improve document

Author: platinumhamburg

website/docs/engine-flink/ddl.md website/docs/engine-flink/ddl/index.mdwebsite/docs/engine-flink/ddl.md renamed to website/docs/engine-flink/ddl/index.md

@@ -406,252 +406,3 @@ WITH (
 - Only continuous refresh mode is supported
 - Schema is automatically derived from the query
 - Materialized tables are stored as regular Fluss tables with special metadata
-
-## Procedures
-
-Fluss provides stored procedures to perform administrative and management operations through Flink SQL. All procedures are located in the `sys` namespace and can be invoked using the `CALL` statement.
-
-### Available Procedures
-
-You can list all available procedures using:
-
-```sql title="Flink SQL"
-SHOW PROCEDURES;
-```
-
-### Access Control Procedures
-
-Fluss provides procedures to manage Access Control Lists (ACLs) for security and authorization.
-
-#### add_acl
-
-Add an ACL entry to grant permissions to a principal.
-
-**Syntax:**
-
-```sql
-CALL [catalog_name.]sys.add_acl(
-  resource => 'STRING',
-  permission => 'STRING', 
-  principal => 'STRING',
-  operation => 'STRING',
-  host => 'STRING'  -- optional, defaults to '*'
-)
-```
-
-**Parameters:**
-
-- `resource` (required): The resource to grant permissions on. Can be `'CLUSTER'` for cluster-level permissions or a specific resource name (e.g., database or table name).
-- `permission` (required): The permission type to grant. Valid values are `'ALLOW'` or `'DENY'`.
-- `principal` (required): The principal to grant permissions to, in the format `'Type:Name'` (e.g., `'User:Alice'`).
-- `operation` (required): The operation type to grant. Valid values include `'READ'`, `'WRITE'`, `'CREATE'`, `'DELETE'`, `'ALTER'`, `'DESCRIBE'`, `'CLUSTER_ACTION'`, `'IDEMPOTENT_WRITE'`.
-- `host` (optional): The host from which the principal can access the resource. Defaults to `'*'` (all hosts).
-
-**Example:**
-
-```sql title="Flink SQL"
--- Use the Fluss catalog (replace 'fluss_catalog' with your catalog name if different)
-USE fluss_catalog;
-
--- Grant read permission to user Alice from any host
-CALL sys.add_acl(
-  resource => 'CLUSTER',
-  permission => 'ALLOW',
-  principal => 'User:Alice',
-  operation => 'READ',
-  host => '*'
-);
-
--- Grant write permission to user Bob from a specific host
-CALL sys.add_acl(
-  resource => 'my_database.my_table',
-  permission => 'ALLOW',
-  principal => 'User:Bob',
-  operation => 'WRITE',
-  host => '192.168.1.100'
-);
-```
-
-#### drop_acl
-
-Remove an ACL entry to revoke permissions.
-
-**Syntax:**
-
-```sql
-CALL [catalog_name.]sys.drop_acl(
-  resource => 'STRING',
-  permission => 'STRING',
-  principal => 'STRING', 
-  operation => 'STRING',
-  host => 'STRING'  -- optional, defaults to '*'
-)
-```
-
-**Parameters:**
-
-All parameters accept the same values as `add_acl`. You can use `'ANY'` as a wildcard value to match multiple entries for batch deletion.
-
-**Example:**
-
-```sql title="Flink SQL"
--- Use the Fluss catalog (replace 'fluss_catalog' with your catalog name if different)
-USE fluss_catalog;
-
--- Remove a specific ACL entry
-CALL sys.drop_acl(
-  resource => 'CLUSTER',
-  permission => 'ALLOW',
-  principal => 'User:Alice',
-  operation => 'READ',
-  host => '*'
-);
-
--- Remove all ACL entries for a specific user
-CALL sys.drop_acl(
-  resource => 'ANY',
-  permission => 'ANY',
-  principal => 'User:Alice',
-  operation => 'ANY',
-  host => 'ANY'
-);
-```
-
-#### list_acl
-
-List ACL entries matching the specified filters.
-
-**Syntax:**
-
-```sql
-CALL [catalog_name.]sys.list_acl(
-  resource => 'STRING',
