{"id":3583,"date":"2020-10-11T16:36:56","date_gmt":"2020-10-11T16:36:56","guid":{"rendered":"https:\/\/nenadnoveljic.com\/blog\/?p=3583"},"modified":"2022-09-29T15:04:06","modified_gmt":"2022-09-29T15:04:06","slug":"ora-07445-in-qksqbcheckprop-with-inline-hint","status":"publish","type":"post","link":"https:\/\/nenadnoveljic.com\/blog\/ora-07445-in-qksqbcheckprop-with-inline-hint\/","title":{"rendered":"ORA-07445 in qksqbCheckProp() with Inline Hint"},"content":{"rendered":"

The following test case produces ORA-07445 in Oracle 18c and 19c:<\/p>\n

create table t1 (n1 number);\ncreate table t2 (n2 number);\ncreate table t3 (n3 number);\ncreate table t4 (n4 number);\n\nset pagesize 200\nset linesize 200\n\nwith\n  cte1 as ( \n    select \/*+ qb_name(qb_cte1) *\/ n1 from t1 join t2 on t1.n1 = t2.n2 \n  ),\n  cte2 as ( \n    select \/*+ qb_name(qb_cte2) inline<\/span> *\/ t3.n3  \n      from t3 left join cte1 on cte1.n1 = t3.n3 \n  ),\n  cte3 as (\n    select \/*+ qb_name(qb_cte3) *\/ t4.n4 \n      from t4 join cte2 on cte2.n3 = t4.n4\n  )\n  select \/*+ qb_name(qb_main) *\/ 1 \n    from cte3 cte3_1 join cte3 cte3_2 on cte3_1.n4 = cte3_2.n4 ;<\/code><\/pre>\n
The query completes after removing the inline<\/span><\/i> hint. In 12c, the hint doesn’t make any difference. That’s expected, because optimizer wouldn’t materialize qb_cte2<\/i> anyway, as it’s referenced only once (in qb_main<\/i>).<\/p>\n
The alternative syntax introduced in 18c [1]<\/a> doesn’t help:<\/p>\n
with\n  cte1 as ( \n    select \/*+ qb_name(qb_cte1) *\/ n1 from t1 join t2 on t1.n1 = t2.n2 \n  ),\n  cte2 as ( \n    select \/*+ qb_name(qb_cte2) *\/ t3.n3  \n      from t3 left join cte1 on cte1.n1 = t3.n3 \n  ),\n  cte3 as (\n    select \/*+ qb_name(qb_cte3) inline(@qb_cte2)<\/span> *\/ t4.n4 \n      from t4 join cte2 on cte2.n3 = t4.n4\n  )\n  select \/*+ qb_name(qb_main) *\/ 1 \n    from cte3 cte3_1 join cte3 cte3_2 on cte3_1.n4 = cte3_2.n4 ;<\/code><\/pre>\n
What’s different in 18c?<\/p>\n
Optimizer confused inline<\/i> with materialize<\/span><\/i> when transforming the query:<\/p>\n
CBQT: copy not possible on query block QB_CTE2<\/span> (#-1) because materialized<\/span> query block<\/code><\/pre>\n
Consequently, it preserved qb_cte2<\/i> as a unit:<\/p>\n
Final query after transformations:******* UNPARSED QUERY IS *******\nSELECT \/*+ QB_NAME (\"QB_MAIN\") *\/ 1 \"1\" FROM \"SYS\".\"T4\" \"T4\", (SELECT \/*+ QB_NAME (\"QB_CTE2\") *\/<\/span> \"T3\".\"N3\" \"N3\" FROM \"SYS\".\"T3\" \"T3\", (SELECT \/*+ QB_NAME (\"QB_CTE1\") *\/ \"T1\".\"N1\" \"N1\" FROM \"SYS\".\"T1\" \"T1\",\"SYS\".\"T2\" \"T2\" WHERE \"T1\".\"N1\"=\"T2\".\"N2\") \"CTE1\" WHERE \"CTE1\".\"N1\"(+)=\"T3\".\"N3\") \"CTE2\", (SELECT \/*+ QB_NAME (\"QB_CTE3\") *\/ \"T4\".\"N4\" \"N4\" FROM \"SYS\".\"T4\" \"T4\", (SELECT \/*+ QB_NAME (\"QB_CTE2\") *\/ \"T3\".\"N3\" \"N3\" FROM \"SYS\".\"T3\" \"T3\", (SELECT \/*+ QB_NAME (\"QB_CTE1\") *\/ \"T1\".\"N1\" \"N1\" FROM \"SYS\".\"T1\" \"T1\",\"SYS\".\"T2\" \"T2\" WHERE \"T1\".\"N1\"=\"T2\".\"N2\") \"CTE1\" WHERE \"CTE1\".\"N1\"(+)=\"T3\".\"N3\") \"CTE2\" WHERE \"CTE2\".\"N3\"=\"T4\".\"N4\") \"CTE3_2\" WHERE \"T4\".\"N4\"=\"CTE3_2\".\"N4\" AND \"CTE2\".\"N3\"=\"T4\".\"N4\"<\/code><\/pre>\n
