A wait for the Oracle TX enqueue in mode 6 (row lock contention) is a common enqueue wait, and occurs when a transaction tries to update or delete rows that are currently locked by another transaction.
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Hot blocks are a common cause of cache buffers chains latch contention and can significantly impact performance. Learn some workarounds for this.
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Inefficient SQL statements are the main cause of Oracle cache buffers chains latch contentions and should be considered when performance tuning.
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Contentions for the shared pool and library cache latches are mainly due to intense hard parsing. Learn mroe about how this impacts performance.
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Oracle latch free wait events mean the process failed to obtain the latch in the willing-to-wait mode after spinning _SPIN_COUNT times and went to sleep. Learn more about what this can mean.
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The Oracle DB_FILE_DIRECT_IO_COUNT initialization parameter can impact the direct path read performance in several ways.
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Oracle physical I/O is about more than physical disks and I/O subsystem; it is also about the stuff that goes on inside when blocks are being read into the SGA.
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A higher DB_FILE_MULTIBLOCK_READ_COUNT (MBRC) number can influence the Oracle optimizer to lean toward full table scans. Learn how this affects performance.
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There are four primary reasons why you see Oracle DB File Sequential Read wait events in a full scan operation. Learn more.
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To minimize the Oracle db file sequential read waits you can optimize the SQL statement or reduce the average wait time. Learn more.
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The Oracle db file sequential read wait event is initiated by SQL statements that perform single-block read operations. Learn when these waits may indicate a need for tuning.
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While Oracle trace event 10046 is good for tracing processes,learn why it doesn’t meet the always-on and low overhead requirement necessary for continuous performance monitoring.
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