在生产环境中有一些sql语句出现问题,大多是一些很紧急的问题,可能有些sql语句出现了执行计划的问题,通过hint能够做很大的改进,但是如果想让变更尽快生效,可以使用sql_profile来实现。
说起sql_profile的创建有两种方式,一种是自动,通过sql tuning的功能能够得到一些建议,会自动生成sql_profile,只需要启用即可,如果需要手工创建则需要费一些功夫。
描述都是自己简单总结的。
step1: get sqlt and transfer to target env
get sqlt.zip as attached, unzip and transferred to target
environment, there is no need to config anything in advance for this
scenario.
sqlt.zip
step2: get sql_id which need to be tuned(which is already running,
we can get it from v$sql), and get new sql_id which is tuned (need to consider
bind variable scenario )
issue query is below(sql_id 74pzzzjddkyd4)
SELECT NVL(SUM(CUST.WEIGHT), 0) TOTAL_WEIGHT
FROM BL1_CUSTOMER CUST,
BL1_CYCLE_CUSTOMERS CYC_CUST
WHERE CYC_CUST.PERIOD_KEY = :periodKey
AND CYC_CUST.CYCLE_SEQ_NO = :cycleSeqNo
AND CYC_CUST.CUSTOMER_NO =
CUST.CUSTOMER_ID
AND (CYC_CUST.UNDO_REQ_TYPE = 'N' OR
CYC_CUST.UNDO_REQ_TYPE IS NULL)
AND EXISTS
(SELECT 1
FROM
BL1_CYC_PAYER_POP PAYER, BL1_DOCUMENT DOC
WHERE PAYER.PERIOD_KEY =
:periodKey
AND PAYER.CYCLE_SEQ_NO = :cycleSeqNo
AND
PAYER.CYCLE_SEQ_RUN = :cycleSeqRun
AND PAYER.CUSTOMER_NO =
CYC_CUST.CUSTOMER_NO
AND PAYER.DB_STATUS = 'BL'
AND
(PAYER.UNDO_REQ_TYPE = 'N' OR PAYER.UNDO_REQ_TYPE IS NULL)
AND
PAYER.FORMAT_EXT_DATE IS NULL
AND DOC.PERIOD_KEY =
:periodKey
AND DOC.CYCLE_SEQ_NO = :cycleSeqNo
AND
DOC.CYCLE_SEQ_RUN = :cycleSeqRun
AND PAYER.BA_NO =
DOC.BA_NO
AND doc.DOC_PRODUCE_IND IN ('Y', 'E'))
and we can get new sql_id using
below.sql_id(gc2kzv3ytkhhu)
get sql_id for tuned sql(with additional hints)
variable periodKey number;
variable cycleSeqNo number;
variable
cycleSeqRun number;
exec :periodKey:=61;
exec :cycleSeqNo:=4106;
exec
:cycleSeqRun:=0;
SELECT NVL(SUM(CUST.WEIGHT), 0) TOTAL_WEIGHT
FROM BL1_CUSTOMER CUST,
BL1_CYCLE_CUSTOMERS CYC_CUST
WHERE CYC_CUST.PERIOD_KEY = :periodKey
AND CYC_CUST.CYCLE_SEQ_NO = :cycleSeqNo
AND CYC_CUST.CUSTOMER_NO =
CUST.CUSTOMER_ID
AND (CYC_CUST.UNDO_REQ_TYPE = 'N' OR
CYC_CUST.UNDO_REQ_TYPE IS NULL)
AND EXISTS
(SELECT 1
FROM
BL1_CYC_PAYER_POP PAYER, BL1_DOCUMENT DOC
WHERE PAYER.PERIOD_KEY =
:periodKey
AND PAYER.CYCLE_SEQ_NO = :cycleSeqNo
AND
PAYER.CYCLE_SEQ_RUN = :cycleSeqRun
AND PAYER.CUSTOMER_NO =
CYC_CUST.CUSTOMER_NO
AND PAYER.DB_STATUS = 'BL'
AND
(PAYER.UNDO_REQ_TYPE = 'N' OR PAYER.UNDO_REQ_TYPE IS NULL)
AND
PAYER.FORMAT_EXT_DATE IS NULL
AND DOC.PERIOD_KEY =
:periodKey
AND DOC.CYCLE_SEQ_NO = :cycleSeqNo
AND
DOC.CYCLE_SEQ_RUN = :cycleSeqRun
AND PAYER.BA_NO =
DOC.BA_NO
AND doc.DOC_PRODUCE_IND IN ('Y', 'E'))
and fetch it from v$sql
SQL_ID SQL_FULLTEXT
-------------