Without the hint, qb_cte2<\/i> is taken apart:<\/p>\n
Final query after transformations:******* UNPARSED QUERY IS *******\nSELECT \/*+ QB_NAME (\"QB_MAIN\") *\/ 1 \"1\" FROM  (SELECT \/*+ QB_NAME (\"QB_CTE2\") QB_NAME (\"QB_CTE3\") *\/<\/span> \"T4\".\"N4\" \"N4\" FROM \"SYS\".\"T4\" \"T4\",\"SYS\".\"T3\" \"T3\", (SELECT \/*+ QB_NAME (\"QB_CTE1\") *\/ \"T1\".\"N1\" \"N1\" FROM \"SYS\".\"T1\" \"T1\",\"SYS\".\"T2\" \"T2\" WHERE \"T1\".\"N1\"=\"T2\".\"N2\") \"CTE1\" WHERE \"T3\".\"N3\"=\"T4\".\"N4\" AND \"CTE1\".\"N1\"(+)=\"T3\".\"N3\") \"CTE3_1\", (SELECT \/*+ QB_NAME (\"QB_CTE2\") QB_NAME (\"QB_CTE3\") *\/ \"T4\".\"N4\" \"N4\" FROM \"SYS\".\"T4\" \"T4\",\"SYS\".\"T3\" \"T3\", (SELECT \/*+ QB_NAME (\"QB_CTE1\") *\/ \"T1\".\"N1\" \"N1\" FROM \"SYS\".\"T1\" \"T1\",\"SYS\".\"T2\" \"T2\" WHERE \"T1\".\"N1\"=\"T2\".\"N2\") \"CTE1\" WHERE \"T3\".\"N3\"=\"T4\".\"N4\" AND \"CTE1\".\"N1\"(+)=\"T3\".\"N3\") \"CTE3_2\" WHERE \"CTE3_1\".\"N4\"=\"CTE3_2\".\"N4\"<\/code><\/pre>\n
The execution plan is the same as in 12c in this case:<\/p>\n
with\n  cte1 as ( \n    select \/*+ qb_name(qb_cte1) *\/ n1 from t1 join t2 on t1.n1 = t2.n2 \n  ),\n  cte2 as ( \n    select \/*+ qb_name(qb_cte2) *\/ t3.n3  \n      from t3 left join cte1 on cte1.n1 = t3.n3 \n  ),\n  cte3 as (\n    select \/*+ qb_name(qb_cte3) *\/ t4.n4 \n      from t4 join cte2 on cte2.n3 = t4.n4\n  )\n  select \/*+ qb_name(qb_main) *\/ 1 \n    from cte3 cte3_1 join cte3 cte3_2 on cte3_1.n4 = cte3_2.n4 ;\n\nselect * from table(dbms_xplan.display_cursor(null,null,'alias')) ; \n\nPlan hash value: 167971766\n\n-----------------------------------------------------------------------------------------------------------------------\n| Id  | Operation                                | Name                       | Rows  | Bytes | Cost (%CPU)| Time     |\n-----------------------------------------------------------------------------------------------------------------------\n|   0 | SELECT STATEMENT                         |                            |       |       |    13 (100)|          |\n|   1 |  TEMP TABLE TRANSFORMATION               |                            |       |       |            |          |\n|   2 |   LOAD AS SELECT (CURSOR DURATION MEMORY)| SYS_TEMP_0FD9D6E2A_1C8381D |       |       |            |          |\n|*  3 |    HASH JOIN OUTER                       |                            |     1 |    39 |     9  (12)| 00:00:01 |\n|*  4 |     HASH JOIN                            |                            |     1 |    26 |     4   (0)| 00:00:01 |\n|   5 |      TABLE ACCESS FULL                   | T4                         |     1 |    13 |     2   (0)| 00:00:01 |\n|   6 |      TABLE ACCESS FULL                   | T3                         |     1 |    13 |     2   (0)| 00:00:01 |\n|   7 |     VIEW                                 |                            |     1 |    13 |     4   (0)| 00:00:01 |\n|*  8 |      HASH JOIN                           |                            |     1 |    26 |     4   (0)| 00:00:01 |\n|   9 |       TABLE ACCESS