10 Oracle跑批慢常用檢查手冊
第一部分 檢查資料庫 To p Event
建議優先檢查資料庫中當前非空閒的等待,並關注執行時間較長的會話和 S QL 語句,例如:
col event for a30 set lines 299 select inst_id, event, sid, sql_id, state, last_call_et, blocking_session, blocking_session_status from gv$session where wait_class <> 'Idle';
輸出示例:
第二部分 檢查 S QL 執行計劃
2.1 檢查 S QL 當前執行計劃
使用 DBMS_XPLAN 包,獲取該 S QL 在遊標中快取的執行計劃,如下:
select * from table(DBMS_XPLAN.DISPLAY_CURSOR('11rcdwq9y4ngp'));
輸出示例:
2.2 檢查 S QL 歷史執行計劃
根使用 DBMS_XPLAN 包,獲取該 S QL 在自動工作負載資料庫 A WR 中儲存的執行計劃,如下:
select * from table(DBMS_XPLAN.DISPLAY_AWR('11rcdwq9y4ngp'));
輸出示例:
第三部分 檢查物件統計資訊
3.1 檢查表統計資訊
查詢 dba_tables 字典檢視,可以確認業務表最近一次統計資訊收集的時間,以此評估統計資訊是否過久,如果業務表未收集統計資訊則 last_analyzed 欄位為空,如下:
select t.owner, t.table_name, t.num_rows, t.sample_size, t.blocks, last_analyzed from dba_tables t where t.owner = 'SYS' and t.table_name in('JASON1','JASON2','JASON3');
輸出示例:
3.2 檢查表欄位統計資訊
查詢 dba_tab_col_statistics 字典檢視,可以確認業務表欄位最近一次統計資訊收集的時間,以此評估統計資訊是否過久,如果業務表欄位未收集統計資訊則輸出為空,如下:
select owner, table_name, column_name, num_distinct, num_nulls, num_buckets, histogram, last_analyzed from dba_tab_col_statistics where owner = 'SYS' and table_name = 'JASON1';
輸出示例:
3.3 收集表統計資訊
exec dbms_stats.gather_table_stats(ownname=>' SYS ',tabname=>' JASON1 ',estimate_percent=>10,Degree=>8,Cascade=>TRUE,Granularity=>'ALL',method_opt=>'FOR ALL INDEXED COLUMNS SIZE AUTO');
3.4 回退表統計資訊
檢查統計資訊保留時間,如下:
select DBMS_STATS.GET_STATS_HISTORY_RETENTION from dual;
檢查統計資訊歷史最早可用時間,如下:
select DBMS_STATS.GET_STATS_HISTORY_AVAILABILITY from dual;
手動設定統計資訊保留時間,如下:
exec DBMS_STATS.ALTER_STATS_HISTORY_RETENTION (60);
手動將業務表統計資訊回滾到某個歷史時間,如下:
BEGIN DBMS_STATS.restore_table_stats(ownname => 'SYS',tabname => 'JASON1',as_of_timestamp => '28-FEB-23 03.18.44.999999 PM +08:00'); END ; /
3.5 刪除表統計資訊
刪除表統計資訊,如下:
exec dbms_stats.delete_table_stats(ownname=>'SYS',tabname=>'JASON1');
刪除表欄位統計資訊,如下:
exec dbms_stats.delete_column_stats(ownname=>'SYS',tabname=>'JASON1',colname=>'OBJECT_ID');
第四部分 固定 SQL 執行計劃
4.1 上傳 coe_xfr_sql_profile.sql 指令碼
SPO coe_xfr_sql_profile.log; SET DEF ON TERM OFF ECHO ON FEED OFF VER OFF HEA ON LIN 2000 PAGES 100 LONG 8000000 LONGC 800000 TRIMS ON TI OFF TIMI OFF SERVEROUT ON SIZE 1000000 NUMF "" SQLP SQL>; SET SERVEROUT ON SIZE UNL; REM REM $Header: 215187.1 coe_xfr_sql_profile.sql 11.4.5.5 2013/03/01 carlos.sierra $ REM REM Copyright (c) 2000-2013, Oracle Corporation. All rights reserved. REM REM AUTHOR REM carlos.sierra@oracle.com REM REM SCRIPT REM coe_xfr_sql_profile.sql REM REM DESCRIPTION REM This script generates another that contains the commands to REM create a manual custom SQL Profile out of a known plan from REM memory or AWR. The manual custom profile can be implemented REM into the same SOURCE system where the plan was retrieved, REM or into another similar TARGET system that has same schema REM objects