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enq: IV - contention

in SQL Performance (MOSC) 11 commentsAnswered

We are observing slowness of sql due to high "enq: IV - contention"(on sequence in select statement) in production server but the same sql is running fine in lower dev instance.

1) What is "enq: IV - contention", and how is it related to sequence execution?

2) Why am I observing the issue in one environment and not in other(both are 12.2)?


| -> 2 | SEQUENCE | SEQ_LIQ_KEY_VALUES | | | 3835 | +13 | 1 | 1M | | | | | . | . | 67.67 | row cache lock (436) |

| | | | | | | | | | | | | | | | | log buffer space (7) |

| | | | | | | | | | | | | | | | | log file switch completion (1) |

| | | | | | | | | | | | | | | | | Cpu (357) |

| | | | | | | | | | | | | | | | | enq: IV - contention (1787) |

| | | | | | | | | | | | | | | | | latch: ges resource hash list (1) |

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