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Solana does not put an application’s mutable state inside its program code. Programs are executable code; the state they work with lives in separate accounts, which are passed to programs through instructions. That separation is the key to understanding how Solana’s account model works—and why it can feel different from a traditional web app backed by a database.
How does Solana’s account model work?
Every account is identified by a 32-byte address and has a common structure: a lamport balance, a byte array of data, an owner program ID, an executable flag, and a rent_epoch field that is now deprecated. Accounts are the shared containers programs use for both program code and application state. See Solana’s Account Structure documentation.
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A program is not a conventional server that privately owns its database. It receives account references in an instruction and operates on accounts it is allowed to access. Solana’s Core Concepts documentation puts the distinction directly: “Programs are stateless and all mutable state lives in separate data accounts passed via instructions.”
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The executable flag distinguishes program accounts from ordinary data accounts. Program accounts represent executable programs; data accounts hold state that programs read or update. For upgradeable deployments, executable bytes may be stored in a separate ProgramData account, so it is not safe to assume that every executable account contains the program’s code directly. Solana explains these account roles in its Account Types documentation.
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“Program = web server; data accounts = database” can help as a first analogy: one side supplies logic, while the other holds state. But it is only an analogy. Solana programs are not conventional web servers, and accounts are not relational tables or rows with a database engine behind them.
How does the owner field control account changes?
The owner field is a program ID, not the identity of a wallet holder. It marks which program has authority to change an account’s data or debit its lamports. The owner program is the only program that can:
- Modify the account’s data.
- Deduct lamports from the account.
Other runtime rules matter too: an instruction must receive an account as writable to change it, while a read-only account cannot be modified. A program may credit lamports to a writable account even when it does not own that account. These distinctions are described in Solana’s Modification Rules documentation.
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Why does this feel different from a conventional database?
In a typical Web2 application, a backend service usually talks to a database whose tables, rows, and access rules are managed through that application’s infrastructure. Solana separates executable logic from mutable state, and the runtime enforces account ownership and instruction-level access rules.
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| Concept | Conventional Web2 application | Solana |
|---|---|---|
| Application logic | Backend code runs as a service. | Programs are executable code deployed on-chain. |
| Mutable state | Stored in a backing database, often organized into tables and rows. | Stored in separate data accounts as bytes; instructions pass accounts to programs. |
| Write authority | Typically governed by application and database permissions. | Governed by account ownership, writable access, and runtime rules. |
The comparison is about architecture, not identical behavior. Solana’s accounts are addressable state containers with program-defined data formats; they do not automatically provide the tables, queries, or schema management associated with a relational database.
What does this mean when reading account data?
An account’s data is a byte array, not inherently a human-readable record. The program that owns the account defines how those bytes should be interpreted. To make sense of account state, a client may need to fetch the bytes and deserialize them according to that program’s format. The owner tells you which program governs writes; it does not, by itself, explain the data layout.
Does Solana still charge recurring rent for accounts?
Accounts require a minimum lamport balance proportional to their data size to keep data stored on-chain. Solana’s account documentation describes this as a refundable storage balance and says ongoing rent collection is disabled. The deprecated rent_epoch field should therefore not be read as a schedule for an active recurring charge. The same documentation lists a maximum account data size of 10 MiB and defines 1 SOL as 1,000,000,000 lamports; these are protocol details, not market statistics.
Why this model changes the mental picture
Thinking in terms of accounts replaces the simple “backend plus database” picture with three questions: which program owns this account, what format do its bytes use, and which instructions are allowed to access or change it? Once those are clear, the separation between executable logic and mutable state is easier to follow.
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