referenced by the SQL that generated the known plan. REM REM PRE-REQUISITES REM 1. Oracle Tuning Pack license. REM REM PARAMETERS REM 1. SQL_ID (required) REM 2. Plan Hash Value for which a manual custom SQL Profile is REM needed (required). A list of known plans is presented. REM You may choose from list provided or enter a valid phv REM from a version of the SQL modified with Hints. REM REM EXECUTION REM 1. Connect into SQL*Plus as user with access to data dictionary. REM Do not use SYS. REM 2. Execute script coe_xfr_sql_profile.sql passing SQL_ID and REM plan hash value (parameters can be passed inline or until REM requested). REM REM EXAMPLE REM # sqlplus system REM SQL> START coe_xfr_sql_profile.sql [SQL_ID] [PLAN_HASH_VALUE]; REM SQL> START coe_xfr_sql_profile.sql gnjy0mn4y9pbm 2055843663; REM SQL> START coe_xfr_sql_profile.sql gnjy0mn4y9pbm; REM SQL> START coe_xfr_sql_profile.sql; REM REM NOTES REM 1. For possible errors see coe_xfr_sql_profile.log REM 2. If SQLT is installed in SOURCE, you can use instead: REM sqlt/utl/sqltprofile.sql REM 3. Be aware that using DBMS_SQLTUNE requires a license for REM Oracle Tuning Pack. REM 4. Use a DBA user but not SYS. REM 5. If you get "ORA-06532: Subscript outside of limit, ORA-06512: at line 1" REM Then you may consider this change (only in a test and disposable system): REM create or replace TYPE sys.sqlprof_attr AS VARRAY(5000) of VARCHAR2(500); REM SET TERM ON ECHO OFF; PRO PRO Parameter 1: PRO SQL_ID (required) PRO DEF sql_id = '&1'; PRO WITH p AS ( SELECT plan_hash_value FROM gv$sql_plan WHERE sql_id = TRIM('&&sql_id.') AND other_xml IS NOT NULL UNION SELECT plan_hash_value FROM dba_hist_sql_plan WHERE sql_id = TRIM('&&sql_id.') AND other_xml IS NOT NULL ), m AS ( SELECT plan_hash_value, SUM(elapsed_time)/SUM(executions) avg_et_secs FROM gv$sql WHERE sql_id = TRIM('&&sql_id.') AND executions > 0 GROUP BY plan_hash_value ), a AS ( SELECT plan_hash_value, SUM(elapsed_time_total)/SUM(executions_total) avg_et_secs FROM dba_hist_sqlstat WHERE sql_id = TRIM('&&sql_id.') AND executions_total > 0 GROUP BY plan_hash_value ) SELECT p.plan_hash_value, ROUND(NVL(m.avg_et_secs, a.avg_et_secs)/1e6, 3) avg_et_secs FROM p, m, a WHERE p.plan_hash_value = m.plan_hash_value(+) AND p.plan_hash_value = a.plan_hash_value(+) ORDER BY avg_et_secs NULLS LAST; PRO PRO Parameter 2: PRO PLAN_HASH_VALUE (required) PRO DEF plan_hash_value = '&2'; PRO PRO Values passed to coe_xfr_sql_profile: PRO ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ PRO SQL_ID : "&&sql_id." PRO PLAN_HASH_VALUE: "&&plan_hash_value." PRO SET TERM OFF ECHO ON; WHENEVER SQLERROR EXIT SQL.SQLCODE; -- trim parameters COL sql_id NEW_V sql_id FOR A30; COL plan_hash_value NEW_V plan_hash_value FOR A30; SELECT TRIM('&&sql_id.') sql_id, TRIM('&&plan_hash_value.') plan_hash_value