memsql使用命令

Question

我有以下查询：

SELECT * FROM scheme.table cont WHERE game_id = 'some-game-id' AND event_arrival_time BETWEEN '2019-12-02 00:00:00' AND '2019-12-31 23:59:59' ORDER BY event_arrival_time

我得到将近30秒的响应时间

对于相同的查询，如果我删除了ORDER BY event_arrival_time，我会在几秒钟内收到响应

这是创建表查询：

CREATE TABLE `cont_event` ( `event_id` varchar(255) CHARACTER SET utf8 COLLATE utf8_general_ci DEFAULT NULL, `action` varchar(20) CHARACTER SET utf8 COLLATE utf8_general_ci DEFAULT NULL, `correlation_id` varchar(255) CHARACTER SET utf8 COLLATE utf8_general_ci DEFAULT NULL, `status` varchar(255) CHARACTER SET utf8 COLLATE utf8_general_ci DEFAULT NULL, `event_arrival_time` datetime DEFAULT NULL, `create_time` timestamp(6) NOT NULL DEFAULT CURRENT_TIMESTAMP, `create_ts` bigint(20) DEFAULT NULL, `operator_id` varchar(255) CHARACTER SET utf8 COLLATE utf8_general_ci DEFAULT NULL, `game_id` varchar(255) CHARACTER SET utf8 COLLATE utf8_general_ci DEFAULT NULL, `player_id` varchar(255) CHARACTER SET utf8 COLLATE utf8_general_ci DEFAULT NULL, `segment_code` varchar(255) CHARACTER SET utf8 COLLATE utf8_general_ci DEFAULT NULL, `bet_amount_original` decimal(15,4) DEFAULT NULL, `bet_amount_converted` decimal(15,4) DEFAULT NULL, `cont_amount_player` decimal(15,4) DEFAULT NULL, `cont_amount_operator` decimal(15,4) DEFAULT NULL, `cont_amount_total` decimal(15,4) DEFAULT NULL, `operator_income` decimal(15,4) DEFAULT NULL, `cont_amount_jackpot` decimal(15,4) DEFAULT NULL, `original_currency` varchar(20) CHARACTER SET utf8 COLLATE utf8_general_ci DEFAULT NULL, `base_currency` varchar(20) CHARACTER SET utf8 COLLATE utf8_general_ci DEFAULT NULL, `currency_rate` decimal(20,6) DEFAULT NULL, `operator_game_code` varchar(255) CHARACTER SET utf8 COLLATE utf8_general_ci DEFAULT NULL, `funnel_id` varchar(255) CHARACTER SET utf8 COLLATE utf8_general_ci DEFAULT NULL, `segment_name` varchar(255) CHARACTER SET utf8 COLLATE utf8_general_ci DEFAULT NULL, `operator_game_name` varchar(255) CHARACTER SET utf8 COLLATE utf8_general_ci DEFAULT NULL, `description` varchar(255) CHARACTER SET utf8 COLLATE utf8_general_ci DEFAULT NULL, `extra_fields` longtext CHARACTER SET utf8 COLLATE utf8_general_ci, `jackpot_game_name` varchar(255) CHARACTER SET utf8 COLLATE utf8_general_ci DEFAULT NULL, `game_version` varchar(16) CHARACTER SET utf8 COLLATE utf8_general_ci DEFAULT NULL, `event_type` varchar(50) CHARACTER SET utf8 COLLATE utf8_general_ci NOT NULL, `event` JSON COLLATE utf8_bin, KEY `operator_id` (`event_arrival_time`,`action`,`operator_id`,`game_id`,`correlation_id`) /*!90619 USING CLUSTERED COLUMNSTORE */ /*!90618 , SHARD KEY () */ ) /*!90621 AUTOSTATS_ENABLED=TRUE */

我在以下位置有索引：event_arrival_time, action, operator_id, game_id, correlation_id

在执行memsql配置文件时，我可以看到过滤器工作正常（请参阅附件）：

我不确定我想念什么吗？有什么优化建议吗？

Answer 1

这是您重复的第一个查询：

SELECT *
FROM scheme.table cont
WHERE
    game_id = 'some-game-id' AND
    event_arrival_time BETWEEN '2019-12-02 00:00:00' AND '2019-12-31 23:59:59'
ORDER BY
    event_arrival_time

您当前定义的索引对我来说似乎是错误的，或者至少是次优的。请尝试以下索引：

CREATE INDEX idx ON cont (event_arrival_time, game_id);

理想情况下，MemSQL能够按照事件到达时间的顺序在您定义的范围内扫描上述索引，并检索所有匹配的记录。