Center

Tools¶

The Center has several tools to aid developers as they build tables, indexes, triggers, timers, procedures, and methods. These tools are:

SHOW, returns information on a group of objects e.g. SHOW TABLES
DESCRIBE, returns the definition of a given object
DIAGNOSE, returns the memory usage of a given table
DISABLE and ENABLE, tools for turning timers & triggers on/off
SETLOCAL, setting local variables for a given session e.g. returned table limits

SHOW¶

Overview

Provides a table listing all records and relevant Metadata of a particular type with optional filtering and sorting. Note, for tables, only PUBLIC tables are listed.

SHOW object_type [WHERE where_expr ] [ORDER BY expr [ASC|DESC] [, expr [ASC|DESC] ...]]

object_type can be any of TABLES, COLUMNS, COMMANDS, DATASOURCES, DATASOURCE_TYPES, PROCEDURES, PROPERTIES, RESOURCES, TRIGGERS, TIMERS, CONNECTIONS, RELAYS, PLUGINS, SESSIONS, VARS, PROCESSES, METHODS

Example

This example will return all tables whose name contains "data" and will order the results by the number of columns in the table.

SHOW TABLES WHERE TableName =~ "data" ORDER BY ColumnsCount

SHOW TABLE¶

Overview

Provides a table listing all columns and relevant Metadata of a particular table with optional filtering and sorting.

SHOW TABLE table_expr  [WHERE where_expr ] [ORDER BY expr [ASC|DESC] [, expr [ASC|DESC]  ...]]

Example

This example will return all columns for the myorders table, alphabetized by name.

SHOW TABLE myorders order by ColumnName

DESCRIBE¶

Overview

Provides a table containing with an "SQL" column containing the statement(s) necessary to reconstruct the supplied table, trigger, timer, procedure, or index.

DESCRIBE TABLE table_name
DESCRIBE TRIGGER trigger_name
DESCRIBE TIMER timer_name
DESCRIBE PROCEDURE procedure_name
DESCRIBE INDEX index_name ON table_name

Example

This example will return the create statement that can be used to create the __COLUMN table and its pk index.

DESCRIBE TABLE __COLUMN;

DIAGNOSE¶

Overview

Returns a table providing details on the approximate memory footprint of tables, columns and indexes.

DIAGNOSE TABLE table_name [,table_name ...]
DIAGNOSE COLUMN column_name on table_name [,column_name on table_name ...]
DIAGNOSE INDEX index_name ON table_name [,index_name on table_name ...]

Examples

This example will return the memory used by the __COLUMN table

DIAGNOSE TABLE __COLUMN;

DISABLE and ENABLE¶

Overview

Used to disable/enable triggers and timers by name. Disabled triggers and timers will not get executed when they otherwise would. By default, when triggers and timers are created they are enabled. Check the enabled/disabled status using SHOW TRIGGERS and SHOW TIMERS.

DISABLE TRIGGER trigger_name
ENABLE TRIGGER trigger_name

DISABLE TIMER trigger_name
ENABLE TIMER trigger_name

Examples

This example will disable the trigger named my_trigger and enable the timer my_timer:

DISABLE TRIGGER my_trigger;
ENABLE TIMER my_timer;

SETLOCAL¶

Overview

Controls local variables for the command line session. These local variables dictate behavior of the command line interface. Run SETLOCAL to see the list of variables that can be changed. Note, this command cannot be run from the AMIDB Shell Tool.

SETLOCAL varname = value

Variables

Variables	Description
`limit`	The default limit to apply to queries (similar to the limit field in the datamodel), `-1` means no default limit
`max_print_chars`	Total number of characters to print to the console for a query result. This prevents from very large query results overwhelming terminal
`multiline`	If set to `"off"` then pressing enter will automatically execute the user entered. If set to `"on"` then pressing enter will progress to a new line for additional input. Pressing enter twice in succession will execute the users entered text.
`show_plan`	If set to `"off"` the engine will not show the query plan, this is more efficient as some overhead is necessary to gather and display this importation. If set to `"on"` then the engine will produce verbose output on the steps and time taking for each step in the query. This can be useful for optimizing your queries.
`timeout`	Amount of time in milliseconds that the console will hang waiting for a response. It must be a positive number
`unprintable_chars`	Determines how to print unprintable ASCII characters, for example 0x01 (SOH). If set to `"marker"` then an upside down question mark (¿) is printed in place of any unprintable chars (default). If set to `"show"` the raw, unprintable, is sent to stdout. If set to `"hide"` then nothing is printed. If set to `"show_code"` then an upside down question mark (¿) is printed followed by the chars 4 digit hexcode is printed. For example, the SOH would be printed as: ¿0001
`datetime_format`	The format to use when printing UTC and UTCN columns. If set to empty string, the Raw long value (unix epoch) is printed. The default is `"YYYY-MM-DD HH:mm:ss.SSS.z"`
`timezone`	Works in conjunction with datetime_format, to determine local time for display. For example EST5EDT would be used for New York. Default is UTC
`string_template`	Should commands interpret string templates (default is off). If set to `"on"` then `${...}` will be evaluated and replaced with the contents. If set to `"off"` then `${...}` will be treated as a literal.
`password_encrypt`	Should commands interpret string templates (default is off).If set to `"on"` then login command should be supplied with an encrypted password. The password will be decrypted using the key stored on the AMI server. Note, use `strEncrypt(...)` method to get the encrypted version of a plain text password. Ex: `select strEncrypt("demopass");`. If set to `"off"` then login command should be supplied with plain text password.

Example

setlocal timeout=30000