FULL                  | T1                         |     1 |    13 |     2   (0)| 00:00:01 |\n|  10 |       TABLE ACCESS FULL                  | T2                         |     1 |    13 |     2   (0)| 00:00:01 |\n|* 11 |   HASH JOIN                              |                            |     1 |    26 |     4   (0)| 00:00:01 |\n|  12 |    VIEW                                  |                            |     1 |    13 |     2   (0)| 00:00:01 |\n|  13 |     TABLE ACCESS FULL                    | SYS_TEMP_0FD9D6E2A_1C8381D |     1 |    13 |     2   (0)| 00:00:01 |\n|  14 |    VIEW                                  |                            |     1 |    13 |     2   (0)| 00:00:01 |\n|  15 |     TABLE ACCESS FULL                    | SYS_TEMP_0FD9D6E2A_1C8381D |     1 |    13 |     2   (0)| 00:00:01 |\n-----------------------------------------------------------------------------------------------------------------------\n\nQuery Block Name \/ Object Alias (identified by operation id):\n-------------------------------------------------------------\n\n   1 - SEL$3C08296D\n   2 - SEL$AC27D75A\n   5 - SEL$AC27D75A \/ T4@SEL$1\n   6 - SEL$AC27D75A \/ T3@SEL$3\n   7 - SEL$395D0DB9 \/ CTE1@SEL$3\n   8 - SEL$395D0DB9\n   9 - SEL$395D0DB9 \/ T1@SEL$4\n  10 - SEL$395D0DB9 \/ T2@SEL$4\n  12 - SEL$95F3F249 \/ CTE3_1@SEL$2\n  13 - SEL$95F3F249 \/ T1@SEL$95F3F249\n  14 - SEL$95F3F24A \/ CTE3_2@SEL$2\n  15 - SEL$95F3F24A \/ T1@SEL$95F3F24A\n\nPredicate Information (identified by operation id):\n---------------------------------------------------\n\n   3 - access(\"CTE1\".\"N1\"=\"T3\".\"N3\")\n   4 - access(\"T3\".\"N3\"=\"T4\".\"N4\")\n   8 - access(\"T1\".\"N1\"=\"T2\".\"N2\")\n  11 - access(\"CTE3_1\".\"N4\"=\"CTE3_2\".\"N4\")<\/code><\/pre>\n
Only qb_cte3<\/i> was materialized, because it’s referenced twice in qb_main<\/i>.<\/p>\n
The segmentation fault (with the hint) occurs in the Oracle C function qksqbCheckProp()<\/span><\/i>, because the CPU register r14<\/span><\/i> contains an invalid address:<\/p>\n
ORA-07445: exception encountered: core dump [qksqbCheckProp()+154<\/span>] [SIGSEGV] [ADDR:0xD47A9DA] [PC:0xD47A9DA] [Address not mapped to object] []\n...\nException [type: SIGSEGV, Address not mapped to object] [ADDR:0xD47A9DA] [PC:0xD47A9DA, qksqbCheckProp()+154] [flags: 0x0, count: 1]\nRegisters:\n----------\n%rax: 0x0000000000000000 %rbx: 0x0000000000000005 %rcx: 0x0000000000000017\n%rdx: 0x0000000000000000 %rdi: 0x0001000000000001 %rsi: 0x00007fffbfff3948\n%rsp: 0x00007fffbfff3630 %rbp: 0x00007fffbfff3710  %r8: 0x00007fffbd8a9d20\n%r9:  0x0000000000000000 %r10: 0x00007fffbd8a76f8 %r11: 0x000000000d47a940\n%r12: 0x00007fffbdafe990 %r13: 0x00007fffbfff38e0 %r14: 0x0001000000000001<\/span>\n%r15: 0x0000000000000020 %rip: 0x000000000d47a9da %rfl: 0x0000000000010202\nStack info:\n----------\nss_sp: 0x00007fffbe000000 ss_size: 0x0000000002000000 ss_flags: 0\nSwap entries = 1\npath=swap, size=193273524224, free=193273524224, length=377487352\n\nDisass information\n  qksqbCheckProp()+132 (0xd47a9c4) test $0x800,%r15d\n  qksqbCheckProp()+139 (0xd47a9cb) jne 0xd47ad95\n  qksqbCheckProp()+145 (0xd47a9d1) test $0x20,%r15d\n  qksqbCheckProp()+152 (0xd47a9d8) je 0xd47aa07\n> qksqbCheckProp()+154<\/span> (0xd47a9da) mov 0xc0(%r14)<\/span>,%r8\n  qksqbCheckProp()+161 (0xd47a9e1) test %r8,%r8\n  qksqbCheckProp()+164 (0xd47a9e4) je 0xd47aa07\n  qksqbCheckProp()+166 (0xd47a9e6) cmpq $0,0x68(%r8)\n  qksqbCheckProp()+171 (0xd47a9eb) jne 0xd47ae78<\/code><\/pre>\n
