import { DynamoDBClientResolvedConfig, ServiceInputTypes, ServiceOutputTypes } from "../DynamoDBClient";
import { UpdateTimeToLiveInput, UpdateTimeToLiveOutput } from "../models/models_0";
import { Command as $Command } from "@aws-sdk/smithy-client";
import { Handler, MiddlewareStack, HttpHandlerOptions as __HttpHandlerOptions, MetadataBearer as __MetadataBearer } from "@aws-sdk/types";
export declare type UpdateTimeToLiveCommandInput = UpdateTimeToLiveInput;
export declare type UpdateTimeToLiveCommandOutput = UpdateTimeToLiveOutput & __MetadataBearer;
/**
 * <p>The <code>UpdateTimeToLive</code> method enables or disables Time to Live (TTL) for the
 *             specified table. A successful <code>UpdateTimeToLive</code> call returns the current
 *                 <code>TimeToLiveSpecification</code>. It can take up to one hour for the change to
 *             fully process. Any additional <code>UpdateTimeToLive</code> calls for the same table
 *             during this one hour duration result in a <code>ValidationException</code>. </p>
 *          <p>TTL compares the current time in epoch time format to the time stored in the TTL
 *             attribute of an item. If the epoch time value stored in the attribute is less than the
 *             current time, the item is marked as expired and subsequently deleted.</p>
 *         <note>
 *             <p> The epoch time format is the number of seconds elapsed since 12:00:00 AM January 1,
 *                 1970 UTC. </p>
 *         </note>
 *         <p>DynamoDB deletes expired items on a best-effort basis to ensure availability of
 *             throughput for other data operations.
 *         </p>
 *             <important>
 *                 <p>DynamoDB typically deletes expired items within two days of expiration. The exact duration
 *                 within which an item gets deleted after expiration is specific to the
 *                 nature of the workload. Items that have expired and not been deleted will still show up in reads,
 *                     queries, and scans.</p>
 *             </important>
 *         <p>As items are deleted, they are removed from any local secondary index and global
 *             secondary index immediately in the same eventually consistent way as a standard delete
 *             operation.</p>
 *         <p>For more information, see <a href="https://docs.aws.amazon.com/amazondynamodb/latest/developerguide/TTL.html">Time To Live</a> in the Amazon DynamoDB Developer Guide. </p>
 */
export declare class UpdateTimeToLiveCommand extends $Command<UpdateTimeToLiveCommandInput, UpdateTimeToLiveCommandOutput, DynamoDBClientResolvedConfig> {
    readonly input: UpdateTimeToLiveCommandInput;
    constructor(input: UpdateTimeToLiveCommandInput);
    /**
     * @internal
     */
    resolveMiddleware(clientStack: MiddlewareStack<ServiceInputTypes, ServiceOutputTypes>, configuration: DynamoDBClientResolvedConfig, options?: __HttpHandlerOptions): Handler<UpdateTimeToLiveCommandInput, UpdateTimeToLiveCommandOutput>;
    private serialize;
    private deserialize;
}