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Java 为什么Oraoop 1.6在分配内存块之前要等待1.5分钟?_Java_Oracle_Oracle11g_Sqoop_Hortonworks Data Platform - Fatal编程技术网

Java 为什么Oraoop 1.6在分配内存块之前要等待1.5分钟?

Java 为什么Oraoop 1.6在分配内存块之前要等待1.5分钟?,java,oracle,oracle11g,sqoop,hortonworks-data-platform,Java,Oracle,Oracle11g,Sqoop,Hortonworks Data Platform,使用sqoop1.4.4和oraoop1.6,不管表的行/列计数如何,我们总是有1.5分钟以上的等待时间。使用--verbose不会显示更多信息。SQOOP命令未重写任何-D变量 以下是命令的输出: 15/01/14 02:08:13 INFO oraoop.OracleConnectionFactory: Initializing Oracle session with SQL : alter session set tracefile_identifier=oraoop 15/01/14 0

使用sqoop1.4.4和oraoop1.6,不管表的行/列计数如何,我们总是有1.5分钟以上的等待时间。使用
--verbose
不会显示更多信息。
SQOOP
命令未重写任何-D变量

以下是命令的输出:

15/01/14 02:08:13 INFO oraoop.OracleConnectionFactory: Initializing Oracle session with SQL : alter session set tracefile_identifier=oraoop
15/01/14 02:09:48 INFO oraoop.OraOopDataDrivenDBInputFormat: The table being imported by sqoop has 320 blocks that have been divided into 5 chunks which will be processed in 5 splits. The chunks will be allocated to the splits using the method : ROUNDROBIN
我们发现此查询占用了大部分或全部时间:

 SELECT   data_object_id, file_id, relative_fno, file_batch,
         MIN (start_block_id) start_block_id, MAX (end_block_id) end_block_id,
         SUM (blocks) blocks
    FROM (SELECT o.data_object_id, e.file_id, e.relative_fno,
                 e.block_id start_block_id,
                 e.block_id + e.blocks - 1 end_block_id, e.blocks,
                 CEIL
                    (  SUM (e.blocks) OVER (PARTITION BY o.data_object_id, e.file_id ORDER BY e.block_id ASC)
                     / (  SUM (e.blocks) OVER (PARTITION BY o.data_object_id, e.file_id)
                        / :numchunks
                       )
                    ) file_batch
            FROM dba_extents e, dba_objects o, dba_tab_subpartitions tsp
           WHERE o.owner = :owner
             AND o.object_name = :object_name
             AND e.owner = :owner
             AND e.segment_name = :object_name
             AND o.owner = e.owner
             AND o.object_name = e.segment_name
             AND (   o.subobject_name = e.partition_name
                  OR (o.subobject_name IS NULL AND e.partition_name IS NULL)
                 )
             AND o.owner = tsp.table_owner(+)
             AND o.object_name = tsp.table_name(+)
             AND o.subobject_name = tsp.subpartition_name(+))
GROUP BY data_object_id, file_id, relative_fno, file_batch
ORDER BY data_object_id, file_id, relative_fno, file_batch
计划如下:

