Init gangs cost: the duration that is taken to preprocess the execution plan that is generated by the QO and send the query request to the QE to trigger the start query phase. Unit: milliseconds. Start query cost: the duration of the initialization phase, which starts when the Init gangs...
Confession: although this test was added to demonstrate this particular corner-case, I can no longer reproduce the original problem, even if I adjustrustcto do the "wrong" thing. I have spent several hours trying to adjust the case to trigger the "faulty" behavior with no success. This tes...
This itemapplies to NDBCLUSTER tables only. It means that MySQL Cluster is using theCondition Pushdown optimization to improve the efficiency of a directcomparison between a nonindexed column and a constant. In such cases, thecondition is “pushed down” to the cluster's data nodes and is eval...
auto_explain.log_triggers Purpose: This option logs details about triggers fired during query execution. Details: Triggers can have a significant impact on performance, especially if they involve complex operations or if they are fired frequently. Logging trigger activity can help...
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You can find the same trick at work in all kinds of machines and electrical appliances, where sensors are ready to switch things on or off in a fraction of a second using clever magnetic switches called relays. Let's take a closer look at how they work!
Using session target sip-uri triggers DNS resolution of the domain of incoming Invite Req-URI and dynamically determine the session target IP. Example Configuration: The gateway recieves two SIP Invites with these headers Invite sip:testuser@cisco.com:5060 SIP/2.0 Invite sip:testus...
When a packet enters the fabric, the switch looks at the packet to determine if the configuration on the port allows this packet. For example, a frame enters the fabric with an 802.1Q tag of 10. If the switch has VLAN 10 on the port, it inspects the...
Artwork: How an optical smoke detector works.But if a fire breaks out, smoke enters the chamber (6) and scatters some of the light beam (7) into the photocell (3). This triggers the circuit (8), setting off the shrill and nasty alarm (9) that wakes you up and saves your life....
"It's really helpful because it gives you a sense of how sedate your pet's going to be," Fox said. "You don't want your pet overly sedate or under sedate on the day where you actually need the medication to work." On the day of the holiday, experts also suggest tiring your pet...