qksqbCheckProp()<\/i> checks properties of a query block during the optimization.<\/p>\n
Here’s the stack where this function is called:<\/p>\n
----- Call Stack Trace -----\ncalling              call     entry                argument values in hex\nlocation             type     point                (? means dubious value)\n-------------------- -------- -------------------- ----------------------------\n...\nsigacthandler()+216  call     call_user_handler()  00000000B ? 7FFFBDAAFEF0 ?\n                                                   7FFFBDAAF100 ? 7FFFBDAAF100 ?\n                                                   7FFFBDA87830 ? 00764A8B0 ?\nqksqbCheckProp()<\/span>+15  signal   sigacthandler()      00000000B ? 7FFFBDAAFEF0 ?\n4                                                  7FFFBDAAF100 ?\nqksqbApplyToQbcLoc(  call     qksqbCheckProp()     1000000000001 ?\n)+989                                              7FFFBDAAFEF0 ? 7FFFBDAAF100 ?\n                                                   000000017 ? 7FFFBD8A9D20 ?\n                                                   000000000 ?\nqksqbApplyToQbcLoc(  call     qksqbApplyToQbcLoc(  1000000000001 ?\n)+1202                        )                    7FFFBFFF38E0 ? 7FFFBDAAF100 ?\n                                                   000000017 ? 7FFFBD8A9D20 ?\n                                                   000000000 ?\nqksqbApplyToQbcLoc(  call     qksqbApplyToQbcLoc(  7FFFBD7DFFE0 ? 7FFFBFFF38E0 ?\n)+816                         )                    7FFFBDAAF100 ? 000000017 ?\n                                                   7FFFBD8A9D20 ? 000000000 ?\nqksqbApplyToQbcLoc(  call     qksqbApplyToQbcLoc(  7FFFBD7ED768 ? 7FFFBFFF38E0 ?\n)+1250                        )                    7FFFBDAAF100 ? 000000017 ?\n                                                   7FFFBD8A9D20 ? 000000000 ?\nqksqbApplyToQbc()+5  call     qksqbApplyToQbcLoc(  7FFFBD777EE8 ? 7FFFBFFF38E0 ?\n6                             )                    7FFFBDAAF100 ? 000000017 ?\n                                                   7FFFBD8A9D20 ? 000000000 ?\nkkocfbMonitorTable(  call     qksqbApplyToQbc()    7FFFBD777EE8 ? 00D47A940 ?\n)+331                                              7FFFBFFF3948 ? 000000005 ?\n                                                   7FFFBD8A9D20 ? 000000000 ?\nkkoFroAddXplAnnotat  call     kkocfbMonitorTable(  0884772E0 ? 7FFFBD77A5D0 ?\nions()+2593                   )                    000000000 ? 000000005 ?\n                                                   7FFFBD8A9D20 ? 000000000 ?\nkkoUpdateFroAnn()+5  call     kkoFroAddXplAnnotat  7FFFBD77A5D0 ? 7FFFBD7FA298 ?\n978                           ions()               7FFFBD7FA9B8 ? 7FFFBD7FA838 ?