USE_HASH hint
Hello
What happens if this suspicion has the parameter table name?
Do whatever it is in the following example:
SELECT / * + INDEX of USE_NL ORDINATE (LM M) USE_HASH (THE) (E Employee_Last_Name)
INDEX of the INDEX (THE Location_Description) (Employee_Pkey M)
INDEX (LM Location_Pkey) * /.
E.First_Name, select, E.Salary, THE. Description,
M.First_Name, M.Last_Name, LM. Description
EMPLOYEE E, locations, employee M, LM
WHERE select = "Johnson".
AND E.Manager_ID = M.Employee_ID
AND E.Location_ID = THE. Location_id
AND M.Location_ID = LM. Location_id
AND THE. Description = "Dallas".
Thank you.
Your index currently looks like this:
/ * + ORDERED USE_NL (LM M) USE_HASH (THE) (Employee_Last_Name E) INDEX (Location_Description) INDEX (M Employee_Pkey) INDEX (LM Location_Pkey) * /.
tables following, listed in the order they appear in the FROM clause, being the only ones in the query:
Employees E, locations, employee M, localities LM
The 'ordered' indicator (that you should avoid using any recent version of Oracle for the indication leading()) means that the optimizer will consider only the join order E M LM, so he joins THE E and M for the result of the join of E and THE, then LM for the result of the join of E, THE and M.
Use_hash hint tells the optimizerthat when he joined THE the previous join result (which in this case is only table E), it should use a hash join.
Passing indicator use_nl (M LM) is a little hand for the pair of advice "use_nl (M) use_nl (LM)", which respectively said the optimizer to join M to E result and by using a loop join and nested LM to the result of E THE and M by a nested loop.
Concerning
Jonathan Lewis
Tags: Database
Similar Questions
-
Hint USE_HASH involving subqueries
Hello
We request that deals with millions of lines through sequential readings, index analysis xtable_id_IDX is the treatment of about 20 million, ytable_pk index records fewer lines of treatment.
I think as first rowsource treats a wide range of data, nested loop is more expensive, so wanted to try to use hint USE_HASH to force the ytable smaller that build table and xtable as probe, but the optimizer table is recovering not the USE_HASH hint, do not know if it is due to not in / of a subquery.
Could you please help if I can force the optimizer to use hash join with ytable (ytable_pk rowsource) as array of generation and to probe the other's.
It is fine if we use full scan tips complete the two tables instead of the index, I just wanted to see if we can force HASH join in the case.
PS: Change the names of tables, real plan
UPDATE t SET xtable_id = X Xtable
WHERE (xtable_id) NOT IN (SELECT xtable_id FROM ytable)
------------------------------------------------------------------------------------------------
| ID | Operation | Name | Lines | Bytes | Cost (% CPU). Time |
------------------------------------------------------------------------------------------------
| 0 | UPDATE STATEMENT. | 1. 20. 1 (0) | 00:00:01 |
| 1. UPDATE | XTABLE. | | | |
| 2. ANTI NESTED LOOPS. | 1. 20. 1 (0) | 00:00:01 |
| 3. INDEX SCAN FULL | xtable_id_IDX | 1. 13. 0 (0) | 00:00:01 |
|* 4 | INDEX UNIQUE SCAN | ytable_PK | 1. 7. 1 (0) | 00:00:01 |
------------------------------------------------------------------------------------------------
Information of predicates (identified by the operation identity card):
---------------------------------------------------
4 - access ("xtable_id"="ytable_id")
Thanks for your time.
It seems that the plan you want is probably
----------------------------------------------------------------------------------------------------
| ID | Operation | Name | Lines | Bytes | TempSpc | Cost (% CPU). Time |
----------------------------------------------------------------------------------------------------
| 0 | UPDATE STATEMENT. | 17 M | 230 M | | 4552K (1) | 15:10:26 |
| 1. UPDATE | XTABLE. | | | | |
| 2. HASH JOIN ANTI RIGHT | | 17 M | 230 M | | 4552K (1) | 15:10:26 |
| 5. FULL RESTRICTED INDEX SCAN FAST | YTABLE_ID_IDX | 46 M | 312 M | | 26472 (1) | 00:05:18 |
| 3. FULL RESTRICTED INDEX SCAN FAST | XTABLE_PK | 1728M | 11G | | 4364K (1) | 14:32:57 |
----------------------------------------------------------------------------------------------------
To do this, you must refer to something like:
Update
/*+
qb_name (main)
UNNEST (@subq)
attack (t2@main t1@subq)
USE_HASH (T1@subq)
swap_join_inputs (T1@subq)
index_ffs (T1@subq)
index_ffs (T2@main)
*/
XTABLE t2
Set t2.xtable_id = X
where t2.xtable_id not in)
Select / * + qb_name (subq) * / ytable t1 t1.n1
)
/
Whatever you do, it's going to be pretty nasty because of the magnitude of the problem - just hope that you update a large number of lines - and one of the problems is that you will update the index you use pilot request, so that you're going to do nasty things to read-consistency to your own update.
