# SyteLine: Transaction Deadlocked, Chosen as the Deadlock Victim

> Source: https://netray.co/erp-help/syteline-sql-deadlock-victim-error-1205
> Publisher: Netray (netray.co), AI and integration engineering for ERP and manufacturing systems.
> Section: ERP Help

## Short answer

SQL Server error 1205 means two sessions each held a lock the other needed, and SQL Server killed one to break the tie. In SyteLine it usually appears during concurrent posting, shipping, MRP or custom code touching the same inventory and ledger rows. Capture the deadlock graph, identify the two statements, and fix the order, the indexes or the isolation level.

## Kind

error

## System

syteline

## Erp

Infor SyteLine (CloudSuite Industrial)

## Module

SQL Server / Database

## Query

SyteLine transaction was deadlocked on lock resources chosen as the deadlock victim

## Alternate Queries

- SQL Server error 1205 SyteLine
- SyteLine deadlock victim rerun the transaction
- CloudSuite Industrial deadlock graph
- SyteLine intermittent deadlock during posting

## Applies To

Infor SyteLine 8.x and CloudSuite Industrial on Microsoft SQL Server (2016 and later; extended events available)

## Steps

### How to diagnose and reduce SyteLine deadlocks

**Items:**

- Record the time, user, form and action when the 1205 error appeared.
- Pull the deadlock report from the system_health extended events session using the query below, matching the timestamp.
- Read the graph: identify the two victim and survivor processes, the resources (key, page, object) and the statements.
- Map the statements to SyteLine: stored procedures such as posting, ship, or inventory routines, or a custom IDO method or event.
- Check for missing or wrong indexes on the locked table; deadlocks on page locks often vanish with a better index.
- If custom code is involved, make it touch tables in the same order as standard code and keep its transactions short.
- Add a limited retry on the application or integration side for the victim transaction.
- Consider read committed snapshot isolation only after testing and a conversation with Infor support.

## Sections

### What actually happens

**Body:**

Deadlock is not slowness and not ordinary blocking. Session A holds a lock on row X and wants Y, session B holds Y and wants X. Neither can proceed, so the SQL Server lock monitor picks the cheaper transaction to roll back and returns error 1205 to that client. The other session continues, which is why the problem looks random: the user whose session was chosen sees the error, and a rerun usually works.

SyteLine makes this likely at certain hotspots because many processes update the same inventory, cost and ledger rows: job material posting, shipping, receiving and background MRP or cost jobs running while users enter transactions. The more concurrent processes, the more chances for two to touch the same rows in opposite order.

### Capture the deadlock graph

**Body:**

SQL Server records deadlocks in the default system_health extended events session, so you can usually read a recent one after the fact. Alternatively enable trace flag 1222 to write graphs to the SQL error log. Capturing the graph is the step that turns a vague complaint into a specific pair of statements.

In the graph look at the resource list first. Key locks on an index of a specific table tell you where the collision is. The input buffer of each process shows the statement or procedure name. Note whether either side comes from a nightly job, an integration account, or a custom report, since those are the easiest to reschedule.

**Code:**

-- Recent deadlock graphs from system_health
SELECT CAST(xed.event_data AS xml) AS deadlock_graph,
       xed.timestamp_utc
FROM (
  SELECT CAST(target_data AS xml) AS td
  FROM sys.dm_xe_session_targets st
  JOIN sys.dm_xe_sessions s ON s.address = st.event_session_address
  WHERE s.name = 'system_health' AND st.target_name = 'ring_buffer'
) t
CROSS APPLY td.nodes('//RingBufferTarget/event[@name="xml_deadlock_report"]') AS q(n)
CROSS APPLY (SELECT q.n.query('.') AS event_data, q.n.value('(@timestamp)[1]','datetime2') AS timestamp_utc) xed
ORDER BY xed.timestamp_utc DESC;

-- Optional: write graphs to the SQL error log (turn off after capture)
DBCC TRACEON (1222, -1);

### Fix options, from safe to invasive

**Body:**

Safest: schedule heavy background jobs away from peak entry, and make custom code short, ordered and indexed. Next, review indexes on the contended tables, but add them through a controlled change because SyteLine upgrades and Infor support may not expect unknown indexes. Document every change.

Most invasive: enabling READ_COMMITTED_SNAPSHOT changes how readers behave and affects tempdb load. It removes many reader-writer deadlocks but not writer-writer ones, and you should confirm support for your version before changing it. Do not enable it on a production database because a forum post suggested it.

## Pitfalls

- Treating a one-off 1205 as a bug when a retry would have succeeded; look for frequency and pattern first.
- Leaving trace flag 1222 on permanently, which bloats the error log.
- Adding indexes blindly to tables you do not own; test and document them.
- Enabling snapshot isolation without checking tempdb sizing and vendor support.
- Blaming SQL Server when the conflicting statement comes from a custom event or integration that holds transactions open.

## Ai Angle

SyteRay can read a deadlock graph and translate it: which two statements collided, which table and index, which form or job probably issued them, and whether a custom IDO or event was involved. It can propose a sequence change or index for review. Applying anything to the database stays with your DBA and a change ticket.

## Faq

### Is a SyteLine deadlock the same as blocking?

**Answer:** No. Blocking means one session waits for another and resolves when the first finishes. A deadlock is a cycle that can never resolve, so SQL Server cancels one transaction with error 1205. Blocking shows as slowness, deadlock shows as a sudden error and a rolled back transaction.

### Is it safe to just rerun the transaction?

**Answer:** Generally yes, since the victim was rolled back completely. Check that the data was not partly saved by custom code that commits outside the transaction. For interfaces, build a bounded retry of two or three attempts with a short delay.

### How often is too often?

**Answer:** A few per month on a busy system can be normal. Several per day, or the same pair of statements every time, indicates a design or scheduling problem worth fixing. Track count and the statement pair rather than relying on user complaints.

### Can I find deadlocks from last week?

**Answer:** Only if they are still in the system_health ring buffer or file target, which rolls over. Set up a dedicated extended events session writing to files with the xml_deadlock_report event if you need history.

## Search terms

syteline deadlock victim, sql server error 1205, syteline transaction deadlocked, cloudsuite industrial deadlock, trace flag 1222 deadlock graph, system_health xml_deadlock_report, syteline sql blocking, read committed snapshot syteline

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