----------------------------------------------------------------------------------------------------------------------------
| Id  | Operation                                      | Name                      | Rows  | Bytes | Cost (%CPU)| Time     |
----------------------------------------------------------------------------------------------------------------------------
|   0 | SELECT STATEMENT                               |                           |       |       |  2383 (100)|          |
|   1 |  SORT GROUP BY                                 |                           |     3 |   246 |  2383   (2)| 00:00:34 |
|   2 |   VIEW                                         |                           |     3 |   246 |  2382   (2)| 00:00:34 |
|   3 |    WINDOW SORT                                 |                           |     3 |   804 |  2382   (2)| 00:00:34 |
|*  4 |     FILTER                                     |                           |       |       |            |          |
|*  5 |      HASH JOIN                                 |                           |     3 |   804 |  2381   (2)| 00:00:34 |
|*  6 |       HASH JOIN OUTER                          |                           |     2 |   298 |    53   (2)| 00:00:01 |
|   7 |        VIEW                                    | DBA_OBJECTS               |     2 |   226 |     6   (0)| 00:00:01 |
|   8 |         UNION-ALL                              |                           |       |       |            |          |
|*  9 |          FILTER                                |                           |       |       |            |          |
|* 10 |           FILTER                               |                           |       |       |            |          |
|  11 |            NESTED LOOPS                        |                           |     1 |    86 |     5   (0)| 00:00:01 |
|  12 |             NESTED LOOPS                       |                           |     1 |    64 |     4   (0)| 00:00:01 |
|  13 |              TABLE ACCESS BY INDEX ROWID       | USER$                     |     1 |    15 |     1   (0)| 00:00:01 |
|* 14 |               INDEX UNIQUE SCAN                | I_USER1                   |     1 |       |     0   (0)|          |
|* 15 |              TABLE ACCESS BY INDEX ROWID       | OBJ$                      |     1 |    49 |     3   (0)| 00:00:01 |
|* 16 |               INDEX RANGE SCAN                 | I_OBJ5                    |     1 |       |     2   (0)| 00:00:01 |
|* 17 |             INDEX RANGE SCAN                   | I_USER2                   |     1 |    22 |     1   (0)| 00:00:01 |
|  18 |           NESTED LOOPS                         |                           |     1 |    30 |     2   (0)| 00:00:01 |
|* 19 |            INDEX SKIP SCAN                     | I_USER2                   |     1 |    20 |     1   (0)| 00:00:01 |
|* 20 |            INDEX RANGE SCAN                    | I_OBJ4                    |     1 |    10 |     1   (0)| 00:00:01 |
|* 21 |          FILTER                                |                           |       |       |            |          |
|  22 |           NESTED LOOPS                         |                           |     1 |    45 |     1   (0)| 00:00:01 |
|  23 |            TABLE ACCESS BY INDEX ROWID         | USER$                     |     1 |    15 |     1   (0)| 00:00:01 |
|* 24 |             INDEX UNIQUE SCAN                  | I_USER1                   |     1 |       |     0   (0)|          |
|* 25 |            INDEX RANGE SCAN                    | I_LINK1                   |     1 |    30 |     0   (0)|          |
|  26 |        VIEW                                    | DBA_TAB_SUBPARTITIONS     |     9 |   324 |    47   (3)| 00:00:01 |
|* 27 |         FILTER                                 |                           |       |       |            |          |
|  28 |          NESTED LOOPS OUTER                    |                           |     9 |  1215 |    47   (3)| 00:00:01 |
|  29 |           NESTED LOOPS                         |                           |     8 |   984 |    39   (3)| 00:00:01 |
|  30 |            NESTED LOOPS                        |                           |     8 |   912 |    31   (4)| 00:00:01 |
|  31 |             NESTED LOOPS                       |                           |     8 |   888 |    23   (5)| 00:00:01 |
|  32 |              NESTED LOOPS OUTER                |                           |     8 |   776 |     7  (15)| 00:00:01 |
|* 33 |               HASH JOIN                        |                           |     8 |   728 |     7  (15)| 00:00:01 |
|  34 |                NESTED LOOPS                    |                           |       |       |            |          |
|  35 |                 NESTED LOOPS                   |                           |     8 |   632 |     4   (0)| 00:00:01 |
|  36 |                  NESTED LOOPS                  |                           |     1 |    54 |     2   (0)| 00:00:01 |