\n                                                   7FFFBD8A9D20 ? 000000000 ?\nkkoipt()+5515        call     kkoUpdateFroAnn()    7FFFBD7FA298 ? 7FFFBD7FE068 ?\n                                                   000000001 ? 7FFFBD7DBD08 ?\n                                                   7FFFBFFF3E14 ? 7FFFBFFF3E40 ?\nkkoqbc()+5816        call     kkoipt()             7FFFBD7FA298 ? 7FFFBD7FE068 ?\n                                                   000000001 ? 000000000 ?\n                                                   7FFFBFFF3E14 ? 7FFFBFFF3E40 ?\napakkoqb()+163       call     kkoqbc()             7FFFBFFF6290 ? 7FFFBD7FE068 ?\n                                                   000000001 ? 000000000 ?\n                                                   7FFFBFFF3E14 ? 7FFFBFFF3E40 ?\napaqbdDescendents()  call     apakkoqb()           7FFFBFFF6290 ? 7FFFBD900A00 ?\n+540                                               0884772E0 ? 000000000 ?\n                                                   7FFFBFFF3E14 ? 7FFFBFFF3E40 ?\napaqbdDescendents()  call     apaqbdDescendents()  7FFFBFFF6290 ? 7FFFBD900A00 ?\n+985                                               0884772E0 ? 000000000 ?\n                                                   7FFFBFFF3E14 ? 7FFFBFFF3E40 ?\napadrv()+2549        call     apaqbdDescendents()  7FFFBFFF6290 ? 7FFFBD777EE8 ?\n                                                   0884772E0 ? 000000000 ?\n                                                   7FFFBFFF3E14 ? 7FFFBFFF3E40 ?\nopitca()+2610        call     apadrv()             0884772E0 ? 7FFFBD777EE8 ?\n                                                   0884772E0 ? 000000000 ?\n                                                   7FFFBFFF3E14 ? 7FFFBFFF3E40 ?\nkksFullTypeCheck()+  call     opitca()             7FFFBD87E0D8 ? 0884772E0 ?\n73                                                 7FFFBFFF8130 ? 000000000 ?\n                                                   7FFFBFFF3E14 ? 7FFFBFFF3E40 ?<\/code><\/pre>\n
In conclusion, ORA-07445 in qksqbCheckProp()<\/i> can be a consequence of inline<\/i> hint. A final confirmation is an optimizer trace entry showing that the block is materialized instead of inlined. It’s therefore a good practice to name query blocks with the qb_name()<\/i> hint, to easier identify them in a large trace file.<\/p>\n
You can manually embed the common table expression as a workaround, for example:<\/p>\n
with\ncte1 as (\n  select \/*+ qb_name(qb_cte1) *\/ n1 from t1 join t2 on t1.n1 = t2.n2\n),\ncte3 as (\n  select \/*+ qb_name(qb_cte3) *\/ t4.n4\n    from t4 join (\n      select \/*+ qb_name(qb_cte2) *\/ t3.n3\n        from t3 left join cte1 on cte1.n1 = t3.n3\n    ) cte2<\/span> on cte2.n3 = t4.n4\n)\nselect \/*+ qb_name(qb_main) *\/ 1\n  from cte3 cte3_1 join cte3 cte3_2 on cte3_1.n4 = cte3_2.n4 ;<\/code><\/pre>\n
Update September 2, 2021: Oracle 21c<\/h1>\n
The problem is fixed in 21c.<\/p>\n
References<\/h1>\n
[1]<\/a> Jonathan Lewis, Inline Hint.<\/i> October 9, 2020.<\/p>\n","protected":false},"excerpt":{"rendered":"
Inline hint can cause ORA-07445 in 18c and 19c. 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