Hi,

I try to restore a table on U16.04, but it's ten times slower than on U14.04. 
This is the definition of the table:


testdb=# \d photos_searchlog

Table "public.photos_searchlog"
  Column  |           Type           | Collation | Nullable |                   
Default
----------+--------------------------+-----------+----------+----------------------------------------------
 id       | integer                  |           | not null | 
nextval('photos_searchlog_id_seq'::regclass)
 created  | timestamp with time zone |           | not null |
 updated  | timestamp with time zone |           | not null |
 lang     | character varying(2)     |           | not null |
 q        | character varying(255)   |           | not null |
 hits     | integer                  |           | not null |
 count    | integer                  |           | not null |
 ip_list  | text                     |           | not null |
 locked   | boolean                  |           | not null |
 ts_list  | text                     |           | not null |
 ts_count | integer                  |           | not null |
Indexes:
    "photos_searchlog_pkey" PRIMARY KEY, btree (id)
    "photos_searchlog_lang_q_key" UNIQUE CONSTRAINT, btree (lang, q)
    "photos_searchlog_count" btree (count)
    "photos_searchlog_created" btree (created)
    "photos_searchlog_ts_count" btree (ts_count)
    "photos_searchlog_updated" btree (updated)

It's only the statement ALTER TABLE ONLY photos_searchlog ADD CONSTRAINT 
photos_searchlog_lang_q_key UNIQUE (lang, q); which causes the delay. I use the 
default postgres configuration on the same hardware 
(/etc/postgresql/10/main/postgresql.conf). I tested different postgres 
versions, checked the locale and other settings but can not find any 
differences. I also tried with more or less data, but always the same result.

Does anybody have a clue what could cause the time difference?

Thanks

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