----------------------------------------------------------------------------------------------------
gc2kzv3ytkhhu
SELECT NVL(SUM(CUST.WEIGHT), 0) TOTAL_WEIGHT
FROM
BL1_CUSTOMER CUST, BL1_CYCLE_CUSTOMERS CYC_CUST
WHERE
CYC_CUST.PERIOD_KEY = :periodKey
AND CYC_CUST.CYCLE_SEQ_NO =
:cycleSeqNo
AND CYC_CUST.CUSTOMER_NO =
CUST.CUSTOMER_ID
AND (CYC_CUST.UNDO_REQ_TYPE = 'N' OR
CYC_CUST.UNDO_REQ_TYPE IS NULL)
AND EXISTS
(SELECT /*+ unnest parallel(payer,4) full(payer)*/1
FROM BL1_CYC_PAYER_POP PAYER, BL1_DOCUMENT DOC
WHERE
PAYER.PERIOD_KEY = :periodKey
AND PAYER.CYCLE_SEQ_NO
= :cycleSeqNo
AND PAYER.CYCLE_SEQ_RUN =
:cycleSeqRun
AND PAYER.CUSTOMER_NO =
CYC_CUST.CUSTOMER_NO
AND PAYER.DB_STATUS =
'BL'
AND (PAYER.UNDO_REQ_TYPE = 'N' OR
PAYER.UNDO_REQ_TYPE IS NULL)
AND
PAYER.FORMAT_EXT_DATE IS NULL
AND DOC.PERIOD_KEY =
:periodKey
AND DOC.CYCLE_SEQ_NO =
:cycleSeqNo
AND DOC.CYCLE_SEQ_RUN =
:cycleSeqRun
AND PAYER.BA_NO =
DOC.BA_NO
AND doc.DOC_PRODUCE_IND IN ('Y',
'E'))
step3: generate script to create sql profile and verify
go to sqlt path.
sqlt/utl> ls -lrt coe_xfr_sql_profile.sql
-rw-r--r-- 1 oraccbs1 dba 19045
Oct 31 01:00 coe_xfr_sql_profile.sql
use dba account and run script coe_xfr_sql_profile.sql, input sql_id
and hash_value.
sqlt/utl> sqlplus n1/n1
SQL*Plus: Release
11.2.0.2.0 Production on Wed Feb 4 16:12:27 2015
Copyright (c) 1982, 2010,
Oracle. All rights reserved.
Connected to:
Oracle Database 11g Enterprise
Edition Release 11.2.0.2.0 - 64bit Production
With the Partitioning, OLAP,
Data Mining and Real Application Testing options
SQL>
@coe_xfr_sql_profile.sql
Parameter 1:
SQL_ID (required)
Enter
value for 1: gc2kzv3ytkhhu
PLAN_HASH_VALUE AVG_ET_SECS
--------------- -----------
3780786163
Parameter 2:
PLAN_HASH_VALUE (required)
Enter value for 2: 3780786163
Values passed to
coe_xfr_sql_profile:
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
SQL_ID :
"gc2kzv3ytkhhu"
PLAN_HASH_VALUE: "3780786163"
SQL>BEGIN
2 IF :sql_text IS NULL THEN
3
RAISE_APPLICATION_ERROR(-20100, 'SQL_TEXT for SQL_ID &&sql_id. was not
found in memory (gv$sqltext_with_newlines) or AWR (dba_hist_sqltext).');
4 END IF;
5 END;
6 /
SQL>SET TERM OFF;
SQL>BEGIN
2 IF :other_xml IS NULL THEN
3 RAISE_APPLICATION_ERROR(-20101,
'PLAN for SQL_ID &&sql_id. and PHV &&plan_hash_value. was not
found in memory (gv$sql_plan) or AWR (dba_hist_sql_plan).');
4 END
IF;
5 END;
6 /
SQL>SET TERM OFF;
Execute coe_xfr_sql_profile_gc2kzv3ytkhhu_3780786163.sql
on TARGET system
in order to create a custom SQL Profile
with plan 3780786163 linked to
adjusted sql_text.
