VMware Greenplum v6.18 Documentationindex is impossible. However, you can roughly estimate the size of an index using these formulas. B-tree: unique_values * (data_type_size + 24 bytes) Bitmap: (unique_values * number_of_rows * 1 bit * compression_ratio loading data into a table. After the load, re-create the indexes for the table. Create selective B-tree indexes. Do not create bitmap indexes on columns that are updated. Avoid using bitmap indexes for data, an index access method means only the necessary pages are uncompressed. Create selective B-tree indexes. Index selectivity is a ratio of the number of distinct values a column has divided by the0 码力 | 1959 页 | 19.73 MB | 1 年前3
VMware Greenplum v6.19 Documentationindex is impossible. However, you can roughly estimate the size of an index using these formulas. B-tree: unique_values * (data_type_size + 24 bytes) Bitmap: (unique_values * number_of_rows * 1 bit * compression_ratio loading data into a table. After the load, re-create the indexes for the table. Create selective B-tree indexes. Do not create bitmap indexes on columns that are updated. Avoid using bitmap indexes for data, an index access method means only the necessary pages are uncompressed. Create selective B-tree indexes. Index selectivity is a ratio of the number of distinct values a column has divided by the0 码力 | 1972 页 | 20.05 MB | 1 年前3
VMware Greenplum v6.17 Documentationindex is impossible. However, you can roughly estimate the size of an index using these formulas. B-tree: unique_values * (data_type_size + 24 bytes) Bitmap: (unique_values * number_of_rows * 1 bit * compression_ratio loading data into a table. After the load, re-create the indexes for the table. Create selective B-tree indexes. Do not create bitmap indexes on columns that are updated. Avoid using bitmap indexes for pages are uncompressed. VMware Greenplum v6.17 Documentation VMware, Inc. 268 Create selective B-tree indexes. Index selectivity is a ratio of the number of distinct values a column has divided by the0 码力 | 1893 页 | 17.62 MB | 1 年前3
VMware Tanzu Greenplum v6.20 Documentationmodule. This module provides sample generalized inverted index (GIN) operator classes that implement B-tree equivalent behavior for certain data types. Greenplum 6.20.0 now bundles the pg_trgm PostgreSQL index is impossible. However, you can roughly estimate the size of an index using these formulas. B-tree: unique_values * (data_type_size + 24 bytes) Bitmap: (unique_values * =number_of_rows * 1 bit * loading data into a table. After the load, re-create the indexes for the table. Create selective B-tree indexes. Do not create bitmap indexes on columns that are updated. Avoid using bitmap indexes for0 码力 | 1988 页 | 20.25 MB | 1 年前3
VMware Greenplum 7 Documentationthe CREATE AGGREGATE command. You can now use the CLUSTER command on append-optimized tables over B-tree indexes. The SELECT SQL command now supports the SKIP LOCKED option. The new command IMPORT FOREIGN size of an index using these formulas. VMware Greenplum 7 Documentation VMware by Broadcom 191 B-tree: unique_values * (data_type_size + 24 bytes) Bitmap: (unique_values * =number_of_rows * 1 bit * supported with append-optimized tables. CLUSTER on append-optimized tables is only supported over B-tree indexes. Choosing Row or Column-Oriented Storage Greenplum provides a choice of storage orientation0 码力 | 2221 页 | 14.19 MB | 1 年前3
VMware Greenplum 6 DocumentationResolves an issue where running REFRESH MATERIALIZED VIEW against an append-only materialized view with b-tree indexes returned the error ERROR:relation"pg_aoblkdir_xxxx" already exists. 33071 Resolves a bug module. This module provides sample generalized inverted index (GIN) operator classes that implement B-tree equivalent behavior for certain data types. Greenplum 6.20.0 now bundles the pg_trgm PostgreSQL index is impossible. However, you can roughly estimate the size of an index using these formulas. B-tree: unique_values * (data_type_size + 24 bytes) Bitmap: (unique_values * =number_of_rows * 1 bit *0 码力 | 2445 页 | 18.05 MB | 1 年前3
VMware Greenplum v6.25 DocumentationResolves an issue where running REFRESH MATERIALIZED VIEW against an append-only materialized view with b-tree indexes returned the error ERROR:relation"pg_aoblkdir_xxxx" already exists. 33071 Resolves a bug module. This module provides sample generalized inverted index (GIN) operator classes that implement B-tree equivalent behavior for certain data types. Greenplum 6.20.0 now bundles the pg_trgm PostgreSQL index is impossible. However, you can roughly estimate the size of an index using these formulas. B-tree: unique_values * (data_type_size + 24 bytes) Bitmap: (unique_values * =number_of_rows * 1 bit *0 码力 | 2400 页 | 18.02 MB | 1 年前3
VMware Tanzu Greenplum 6 Documentationmodule. This module provides sample generalized inverted index (GIN) operator classes that implement B-tree equivalent behavior for certain data types. Greenplum 6.20.0 now bundles the pg_trgm PostgreSQL size of an index using these formulas. VMware Tanzu Greenplum 6 Documentation VMware, Inc. 390 B-tree: unique_values * (data_type_size + 24 bytes) Bitmap: (unique_values * =number_of_rows * 1 bit * supported with append-optimized tables. CLUSTER on append-optimized tables is only supported over B-tree indexes. Choosing Row or Column-Oriented Storage Greenplum provides a choice of storage orientation0 码力 | 2311 页 | 17.58 MB | 1 年前3
VMware Tanzu Greenplum v6.21 Documentationmodule. This module provides sample generalized inverted index (GIN) operator classes that implement B-tree equivalent behavior for certain data types. Greenplum 6.20.0 now bundles the pg_trgm PostgreSQL index is impossible. However, you can roughly estimate the size of an index using these formulas. B-tree: unique_values * (data_type_size + 24 bytes) Bitmap: (unique_values * =number_of_rows * 1 bit * supported with append-optimized tables. CLUSTER on append-optimized tables is only supported over B-tree indexes. Choosing Row or Column-Oriented Storage Greenplum provides a choice of storage orientation0 码力 | 2025 页 | 33.54 MB | 1 年前3
VMware Greenplum 6 Documentationmodule. This module provides sample generalized inverted index (GIN) operator classes that implement B-tree equivalent behavior for certain data types. Greenplum 6.20.0 now bundles the pg_trgm PostgreSQL estimate the size of an index using these formulas. VMware Greenplum 6 Documentation VMware, Inc 406 B-tree: unique_values * (data_type_size + 24 bytes) Bitmap: (unique_values * =number_of_rows * 1 bit * supported with append-optimized tables. CLUSTER on append-optimized tables is only supported over B-tree indexes. Choosing Row or Column-Oriented Storage Greenplum provides a choice of storage orientation0 码力 | 2374 页 | 44.90 MB | 1 年前3
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