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使用Postgresql 實現(xiàn)快速插入測試數(shù)據(jù)

更新時間：2021年01月05日 09:05:54 作者：kmblack1

這篇文章主要介紹了使用Postgresql 實現(xiàn)快速插入測試數(shù)據(jù)，具有很好的參考價值，希望對大家有所幫助。一起跟隨小編過來看看吧

1.創(chuàng)建常規(guī)的企業(yè)信息表

create table t_centerprises(
 objectid bigint not null, /*唯一編號(6位行政區(qū)號+6位sn)*/
 divid uuid not null, /*行政區(qū)唯一代碼*/
 name text not null, /*企業(yè)名稱*/
 address text not null, /*企業(yè)地址*/
 post text, /*企業(yè)郵編*/
 contacts text, /*聯(lián)系人*/
 tel text, /*聯(lián)系電話*/
 fax text, /*傳真*/
 describe text, /*企業(yè)備注*/ 
 date timestamp default now() not null, /*創(chuàng)建日期*/
 constraint pk_centerprisess_objectid primary key (objectid),
 constraint fk_centerprises_divid foreign key(divid) references ts_divisions(objectid) on delete cascade
);
create index idx_centerprises_divid on t_centerprises(divid);

2.需要使用的函數(shù)

/*轉(zhuǎn)換16進制到字符*/
drop function if exists hex_to_string(text);
create or replace function hex_to_string( text) 
 returns text as 
$$
 declare
 result text;
 begin
 execute 'select U&''\' || $1 || '''' INTO result;
 return result;
 end;
$$ language plpgsql;
 
/*隨機生成漢字
 漢字范圍U+4E00..U+9FA5
*/
drop function if exists gen_random_zh(int,int);
create or replace function gen_random_zh(imin int,imax int) 
 returns text as 
$$
 declare
 vlen integer;
 result text;
 begin
 result := '';
 vlen = floor(random()*(imax-imin)+imin);
 for i in 1..vlen loop
  result := result || hex_to_string(to_hex(floor(random()*(42191-19968)+19968)::integer));
 end loop;
 return result;
 end;
$$ language plpgsql;

3.常規(guī)測試數(shù)據(jù)插入(5000000條)

insert into t_centerprises(objectid,divid,name,address,post,contacts,tel,fax,describe)
  select (vdivid|| lpad(id::text,6,'0'))::bigint as objectid,'110101',
  gen_random_zh(5,25) as name,gen_random_zh(10,50) as address,
  floor(random()*(699999-600000)+600000) as post,gen_random_zh(2,8) as contacts,
  floor(random()*(69999999-60000000)+60000000) as tel,floor(random()*(69999999-60000000)+60000000) as fax,
  gen_random_zh(32,128) as describe
 from generate_series(1,5000000) as id;

在普通pc機上插入,大概完成時間約8小時,過程不可監(jiān)控,并且cpu/內(nèi)存占用率高,磁盤基本滿負荷動作,讀寫率基本上都是100%.

4.改進后的方法, 插入(10000000條)

do $$
 declare vStart bigint;
 declare vEnd bigint;
 declare MAXVALE bigint;
 declare INTERVAL bigint;
 declare vprovince integer;
 declare vprefecture integer;
 declare vcounty integer;
 declare vdivid text;
 declare vdividex uuid;
begin
 vprovince := 10;vprefecture := 1;vcounty := 1;
 
 MAXVALE := 1000000;
 INTERVAL := 1000; vStart := 1 ;vEnd := INTERVAL;
 vdivid := (lpad(vprovince::text,2,'0') || lpad(vprefecture::text,2,'0') || lpad(vcounty::text,2,'0'))::text;
 vdividex := (select objectid from ts_divisions where province=vprovince and prefecture=vprefecture and county=vcounty);
 loop 
 insert into t_centerprises(objectid,divid,name,address,post,contacts,tel,fax,describe)
  select (vdivid|| lpad(id::text,6,'0'))::bigint as objectid,vdividex as divid,
  gen_random_zh(5,25) as name,gen_random_zh(10,50) as address,
  floor(random()*(699999-600000)+600000) as post,gen_random_zh(2,8) as contacts,
  floor(random()*(69999999-60000000)+60000000) as tel,floor(random()*(69999999-60000000)+60000000) as fax,
  gen_random_zh(32,128) as describe
 from generate_series(vStart,vEnd) as id;
 
 raise notice '%', vEnd;
 vStart := vEnd + 1; vEnd := vEnd + INTERVAL;
 if( vEnd > MAXVALE ) then
  return;
 elsif(vEnd = MAXVALE) then
  vEnd := vEnd - 1;
 end if;
 end loop;
end$$;

因為運算原因, cpu/內(nèi)存占用率仍然很高, 硬盤負荷較小,讀寫率也比較低,大概完成時間約1.5小時.

補充：postgreSQL數(shù)據(jù)庫向表中快速插入1000000條數(shù)據(jù)

不用創(chuàng)建函數(shù)，直接向表中快速插入1000000條數(shù)據(jù)

create table tbl_test (id int, info text, c_time timestamp);
insert into tbl_test select generate_series(1,100000),md5(random()::text),clock_timestamp();
select count(id) from tbl_test; --查看個數(shù)據(jù)條數(shù)