FROM DUAL; VAR sql_text CLOB; VAR sql_text2 CLOB; VAR other_xml CLOB; EXEC :sql_text := NULL; EXEC :sql_text2 := NULL; EXEC :other_xml := NULL; -- get sql_text from memory DECLARE l_sql_text VARCHAR2(32767); BEGIN -- 10g see bug 5017909 FOR i IN (SELECT DISTINCT piece, sql_text FROM gv$sqltext_with_newlines WHERE sql_id = TRIM('&&sql_id.') ORDER BY 1, 2) LOOP IF :sql_text IS NULL THEN DBMS_LOB.CREATETEMPORARY(:sql_text, TRUE); DBMS_LOB.OPEN(:sql_text, DBMS_LOB.LOB_READWRITE); END IF; -- removes NUL characters l_sql_text := REPLACE(i.sql_text, CHR(00), ' '); -- adds a NUL character at the end of each line DBMS_LOB.WRITEAPPEND(:sql_text, LENGTH(l_sql_text) + 1, l_sql_text||CHR(00)); END LOOP; -- if found in memory then sql_text is not null IF :sql_text IS NOT NULL THEN DBMS_LOB.CLOSE(:sql_text); END IF; EXCEPTION WHEN OTHERS THEN DBMS_OUTPUT.PUT_LINE('getting sql_text from memory: '||SQLERRM); :sql_text := NULL; END; / SELECT :sql_text FROM DUAL; -- get sql_text from awr DECLARE l_sql_text VARCHAR2(32767); l_clob_size NUMBER; l_offset NUMBER; BEGIN IF :sql_text IS NULL OR NVL(DBMS_LOB.GETLENGTH(:sql_text), 0) = 0 THEN SELECT sql_text INTO :sql_text2 FROM dba_hist_sqltext WHERE sql_id = TRIM('&&sql_id.') AND sql_text IS NOT NULL AND ROWNUM = 1; END IF; -- if found in awr then sql_text2 is not null IF :sql_text2 IS NOT NULL THEN l_clob_size := NVL(DBMS_LOB.GETLENGTH(:sql_text2), 0); l_offset := 1; DBMS_LOB.CREATETEMPORARY(:sql_text, TRUE); DBMS_LOB.OPEN(:sql_text, DBMS_LOB.LOB_READWRITE); -- store in clob as 64 character pieces plus a NUL character at the end of each piece WHILE l_offset < l_clob_size LOOP IF l_clob_size - l_offset > 64 THEN l_sql_text := REPLACE(DBMS_LOB.SUBSTR(:sql_text2, 64, l_offset), CHR(00), ' '); ELSE -- last piece l_sql_text := REPLACE(DBMS_LOB.SUBSTR(:sql_text2, l_clob_size - l_offset + 1, l_offset), CHR(00), ' '); END IF; DBMS_LOB.WRITEAPPEND(:sql_text, LENGTH(l_sql_text) + 1, l_sql_text||CHR(00)); l_offset := l_offset + 64; END LOOP; DBMS_LOB.CLOSE(:sql_text); END IF; EXCEPTION WHEN OTHERS THEN DBMS_OUTPUT.PUT_LINE('getting sql_text from awr: '||SQLERRM); :sql_text := NULL; END; / SELECT :sql_text2 FROM DUAL; SELECT :sql_text FROM DUAL; -- validate sql_text SET TERM ON; BEGIN IF :sql_text IS NULL THEN RAISE_APPLICATION_ERROR(-20100, 'SQL_TEXT for SQL_ID &&sql_id. was not found in memory (gv$sqltext_with_newlines) or AWR (dba_hist_sqltext).'); END IF; END; / SET TERM OFF; -- get other_xml from memory BEGIN FOR i IN (SELECT other_xml FROM gv$sql_plan WHERE sql_id = TRIM('&&sql_id.') AND plan_hash_value = TO_NUMBER(TRIM('&&plan_hash_value.')) AND other_xml IS NOT NULL ORDER BY child_number, id) LOOP :other_xml := i.other_xml; EXIT; -- 1st END LOOP; EXCEPTION WHEN OTHERS THEN DBMS_OUTPUT.PUT_LINE('getting other_xml