Delphi E2089: Type Size Too Large — What It Means & How to Fix It

What Does This Error Mean?

E2089 means you declared a record, array, or structure that is too large for the platform you are compiling for. On 32-bit platforms the maximum size for a single data type is 2 GB. On some older 16-bit contexts the limit is much smaller. Fix it by splitting the data into smaller pieces, using dynamic arrays, or allocating memory with New or GetMem.

Affected Models

Delphi 10.4 Sydney
Delphi 11 Alexandria
Delphi 12 Athens
Embarcadero RAD Studio
Free Pascal / Lazarus

Common Causes

Declaring a static array with millions of elements as a local variable or record field
Nesting very large records inside other records multiple levels deep
Declaring a static array of large records that together exceed the platform limit
Migrating 64-bit assumptions to a 32-bit compilation target
An array dimensioned by a large constant that was intended for a different purpose

How to Fix It

Calculate the actual size of your type: multiply the element count by the element size in bytes.

Example: array[1..1000000] of Double = 1,000,000 * 8 bytes = 8 MB — this is fine. array[1..1000000000] of Double = 8 GB — too large.
Replace the static array declaration with a dynamic array: change 'array[0..N] of T' to 'array of T' and allocate it at runtime with SetLength.

Dynamic arrays are heap-allocated and not limited by the static type size restrictions.
If the data is in a record, consider splitting it into multiple smaller records or replacing fixed-size fields with dynamic arrays or pointers.

A record with a dynamic array field stores a pointer (4 or 8 bytes) in the record — the actual data lives on the heap.
For very large memory allocations, use GetMem or AllocMem and manage the memory manually with FreeMem.

This gives you full control over allocation size but requires careful cleanup to avoid memory leaks.
If you are compiling for 32-bit and need large data, consider switching to 64-bit compilation target where available.

64-bit Delphi applications have a much larger address space, removing many of the size limitations.

When to Call a Professional

This is a compiler error — no professional repair needed. Fix it by reading the error message and correcting the code. The Delphi IDE highlights the exact line causing the problem.

Frequently Asked Questions

What is the maximum size of a record or array in Delphi?

On 32-bit Windows targets the maximum size of a single data type is 2 GB (2,147,483,647 bytes). On 64-bit targets the limit is much larger, though practical limits are set by available RAM. Static arrays declared as local variables are also limited by the stack size — use heap allocation for large data.

What is the difference between a static and a dynamic array in Delphi?

A static array has its size fixed at compile time: array[1..100] of Integer — always exactly 100 elements, allocated on the stack or in the record. A dynamic array has its size set at runtime: array of Integer — you call SetLength to size it and it lives on the heap. Dynamic arrays are the right choice when the size is large or not known at compile time.

Can large local variables cause a stack overflow even without E2089?

Yes — even if a static array is small enough not to trigger E2089, declaring it as a local variable (inside a procedure) puts it on the call stack. If enough stack space is not available, you get a stack overflow at runtime. For large arrays, always use dynamic allocation (dynamic arrays, GetMem, or TList/TObjectList) even if the size passes the E2089 check.