|  37 |                   TABLE ACCESS BY INDEX ROWID  | USER$                     |     1 |    15 |     1   (0)| 00:00:01 |
|* 38 |                    INDEX UNIQUE SCAN           | I_USER1                   |     1 |       |     0   (0)|          |
|* 39 |                   INDEX RANGE SCAN             | I_OBJ2                    |     1 |    39 |     1   (0)| 00:00:01 |
|* 40 |                  INDEX RANGE SCAN              | I_TABSUBPART_POBJSUBPART$ |    11 |       |     1   (0)| 00:00:01 |
|  41 |                 TABLE ACCESS BY INDEX ROWID    | TABSUBPART$               |    11 |   275 |     2   (0)| 00:00:01 |
|  42 |                TABLE ACCESS FULL               | TABCOMPART$               |    61 |   732 |     2   (0)| 00:00:01 |
|* 43 |               INDEX UNIQUE SCAN                | I_DEFERRED_STG1           |     1 |     6 |     0   (0)|          |
|* 44 |              TABLE ACCESS BY INDEX ROWID       | OBJ$                      |     1 |    14 |     2   (0)| 00:00:01 |
|* 45 |               INDEX RANGE SCAN                 | I_OBJ1                    |     1 |       |     1   (0)| 00:00:01 |
|  46 |             TABLE ACCESS CLUSTER               | TS$                       |     1 |     3 |     1   (0)| 00:00:01 |
|* 47 |              INDEX UNIQUE SCAN                 | I_TS#                     |     1 |       |     0   (0)|          |
|* 48 |            TABLE ACCESS CLUSTER                | TAB$                      |     1 |     9 |     1   (0)| 00:00:01 |
|* 49 |             INDEX UNIQUE SCAN                  | I_OBJ#                    |     1 |       |     0   (0)|          |
|  50 |           TABLE ACCESS CLUSTER                 | SEG$                      |     1 |    12 |     1   (0)| 00:00:01 |
|* 51 |            INDEX UNIQUE SCAN                   | I_FILE#_BLOCK#            |     1 |       |     0   (0)|          |
|  52 |       VIEW                                     | DBA_EXTENTS               |   140 | 16660 |  2328   (2)| 00:00:33 |
|  53 |        UNION-ALL                               |                           |       |       |            |          |
|* 54 |         FILTER                                 |                           |       |       |            |          |
|  55 |          NESTED LOOPS                          |                           |     1 |   177 |   896   (0)| 00:00:13 |
|  56 |           NESTED LOOPS                         |                           |     1 |    89 |    28   (0)| 00:00:01 |
|  57 |            TABLE ACCESS FULL                   | UET$                      |     1 |    78 |    28   (0)| 00:00:01 |
|  58 |            TABLE ACCESS BY INDEX ROWID         | FILE$                     |     1 |    11 |     0   (0)|          |
|* 59 |             INDEX UNIQUE SCAN                  | I_FILE2                   |     1 |       |     0   (0)|          |
|  60 |           VIEW                                 | SYS_DBA_SEGS              |     1 |    88 |   868   (0)| 00:00:13 |
|  61 |            UNION ALL PUSHED PREDICATE          |                           |       |       |            |          |
|* 62 |             FILTER                             |                           |       |       |            |          |
|  63 |              NESTED LOOPS                      |                           |     1 |    99 |   860   (0)| 00:00:13 |
|* 64 |               FILTER                           |                           |       |       |            |          |
|  65 |                NESTED LOOPS OUTER              |                           |     1 |    84 |   844   (0)| 00:00:12 |
|  66 |                 MERGE JOIN CARTESIAN           |                           |     1 |    69 |   843   (0)| 00:00:12 |
|  67 |                  NESTED LOOPS                  |                           |     1 |    31 |     2   (0)| 00:00:01 |
|  68 |                   NESTED LOOPS                 |                           |     1 |    10 |     1   (0)| 00:00:01 |
|* 69 |                    INDEX UNIQUE SCAN           | I_FILE2                   |     1 |     7 |     0   (0)|          |
|  70 |                    TABLE ACCESS CLUSTER        | TS$                       |     1 |     3 |     1   (0)| 00:00:01 |
|* 71 |                     INDEX UNIQUE SCAN          | I_TS#                     |     1 |       |     0   (0)|          |
|* 72 |                   TABLE ACCESS CLUSTER         | SEG$                      |     1 |    21 |     1   (0)| 00:00:01 |
|* 73 |                    INDEX UNIQUE SCAN           | I_FILE#_BLOCK#            |     1 |       |     0   (0)|          |
|  74 |                  BUFFER SORT                   |                           |     3 |   114 |   842   (0)| 00:00:12 |
|* 75 |                   INDEX SKIP SCAN              | I_OBJ5                    |     3 |   114 |   841   (0)| 00:00:12 |
|  76 |                 TABLE ACCESS CLUSTER           | USER$                     |     1 |    15 |     1   (0)| 00:00:01 |