from memory: '||SQLERRM); :other_xml := NULL; END; / -- get other_xml from awr BEGIN IF :other_xml IS NULL OR NVL(DBMS_LOB.GETLENGTH(:other_xml), 0) = 0 THEN FOR i IN (SELECT other_xml FROM dba_hist_sql_plan WHERE sql_id = TRIM('&&sql_id.') AND plan_hash_value = TO_NUMBER(TRIM('&&plan_hash_value.')) AND other_xml IS NOT NULL ORDER BY id) LOOP :other_xml := i.other_xml; EXIT; -- 1st END LOOP; END IF; EXCEPTION WHEN OTHERS THEN DBMS_OUTPUT.PUT_LINE('getting other_xml from awr: '||SQLERRM); :other_xml := NULL; END; / -- get other_xml from memory from modified SQL BEGIN IF :other_xml IS NULL OR NVL(DBMS_LOB.GETLENGTH(:other_xml), 0) = 0 THEN FOR i IN (SELECT other_xml FROM gv$sql_plan WHERE plan_hash_value = TO_NUMBER(TRIM('&&plan_hash_value.')) AND other_xml IS NOT NULL ORDER BY child_number, id) LOOP :other_xml := i.other_xml; EXIT; -- 1st END LOOP; END IF; EXCEPTION WHEN OTHERS THEN DBMS_OUTPUT.PUT_LINE('getting other_xml from memory: '||SQLERRM); :other_xml := NULL; END; / -- get other_xml from awr from modified SQL BEGIN IF :other_xml IS NULL OR NVL(DBMS_LOB.GETLENGTH(:other_xml), 0) = 0 THEN FOR i IN (SELECT other_xml FROM dba_hist_sql_plan WHERE plan_hash_value = TO_NUMBER(TRIM('&&plan_hash_value.')) AND other_xml IS NOT NULL ORDER BY id) LOOP :other_xml := i.other_xml; EXIT; -- 1st END LOOP; END IF; EXCEPTION WHEN OTHERS THEN DBMS_OUTPUT.PUT_LINE('getting other_xml from awr: '||SQLERRM); :other_xml := NULL; END; / SELECT :other_xml FROM DUAL; -- validate other_xml SET TERM ON; BEGIN IF :other_xml IS NULL THEN RAISE_APPLICATION_ERROR(-20101, 'PLAN for SQL_ID &&sql_id. and PHV &&plan_hash_value. was not found in memory (gv$sql_plan) or AWR (dba_hist_sql_plan).'); END IF; END; / SET TERM OFF; -- generates script that creates sql profile in target system: SET ECHO OFF; PRO coe_xfr_sql_profile_&&sql_id._&&plan_hash_value..sql. SET FEED OFF LIN 666 TRIMS ON TI OFF TIMI OFF SERVEROUT ON SIZE 1000000 FOR WOR; SET SERVEROUT ON SIZE UNL FOR WOR; SPO OFF; SPO coe_xfr_sql_profile_&&sql_id._&&plan_hash_value..sql; DECLARE l_pos NUMBER; l_clob_size NUMBER; l_offset NUMBER; l_sql_text VARCHAR2(32767); l_len NUMBER; l_hint VARCHAR2(32767); BEGIN DBMS_OUTPUT.PUT_LINE('SPO coe_xfr_sql_profile_&&sql_id._&&plan_hash_value..log;'); DBMS_OUTPUT.PUT_LINE('SET ECHO ON TERM ON LIN 2000 TRIMS ON NUMF 99999999999999999999;'); DBMS_OUTPUT.PUT_LINE('REM'); DBMS_OUTPUT.PUT_LINE('REM $Header: 215187.1 coe_xfr_sql_profile_&&sql_id._&&plan_hash_value..sql 11.4.4.4 '||TO_CHAR(SYSDATE, 'YYYY/MM/DD')||' carlos.sierra $'); DBMS_OUTPUT.PUT_LINE('REM'); DBMS_OUTPUT.PUT_LINE('REM Copyright (c) 2000-2012, Oracle Corporation. All rights reserved.'); DBMS_OUTPUT.PUT_LINE('REM'); DBMS_OUTPUT.PUT_LINE('REM AUTHOR'); DBMS_OUTPUT.PUT_LINE('REM carlos.sierra@oracle.com'); DBMS_OUTPUT.PUT_LINE('REM'); DBMS_OUTPUT.PUT_LINE('REM