SyteLine Memory Issues: Leaks, High Usage, and Fixes
Memory issues in SyteLine range from gradual performance degradation caused by memory leaks to sudden application crashes with "System.OutOfMemoryException" errors. These problems are amplified in CloudSuite Industrial environments where the web-based client shares IIS resources with IDO processing, report generation, and ION integration services. Identifying whether the memory issue originates in the application tier, the IDO runtime, or the SQL Server layer is the critical first diagnostic step.
Diagnosing Memory Leaks in SyteLine Application Server
A memory leak in SyteLine presents as steadily increasing memory consumption in the IIS worker process (w3wp.exe) that never reclaims memory even when user sessions end. The process grows from its baseline 500MB to 2GB, 4GB, or until the server runs out of physical memory and the app pool recycles with the error "A worker process serving application pool 'SyteLineAppPool' was terminated due to memory limits." Use Process Monitor and .NET memory profiling to isolate the leak.
- Monitor the SyteLine app pool's Private Bytes and .NET CLR Memory Gen 2 Heap Size counters in Performance Monitor—a healthy pattern shows periodic Gen 2 collections that reclaim memory; a leak shows Gen 2 Heap growing monotonically
- Take a memory dump of w3wp.exe when memory exceeds 2GB using procdump: procdump -ma -m 2048 w3wp.exe C:\Dumps\SL_MemDump.dmp — then analyze with WinDbg or dotMemory to identify which managed objects are accumulating
- Common leak source: custom IDO extensions that instantiate DataTable or DataSet objects in LoadCollection handlers without calling Dispose()—each uncollected DataTable retains the full result set in memory across the session lifetime
- Check for event handler leaks: custom form event handlers that subscribe to .NET events (+=) without unsubscribing (-=) prevent garbage collection of the entire form object graph
- Configure IIS app pool recycling as a temporary mitigation: set Private Memory Limit to 4GB and Regular Time Interval to 1440 minutes (24 hours) in IIS Manager > Application Pools > SyteLineAppPool > Advanced Settings > Recycling
SQL Server Memory Pressure from SyteLine Queries
SyteLine's SQL Server instance can consume all available server memory because SQL Server is designed to cache data pages aggressively. The problem surfaces when SyteLine queries generate massive execution plans that fill the plan cache, or when missing indexes cause full table scans that load entire tables into the buffer pool. The error "There is insufficient system memory in resource pool 'default' to run this query" indicates SQL Server has exhausted its allocated memory and cannot allocate workspace for a new query.
- Error: "Insufficient system memory in resource pool" — set SQL Server Max Server Memory to 70-80% of physical RAM, leaving at least 4GB for the OS and IIS: EXEC sp_configure 'max server memory', 12288 (for a 16GB server)
- Query the plan cache bloat: SELECT objtype, COUNT(*) as plan_count, SUM(size_in_bytes)/1048576 as size_mb FROM sys.dm_exec_cached_plans GROUP BY objtype — if 'Adhoc' plans exceed 1GB, enable 'Optimize for Ad Hoc Workloads' server option
- Identify memory-hungry queries: SELECT TOP 10 qs.total_grant_kb, st.text FROM sys.dm_exec_query_stats qs CROSS APPLY sys.dm_exec_sql_text(qs.sql_handle) st ORDER BY qs.total_grant_kb DESC — these are your optimization targets
- For SyteLine databases exceeding 50GB, implement Resource Governor to create separate resource pools for interactive users (60% memory) and background tasks like MRP (40% memory) to prevent MRP from starving user queries
OutOfMemoryException in SyteLine Client and Middleware
The SyteLine web client throws OutOfMemoryException in the browser when a form attempts to load an extremely large grid result set (50,000+ rows) or when multiple browser tabs each hold large datasets. The SyteLine middleware (IDO Runtime) throws OutOfMemoryException when a single IDO request returns a dataset exceeding 500MB, typically from an unfiltered LoadCollection on a large transaction table. Both scenarios require configuration limits and query optimization.
- Client-side OutOfMemory — implement server-side paging on all grid forms that access transaction tables: set the form's RecordCap to 500 in Form Designer, and add a filter panel that requires users to specify date range or status filters before loading
- IDO Runtime OutOfMemory — add the MaxRows property to IDO definitions for transaction IDOs: open IDO Metadata > Properties > set MaxRows=10000 to prevent unbounded LoadCollection calls from consuming unlimited memory
- Report generation OutOfMemory — for large SSRS reports, enable report streaming by setting the SSRS execution timeout and adding pagination to the report dataset query using OFFSET/FETCH instead of loading all rows into a single dataset
- If the SyteLine middleware runs in 32-bit mode (rare in modern installs), it is limited to 2GB address space—verify the IIS app pool's Enable 32-Bit Applications is set to False in Advanced Settings
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