|* 77 |                  INDEX UNIQUE SCAN             | I_USER#                   |     1 |       |     0   (0)|          |
|* 78 |               VIEW                             | SYS_OBJECTS               |     3 |    45 |    16   (0)| 00:00:01 |
|  79 |                UNION ALL PUSHED PREDICATE      |                           |       |       |            |          |
|* 80 |                 TABLE ACCESS CLUSTER           | TAB$                      |     1 |    25 |     2   (0)| 00:00:01 |
|* 81 |                  INDEX UNIQUE SCAN             | I_OBJ#                    |     1 |       |     1   (0)| 00:00:01 |
|* 82 |                 TABLE ACCESS BY INDEX ROWID    | TABPART$                  |     1 |    18 |     2   (0)| 00:00:01 |
|* 83 |                  INDEX UNIQUE SCAN             | I_TABPART_OBJ$            |     1 |       |     1   (0)| 00:00:01 |
|* 84 |                 TABLE ACCESS CLUSTER           | CLU$                      |     1 |    14 |     2   (0)| 00:00:01 |
|* 85 |                  INDEX UNIQUE SCAN             | I_OBJ#                    |     1 |       |     1   (0)| 00:00:01 |
|* 86 |                 TABLE ACCESS BY INDEX ROWID    | IND$                      |     1 |    21 |     2   (0)| 00:00:01 |
|* 87 |                  INDEX UNIQUE SCAN             | I_IND1                    |     1 |       |     1   (0)| 00:00:01 |
|* 88 |                 TABLE ACCESS BY INDEX ROWID    | INDPART$                  |     1 |    18 |     2   (0)| 00:00:01 |
|* 89 |                  INDEX UNIQUE SCAN             | I_INDPART_OBJ$            |     1 |       |     1   (0)| 00:00:01 |
|* 90 |                 TABLE ACCESS BY INDEX ROWID    | LOB$                      |     1 |    20 |     2   (0)| 00:00:01 |
|* 91 |                  INDEX UNIQUE SCAN             | I_LOB2                    |     1 |       |     1   (0)| 00:00:01 |
|* 92 |                 TABLE ACCESS BY INDEX ROWID    | TABSUBPART$               |     1 |    19 |     1   (0)| 00:00:01 |
|* 93 |                  INDEX UNIQUE SCAN             | I_TABSUBPART$_OBJ$        |     1 |       |     0   (0)|          |
|* 94 |                 TABLE ACCESS BY INDEX ROWID    | INDSUBPART$               |     1 |    19 |     2   (0)| 00:00:01 |
|* 95 |                  INDEX UNIQUE SCAN             | I_INDSUBPART_OBJ$         |     1 |       |     1   (0)| 00:00:01 |
|* 96 |                 TABLE ACCESS BY INDEX ROWID    | LOBFRAG$                  |     1 |    16 |     1   (0)| 00:00:01 |
|* 97 |                  INDEX UNIQUE SCAN             | I_LOBFRAG$_FRAGOBJ$       |     1 |       |     0   (0)|          |
|* 98 |             FILTER                             |                           |       |       |            |          |
|* 99 |              FILTER                            |                           |       |       |            |          |
| 100 |               NESTED LOOPS OUTER               |                           |     1 |    77 |     4   (0)| 00:00:01 |
| 101 |                NESTED LOOPS                    |                           |     1 |    62 |     3   (0)| 00:00:01 |
| 102 |                 NESTED LOOPS                   |                           |     1 |    37 |     2   (0)| 00:00:01 |
| 103 |                  NESTED LOOPS                  |                           |     1 |    10 |     1   (0)| 00:00:01 |
|*104 |                   INDEX UNIQUE SCAN            | I_FILE2                   |     1 |     7 |     0   (0)|          |
| 105 |                   TABLE ACCESS CLUSTER         | TS$                       |     1 |     3 |     1   (0)| 00:00:01 |
|*106 |                    INDEX UNIQUE SCAN           | I_TS#                     |     1 |       |     0   (0)|          |
|*107 |                  TABLE ACCESS BY INDEX ROWID   | UNDO$                     |     1 |    27 |     1   (0)| 00:00:01 |
|*108 |                   INDEX RANGE SCAN             | I_UNDO2                   |     1 |       |     0   (0)|          |
|*109 |                 TABLE ACCESS CLUSTER           | SEG$                      |     1 |    25 |     1   (0)| 00:00:01 |
|*110 |                  INDEX UNIQUE SCAN             | I_FILE#_BLOCK#            |     1 |       |     0   (0)|          |
| 111 |                TABLE ACCESS CLUSTER            | USER$                     |     1 |    15 |     1   (0)| 00:00:01 |
|*112 |                 INDEX UNIQUE SCAN              | I_USER#                   |     1 |       |     0   (0)|          |
|*113 |             FILTER                             |                           |       |       |            |          |
|*114 |              FILTER                            |                           |       |       |            |          |
| 115 |               NESTED LOOPS OUTER               |                           |     1 |    54 |     4   (0)| 00:00:01 |