COE_XFR_SQL_PROFILE completed.
there will be one file for sql_id
generated like coe_xfr_sql_profile_gc2kzv3ytkhhu_3780786163.sql
for sql_id 74pzzzjddkyd4, use the same steps as above to generate
related file, file name will be
coe_xfr_sql_profile_74pzzzjddkyd4_1323438769.sql
as of now, coe_xfr_sql_profile_74pzzzjddkyd4_1323438769.sql is script for
sql_id 74pzzzjddkyd4 which has issue and
running.
coe_xfr_sql_profile_gc2kzv3ytkhhu_3780786163.sql is script for
sql_id gc2kzv3ytkhhu which is tuned
step4: replace hints and crete sql profile.
we will need to change below from
coe_xfr_sql_profile_74pzzzjddkyd4_1323438769.sql
h :=
SYS.SQLPROF_ATTR(
q'[BEGIN_OUTLINE_DATA]',
q'[IGNORE_OPTIM_EMBEDDED_HINTS]',
q'[OPTIMIZER_FEATURES_ENABLE('11.2.0.2')]',
q'[DB_VERSION('11.2.0.2')]',
q'[OPT_PARAM('_optim_peek_user_binds'
'false')]',
q'[OPT_PARAM('optimizer_dynamic_sampling'
0)]',
q'[OPT_PARAM('_optimizer_cost_based_transformation'
'off')]',
q'[OPT_PARAM('_optimizer_skip_scan_enabled'
'false')]',
q'[OPT_PARAM('_optimizer_use_feedback'
'false')]',
q'[OPT_PARAM('optimizer_index_cost_adj'
10)]',
q'[OPT_PARAM('optimizer_index_caching'
90)]',
q'[ALL_ROWS]',
q'[OUTLINE_LEAF(@"SEL$2")]',
q'[OUTLINE_LEAF(@"SEL$1")]',
q'[FULL(@"SEL$1" "CYC_CUST"@"SEL$1")]',
q'[INDEX(@"SEL$1" "CUST"@"SEL$1"
("BL1_CUSTOMER"."CUSTOMER_ID"))]',
q'[LEADING(@"SEL$1" "CYC_CUST"@"SEL$1" "CUST"@"SEL$1")]',
q'[USE_NL(@"SEL$1" "CUST"@"SEL$1")]',
q'[NLJ_BATCHING(@"SEL$1" "CUST"@"SEL$1")]',
q'[INDEX_RS_ASC(@"SEL$2" "PAYER"@"SEL$2"
("BL1_CYC_PAYER_POP"."CUSTOMER_NO"))]',
q'[INDEX(@"SEL$2" "DOC"@"SEL$2"
("BL1_DOCUMENT"."BA_NO"))]',
q'[LEADING(@"SEL$2" "PAYER"@"SEL$2" "DOC"@"SEL$2")]',
q'[USE_NL(@"SEL$2" "DOC"@"SEL$2")]',
q'[NLJ_BATCHING(@"SEL$2" "DOC"@"SEL$2")]',
q'[END_OUTLINE_DATA]');
to below which is from coe_xfr_sql_profile_gc2kzv3ytkhhu_3780786163.sql
h
:=
SYS.SQLPROF_ATTR(
q'[BEGIN_OUTLINE_DATA]',
q'[IGNORE_OPTIM_EMBEDDED_HINTS]',
q'[OPTIMIZER_FEATURES_ENABLE('11.2.0.2')]',
