## Brin Index在 Greenplum 7中的理论与实现 --《Greenplum 7 新版本大剧透》系列直播 讲师：陈金豹，Greenplum内核研发 活动时间：2021年4月28日 20:00 - 21:00 #### 欢迎访问Greenplum中文社区：cn.greenplum.org ## Brin Index 在Greenplum 7中的理论与实践 陈金豹, VMWare内核工程师 ## 目录 Brin Index On Heap AppendOnly Table Brin在AppendOnly Table上的实现 性能测试 ## Block Range Index 存储数据块中元组字段的最大最小值，用于过滤不符合条件的数据块 1c443857/p6_2.jpg) ## Brin的优势和劣势 优势： 占用空间小 创建快 劣势： 只有在数据具有一定分布特点时才有用 ## Brin的体积 Brin tuple: 20bytes Block Range: 8K * 20 = 160K Brin比Heap小8000倍 1 TB的Heap表只需要125M的Brin Block Rang ![Image](/

Replication Functions ..... 343 9.26.7. Database Object Management Functions ..... 347 9.26.8. Index Maintenance Functions ..... 350 9.26.9. Generic File Access Functions ..... 350 9.26.10. Advisory and Related Constructs ..... 368 11. Indexes ..... 371 11.1. Introduction ..... 371 11.2. Index Types ..... 372 11.3. Multicolumn Indexes ..... 374 11.4. Indexes and ORDER BY ..... 375 11 Classes and Operator Families ..... 381 11.10. Indexes and Collations ..... 382 11.11. Examining Index Usage ..... 383 12. Full Text Search ..... 385 12.1. Introduction ..... 385 12.1.1. What Is a

Shapefile Dumper 52 4.9 Spatial Indexes 52 4.9.1 GiST Indexes 53 4.9.2 BRIN Indexes 53 4.9.3 SP-GiST Indexes 55 4.9.4 Tuning Index Usage 56 5 Spatial Queries 57 5.1 Determining Spatial Relationships PostgreSQL releases, X3D support, TIGER geocoder support, management functions. Darafei Praliaskouski Index improvements, bug fixing and geometry/geography function improvements, SFCGAL, raster, GitHub curation project. General bug fixing, geography support, geography and geometry index support (2D, 3D, nD index and anything spatial index), underlying geometry internal structures, GEOS functionality integration

MaterializeMySQL Database Engine • Custom HTTP Handler • MySQL Database Engine • BloomFilter Skipping Index • Query Predicate Optimizer • And more ~ 400+ commit ); for (size_t index = 0; index < rows_data.size(); index += 2) { writeable_rows_mask[index + 1] = true; writeable_rows_mask[index] = differenceSortingKeys(DB::get(rows_data[index]), DB::get(rows_data[index + 1]), sorting_columns_index); } for (size_t index = 0; index < rows_data.size(); index += 2) { if (likely(

specific index ## ☀️ ☁️ ☁️ 1 In [149]: a.shape 2 Out $$ 149 $$ : torch.Size([4, 3, 28, 28]) 3 4 In [159]: a.index_select(0, 5 0ot{h50ens0o({h,S]iæ($hapa, 28, 28]) 6 7 In [167]: a.index_select(1 0at[h6?ns0o(h,S]z£($Hape, 28, 28]) 10 In [168]: a.index_select(2, torch.arange(28)).shape 11 Out[168]: torch.Size([4, 3, 28, 28]) 13 In [169]: a.index_select(2, torch.arange(8)).shape 14 Out[169]: torch 14 In [175]: torch.masked_select(x, mask).shape 15 Out[175]: torch.Size([3]) ## select by flatten index ## ● 5 In [177]: torch.take(src, torch.tensor([0, 2, 6 0])): tensor([4, 5, 8]) ## 下一课时 Tensor变换

CASE, and Related Constructs .....211 11. Indexes .....214 11.1. Introduction .....214 11.2. Index Types .....215 11.3. Multicolumn Indexes .....216 11.4. Combining Multiple Indexes .....217 Expressions .....218 11.7. Partial Indexes .....219 11.8. Operator Classes .....222 11.9. Examining Index Usage .....223 12. Concurrency Control .....225 12.1. Introduction .....225 12.2. Transaction 17.8. Run-Time Statistics .....304 17.8.1. Statistics Monitoring .....304 17.8.2. Query and Index Statistics Collector .....304 17.9. Automatic Vacuuming .....305 17.10. Client Connection Defaults

869 9.7.2 TiFlash_schema_apply_duration ··· 869 9.7.3 TiFlash_raft_read_index_duration ··· 870 9.7.4 TiFlash_raft_wait_index_duration ··· 870 9.8 自定义监控组件的配置 ··· 870 9.8.1 自定义 Prometheus 配置 ··· 871 Continuous Profiling ··· 4586 17.4 D ··· 4587 17.4.1 Dynamic Pruning ··· 4587 17.5 I ··· 4587 17.5.1 Index Merge ··· 4587 17.5.2 In-Memory Pessimistic Lock ··· 4587 17.6 L ··· 4587 17.6.1 Leader/Follower/Learner PDF查看两个LTS版本之间的所有release notes。下表列出了从7.2.0到7.5.0的一些关键特性： 分类 功能 描述 可扩展性与性能 支持并行运行多个 ADD INDEX 语句 通过该功能，为同一个表添加多个索引的任务可以变为并发运行。以前同时运行2个添加索引语句X和 $ \hookrightarrow $ Y需要花费X的时间+Y的时间，现在在一

CASE, and Related Constructs .....316 11. Indexes .....318 11.1. Introduction .....318 11.2. Index Types .....319 11.3. Multicolumn Indexes .....321 11.4. Indexes and ORDER BY .....322 11.5. Classes and Operator Families .....327 11.10. Indexes and Collations .....329 11.11. Examining Index Usage .....329 12. Full Text Search .....331 12.1. Introduction .....331 12.1.1. What Is a Document ..361 12.8.2. Parser Testing.....363 12.8.3. Dictionary Testing.....364 12.9. GiST and GIN Index Types.....365 12.10. psql Support.....366 12.11. Limitations.....369 12.12. Migration from Pre-8

Shapefile Dumper 50 4.9 Spatial Indexes 50 4.9.1 GiST Indexes 51 4.9.2 BRIN Indexes 51 4.9.3 SP-GiST Indexes 53 4.9.4 Tuning Index Usage 53 5 Spatial Queries 55 5.1 Determining Spatial Relationships 14.2.17 Topology_Load_Tiger 739 14.2.18 Set_Geocode_Setting 741 # 5 PostGIS Special Functions Index 743 15.1 PostGIS Aggregate Functions 743 15.2 PostGIS Window Functions 743 15.3 PostGIS SQL-MM PostgreSQL releases, X3D support, TIGER geocoder support, management functions. Darafei Praliaskouski Index improvements, bug fixing and geometry/geography function improvements, SFCGAL, raster, GitHub curation

Shapefile Dumper 52 4.9 Spatial Indexes 52 4.9.1 GiST Indexes 53 4.9.2 BRIN Indexes 53 4.9.3 SP-GiST Indexes 55 4.9.4 Tuning Index Usage 56 5 Spatial Queries 57 5.1 Determining Spatial Relationships PostgreSQL releases, X3D support, TIGER geocoder support, management functions. Darafei Praliaskouski Index improvements, bug fixing and geometry/geography function improvements, SFCGAL, raster, GitHub curation project. General bug fixing, geography support, geography and geometry index support (2D, 3D, nD index and anything spatial index), underlying geometry internal structures, GEOS functionality integration