| 116 |                NESTED LOOPS                    |                           |     1 |    39 |     3   (0)| 00:00:01 |
| 117 |                 NESTED LOOPS                   |                           |     1 |    14 |     2   (0)| 00:00:01 |
| 118 |                  TABLE ACCESS BY INDEX ROWID   | FILE$                     |     1 |    11 |     1   (0)| 00:00:01 |
|*119 |                   INDEX UNIQUE SCAN            | I_FILE2                   |     1 |       |     0   (0)|          |
| 120 |                  TABLE ACCESS CLUSTER          | TS$                       |     1 |     3 |     1   (0)| 00:00:01 |
|*121 |                   INDEX UNIQUE SCAN            | I_TS#                     |     1 |       |     0   (0)|          |
|*122 |                 TABLE ACCESS CLUSTER           | SEG$                      |     1 |    25 |     1   (0)| 00:00:01 |
|*123 |                  INDEX UNIQUE SCAN             | I_FILE#_BLOCK#            |     1 |       |     0   (0)|          |
| 124 |                TABLE ACCESS CLUSTER            | USER$                     |     1 |    15 |     1   (0)| 00:00:01 |
|*125 |                 INDEX UNIQUE SCAN              | I_USER#                   |     1 |       |     0   (0)|          |
|*126 |         FILTER                                 |                           |       |       |            |          |
|*127 |          HASH JOIN                             |                           |   139 | 24603 |  1431   (2)| 00:00:21 |
|*128 |           HASH JOIN                            |                           |   238 | 23562 |  1406   (1)| 00:00:20 |
| 129 |            VIEW                                | SYS_DBA_SEGS              |    37 |  3256 |  1403   (0)| 00:00:20 |
| 130 |             UNION-ALL                          |                           |       |       |            |          |
|*131 |              FILTER                            |                           |       |       |            |          |
| 132 |               NESTED LOOPS                     |                           |    35 |  3465 |  1015   (1)| 00:00:15 |
| 133 |                NESTED LOOPS                    |                           |    35 |  3360 |   979   (0)| 00:00:14 |
| 134 |                 NESTED LOOPS                   |                           |    35 |  3115 |   979   (0)| 00:00:14 |
| 135 |                  NESTED LOOPS                  |                           |   119 |  8092 |   860   (0)| 00:00:13 |
|*136 |                   FILTER                       |                           |       |       |            |          |
| 137 |                    NESTED LOOPS OUTER          |                           |     1 |    53 |   844   (0)| 00:00:12 |
|*138 |                     INDEX SKIP SCAN            | I_OBJ5                    |     3 |   114 |   841   (0)| 00:00:12 |
| 139 |                     TABLE ACCESS CLUSTER       | USER$                     |     1 |    15 |     1   (0)| 00:00:01 |
|*140 |                      INDEX UNIQUE SCAN         | I_USER#                   |     1 |       |     0   (0)|          |
|*141 |                   VIEW                         | SYS_OBJECTS               |     3 |    45 |    16   (0)| 00:00:01 |
| 142 |                    UNION ALL PUSHED PREDICATE  |                           |       |       |            |          |
|*143 |                     TABLE ACCESS CLUSTER       | TAB$                      |     1 |    25 |     2   (0)| 00:00:01 |
|*144 |                      INDEX UNIQUE SCAN         | I_OBJ#                    |     1 |       |     1   (0)| 00:00:01 |
| 145 |                     TABLE ACCESS BY INDEX ROWID| TABPART$                  |     1 |    18 |     2   (0)| 00:00:01 |
|*146 |                      INDEX UNIQUE SCAN         | I_TABPART_OBJ$            |     1 |       |     1   (0)| 00:00:01 |
| 147 |                     TABLE ACCESS CLUSTER       | CLU$                      |     1 |    14 |     2   (0)| 00:00:01 |
|*148 |                      INDEX UNIQUE SCAN         | I_OBJ#                    |     1 |       |     1   (0)| 00:00:01 |
|*149 |                     TABLE ACCESS BY INDEX ROWID| IND$                      |     1 |    21 |     2   (0)| 00:00:01 |
|*150 |                      INDEX UNIQUE SCAN         | I_IND1                    |     1 |       |     1   (0)| 00:00:01 |
| 151 |                     TABLE ACCESS BY INDEX ROWID| INDPART$                  |     1 |    18 |     2   (0)| 00:00:01 |
|*152 |                      INDEX UNIQUE SCAN         | I_INDPART_OBJ$            |     1 |       |     1   (0)| 00:00:01 |
|*153 |                     TABLE ACCESS BY INDEX ROWID| LOB$                      |     1 |    20 |     2   (0)| 00:00:01 |
|*154 |                      INDEX UNIQUE SCAN         | I_LOB2                    |     1 |       |     1   (0)| 00:00:01 |
| 155 |                     TABLE ACCESS BY INDEX ROWID| TABSUBPART$               |     1 |    19 |     1   (0)| 00:00:01 |
