postgresql

问题 Recently did a query which took about 9 minutes to complete. Attempting to determine why, I used EXPLAIN ANALYZE to help solve the problem. From the output, it looks as though everything has the appropriate indexes, it's just taking an extremely long time. I've put the query and the results below. Is it just taking this long due to the amount of data? Or is there something which I am doing wrong. Does my query need to fundamentally change, in order to improve the performance? Additional Info:

问题 Recently did a query which took about 9 minutes to complete. Attempting to determine why, I used EXPLAIN ANALYZE to help solve the problem. From the output, it looks as though everything has the appropriate indexes, it's just taking an extremely long time. I've put the query and the results below. Is it just taking this long due to the amount of data? Or is there something which I am doing wrong. Does my query need to fundamentally change, in order to improve the performance? Additional Info:

问题 i just installed pgadmin iii and try to connect server. I configured my setting name:localhost host: 127.0.0.1 port:5432 username:postgres but i always get this error The server doesn't accept connection: the connection library reports **could not connect to server : Connection refused Is server runing on host "127.0.0.1" and accepting TCP/IP connections on port 5432? However, i'm runing django and python on 127.0.0.1 What's missing? There's also a problem with mysql. I could not connect with

问题 i just installed pgadmin iii and try to connect server. I configured my setting name:localhost host: 127.0.0.1 port:5432 username:postgres but i always get this error The server doesn't accept connection: the connection library reports **could not connect to server : Connection refused Is server runing on host "127.0.0.1" and accepting TCP/IP connections on port 5432? However, i'm runing django and python on 127.0.0.1 What's missing? There's also a problem with mysql. I could not connect with

问题 select osmid,ST_X(shape),ST_Y(shape) from osmpoints where (osmpoints.osmid, osmpoints.osmtimestamp) IN (select osmid,MAX(osmtimestamp) from osmPoints GROUP BY osmid Having MAX(osmtimestamp) <= '2019-09-16T01:23:55Z' AND osmid in ('4426786454','1861591896','1861591869','1861591895', '4426786455','2038185115','1861591853','6797739995', '2299605892','6797739994','1861591898','2038185111','4426786454')); when I run this query, I get sorted rows based on osmid column. but my question is how can I

问题 I'm trying to create a trigger that populates a table everytime X amount of rows are added to other table. The logic would be: 1- check how many rows are in table A based on last date on table B. 2- once there are 1000 rows in table A from the last date on table B, add one row to table B Table A stores ticks from market and table B stores OHLC data (Open, High, Low, Close). Ticks have only 3 columns: date, bid and ask. Open is the first known price, Low is the min price, High is the max price

问题 I'm trying to create a trigger that populates a table everytime X amount of rows are added to other table. The logic would be: 1- check how many rows are in table A based on last date on table B. 2- once there are 1000 rows in table A from the last date on table B, add one row to table B Table A stores ticks from market and table B stores OHLC data (Open, High, Low, Close). Ticks have only 3 columns: date, bid and ask. Open is the first known price, Low is the min price, High is the max price

问题 I've been working on FHIR for a project and we are using PostgreSQL as a database. While reading docs, I've come to know about PL/Python and decided to give it a shot but I am unable to install the python extension. When I run the command CREATE EXTENSION pypthon3u; I get the following error Could not load library "C:/Program Files/PostgreSQL/12/lib/plpython3.dll": The specified module could not be found. I've checked this SO answer but it couldn't help. My PostgreSQL version: PostgreSQL 12.2

问题 Have a CentOS7 Linux machine running (not managed by me; have limited rights to/in it). Have a request to set PostgreSQL up in it. Just installed PostgreSQL from the CentOS repository: sudo yum install postgresql-server postgresql-contrib All good with it. Then did initialization of the database: sudo yum install postgresql-server postgresql-contrib All good with it. But then the start: sudo systemctl start postgresql Fails: Job for postgresql.service failed because the control process exited

问题 I am trying to update a table using a temporary table. Schema | Name | Type | Owner ------------+----------------------+----------+---------- pg_temp_11 | tmp_x | table | postgres public | entities | table | postgres However I am getting this error: UPDATE entities SET "Name" = "tmp_x.Name" FROM tmp_x WHERE "entities.Ent_ID" = "tmp_x.Ent_ID"; ERROR: column "tmp_x.Name" does not exist -- the column Name exists LINE 1: UPDATE entities SET "Name" = "tmp_x.Name" FROM tmp_x WHERE "... What is the