Clickhouse uses bloom filters and other probabilistic data structures to index large chunks of data, for the most part though actually checking for rows ...
Oct 28, 2020 · Closed. Bloom filter for column of type UUID #16461. lloiacono opened this issue on Oct 28, 2020 · 1 comment. Labels. feature st-community-taken. Comments. lloiacono added the bug label on Oct 28, 2020. den-crane added feature and removed bug labels on Oct 28, 2020.
Jul 20, 2021 · Number_of_blocks = number_of_rows / (table_index_granularity * tokenbf_index_granularity) You can check the size of the index file in the directory of the partition in the file system. The file is named as skp_idx_ {index_name}.idx. In our case, the size of the index on the HTTP URL column is only 0.1% of the disk size of all data in that ...
28.10.2020 · Closed. Bloom filter for column of type UUID #16461. lloiacono opened this issue on Oct 28, 2020 · 1 comment. Labels. feature st-community-taken. Comments. lloiacono added the bug label on Oct 28, 2020. den-crane added feature and removed bug labels on Oct 28, 2020.
ClickHouse uses the sorting key as a primary key if the primary key is not defined ... Stores a Bloom filter that contains all ngrams from a block of data.
10.10.2020 · When I analyse the trace of my query in clickhouse client, it consistently shows: Index `route_index` has dropped 0 granules. Clearly my bloomfilter tokenbf index has no effect. Does anybody no why? By the way, my Route column has type String and the granularity of table MY_TABLE is 128.
Nov 29, 2019 · e6c85df. alexey-milovidov added a commit that referenced this issue Mar 23, 2021. Merge pull request #22007 from ClickHouse/add-test-7963. Verified. This commit was created on GitHub.com and signed with GitHub’s verified signature . GPG key ID: 4AEE18F83AFDEB23 Learn about vigilant mode .
07.03.2021 · select * from test where toYYYYMM (data_time) BETWEEN '202102' AND '202102' AND field1 ='123456789'. So, This SQL runs very slow: ~40s. I think that it is very fast because I use a query statement that has partition (date_time) and index key (field1) and the table sorted by field1. Before I do not use the index for the table, the performance is ...