SCRIPT'); DBMS_OUTPUT.PUT_LINE('REM coe_xfr_sql_profile_&&sql_id._&&plan_hash_value..sql'); DBMS_OUTPUT.PUT_LINE('REM'); DBMS_OUTPUT.PUT_LINE('REM DESCRIPTION'); DBMS_OUTPUT.PUT_LINE('REM This script is generated by coe_xfr_sql_profile.sql'); DBMS_OUTPUT.PUT_LINE('REM It contains the SQL*Plus commands to create a custom'); DBMS_OUTPUT.PUT_LINE('REM SQL Profile for SQL_ID &&sql_id. based on plan hash'); DBMS_OUTPUT.PUT_LINE('REM value &&plan_hash_value..'); DBMS_OUTPUT.PUT_LINE('REM The custom SQL Profile to be created by this script'); DBMS_OUTPUT.PUT_LINE('REM will affect plans for SQL commands with signature'); DBMS_OUTPUT.PUT_LINE('REM matching the one for SQL Text below.'); DBMS_OUTPUT.PUT_LINE('REM Review SQL Text and adjust accordingly.'); DBMS_OUTPUT.PUT_LINE('REM'); DBMS_OUTPUT.PUT_LINE('REM PARAMETERS'); DBMS_OUTPUT.PUT_LINE('REM None.'); DBMS_OUTPUT.PUT_LINE('REM'); DBMS_OUTPUT.PUT_LINE('REM EXAMPLE'); DBMS_OUTPUT.PUT_LINE('REM SQL> START coe_xfr_sql_profile_&&sql_id._&&plan_hash_value..sql;'); DBMS_OUTPUT.PUT_LINE('REM'); DBMS_OUTPUT.PUT_LINE('REM NOTES'); DBMS_OUTPUT.PUT_LINE('REM 1. Should be run as SYSTEM or SYSDBA.'); DBMS_OUTPUT.PUT_LINE('REM 2. User must have CREATE ANY SQL PROFILE privilege.'); DBMS_OUTPUT.PUT_LINE('REM 3. SOURCE and TARGET systems can be the same or similar.'); DBMS_OUTPUT.PUT_LINE('REM 4. To drop this custom SQL Profile after it has been created:'); DBMS_OUTPUT.PUT_LINE('REM EXEC DBMS_SQLTUNE.DROP_SQL_PROFILE(''coe_&&sql_id._&&plan_hash_value.'');'); DBMS_OUTPUT.PUT_LINE('REM 5. Be aware that using DBMS_SQLTUNE requires a license'); DBMS_OUTPUT.PUT_LINE('REM for the Oracle Tuning Pack.'); DBMS_OUTPUT.PUT_LINE('REM 6. If you modified a SQL putting Hints in order to produce a desired'); DBMS_OUTPUT.PUT_LINE('REM Plan, you can remove the artifical Hints from SQL Text pieces below.'); DBMS_OUTPUT.PUT_LINE('REM By doing so you can create a custom SQL Profile for the original'); DBMS_OUTPUT.PUT_LINE('REM SQL but with the Plan captured from the modified SQL (with Hints).'); DBMS_OUTPUT.PUT_LINE('REM'); DBMS_OUTPUT.PUT_LINE('WHENEVER SQLERROR EXIT SQL.SQLCODE;'); DBMS_OUTPUT.PUT_LINE('REM'); DBMS_OUTPUT.PUT_LINE('VAR signature NUMBER;'); DBMS_OUTPUT.PUT_LINE('VAR signaturef NUMBER;'); DBMS_OUTPUT.PUT_LINE('REM'); DBMS_OUTPUT.PUT_LINE('DECLARE'); DBMS_OUTPUT.PUT_LINE('sql_txt CLOB;'); DBMS_OUTPUT.PUT_LINE('h SYS.SQLPROF_ATTR;'); DBMS_OUTPUT.PUT_LINE('PROCEDURE wa (p_line IN VARCHAR2) IS'); DBMS_OUTPUT.PUT_LINE('BEGIN'); DBMS_OUTPUT.PUT_LINE('DBMS_LOB.WRITEAPPEND(sql_txt, LENGTH(p_line), p_line);'); DBMS_OUTPUT.PUT_LINE('END wa;'); DBMS_OUTPUT.PUT_LINE('BEGIN'); DBMS_OUTPUT.PUT_LINE('DBMS_LOB.CREATETEMPORARY(sql_txt, TRUE);'); DBMS_OUTPUT.PUT_LINE('DBMS_LOB.OPEN(sql_txt, DBMS_LOB.LOB_READWRITE);'); DBMS_OUTPUT.PUT_LINE('-- SQL