Operations and Processes (22%)

DY0-001 · 66 questions

• An agency director says to use a newer method on the inspection data and gives no decision, no cost for a missed violation, and no cost for a false flag. What should the analysts do first?
• A telecom team replaces subscriber identifiers with tokens before a data share, and it keeps the key that maps every token back to a person. What is still true of that share?
• A bank celebrates a model KPI that counts how many campaign emails were sent. The decision the model is meant to support is which customers to offer a fee waiver. What is wrong with that KPI?
• A factory wants to know whether a new torque check cuts rework. One study only records which lines already use the check. A second study assigns the check at random to lines for a month and then compares rework. What is the defining difference in the second study?
• A streaming studio studies a log written by the billing system each time a paid subscription starts, renews, or cancels. Subscribers were not asked to recall a purchase. Which description fits the log?
• A bank analyst is about to email an outside vendor a file of customer legal names paired with account numbers. Which handling is required before that file leaves the bank?
• An assembly plant emails a voluntary safety survey to every shift. Workers who distrust management tend not to answer, and the replies that arrive are mostly favorable. What limitation does this survey have?
• A hospital plans a public table of rare diagnoses broken out by postal code and age in years, and several cells would contain a single patient. What should that release do?
• A telecom buyer holds a supplier price list marked proprietary and licensed for that buyer's staff only. A partner asks for a copy to use in its own bids. What is the right handling?
• A bank pays for a commercial credit-attribute feed for its model shop. The contract allows internal scoring displays. It forbids using the feed to train or retrain a model that will be sold, and it forbids sending the feed to a partner. What is the accurate reading after the invoice is paid?
• A freight carrier can keep a simple route-time model or pay to run a much heavier model that cuts a little error. The money saved by that smaller error is less than the heavier model's operating cost. Which choice follows from the comparison?
• A logistics carrier receives shipment messages from many partners. Some messages nest a list of packages inside the shipment, and some omit the customs field entirely. The team needs a format that keeps both of those differences. Which description fits that format?
• A refrigerated trucking firm records trailer temperature every minute from a probe mounted inside each trailer. Drivers are not asked to write the temperatures down. What kind of data is this series?
• A retail chain stores years of item sales in one wide table, and analysts usually request only store, date, and revenue. The platform team wants a layout that reads those fields without walking every field of every row the way a plain text table does. Which layout matches that need?
• A news publisher fit a revenue model only on weeks whose ad spend stayed inside a familiar band. Editors now want a forecast for a spend far above every week in that fit. What is the problem with using the model there?
• A regional bank must move older wire-transfer files out of the hot query store because investigators rarely open them, yet a fraud review months later still needs a copy that can be retrieved. Which action meets both needs?
• A mobile carrier trains a deep network whose runtime is dominated by large matrix multiplications over many examples. The lab can add hardware for that training job. Which addition matches the workload?
• A logistics warehouse rebuilds its stored on-hand inventory table from the source system every night, and morning analysts need the name for that cadence before they trust the report. Which concept states how often the stored table is brought up to date?
• A telecom analyst studies why customers leave by reusing the billing system's service-change tables. Those tables were built so the company could invoice and provision lines, and several fields the study needs were never captured. What kind of source is this, and what limit comes with it?
• A telecom planner downloads a drive-test dataset that anyone can fetch from a public archive. The file's license allows research and forbids using the measurements in a commercial planning product. Why is public access not permission enough to build that product?
• A bank will not ship real wire-transfer rows to an outside modeler, so it shares a synthetic set built to resemble those wires. The vendor can take the synthetic file under a lighter review. Rare mule patterns that show up only occasionally in the real book are absent from the file. What tradeoff did the bank accept?
• A media platform runs ingest, then clean, then publish. When the clean step fails, the team wants that step tried again, and it does not want publish to start before clean succeeds. Which capability provides that control?
• A public-health agency job reads nearly every column of a huge history table. The profiler shows the job spends most of its time waiting on storage reads, with the processor mostly idle. Which change matches that bottleneck?
• A factory is starting a project to reduce unplanned downtime. A new analyst wants to choose a model family before anything else is written down. Where should this life cycle begin?
• A logistics auditor asks where the field adjusted miles came from and which cleaning rule changed the raw odometer reading into that stored value. The pipeline team needs the record that answers both parts. What should they open?
• A media platform has two jobs. One updates a live viewer dashboard from clicks as each click arrives. The other rebuilds yesterday's viewing table from a closed set of files. Which pairing of processing styles fits the two jobs?
• An agency evaluates a model meant to flag incomplete grant applications. Accuracy looks high, but the labels mark formatting complaints, not missing required documents. What should the workflow do next?
• At a bank, a new analyst receives a feature function and cannot tell which loan columns it requires or which column it returns. What is missing?
• A factory team reruns a defect model months later and cannot tell which tree depth and learning rate produced the saved scores. Which practice would have closed that gap?
• A wireless carrier's churn model rebuilds the same expensive call-detail aggregates at the start of every training run, even though those aggregates rarely change. The next runs should read the finished values. Which practice fits?
• A telecom billing pipeline converts call duration using 60 seconds to the minute, and a known case of 120 seconds must become 2 minutes. A later edit could change that conversion unnoticed until invoices shift. Which practice stops the silent change?
• A retail bank must rebuild account features for the full saved history after a definition change. The job can finish overnight and must not sit on the path that scores each new transaction as it arrives. Which processing path fits?
• A mortgage bank keeps loan packets as PDFs, photos of checks, and recordings of applicant calls. The objects do not share one set of columns, and staff fetch each object by an identifier. Which store fits these objects?