I think the trick (as suggested above) HASH_AJ may have been deprecated in 10g, is said by the way.
Concerning
Jonathan Lewis
-
Help setting up a SQL query with poor performance
Hi all
Database version: 10.2.0.5
I'm working on a new report to view the top users by the number of calls. The table is truncated and filled again every month with records for the previous month; It contains approximately 400 000 records.
I created a view with the columns needed for the report; also, the two functions of view calls to determine if a phone number is assigned to multiple staffs or several departments.
It's full again table every month:
CREATE TABLE "VOIP"."MONTHLY_BILLING_DETAILS" ( "ID" NUMBER NOT NULL ENABLE, "CDRRECORDTYPE" NUMBER, "G_CALLMANAGERID" NUMBER, "G_CALLID" NUMBER, "O_LEGCALLIDENTIFIER" NUMBER, "DATETIMEORIGINATION" NUMBER, "O_NODEID" NUMBER, "O_SPAN" NUMBER, "O_IPADDR" NUMBER, "CALLINGPARTYNUMBER" VARCHAR2(50 BYTE) NOT NULL ENABLE, "CALLINGPARTY_USERID" VARCHAR2(128 BYTE), "O_CAUSE_LOCATION" NUMBER, "O_CAUSE_VALUE" NUMBER, "O_PRECEDENCELEVEL" NUMBER, "O_MEDIATRANSPORTADDR_IP" NUMBER, "O_MEDIATRANSPORTADDR_PORT" NUMBER, "O_MCAP_PAYLOADCAPABILITY" NUMBER, "O_MCAP_MAXFRAMESPERPACKET" NUMBER, "O_MCAP_G723BITRATE" NUMBER, "O_VCAP_CODEC" NUMBER, "O_VCAP_BANDWIDTH" NUMBER, "O_VCAP_RESOLUTION" NUMBER, "O_VIDEOTRANSPORTADDR_IP" NUMBER, "O_VIDEOTRANSPORTADDR_PORT" NUMBER, "O_RSVPAUDIOSTAT" VARCHAR2(64 BYTE), "O_RSVPVIDEOSTAT" VARCHAR2(64 BYTE), "DESTLEGIDENTIFIER" NUMBER, "DESTNODEID" NUMBER, "DESTSPAN" NUMBER, "DESTIPADDR" NUMBER, "ORIGINALCALLEDPARTYNUMBER" VARCHAR2(50 BYTE), "FINALC_PARTYNUMBER" VARCHAR2(50 BYTE), "FINALC_PARTY_USERID" VARCHAR2(128 BYTE), "DESTCAUSE_LOCATION" NUMBER, "DESTCAUSE_VALUE" NUMBER, "DESTPRECEDENCELEVEL" NUMBER, "DESTMEDIATRANSPORTADDR_IP" NUMBER, "DESTMEDIATRANSPORTADDR_PORT" NUMBER, "DESTMCAP_PAYLOADCAPABILITY" NUMBER, "DESTMCAP_MAXFRAMESPERPACKET" NUMBER, "DESTMCAP_G723BITRATE" NUMBER, "DV_CAP_CODEC" NUMBER, "DV_CAP_BANDWIDTH" NUMBER, "DV_CAP_RESOLUTION" NUMBER, "DV_TRANSPORTADDR_IP" NUMBER, "DV_TRANSPORTADDR_PORT" NUMBER, "DESTRSVPAUDIOSTAT" VARCHAR2(64 BYTE), "DESTRSVPVIDEOSTAT" VARCHAR2(64 BYTE), "DATETIMECONNECT" NUMBER, "DATETIMEDISCONNECT" NUMBER, "LASTREDIRECTDN" VARCHAR2(50 BYTE), "PKID" VARCHAR2(4000 BYTE), "O_INALCALLEDPARTYNUM_PARTITION" VARCHAR2(50 BYTE), "CALLINGPARTYNUM_PARTITION" VARCHAR2(50 BYTE), "FINALC_PARTYNUM_PARTITION" VARCHAR2(50 BYTE), "LASTREDIRECTDNPARTITION" VARCHAR2(50 BYTE), "DURATION" NUMBER, "O_DEVICENAME" VARCHAR2(129 BYTE), "DESTDEVICENAME" VARCHAR2(129 BYTE), "O_CALLTERMINATION_BEHALF" NUMBER, "DESTCALLTERMINATION_BEHALF" NUMBER, "O_CALLEDPARTYREDIRECT_BEHALF" NUMBER, "LASTREDIRECTREDIRECT_BEHALF" NUMBER, "O_CALLEDPARTYREDIRECTREASON" NUMBER, "LASTREDIRECTREDIRECTREASON" NUMBER, "DESTCONVERSATIONID" NUMBER, "G_CALLID_CLUSTERID" VARCHAR2(50 