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2025-09-23 Update From: SLTechnology News&Howtos shulou NAV: SLTechnology News&Howtos > Database >
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This article mainly introduces how to verify the conversion between SQL ID and SQL HASH VALUE in the database, which has a certain reference value, and interested friends can refer to it. I hope you will gain a lot after reading this article.
Purpose: to verify the conversion between SQL ID and SQL HASH VALUE
SQL > set linesize 1000
SQL > select count (1) from tab_01
COUNT (1)
-
85128
SQL > select * from table (dbms_xplan.display_cursor (null,null,'advanced'))
PLAN_TABLE_OUTPUT
- - - - -
SQL_ID 6mhbq2s7z9ydn, child number 0
-
Select count (1) from tab_01
Plan hash value: 4218700832
| | Id | Operation | Name | Rows | Cost (% CPU) | Time |
| | 0 | SELECT STATEMENT | 342100 | | |
| | 1 | SORT AGGREGATE | | 1 |
PLAN_TABLE_OUTPUT
- - - - -
| | 2 | TABLE ACCESS FULL | TAB_01 | 85128 | 342 (1) | 00:00:01 |
Query Block Name / Object Alias (identified by operation id):
1-SEL$1
2-SEL$1 / TAB_01@SEL$1
Outline Data
-
PLAN_TABLE_OUTPUT
- - - - -
/ * +
BEGIN_OUTLINE_DATA
IGNORE_OPTIM_EMBEDDED_HINTS
OPTIMIZER_FEATURES_ENABLE ('11.2.0.4')
DB_VERSION ('11.2.0.4')
ALL_ROWS
OUTLINE_LEAF (@ "SEL$1")
FULL (@ "SEL$1"TAB_01" @ "SEL$1")
END_OUTLINE_DATA
, /
PLAN_TABLE_OUTPUT
- - - - -
Column Projection Information (identified by operation id):
1-(# keys=0) COUNT (*) [22]
39 lines have been selected.
SQL > select sql_text,sql_id,hash_value,child_number from v$sql where sql_text like 'select count (1) from tab_01%'
SQL_TEXT
- - - - - - - - -
SQL_ID HASH_VALUE CHILD_NUMBER
Select count (1) from tab_01
6mhbq2s7z9ydn 267712948 0
SQL > select lower (trim ('6mhbq2s7z9ydn')) sql_id,trunc (sum ((instr (' 0123456789abcdfghjkmpqrstuvwydnpqr (trim ('6mhbq2s7z9ydn'), level, 1))-1) *
2 power (32, length (trim ('6mhbq2s7z9ydn'))-level), power (2,32)) hash_value from dual connect by level
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