|*156 |                      INDEX UNIQUE SCAN         | I_TABSUBPART$_OBJ$        |     1 |       |     0   (0)|          |
| 157 |                     TABLE ACCESS BY INDEX ROWID| INDSUBPART$               |     1 |    19 |     2   (0)| 00:00:01 |
|*158 |                      INDEX UNIQUE SCAN         | I_INDSUBPART_OBJ$         |     1 |       |     1   (0)| 00:00:01 |
| 159 |                     TABLE ACCESS BY INDEX ROWID| LOBFRAG$                  |     1 |    16 |     1   (0)| 00:00:01 |
|*160 |                      INDEX UNIQUE SCAN         | I_LOBFRAG$_FRAGOBJ$       |     1 |       |     0   (0)|          |
|*161 |                  TABLE ACCESS CLUSTER          | SEG$                      |     1 |    21 |     1   (0)| 00:00:01 |
|*162 |                   INDEX UNIQUE SCAN            | I_FILE#_BLOCK#            |     1 |       |     0   (0)|          |
|*163 |                 INDEX UNIQUE SCAN              | I_FILE2                   |     1 |     7 |     0   (0)|          |
| 164 |                TABLE ACCESS CLUSTER            | TS$                       |     1 |     3 |     1   (0)| 00:00:01 |
|*165 |                 INDEX UNIQUE SCAN              | I_TS#                     |     1 |       |     0   (0)|          |
|*166 |              FILTER                            |                           |       |       |            |          |
|*167 |               FILTER                           |                           |       |       |            |          |
| 168 |                NESTED LOOPS OUTER              |                           |     1 |    77 |     5   (0)| 00:00:01 |
| 169 |                 NESTED LOOPS                   |                           |     1 |    62 |     4   (0)| 00:00:01 |
| 170 |                  NESTED LOOPS                  |                           |     1 |    59 |     3   (0)| 00:00:01 |
| 171 |                   NESTED LOOPS                 |                           |     1 |    34 |     2   (0)| 00:00:01 |
|*172 |                    TABLE ACCESS BY INDEX ROWID | UNDO$                     |     1 |    27 |     2   (0)| 00:00:01 |
|*173 |                     INDEX RANGE SCAN           | I_UNDO2                   |     1 |       |     1   (0)| 00:00:01 |
|*174 |                    INDEX UNIQUE SCAN           | I_FILE2                   |     1 |     7 |     0   (0)|          |
|*175 |                   TABLE ACCESS CLUSTER         | SEG$                      |     1 |    25 |     1   (0)| 00:00:01 |
|*176 |                    INDEX UNIQUE SCAN           | I_FILE#_BLOCK#            |     1 |       |     0   (0)|          |
| 177 |                  TABLE ACCESS CLUSTER          | TS$                       |     1 |     3 |     1   (0)| 00:00:01 |
|*178 |                   INDEX UNIQUE SCAN            | I_TS#                     |     1 |       |     0   (0)|          |
| 179 |                 TABLE ACCESS CLUSTER           | USER$                     |     1 |    15 |     1   (0)| 00:00:01 |
|*180 |                  INDEX UNIQUE SCAN             | I_USER#                   |     1 |       |     0   (0)|          |
|*181 |              FILTER                            |                           |       |       |            |          |
|*182 |               FILTER                           |                           |       |       |            |          |
| 183 |                NESTED LOOPS OUTER              |                           |     1 |    54 |   384   (0)| 00:00:06 |
| 184 |                 NESTED LOOPS                   |                           |     1 |    39 |   383   (0)| 00:00:06 |
| 185 |                  NESTED LOOPS                  |                           |     1 |    36 |   382   (0)| 00:00:06 |
| 186 |                   TABLE ACCESS FULL            | FILE$                     |   290 |  3190 |     2   (0)| 00:00:01 |
|*187 |                   TABLE ACCESS CLUSTER         | SEG$                      |     1 |    25 |     2   (0)| 00:00:01 |
|*188 |                    INDEX RANGE SCAN            | I_FILE#_BLOCK#            |     1 |       |     1   (0)| 00:00:01 |
| 189 |                  TABLE ACCESS CLUSTER          | TS$                       |     1 |     3 |     1   (0)| 00:00:01 |
|*190 |                   INDEX UNIQUE SCAN            | I_TS#                     |     1 |       |     0   (0)|          |
| 191 |                 TABLE ACCESS CLUSTER           | USER$                     |     1 |    15 |     1   (0)| 00:00:01 |
|*192 |                  INDEX UNIQUE SCAN             | I_USER#                   |     1 |       |     0   (0)|          |
| 193 |            TABLE ACCESS FULL                   | FILE$                     |   290 |  3190 |     2   (0)| 00:00:01 |
| 194 |           FIXED TABLE FULL                     | X$KTFBUE                  |   100K|  7617K|    24 (100)| 00:00:01 |
----------------------------------------------------------------------------------------------------------------------------