Text pieces below do not have to be of same length.'); DBMS_OUTPUT.PUT_LINE('-- So if you edit SQL Text (i.e. removing temporary Hints),'); DBMS_OUTPUT.PUT_LINE('-- there is no need to edit or re-align unmodified pieces.'); l_clob_size := NVL(DBMS_LOB.GETLENGTH(:sql_text), 0); l_offset := 1; WHILE l_offset < l_clob_size LOOP l_pos := DBMS_LOB.INSTR(:sql_text, CHR(00), l_offset); IF l_pos > 0 THEN l_len := l_pos - l_offset; ELSE -- last piece l_len := l_clob_size - l_pos + 1; END IF; l_sql_text := DBMS_LOB.SUBSTR(:sql_text, l_len, l_offset); /* cannot do such 3 replacement since a line could end with a comment using "--" l_sql_text := REPLACE(l_sql_text, CHR(10), ' '); -- replace LF with SP l_sql_text := REPLACE(l_sql_text, CHR(13), ' '); -- replace CR with SP l_sql_text := REPLACE(l_sql_text, CHR(09), ' '); -- replace TAB with SP */ l_offset := l_offset + l_len + 1; IF l_len > 0 THEN IF INSTR(l_sql_text, '''[') + INSTR(l_sql_text, ']''') = 0 THEN l_sql_text := '['||l_sql_text||']'; ELSIF INSTR(l_sql_text, '''{') + INSTR(l_sql_text, '}''') = 0 THEN l_sql_text := '{'||l_sql_text||'}'; ELSIF INSTR(l_sql_text, '''<') + INSTR(l_sql_text, '>''') = 0 THEN l_sql_text := '<'||l_sql_text||'>'; ELSIF INSTR(l_sql_text, '''(') + INSTR(l_sql_text, ')''') = 0 THEN l_sql_text := '('||l_sql_text||')'; ELSIF INSTR(l_sql_text, '''"') + INSTR(l_sql_text, '"''') = 0 THEN l_sql_text := '"'||l_sql_text||'"'; ELSIF INSTR(l_sql_text, '''|') + INSTR(l_sql_text, '|''') = 0 THEN l_sql_text := '|'||l_sql_text||'|'; ELSIF INSTR(l_sql_text, '''~') + INSTR(l_sql_text, '~''') = 0 THEN l_sql_text := '~'||l_sql_text||'~'; ELSIF INSTR(l_sql_text, '''^') + INSTR(l_sql_text, '^''') = 0 THEN l_sql_text := '^'||l_sql_text||'^'; ELSIF INSTR(l_sql_text, '''@') + INSTR(l_sql_text, '@''') = 0 THEN l_sql_text := '@'||l_sql_text||'@'; ELSIF INSTR(l_sql_text, '''#') + INSTR(l_sql_text, '#''') = 0 THEN l_sql_text := '#'||l_sql_text||'#'; ELSIF INSTR(l_sql_text, '''%') + INSTR(l_sql_text, '%''') = 0 THEN l_sql_text := '%'||l_sql_text||'%'; ELSIF INSTR(l_sql_text, '''$') + INSTR(l_sql_text, '$''') = 0 THEN l_sql_text := '$'||l_sql_text||'$'; ELSE l_sql_text := CHR(96)||l_sql_text||CHR(96); END IF; DBMS_OUTPUT.PUT_LINE('wa(q'''||l_sql_text||''');'); END IF; END LOOP; DBMS_OUTPUT.PUT_LINE('DBMS_LOB.CLOSE(sql_txt);'); DBMS_OUTPUT.PUT_LINE('h := SYS.SQLPROF_ATTR('); DBMS_OUTPUT.PUT_LINE('q''[BEGIN_OUTLINE_DATA]'','); FOR i IN (SELECT /*+ opt_param('parallel_execution_enabled', 'false') */ SUBSTR(EXTRACTVALUE(VALUE(d), '/hint'), 1, 4000) hint FROM TABLE(XMLSEQUENCE(EXTRACT(XMLTYPE(:other_xml), '/*/outline_data/hint'))) d) LOOP l_hint := i.hint; WHILE NVL(LENGTH(l_hint), 0) > 0 LOOP IF LENGTH(l_hint) <= 500 THEN DBMS_OUTPUT.PUT_LINE('q''['||l_hint||']'','); l_hint := NULL; ELSE l_pos := INSTR(SUBSTR(l_hint, 1, 500), ' ', -1); DBMS_OUTPUT.PUT_LINE('q''['||SUBSTR(l_hint, 1, l_pos)||']'','); l_hint := ' '||SUBSTR(l_hint, l_pos); END IF; END LOOP; END LOOP; DBMS_OUTPUT.PUT_LINE('q''[END_OUTLINE_DATA]'');'); DBMS_OUTPUT.PUT_LINE(':signature := DBMS_SQLTUNE.SQLTEXT_TO_SIGNATURE(sql_txt);'); DBMS_OUTPUT.PUT_LINE(':signaturef := DBMS_SQLTUNE.SQLTEXT_TO_SIGNATURE(sql_txt, TRUE);'); DBMS_OUTPUT.PUT_LINE('DBMS_SQLTUNE.IMPORT_SQL_PROFILE ('); DBMS_OUTPUT.PUT_LINE('sql_text => sql_txt,'); DBMS_OUTPUT.PUT_LINE('profile => h,'); DBMS_OUTPUT.PUT_LINE('name => ''coe_&&sql_id._&&plan_hash_value.'','); DBMS_OUTPUT.PUT_LINE('description => ''coe &&sql_id. &&plan_hash_value. ''||:signature||'' ''||:signaturef||'''','); DBMS_OUTPUT.PUT_LINE('category => ''DEFAULT'','); DBMS_OUTPUT.PUT_LINE('validate => TRUE,'); DBMS_OUTPUT.PUT_LINE('replace => TRUE,'); DBMS_OUTPUT.PUT_LINE('force_match => FALSE /* TRUE:FORCE (match even when different literals in SQL). FALSE:EXACT (similar to CURSOR_SHARING) */ );'); DBMS_OUTPUT.PUT_LINE('DBMS_LOB.FREETEMPORARY(sql_txt);'); DBMS_OUTPUT.PUT_LINE('END;'); DBMS_OUTPUT.PUT_LINE('/'); DBMS_OUTPUT.PUT_LINE('WHENEVER SQLERROR CONTINUE'); DBMS_OUTPUT.PUT_LINE('SET ECHO OFF;'); DBMS_OUTPUT.PUT_LINE('PRINT signature'); DBMS_OUTPUT.PUT_LINE('PRINT signaturef'); DBMS_OUTPUT.PUT_LINE('PRO'); DBMS_OUTPUT.PUT_LINE('PRO ... manual custom SQL Profile has been created'); DBMS_OUTPUT.PUT_LINE('PRO'); DBMS_OUTPUT.PUT_LINE('SET TERM ON ECHO OFF LIN 80 TRIMS OFF NUMF "";'); DBMS_OUTPUT.PUT_LINE('SPO OFF;'); DBMS_OUTPUT.PUT_LINE('PRO'); DBMS_OUTPUT.PUT_LINE('PRO COE_XFR_SQL_PROFILE_&&sql_id._&&plan_hash_value. completed'); END; / SPO OFF; SET DEF ON TERM ON ECHO OFF FEED 6 VER ON HEA ON LIN 80 PAGES 14 LONG 80 LONGC 80 TRIMS OFF TI OFF TIMI OFF SERVEROUT OFF NUMF "" SQLP SQL>; SET SERVEROUT OFF; PRO PRO Execute coe_xfr_sql_profile_&&sql_id._&&plan_hash_value..sql PRO on TARGET system in order to create a custom SQL Profile PRO with plan &&plan_hash_value linked to adjusted sql_text. PRO UNDEFINE 1 2 sql_id plan_hash_value CL COL PRO PRO COE_XFR_SQL_PROFILE completed.
4.2 執行 coe_xfr_sql_profile.sql 指令碼
SQL>@coe_xfr_sql_profile.sql
輸出示例:
4.3 執行生成的 .sql 指令碼
SQL> @coe_xfr_sql_profile_dtbp4dwzqqf7v_2001571142.sql
輸出示例:
4.4 檢查執行計劃固定情況
查詢 dba_sql_profiles 字典檢視,檢查業務 SQL 對應的執行計劃是否繫結,並且可用觀測繫結的時間,如下:
select name,sql_text,created,status from dba_sql_profiles;
輸出示例:
4.5 確認 S QL 執行計劃固定
先執行實際業務 S QL 語句,待執行結束,使用 dbms_xplan.display_cursor 獲取該語句真實執行計劃,如下:
select * from (select * from jason where object_id=21) where rownum<=2
select * from table(dbms_xplan.display_cursor(null,null,'ALLSTATS LAST'));
輸出示例:
來自 “ ITPUB部落格 ” ,連結:http://blog.itpub.net/30310891/viewspace-2938348/,如需轉載,請註明出處,否則將追究法律責任。
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