• A bank needs a standing structure for who owns customer tables, which quality rules apply, and how datasets are cataloged. A teammate hears that request as another round of model training. Which description fits the request?
• A logistics air-cargo team versions every training script, then cannot reproduce last month's delay model because the feature table and the saved weights were overwritten in place. What else needed a version history?
• A media company computes a daily unique-viewer rate from a play log. The same viewer is written twice whenever a player retries, so the rate treats one person as two viewers. What must happen before that rate is computed?
• A logistics warehouse merges scan times from three partners. One file writes month-day-year text, another writes day-month-year text, and the third writes year-month-day text. Sorted as raw strings, March scans land in the wrong place. What must happen before the scans are ordered on a calendar?
• A logistics desk must link shipment scans to carrier invoices. A scan names the carrier Northline Freight while the invoice says Northline Frieght, so an exact key match drops the pair. Which join still links those two records?
• A utility keeps analysis scripts on personal laptops and in email attachments. Two analysts overwrite each other's changes and cannot recover the earlier script. Where should that source code live?
• A telecom call-center application needs a churn score while the agent is on the phone, and the training code must stay in the data lab. How should the application obtain the score?
• A retail chain joins daily receipts to a loyalty-profile table on card number. Shoppers who paid without a loyalty card disappear from the sales report, so weekend totals no longer match the register. Which change keeps every receipt and attaches a profile only when a card matches?
• A telecom feed shows two spikes. One matches a logged congestion incident and the neighboring links moved with it. The other is a single probe that jumped to an impossible reading while every neighbor stayed flat. Which handling fits the evidence?
• A bank plans to ship a scoring library inside a mobile app that customers install. The library's license forbids redistributing it inside a product the bank gives to customers. What does that license do to the plan?
• A telecom team finds that one tower's overnight signal feed is shifted low on every row, while three other towers each have a single garbled row and the rest of the rows look normal. How should the two problems be described?
• A bank fraud model is dominated by a few genuine but enormous transfer amounts. The team wants to keep every account row and cap those amounts at a high cutoff. Which treatment is that?
• A bank stores applicant income as 999999 whenever that field was never collected, and an analyst is about to average the income column for a credit model. What do those 999999 entries represent?
• A media streaming team wants a new homepage recommendation model live tonight. The offline suite that scores ranking quality on last month's holdout has not been run. What should happen before the model is promoted?
• A logistics planner adds pallet weights from two depots into one trailer total. One depot records pounds and the other records kilograms, and the summed figure sits far above the trailer's real load. What must happen before those weights are added?
• A media company promoted a caption model after a strong offline score. A week later, captions on new shows look worse, and nobody is comparing the live error with that offline number. What should the post-release watch do?
• A logistics firm wants to compare a new arrival-time model with the current one on real shipments, with both models seeing the same live traffic mix. Which test does that?
• A media library stores episode filenames that mix a show title, a season-episode code such as S02E07, and a download note. Editors need that code alone in its own column. Which tool pulls the structured code out of the messy filename?
• A bank fraud model trains only while one analyst's notebook session stays open. When that session closes, the job dies and a colleague cannot rerun it the same way. Which change isolates this training code from that session?
• An agency's case labels come from two clerks who often disagree, and the written instruction is vague on borderline files. A model matches one clerk closely. What limits treating those labels as ground truth?
• A logistics carrier still copies a trained routing model onto the scoring server by hand after each experiment. Leadership wants every build, test, and promotion to run the same way, without that manual copy. Which practice matches the request?
• A bank fills every missing applicant income with the mean of the observed incomes before fitting a model of default against income. What side effect should the team expect from that fill?
• A bank compares a champion model with a challenger on a frozen batch of past applications before any promotion. After release, it compares those models on live application decisions. Which statement names the two checks?
• A telecom team can package a scoring service as a container on the current hosts or as a virtual machine. They need the difference in how those two packages handle the kernel. Which statement is correct?
• A media company is training a subtitle model whose weights and batch will not fit on the largest single server it can obtain. The job has to occupy many machines at the same time, not one machine that grows for a while and is later removed. Which deployment matches that limit?
• A logistics company can rent a large pool to train a dock-delay model that will not fit a training run on the gate scanners, but live gate scores must be produced inside the warehouse network, where that rented pool is not allowed to run. Which deployment split fits?
• A factory packages a camera model that scores frames on the line. When one serving copy stops, a replacement should start, and when the line speeds up, more copies should run. Which platform role places those copies, restarts a stopped copy, and scales the count?
• A factory runs a quality model and a maintenance model on one build server. Upgrading a numeric library for the quality model changes results for the maintenance model, which never requested that upgrade. Which practice stops one project's library change from altering the other?
• A telecom billing pipeline reads call records from one store, and scoring stops when that store is down. The team wants another live copy of those same records so the pipeline can keep reading. Which practice supplies that second copy?
• A logistics scoring service must start the same way on a developer laptop, on a staging rack, and on the production floor. Rebuilding it by hand in each place has already produced mismatched libraries. What removes that mismatch?
• A retail chain wants each checkout camera to flag an unscanned item before the shopper steps away. The computer on that camera has little memory, a tight power budget, and only a brief moment to answer. Which constraint should decide how this model is deployed?
• A media company's viewing records must remain inside one country. Its contract forbids copying that store into a foreign region or into a vendor cloud the company does not control. Which deployment keeps the records inside that boundary?
• A logistics firm runs a route planner that is modest on ordinary nights and much larger during the week before a holiday. Hardware that sits idle the rest of the year is wasted spend. Which deployment matches that rise and fall?