q'[DB_VERSION('11.2.0.2')]',
q'[OPT_PARAM('_optim_peek_user_binds'
'false')]',
q'[OPT_PARAM('optimizer_dynamic_sampling'
0)]',
q'[OPT_PARAM('_optimizer_cost_based_transformation'
'off')]',
q'[OPT_PARAM('_optimizer_skip_scan_enabled'
'false')]',
q'[OPT_PARAM('_optimizer_use_feedback'
'false')]',
q'[OPT_PARAM('optimizer_index_cost_adj'
10)]',
q'[OPT_PARAM('optimizer_index_caching'
90)]',
q'[ALL_ROWS]',
q'[OUTLINE_LEAF(@"SEL$683B0107")]',
q'[OUTLINE_LEAF(@"SEL$C772B8D1")]',
q'[UNNEST(@"SEL$2")]',
q'[OUTLINE(@"SEL$2")]',
q'[OUTLINE(@"SEL$7511BFD2")]',
q'[OUTLINE(@"SEL$1")]',
q'[NO_ACCESS(@"SEL$C772B8D1" "VW_SQ_1"@"SEL$7511BFD2")]',
q'[INDEX_RS_ASC(@"SEL$C772B8D1" "CYC_CUST"@"SEL$1" ("BL1_CYCLE_CUSTOMERS"."CUSTOMER_NO"
"BL1_CYCLE_CUSTOMERS"."CYCLE_SEQ_NO" "BL1_CYCLE_CUSTOMERS"."PERIOD_KEY"
"BL1_CYCLE_CUSTOMERS"."CUSTOMER_KEY"))]',
q'[INDEX(@"SEL$C772B8D1" "CUST"@"SEL$1"
("BL1_CUSTOMER"."CUSTOMER_ID"))]',
q'[LEADING(@"SEL$C772B8D1" "VW_SQ_1"@"SEL$7511BFD2" "CYC_CUST"@"SEL$1" "CUST"@"SEL$1")]',
q'[USE_NL(@"SEL$C772B8D1" "CYC_CUST"@"SEL$1")]',
q'[USE_NL(@"SEL$C772B8D1" "CUST"@"SEL$1")]',
q'[NLJ_BATCHING(@"SEL$C772B8D1" "CUST"@"SEL$1")]',
q'[PQ_DISTRIBUTE(@"SEL$C772B8D1" "CYC_CUST"@"SEL$1" NONE
BROADCAST)]',
q'[PQ_DISTRIBUTE(@"SEL$C772B8D1" "CUST"@"SEL$1" NONE BROADCAST)]',
q'[FULL(@"SEL$683B0107" "PAYER"@"SEL$2")]',
q'[INDEX(@"SEL$683B0107" "DOC"@"SEL$2"
("BL1_DOCUMENT"."BA_NO"))]',
q'[LEADING(@"SEL$683B0107" "PAYER"@"SEL$2" "DOC"@"SEL$2")]',
q'[USE_NL(@"SEL$683B0107" "DOC"@"SEL$2")]',
q'[NLJ_BATCHING(@"SEL$683B0107" "DOC"@"SEL$2")]',
q'[PQ_DISTRIBUTE(@"SEL$683B0107" "DOC"@"SEL$2" NONE
BROADCAST)]',
q'[GBY_PUSHDOWN(@"SEL$683B0107")]',
q'[USE_HASH_AGGREGATION(@"SEL$683B0107")]',
q'[END_OUTLINE_DATA]');
finally run script
coe_xfr_sql_profile_74pzzzjddkyd4_1323438769.sql
it will generate
sql profile for sql_id 74pzzzjddkyd4 with tuned hints.
step5: sanity check if execution plan has changed as
expected.