WHERE category_id=1 AND user_id=2; This is what Postgres 7.1 returns (exactlyasI expected) NOTICE:QUERY PLAN: Index Scan using mytable_categoryid_userid on mytable(cost=0.00..2.02 rows=1 width=16) EXPLAIN 以上是postgres的数据,可以看到该数据库在查询的时候使用了一个索引(一个好开始),而且...
.14933.791 rows=10 loops=1) -> Index Scan Backward using idx_timestamp on stac (cost=0.43..5229344.35 rows=988799 width=24) (actual time=0.007..2885.512 rows=3535779 loops=1) Filter: ((field2 > '2020-01-01 18:59:59.999999-05'::timestamp with time ...
support of index suffix truncation. The changes of above are backward-compatible, pg_upgrade doesn't need special handling of B-tree indexes for that. Bump catalog version Author: Anastasia Lubennikova with contribition by Alexander Korotkov and me Reviewed by: Peter Geoghegan, Tomas Vondra, ...
SortKey: (CASE...END), aircrafts.modelDESC -> Seq Scanonaircrafts (3rows) (注意,最终执行计划会选择顺序扫描,忽略之前设置的enable_seqscan = off。因为这个设置并不会放弃表扫描,只是设置他的成本---查看costs on的执行计划) 若有使用索引,创建索引时指定排序的方向: 1 2 3 4 5 6 7 8 9 10 11...
Re: Index Scan Backward Slow From David Osborne Date: 01 May 2015, 11:06:57 Simple... that did it... thanks! dev=> create index on table(code,row_id); CREATE INDEX Time: 38088.482 ms dev=> explain (analyse,buffers) select row_id as last_row_id from table where code='XX' order...
backward scan:是否能够按照相反的顺序返回结果。此属性只有在访问方法支持索引扫描才有意义。 Column Properties: => SELECT p.name, pg_index_column_has_property('seats_pkey', 1, p.name) FROM unnest(array['asc', 'desc', 'nulls_first', 'nulls_last', 'orderable','distance_orderable', '...
If you allow a suggestion, in this case, the default should not have changed, but rather you could have given an option to enable transaction lock for whoever uses PgBouncer and keep the product backward compatible for everyone else, then in the next major version make the breaking change and...
12](https://github.com/sequinstream/sequin "https://github.com/sequinstream/sequin")|An open source message stream built on Postgres.| 971 972 |[serialtest](https://github.com/wh201906/SerialTest "https://github.com/wh201906/SerialTest")|[0.3.5](https://github.com/wh201906/SerialTest...