PG通用 常用 功能

**：

檢視各個表所占用記憶體

select table_schema || 『.』 || table_name as table_full_name, pg_size_pretty(pg_total_relation_size(『」』 || table_schema || 『」.」』 || table_name || 『」』)) as

size
from information_schema.tables 
order
by pg_total_relation_size(『」』 || table_schema || 『」.」』 || table_name || 『」』) desc limit 20;

select setval(『scm_inout_daily_acount_id_seq』, max(id)) from scm_inout_daily_acount;

select nextval(『scm_inout_daily_acount_id_seq』);

select currval(『scm_inout_daily_acount_id_seq』);

select 

relname, indexrelname, idx_scan, idx_tup_read, idx_tup_fetch 
from pg_stat_user_indexes 
order
by idx_scan asc, idx_tup_read asc, idx_tup_fetch asc;

select 

relname, indexrelname, idx_scan, idx_tup_read, idx_tup_fetch 
from pg_stat_user_indexes 
where relname = table_name 
order
by idx_scan asc, idx_tup_read asc, idx_tup_fetch asc;

select 

t.tablename, 
indexname, 
c.reltuples as num_rows, 
pg_size_pretty(pg_relation_size(quote_ident(t.tablename)::text)) as table_size, 
pg_size_pretty(pg_relation_size(quote_ident(indexrelname)::text)) as index_size, 
case
when indisunique then 『y』 
else 『n』 
endas
unique, 
idx_scan as number_of_scans, 
idx_tup_read as tuples_read, 
idx_tup_fetch as tuples_fetched 
from pg_tables t 
left
outer
join pg_class c on t.tablename=c.relname 
left
outer
join 
( select c.relname as ctablename, ipg.relname as indexname, x.indnatts as number_of_columns, idx_scan, idx_tup_read, idx_tup_fetch, indexrelname, indisunique from pg_index x 
join pg_class c on c.oid = x.indrelid 
join pg_class ipg on ipg.oid = x.indexrelid 
join pg_stat_all_indexes psai on x.indexrelid = psai.indexrelid ) 
as foo 
on t.tablename = foo.ctablename 
where t.schemaname=』public』 
order
by1,2;

select 

pg_class.relname, 
pg_size_pretty(pg_class.reltuples::bigint) as rows_in_bytes, 
pg_class.reltuples as num_rows, 
count(indexname) as number_of_indexes, 
case
when x.is_unique = 1
then 『y』 
else 『n』 
endas
unique, 
sum(case
when number_of_columns = 1
then
1else
0end) as single_column, 
sum(case
when number_of_columns is
null
then
0when number_of_columns = 1
then
0else
1end) as multi_column 
from pg_namespace 
left
outer
join pg_class on pg_namespace.oid = pg_class.relnamespace 
left
outer
join 
(select indrelid, 
max(cast(indisunique as
integer)) as is_unique 
from pg_index 
group
by indrelid) x 
on pg_class.oid = x.indrelid 
left
outer
join 
( select c.relname as ctablename, ipg.relname as indexname, x.indnatts as number_of_columns from pg_index x 
join pg_class c on c.oid = x.indrelid 
join pg_class ipg on ipg.oid = x.indexrelid ) 
as foo 
on pg_class.relname = foo.ctablename 
where 
pg_namespace.nspname=』public』 
and pg_class.relkind = 『r』 
group
by pg_class.relname, pg_class.reltuples, x.is_unique 
order
by2;

pg_dump -s -t ***x.tbtest testdb > tbnode.out

pg_dump -h mdw -t ***x.tbtest testdb > tbnode.sql

pg_dump -h mdw -t ***x.tbtest -a testdb > tbnode.sql

psql -u postgres testdb < tbnode.out

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