CREATE INDEX name_gin ON entity USING gin (name gin_trgm_ops); 该 浏览0提问于2013-01-11得票数 2 回答已采纳 1回答 PostgreSQL索引不用于查询 、 当我使用以下命令在time列上创建索引时,为了使查询速度更快:当我尝试使用“解释分析”运行简单命令时,如下所示SELECT *WHERE g.time >= NOW() - '1 ...
select pid,usename,query_start,query,client_addr from pg_stat_activity where pid<>pg_backend_pid() and state='active'; ## 查询等待事件 select pid,usename,datname,query,client_addr,wait_event_type,wait_event from pg_stat_activity where pid <>pg_backend_pid() and wait_event is not nul...
so that when there are many matches the most relevant ones can be shown first. PostgreSQL provides two predefined ranking functions, which take into account lexical, proximity, and structural information; that is, they consider how often the query terms appear in the document, how close together ...
看下select语句生成的parse tree,query等是什么样的。 CREATE TABLE STUDENT (sno INT primary key, sname VARCHAR(10) not null, ssex varchar(10)); insert into student(sno,sname,ssex) values(1,'zhangsan','male'); insert into student(sno,sname,ssex) values(2,'lisi','male'); insert into ...
pg_replication:query: "SELECT CASE WHEN NOT pg_is_in_recovery() THEN 0 ELSE GREATEST (0, EXTRACT(EPOCH FROM (now() - pg_last_xact_replay_timestamp())) END AS lag"master: truemetrics:- lag:usage: "GAUGE"description: "Replication lag behind master in seconds"pg_postmaster:query: "SELEC...
I created custom array adapter for my spinner control but when clicking an item from the list it's not selected. Here my code: And the spinner layout: That's how I use the adapter: You need to return ... Is it possible to query the most recent additions to a table/column family in...
For SSH Login Username, enter the username to use when connecting to the bastion server. Note: This is the operating system username and not the Postgres username. For authentication: If you selected SSH Key Authentication, set the SSH Private Key to the private Key that you are using to ...
Query Optimizer# Postgres has a better query optimizer. More details in this rant. Online DDL# Postgres provides online DDL for the following cases: ADD COLUMN without a default value. (Postgres 11+) ADD COLUMN with a default value. Specify CONCURRENTLY when running CREATE INDEX. MySQL provides...
(queryDesc=queryDesc@entry=0x1a64a68, direction=direction@entry=ForwardScanDirection, count=count@entry=0, execute_once=<optimized out>) at execMain.c:513 #10 0x0000000000ba326b in PortalRunSelect (portal=0x19772d8, forward=<optimized out>, count=0, dest=<optimized out>) at pquery.c:...
NOT IN ('pg_catalog', 'information_schema') GROUP BY table_schema, table_name, relid, n_live_tup ), null_headers AS ( -- calculate null header sizes -- omitting tables which dont have complete stats -- and attributes which aren't visible SELECT hdr + 1 + (sum( CASE WHEN null_...