-  permission => 'STRING',  -- optional, defaults to 'ANY'
-  principal => 'STRING',   -- optional, defaults to 'ANY'
-  operation => 'STRING',   -- optional, defaults to 'ANY'
-  host => 'STRING'         -- optional, defaults to 'ANY'
-)
-```
-
-**Parameters:**
-
-All parameters accept the same values as `add_acl`. Use `'ANY'` as a wildcard to match all values for that parameter.
-
-**Returns:** An array of strings, each representing an ACL entry in the format: `resource="...";permission="...";principal="...";operation="...";host="..."`
-
-**Example:**
-
-```sql title="Flink SQL"
--- Use the Fluss catalog (replace 'fluss_catalog' with your catalog name if different)
-USE fluss_catalog;
-
--- List all ACL entries
-CALL sys.list_acl(resource => 'ANY');
-
--- List all ACL entries for a specific user
-CALL sys.list_acl(
-  resource => 'ANY',
-  principal => 'User:Alice'
-);
-
--- List all read permissions
-CALL sys.list_acl(
-  resource => 'ANY',
-  operation => 'READ'
-);
-```
-
-### Cluster Configuration Procedures
-
-Fluss provides procedures to dynamically manage cluster configurations without requiring a server restart.
-
-#### get_cluster_config
-
-Retrieve cluster configuration values.
-
-**Syntax:**
-
-```sql
--- Get a specific configuration
-CALL [catalog_name.]sys.get_cluster_config(config_key => 'STRING')
-
--- Get all cluster configurations
-CALL [catalog_name.]sys.get_cluster_config()
-```
-
-**Parameters:**
-
-- `config_key` (optional): The configuration key to retrieve. If omitted, returns all cluster configurations.
-
-**Returns:** A table with columns:
-- `config_key`: The configuration key name
-- `config_value`: The current value
-- `config_source`: The source of the configuration (e.g., `DYNAMIC_CONFIG`, `STATIC_CONFIG`)
-
-**Example:**
-
-```sql title="Flink SQL"
--- Use the Fluss catalog (replace 'fluss_catalog' with your catalog name if different)
-USE fluss_catalog;
-
--- Get a specific configuration
-CALL sys.get_cluster_config(
-  config_key => 'kv.rocksdb.shared-rate-limiter.bytes-per-sec'
-);
-
--- Get all cluster configurations
-CALL sys.get_cluster_config();
-```
-
-#### set_cluster_config
-
-Set or delete a cluster configuration dynamically.
-
-**Syntax:**
-
-```sql
--- Set a configuration value
-CALL [catalog_name.]sys.set_cluster_config(
-  config_key => 'STRING',
-  config_value => 'STRING'
-)
-
--- Delete a configuration (reset to default)
-CALL [catalog_name.]sys.set_cluster_config(config_key => 'STRING')
-```
-
-**Parameters:**
-
-- `config_key` (required): The configuration key to modify.
-- `config_value` (optional): The new value to set. If omitted or empty, the configuration is deleted (reset to default).
-
-**Important Notes:**
-
-- Changes are validated before being applied and persisted in ZooKeeper
-- Changes are automatically applied to all servers (Coordinator and TabletServers)
-- Changes survive server restarts
-- Not all configurations support dynamic changes. The server will reject invalid modifications
-
-**Example:**
-
-```sql title="Flink SQL"
--- Use the Fluss catalog (replace 'fluss_catalog' with your catalog name if different)
-USE fluss_catalog;
-
--- Set RocksDB rate limiter
-CALL sys.set_cluster_config(
-  config_key => 'kv.rocksdb.shared-rate-limiter.bytes-per-sec',
-  config_value => '200MB'
-);
-
--- Set datalake format
-CALL sys.set_cluster_config(
-  config_key => 'datalake.format',
-  config_value => 'paimon'
-);
-
--- Delete a configuration (reset to default)
-CALL sys.set_cluster_config(
-  config_key => 'kv.rocksdb.shared-rate-limiter.bytes-per-sec'
-);
-```