有没有办法调整或覆盖此查询?是否有其他方法可以提高此命令的速度?

确保您拥有相关表的最新优化器统计信息。在解释计划中有许多“行=1”通常是一个糟糕计划的标志。运行以下两条语句以收集统计信息:

begin
    dbms_stats.gather_dictionary_stats;
    dbms_stats.gather_fixed_objects_stats;
end;
/
如果这解决了问题,请与DBA合作,确保至少定期运行
gather\u dictionary\u stats
(默认情况下应该如此)


如果可能,修改SQOOP以删除这些冗余谓词可能会有所帮助:

AND o.owner = e.owner
AND o.object_name = e.segment_name
在我的数据库中,删除这两个条件大大改变了计划

declare
    v_task_name varchar2(30);
begin
    v_task_name := dbms_sqltune.create_tuning_task(sql_id => 'f9nqqh167x884');
    dbms_sqltune.execute_tuning_task(task_name=> v_task_name);
    dbms_output.put_line('Task Name: '||v_task_name);
end;
/

select dbms_sqltune.report_tuning_task('TASK_609') from dual;

如果统计信息没有帮助,并且您无法修改查询,请尝试使用SQL Tuning Advisor来推荐修复计划的方法

declare
    v_task_name varchar2(30);
begin
    v_task_name := dbms_sqltune.create_tuning_task(sql_id => 'f9nqqh167x884');
    dbms_sqltune.execute_tuning_task(task_name=> v_task_name);
    dbms_output.put_line('Task Name: '||v_task_name);
end;
/

select dbms_sqltune.report_tuning_task('TASK_609') from dual;
在我的系统上,它建议创建一个配置文件。配置文件为优化器提供了很多有用的信息,比如,“此连接返回的行数比估计的多200%”


我不知道如何在不获得补丁的情况下修改查询-如果我弄错了,有人能纠正我吗?而且,它已经使用了绑定变量。收集统计数据有帮助吗?在你开始打乱执行计划之前,你肯定想先试试。此外,如果它使用绑定变量,您可以将其发布到计划中吗?它是否使用类似于
:owner
的内容而不是
“FOO”