@Query(value = "select 'alter table ' || a.table_name || ' allocate extent' from user_tables a where a.table_name not in (select segment_name from user_segments where segment_type = 'TABLE')", nativeQuery = true)
 List<String> findTables();

　　　　　　　　List<String> list = versionDao.findTables();
                if (!list.isEmpty() && list != null) {
                    for (String str : list) {
　　　　　　　　　　　　　　 //Str ： alter table RECORD allocate extent，截取RECORD
                        String reg = "alter table (.*?) allocate extent";
                        Pattern compile = Pattern.compile(reg);
                        Matcher matcher = compile.matcher(str);
                        while (matcher.find()) {
                            String sql = "alter table " + matcher.group(1) + " allocate extent";
                            Query query = entityManager.createNativeQuery(sql);
                            query.executeUpdate();
                        }
                    }
                }