读全文
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How to Restore a Whole Table It's a classic rookie mistake: running a delete without a where clause. And then committing it! Here you need to recover 阅读全文
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表的连接方式 USE_NL Hint For example: USE_HASH Hint For example: USE_MERGE Hint For example: 表的访问路径 FULL Hint For example: INDEX Hint For example: INDEX_FFS 阅读全文
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SYMPTOMS 1. There is a performance slow down with a large number of waits for 'enq HW - contention'. 2. ASH Reports shows the wait event 'enq HW - con 阅读全文
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When running an OLTP systems, it is possible to see high TX enqueue contention on index associated with tables, which are having high concurrency fr 阅读全文