total_keys扫描key多

weibiao
Wed, 14 Sep 2022 13:31:02 +0000

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【 TiDB 使用环境】

【概述】 场景 + 问题概述
文件表，目前单表1.1T，7.6亿数据，已经走索引 KEY idx_fta (file_extension,transition_state,addtime), 但是还是需要500毫秒左右，GC时间设置是24小时， 发现扫描Key高：scan_detail: {total_process_keys: 706, total_keys: 4277610, rocksdb: {delete_skipped_count: 2122, key_skipped_count: 4580802
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【TiDB 版本】 v5.2.2

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对应模块日志（包含问题前后 1 小时日志）

SQL: desc analyze SELECT count(*) AS sum FROM eeo_files WHERE addtime > 1662974822 AND transition_state IN(0, 1, 4) AND file_extension IN(‘jpeg’, ‘jpg’, ‘png’, ‘bmp’) AND system_del = 0;

id                       	task     	estRows	operator info                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              	actRows	execution info                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       	memory 	disk
HashAgg_18               	root     	1      	funcs:count(Column#29)->Column#26                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          	1      	time:413.5ms, loops:2, partial_worker:{wall_time:413.481424ms, concurrency:5, task_num:1, tot_wait:2.067209901s, tot_exec:26.056µs, tot_time:2.067243399s, max:413.460881ms, p95:413.460881ms}, final_worker:{wall_time:413.538036ms, concurrency:5, task_num:1, tot_wait:2.067462191s, tot_exec:24.719µs, tot_time:2.067489543s, max:413.510606ms, p95:413.510606ms}                                                                                                                                              	9.55 KB	N/A
└─IndexLookUp_19         	root     	1      	                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           	81     	time:413.4ms, loops:2, index_task: {total_time: 396.6ms, fetch_handle: 396.6ms, build: 1.26µs, wait: 3.81µs}, table_task: {total_time: 2s, num: 1, concurrency: 5}                                                                                                                                                                                                                                                                                                                                                 	20.5 KB	N/A
  ├─IndexRangeScan_15    	cop[tikv]	14.11  	table:eeo_files, index:idx_fta(file_extension, transition_state, addtime), range:("bmp" 0 1662988682,"bmp" 0 +inf], ("bmp" 1 1662988682,"bmp" 1 +inf], ("bmp" 4 1662988682,"bmp" 4 +inf], ("jpeg" 0 1662988682,"jpeg" 0 +inf], ("jpeg" 1 1662988682,"jpeg" 1 +inf], ("jpeg" 4 1662988682,"jpeg" 4 +inf], ("jpg" 0 1662988682,"jpg" 0 +inf], ("jpg" 1 1662988682,"jpg" 1 +inf], ("jpg" 4 1662988682,"jpg" 4 +inf], ("png" 0 1662988682,"png" 0 +inf], ("png" 1 1662988682,"png" 1 +inf], ("png" 4 1662988682,"png" 4 +inf], keep order:false	726    	time:396.6ms, loops:3, cop_task: {num: 14, max: 396.4ms, min: 842.1µs, avg: 90.3ms, p95: 396.4ms, max_proc_keys: 315, p95_proc_keys: 315, tot_proc: 1.25s, tot_wait: 8ms, rpc_num: 14, rpc_time: 1.26s, copr_cache_hit_ratio: 0.29}, tikv_task:{proc max:438ms, min:0s, p80:284ms, p95:438ms, iters:22, tasks:14}, scan_detail: {total_process_keys: 706, total_keys: 4277610, rocksdb: {delete_skipped_count: 2122, key_skipped_count: 4580802, block: {cache_hit_count: 3655, read_count: 0, read_byte: 0 Bytes}}}	N/A    	N/A
  └─HashAgg_7            	cop[tikv]	1      	funcs:count(1)->Column#29                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  	81     	time:16ms, loops:2, cop_task: {num: 81, max: 10.4ms, min: 547.8µs, avg: 1.23ms, p95: 1.98ms, max_proc_keys: 301, p95_proc_keys: 12, tot_proc: 36ms, tot_wait: 16ms, rpc_num: 81, rpc_time: 98.8ms, copr_cache_hit_ratio: 0.00}, tikv_task:{proc max:9ms, min:0s, p80:1ms, p95:1ms, iters:81, tasks:81}, scan_detail: {total_process_keys: 726, total_keys: 1306, rocksdb: {delete_skipped_count: 330, key_skipped_count: 1834, block: {cache_hit_count: 4349, read_count: 0, read_byte: 0 Bytes}}}                  	N/A    	N/A
    └─Selection_17       	cop[tikv]	14.11  	eq(eo_osfile.eeo_files.system_del, 0)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      	726    	tikv_task:{proc max:9ms, min:0s, p80:1ms, p95:1ms, iters:81, tasks:81}                                                                                                                                                                                                                                                                                                                                                                                                                                               	N/A    	N/A
      └─TableRowIDScan_16	cop[tikv]	14.11  	table:eeo_files, keep order:false                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          	726    	tikv_task:{proc max:9ms, min:0s, p80:1ms, p95:1ms, iters:81, tasks:81}                                                                                                                                                                                                                                                                                                                                                                                                                                               	N/A    	N/A

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