> ## Documentation Index
> Fetch the complete documentation index at: https://private-7c7dfe99-parallel-read-in-order-multi-part.mintlify.site/llms.txt
> Use this file to discover all available pages before exploring further.

> Tabla del sistema útil para expertos en C++ e ingenieros de ClickHouse, que contiene información de introspección sobre el binario `clickhouse`.

# system.symbols

## Descripción

Contiene información para la introspección del binario `clickhouse`. Para acceder a ella, se requiere el privilegio de introspección.
Esta tabla solo es útil para expertos en C++ y los ingenieros de ClickHouse.

## Columnas

* `symbol` ([String](/es/reference/data-types/string)) — Nombre del símbolo en el binario. Está decorado. Puede aplicar demangle(symbol) para obtener un nombre legible.
* `symbol_demangled` ([Nullable(String)](/es/reference/data-types/nullable)) — Símbolo sin decorar utilizado para la instrumentación de XRay.
* `function_id` ([Nullable(Int32)](/es/reference/data-types/nullable)) — ID de la función en el mapa de instrumentación de XRay.
* `address_begin` ([UInt64](/es/reference/data-types/int-uint)) — Dirección inicial del símbolo en el binario.
* `address_end` ([UInt64](/es/reference/data-types/int-uint)) — Dirección final del símbolo en el binario.

## Ejemplo

```sql theme={null}
SELECT
    symbol,
    demangle(symbol) AS symbol_demangled,
    address_begin,
    address_end
FROM system.symbols
LIMIT 5
SETTINGS allow_introspection_functions = 1;
```

```text theme={null}
Row 1:
──────
symbol:           _Z15isClickHouseAppNSt3__117basic_string_viewIcNS_11char_traitsIcEEEERNS_6vectorIPcNS_9allocatorIS5_EEEE
symbol_demangled: isClickHouseApp(std::__1::basic_string_view<char, std::__1::char_traits<char>>, std::__1::vector<char*, std::__1::allocator<char*>>&)
address_begin:    219229312 -- 219.23 million
address_end:      219231408 -- 219.23 million

Row 2:
──────
symbol:           main
symbol_demangled: main
address_begin:    219231872 -- 219.23 million
address_end:      219233485 -- 219.23 million

Row 3:
──────
symbol:           _ZN12_GLOBAL__N_19printHelpEiPPc
symbol_demangled: (anonymous namespace)::printHelp(int, char**)
address_begin:    219233536 -- 219.23 million
address_end:      219233902 -- 219.23 million

Row 4:
──────
symbol:           _ZNSt3__110filesystem4pathC2B8se210105IPcvEERKT_NS1_6formatE
symbol_demangled: std::__1::filesystem::path::path[abi:se210105]<char*, void>(char* const&, std::__1::filesystem::path::format)
address_begin:    219234496 -- 219.23 million
address_end:      219234620 -- 219.23 million

Row 5:
──────
symbol:           _ZNSt3__113unordered_setINS_17basic_string_viewIcNS_11char_traitsIcEEEENS_4hashIS4_EENS_8equal_toIS4_EENS_9allocatorIS4_EEEC2ESt16initializer_listIS4_E
symbol_demangled: std::__1::unordered_set<std::__1::basic_string_view<char, std::__1::char_traits<char>>, std::__1::hash<std::__1::basic_string_view<char, std::__1::char_traits<char>>>, std::__1::equal_to<std::__1::basic_string_view<char, std::__1::char_traits<char>>>, std::__1::allocator<std::__1::basic_string_view<char, std::__1::char_traits<char>>>>::unordered_set(std::initializer_list<std::__1::basic_string_view<char, std::__1::char_traits<char>>>)
address_begin:    219235584 -- 219.24 million
address_end:      219235708 -- 219.24 million
```