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【详述】select COLUMN_NAME from information_schema.COLUMNS where table_name = xxx耗时长
【背景】创建1个单表，然后通过视图查询某些字段，查询视图的元数据时，有时候耗时长，达到3924毫秒。
【业务影响】 查询元数据表耗时长
【StarRocks版本】2.5.4
【集群规模】3fe+3be
【机器信息】公有云 ，fe：8C16G3，be：8C32G3
【联系方式】StarRocks社区群8
【附件】
- Profile信息，
Query:
Summary:- Query ID: 42b4bbad-246d-11ee-be7c-0242a2c4de0d
- Start Time: 2023-07-17 14:43:38
- End Time: 2023-07-17 14:43:38
- Total: 13ms
- Query Type: Query
- Query State: EOF
- StarRocks Version: 2.5.4-1021a92
- User: app_user
- Default Db: data_service
- Sql Statement: /* tid = 1689573300104 */ select COLUMN_NAME from information_schema.COLUMNS where table_name = ‘data_view_v2’
- QueryCpuCost: 0
- QueryMemCost: 0.000
- Variables: parallel_fragment_exec_instance_num=1,max_parallel_scan_instance_num=-1,pipeline_dop=0,enable_adaptive_sink_dop=false
- Collect Profile Time: 0
Planner: - Analyzer: 0ms / 1
- CoordDeliverExec: 1ms / 1
- CoordPrepareExec: 0ms / 1
- ExecPlanBuild: 0ms / 1
- Optimizer: 0ms / 1
- Total: 0ms / 1
Optimizer:- CostBaseOptimize: 0ms / 1
- PhysicalRewrite: 0ms / 1
- RuleBaseOptimize: 0ms / 1
- preprocessMvs: 0ms / 1
Execution Profile 42b4bbad-246d-11ee-be7c-0242a2c4de0d:(Active: 12.341ms[12341839ns], % non-child: 100.00%)
Fragment 0:
Instance 42b4bbad-246d-11ee-be7c-0242a2c4de0e (host=TNetworkAddress(hostname:10.9.2.61, port:9060)):(Active: 9.562ms[9562051ns], % non-child: 0.00%)- Address: 10.9.2.61:9060
- MemoryLimit: 2.00 GB
- PeakMemoryUsage: 13.27 KB
- RowsProduced: 78
DataBufferSender (dst_fragment_instance_id=42b4bbad-246d-11ee-be7c-0242a2c4de0e):- AppendChunkTime: 13.717us
- ResultRendTime: 40.381us
- TupleConvertTime: 12.186us
- NumSentRows: 78
PROJECT_NODE (id=1):(Active: 9.589ms[9589255ns], % non-child: 0.84%) - CommonSubExprComputeTime: 426ns
- ExprComputeTime: 858ns
- PeakMemoryUsage: 0.00
- RowsReturned: 78
- RowsReturnedRate: 8.134K /sec
SCHEMA_SCAN_NODE (id=0):(Active: 9.486ms[9486057ns], % non-child: 76.86%)- BytesRead: 0.00
- FERPC: 9.379ms
- FillChunk: 20.547us
- FilterTime: 11.911us
- NumDiskAccess: 0
- PeakMemoryUsage: 0.00
- RowsRead: 0
- RowsReturned: 78
- RowsReturnedRate: 8.222K /sec
- ScannerThreadsInvoluntaryContextSwitches: 0
- ScannerThreadsTotalWallClockTime: 0ns
- MaterializeTupleTime(*): 0ns
- ScannerThreadsSysTime: 0ns
- ScannerThreadsUserTime: 0ns
- ScannerThreadsVoluntaryContextSwitches: 0
- TotalRawReadTime(*): 0ns
- TotalReadThroughput: 0.0 /sec
- AppendChunkTime: 13.717us
