21.11.3.6
```
cat /etc/clickhouse-server/node.tsv
1,test

cat /etc/clickhouse-server/node_dictionary.xml
<dictionaries>
    <dictionary>
        <name>node</name>
        <source>
            <file>
                <path>/etc/clickhouse-server/node.tsv</path>
                <format>CSV</format>
            </file>
        </source>
        <lifetime>0</lifetime>
        <layout><flat /></layout>
        <structure>
            <id><name>key</name></id>
            <attribute>
                <name>name</name>
                <type>String</type>
                <null_value></null_value>
            </attribute>
        </structure>
    </dictionary>
</dictionaries>

create table default.node ( key UInt64, name String ) Engine=Dictionary(node);

select * from default.node;
┌─key─┬─name─┐
│   1 │ test │
└─────┴──────┘

/etc/init.d/clickhouse-server restart

<Error> Application: DB::Exception: Cannot attach 1 tables due to cyclic dependencies. See server log for details.
<Information> Application: shutting down
```
{
    if (auto table = tryGetTable(table_name, getContext()))
        return table->getStorageID().uuid;
    return UUIDHelpers::Nil;
}
void DatabaseMemory::drop(ContextPtr local_context)
{
    
    std::filesystem::remove_all(local_context->getPath() + data_path);
}
void DatabaseMemory::alterTable(ContextPtr local_context, const StorageID & table_id, const StorageInMemoryMetadata & metadata)
{
    std::lock_guard lock{mutex};
    auto it = create_queries.find(table_id.table_name);
    if (it == create_queries.end() || !it->second)
        throw Exception(ErrorCodes::UNKNOWN_TABLE, "Cannot alter: There is no metadata of table {}", table_id.getNameForLogs());
    applyMetadataChangesToCreateQuery(it->second, metadata);
    TableNamesSet new_dependencies = getDependenciesSetFromCreateQuery(local_context->getGlobalContext(), it->second);
    DatabaseCatalog::instance().updateLoadingDependencies(table_id, std::move(new_dependencies));
}
}