Question

我试图更新表格中包含大约1百万条记录的所有行中的列值。

前几次我运行了挂起的查询，20分钟后我取消了查询。我用EXPLAIN ANALYZE再次运行它，40分钟后输出：

=# explain analyze update documents set state = 'archived';
NOTICE:  word is too long to be indexed
DETAIL:  Words longer than 2047 characters are ignored.
ERROR:  deadlock detected
DETAIL:  Process 17080 waits for ShareLock on transaction 14275765; blocked by process 1530.
Process 1530 waits for ShareLock on transaction 14273749; blocked by process 17080.
HINT:  See server log for query details.
Time: 2324900.382 ms

这里是EXPLAIN输出：

=# explain update documents set workflow_state = 'archived';
                                 QUERY PLAN
----------------------------------------------------------------------------
 Update on documents  (cost=0.00..220673.50 rows=900750 width=1586)
   ->  Seq Scan on documents  (cost=0.00..220673.50 rows=900750 width=1586)

知道发生了什么事吗？

详细说明：

PG version 9.3.7

Indexes:
    "documents_pkey" PRIMARY KEY, btree (id)
    "document_search_ix" gin (contents_search)
    "document_user_id_recvd_ix" btree (user_id, bill_date DESC)
Foreign-key constraints:
    "documents_biller_id_fkey" FOREIGN KEY (biller_id) REFERENCES billers(id) ON DELETE SET DEFAULT
    "documents_billercred_id_fkey" FOREIGN KEY (billercred_id) REFERENCES billercreds(id) ON DELETE SET NULL
    "documents_folder_id_fkey" FOREIGN KEY (folder_id) REFERENCES folders(id) ON DELETE CASCADE
    "documents_user_id_fkey" FOREIGN KEY (user_id) REFERENCES users(id) ON DELETE CASCADE
    "documents_vendor_id_fkey" FOREIGN KEY (vendor_id) REFERENCES vendors(id) ON DELETE SET NULL
Referenced by:
    TABLE "document_billcom_actions" CONSTRAINT "document_billcom_actions_document_id_fkey" FOREIGN KEY (document_id) REFERENCES documents(id) ON DELETE CASCADE
    TABLE "document_box_actions" CONSTRAINT "document_box_actions_document_id_fkey" FOREIGN KEY (document_id) REFERENCES documents(id) ON DELETE CASCADE
    TABLE "document_email_forwarding_actions" CONSTRAINT "document_email_forwarding_actions_document_id_fkey" FOREIGN KEY (document_id) REFERENCES documents(id) ON DELETE CASCADE
    TABLE "document_qbo_actions" CONSTRAINT "document_qbo_actions_document_id_fkey" FOREIGN KEY (document_id) REFERENCES documents(id) ON DELETE CASCADE
    TABLE "document_xero_actions" CONSTRAINT "document_xero_actions_document_id_fkey" FOREIGN KEY (document_id) REFERENCES documents(id) ON DELETE CASCADE
    TABLE "document_xerofiles_actions" CONSTRAINT "document_xerofiles_actions_document_id_fkey" FOREIGN KEY (document_id) REFERENCES documents(id) ON DELETE CASCADE
    TABLE "documenttagmap" CONSTRAINT "documenttagmap_document_id_fkey" FOREIGN KEY (document_id) REFERENCES documents(id) ON DELETE CASCADE
    TABLE "synced_docs" CONSTRAINT "synced_docs_doc_id_fkey" FOREIGN KEY (doc_id) REFERENCES documents(id) ON DELETE CASCADE
Triggers:
    document_search_update BEFORE INSERT OR UPDATE ON documents FOR EACH ROW EXECUTE PROCEDURE tsvector_update_trigger('contents_search', 'pg_catalog.english', 'contents', 'filename', 'account_name', 'account_number')
    document_updated_at_t BEFORE UPDATE ON documents FOR EACH ROW EXECUTE PROCEDURE update_updated_at_column()
    documents_count BEFORE INSERT OR DELETE ON documents FOR EACH ROW EXECUTE PROCEDURE count_trig()
    folder_document_count_trig BEFORE INSERT OR DELETE OR UPDATE ON documents FOR EACH ROW EXECUTE PROCEDURE update_folder_count()
    tags_in_trash_document_count_trig BEFORE DELETE OR UPDATE ON documents FOR EACH ROW EXECUTE PROCEDURE update_tag_trash_count()

Postgres表更新耗时40分钟，最终失败

0 个答案: