teledb=# set max_parallel_workers_per_gather to 0; SET Time: 0.214 ms teledb=# select count(1) from t_count; count ---------- 20000000 (1 row) Time: 2700.569 ms (00:02.701) teledb=# set max_parallel_workers_per_gather to 2; SET Time: 0.269 ms teledb=#
teledb=# set max_parallel_workers_per_gather to 0; SET Time: 0.214 ms teledb=# select count(1) from t_count; count ---------- 20000000 (1 row) Time: 2700.569 ms (00:02.701) teledb=# set max_parallel_workers_per_gather to 2; SET Time: 0.269 ms teledb=#
teledb=# set max_parallel_workers_per_gather to 0; SET Time: 0.214 ms teledb=# select count(1) from t_count; count ---------- 20000000 (1 row) Time: 2700.569 ms (00:02.701) teledb=# set max_parallel_workers_per_gather to 2; SET Time: 0.269 ms teledb=#
teledb=# set max_parallel_workers_per_gather to 0; SET Time: 0.214 ms teledb=# select count(1) from t_count; count ---------- 20000000 (1 row) Time: 2700.569 ms (00:02.701) teledb=# set max_parallel_workers_per_gather to 2; SET Time: 0.269 ms teledb=#
teledb=# set max_parallel_workers_per_gather to 0; SET Time: 0.214 ms teledb=# select count(1) from t_count; count ---------- 20000000 (1 row) Time: 2700.569 ms (00:02.701) teledb=# set max_parallel_workers_per_gather to 2; SET Time: 0.269 ms teledb=#
teledb=# set max_parallel_workers_per_gather to 0; SET Time: 0.214 ms teledb=# select count(1) from t_count; count ---------- 20000000 (1 row) Time: 2700.569 ms (00:02.701) teledb=# set max_parallel_workers_per_gather to 2; SET Time: 0.269 ms teledb=#
为默认数据 teledb=# alter database teledb_db_new set search_path to public, pg_catalog; ALTER DATABASE alter database不支持修改的项目 项目 备注 encoding 编码 lc_collate 排序规则 lc_ctype 分组规则