unlogged table是为临时数据设计的,写入性能较高,但是当postgresql进程崩溃时会丢失数据。 创建一张普通表test和一张unlogged表test,测试性能情况 普通表: ; "复制代码") test=# create table test(a int); CREATE TABLE test=# \timing Timing is on. test=# insert into test select generate_series(1,10000...
unlogged table是为临时数据设计的,写入性能较高,但是当postgresql进程崩溃时会丢失数据。 创建一张普通表test和一张unlogged表test,测试性能情况 普通表: test=#createtabletest(aint);CREATETABLEtest=# \timing Timingison. test=#insertintotestselectgenerate_series(1,1000000);INSERT01000000Time:3603.715ms unlogged...
postgres=# \help create table Command: CREATE TABLE Description: define a new table Syntax: CREATE [ [ GLOBAL | LOCAL ] { TEMPORARY | TEMP } | UNLOGGED ] TABLE [ IF NOT EXISTS ] table_name ( [ { column_name data_type [ STORAGE { PLAIN | EXTERNAL | EXTENDED | MAIN | DEFAULT } ]...
CREATE TEMPORARY TABLE tempory_table( id int, system_info text ); CREATE TABLE tempory_table ( id int, system_info text, type_d varchar(10) ); insert into tempory_table (id,system_info) values (1,'system_info'); insert into tempory_table (id,system_info,type_d) values (2,'system_...
unlogged table是为临时数据设计的,写入性能较高,但是当postgresql进程崩溃时会丢失数据。 创建一张普通表test和一张unlogged表test,测试性能情况 普通表: test=#createtabletest(aint);CREATETABLEtest=# \timing Timingison. test=#insertintotestselectgenerate_series(1,1000000);INSERT01000000Time:3603.715ms ...
示例函数:create or replace function ads.fn_create_tmp_tb (n integer, s character varying)returns voidas $$begin create local temporary table if not exists tmp_tb_01 (idx integer, user_name character varying); insert into tmp_tb_01 (idx, user_name) select n, s; ...
postgresql CREATE TABLE http://www.yiibai.com/manual/postgresql/sql-createtable.html 名称 CREATE TABLE -- 定义一个新表 语法 CREATE [ [ GLOBAL | LOCAL ] { TEMPORARY | TEMP } ] TABLE table_name ( [ { column_name data_type [ DEFAULT default_expr ] [ column_constraint [ ... ] ]...
create temp table aaa (c1 int) on commit DELETE ROWS;会在提交时 删除事务内对当前temp table 的更新行,temp table本身的drop会在backend 退出时。 create temp table aaa (c1 int) on commit preserve rows会在提交时保留对 temp table 事务内的更新。
CREATE [ [ GLOBAL | LOCAL ] { TEMPORARY | TEMP } | UNLOGGED ] TABLE [ IF NOT EXISTS ] table_name ( [ { column_name data_type [ COLLATE collation ] [ column_constraint [ ... ] ] | table_constraint | LIKE source_table [ like_option ... ] } [, ... ] ] ) [ INHERITS ( ...
CREATE TABLE定义一个新表。CREATE [ [ GLOBAL | LOCAL ] { TEMPORARY | TEMP } ] TABLE table_name ( { column_name data_type [ DEFAULT default_expr ] [ column_constraint [ ... ] ] | table_constraint | LIKE parent_table [ { INCLUDING | EXCLUDING } DEFAULTS ] } [, ... ] ) [ ...