Ssis-948 May 2026
Jenna remembered that the package contained a Derived Column transformation that calculated a “CorrectedOrderDate”:
CorrectedOrderDate = ISNULL(OrderDate, DATEADD(DAY, -1, ShipDate))
The logic was meant to back‑fill missing dates with the previous day’s ship date. The derived column was then mapped to the destination column OrderDate.
She opened the data viewer on the Data Flow, set a breakpoint after the Derived Column, and ran the package in debug mode. As rows streamed by, everything looked perfect—CorrectedOrderDate always held a value.
But then, a breakpoint hit on row # 5,932. The viewer showed:
| OrderID | CustomerID | OrderDate | ShipDate | TotalAmount | CorrectedOrderDate | |---------|------------|-----------|------------|-------------|--------------------| | 457812 | 1023 | NULL | 2026‑04‑15 | 1250.00 | NULL | ssis-948
The derived column had failed to compute a value! The ShipDate for that row was also NULL (a rare but possible scenario when an order was still being processed). The expression ISNULL(OrderDate, DATEADD(DAY, -1, ShipDate)) returned NULL because both arguments were NULL.
That was the culprit. The package’s defensive logic was incomplete.
The director employs a mix of locked-off tripod shots for dialogue and intimate handheld for moments of psychological breach. There is a notable lack of unnecessary movement; every pan and zoom is motivated by character action.
| Property | Default | Typical Use‑Case |
|----------|---------|-------------------|
| ChunkSize | 0 (auto‑tune) | Set a fixed size for deterministic load patterns (e.g., when you have a known index rebuild window). |
| MaxParallelism | 0 (uses MAXDOP from the destination DB) | Limit parallel writers on a constrained VM or when the destination is a cloud database with throttling limits. |
| TransactionMode | ChunkCommit | Switch to AllOrNone for critical master‑data loads, or Savepoint for “resume‑on‑failure”. |
| ErrorOutputMode | RedirectRow | Choose FailComponent if you want the package to stop on any validation failure, or RedirectRow for a “clean‑room” load. |
| NetworkLatencyThresholdMs | 30 ms | Lower this value when you have a high‑speed intra‑datacenter link; raise it for cross‑region copies to let the engine fall back to bulk‑copy. |
| EnableTelemetry | True | Turn off only for ultra‑high‑throughput scenarios where logging overhead becomes measurable. | Jenna remembered that the package contained a Derived
SSIS‑948 is a major runtime enhancement that introduces Adaptive Buffer Management (ABM) to the SSIS data‑flow engine. By dynamically adjusting buffer size, row count, and memory allocation at runtime, ABM eliminates the “one‑size‑fits‑all” limitation of the traditional static buffer model. The result is:
| Metric (Typical Large‑Scale Load) | Before SSIS‑948 | After SSIS‑948 | |-----------------------------------|----------------|----------------| | Throughput | 250 k rows/s | 425 k rows/s (+70 %) | | CPU Utilisation | 85 % avg | 62 % avg (‑23 %) | | Memory Footprint | 2 GB (peak) | 1.3 GB (‑35 %) | | Error‑rate (buffer‑related) | 3 % of runs | <0.2 % (‑93 %) |
ABM is transparent to package authors – the existing data‑flow components continue to work unchanged. However, developers can optionally tune the adaptive algorithm through a new set of properties on the Data Flow Task.
| Symptom | Root Cause | Remedy |
|---------|------------|--------|
| Load stalls at ~70 % | Destination log file is filling up because the recovery model is FULL and log backups are not occurring during the run. | Switch the target to BULK_LOGGED for the duration of the load or schedule a log‑backup every 10 min. |
| “Deadlock victim” errors | Parallel writers are contending on a non‑clustered index that is being updated for each row. | Add a filtered index that excludes the load column, or temporarily drop the index and rebuild after the load. |
| “Invalid column name” | Mismatch between source metadata and the destination table schema (e.g., a newly added column). | Refresh the Data Flow metadata or use the ValidateExternalMetadata = False property and map columns manually. |
| Chunk size never grows | Destination table has a high page split rate; the engine keeps shrinking chunks to avoid log growth. | Re‑organize/re‑build the table’s clustered index before the load, or set a fixed ChunkSize if you know the optimal batch. |
| High CPU usage on the SSIS host | MaxParallelism is set higher than the physical cores, causing context‑switch thrashing. | Set MaxParallelism ≤ Number of logical CPUs. | The logic was meant to back‑fill missing dates
| Context | What to Check | |---------|---------------| | SQL Agent Job | Job step runs under a proxy account – does the proxy have the required permissions? | | SSIS Catalog (SSISDB) | Package executed with a specific Execution Credential – verify it matches the connection manager’s authentication. | | Windows Service | If using DTExec.exe from a service, make sure the service account can access the data source. |
The sun had barely risen over the glass‑capped headquarters of Apex Analytics, a boutique firm that helped Fortune‑500 companies turn raw data into actionable insight. Inside, the hum of servers and the occasional clack of keyboard keys formed the soundtrack of a typical Monday.
Jenna Ortega, the senior ETL architect, was sipping her third coffee of the week when a red flag appeared on her screen:
[ERROR] Package: DailySalesLoad.dtsx
Task: OLE DB Destination – dbo.FactSales
Error: SSIS‑948 – “Row failed validation: Destination column 'OrderDate' cannot be NULL.”
The SSIS‑948 error code was notorious in the team’s lore—a cryptic, intermittent fault that had haunted the “Daily Sales Load” package for months. It usually manifested only during the early hours of the morning, when the data volume spiked and the source system was still catching up from the previous night’s batch.
Jenna’s heart rate quickened. The daily load fed the Executive Dashboard, and any hiccup meant that the C‑suite would see stale numbers for the day. She knew the stakes.