BYTE), "JOIN_BEHALF" NUMBER, "COMMENTS" VARCHAR2(2048 BYTE), "AUTHCODEDESCRIPTION" VARCHAR2(50 BYTE), "AUTHORIZATIONLEVEL" NUMBER, "CLIENTMATTERCODE" VARCHAR2(32 BYTE), "O_DTMFMETHOD" NUMBER, "DESTDTMFMETHOD" NUMBER, "CALLSECUREDSTATUS" NUMBER, "O_CONVERSATIONID" NUMBER, "O_MCAP_BANDWIDTH" NUMBER, "DESTMCAP_BANDWIDTH" NUMBER, "AUTHORIZATIONCODEVALUE" VARCHAR2(32 BYTE), "OUTPULSEDCALLINGPARTYNUMBER" VARCHAR2(50 BYTE), "OUTPULSEDCALLEDPARTYNUMBER" VARCHAR2(50 BYTE), "O_IPV4V6ADDR" VARCHAR2(64 BYTE), "DESTIPV4V6ADDR" VARCHAR2(64 BYTE), "O_VCAP_CODEC_CHAN2" NUMBER, "O_VCAP_BANDWIDTH_CHAN2" NUMBER, "O_VCAP_RESOLUTION_CHAN2" NUMBER, "O_V_TRANSPORTADDR_IP_CHAN2" NUMBER, "O_V_TRANSPORTADDR_PORT_CHAN2" NUMBER, "O_V_OCHANNEL_ROLE_CHAN2" NUMBER, "DV_CAP_CODEC_CHAN2" NUMBER, "DV_CAP_BANDWIDTH_CHAN2" NUMBER, "DV_CAP_RESOLUTION_CHAN2" NUMBER, "DV_TRANSPORTADDR_IP_CHAN2" NUMBER, "DV_TRANSPORTADDR_PORT_CHAN2" NUMBER, "DV_CHANNEL_ROLE_CHAN2" NUMBER, "DATE_CREATED" DATE, "DATETIME_CONNECT" DATE, "DATETIME_DISCONNECT" DATE, "USERID_EMAIL_ADDRESS" VARCHAR2(100 BYTE), "FROM_FULL_TELEPHONE" VARCHAR2(20 BYTE), "TO_FULL_TELEPHONE" VARCHAR2(20 BYTE), "FROM_EXCHANGE" VARCHAR2(7 BYTE), "TO_EXCHANGE" VARCHAR2(20 BYTE), "FROM_CITY" VARCHAR2(200 BYTE), "FROM_STATE" VARCHAR2(2 BYTE), "TO_CITY" VARCHAR2(200 BYTE), "TO_STATE" VARCHAR2(2 BYTE), "CALL_TYPE" VARCHAR2(10 BYTE), CONSTRAINT "MONTHLY_BILLING_PK" PRIMARY KEY ("ID") USING INDEX PCTFREE 10 INITRANS 2 MAXTRANS 255 COMPUTE STATISTICS STORAGE(INITIAL 3145728 NEXT 1048576 MINEXTENTS 1 MAXEXTENTS 2147483645 PCTINCREASE 0 FREELISTS 1 FREELIST GROUPS 1 BUFFER_POOL DEFAULT) TABLESPACE "VOIPDATA" ENABLE ) PCTFREE 10 PCTUSED 40 INITRANS 1 MAXTRANS 255 NOCOMPRESS LOGGING STORAGE(INITIAL 75497472 NEXT 1048576 MINEXTENTS 1 MAXEXTENTS 2147483645 PCTINCREASE 0 FREELISTS 1 FREELIST GROUPS 1 BUFFER_POOL DEFAULT) TABLESPACE "VOIPDATA" ; CREATE INDEX "VOIP"."MONTHLY_BILL_INDEX1" ON "VOIP"."MONTHLY_BILLING_DETAILS" (TRUNC("DATETIME_CONNECT")) PCTFREE 10 INITRANS 2 MAXTRANS 255 COMPUTE STATISTICS STORAGE(INITIAL 4194304 NEXT 1048576 MINEXTENTS 1 MAXEXTENTS 2147483645 PCTINCREASE 0 FREELISTS 1 FREELIST GROUPS 1 BUFFER_POOL DEFAULT) TABLESPACE "VOIPDATA" ; CREATE INDEX "VOIP"."MONTHLY_BILL_INDEX10" ON "VOIP"."MONTHLY_BILLING_DETAILS" ("CALL_TYPE") PCTFREE 10 INITRANS 2 MAXTRANS 255 COMPUTE STATISTICS STORAGE(INITIAL 4194304 NEXT 1048576 MINEXTENTS 1 MAXEXTENTS 2147483645 PCTINCREASE 0 FREELISTS 1 FREELIST GROUPS 1 BUFFER_POOL DEFAULT) TABLESPACE "VOIPDATA" ; CREATE INDEX "VOIP"."MONTHLY_BILL_INDEX2" ON "VOIP"."MONTHLY_BILLING_DETAILS" ("FROM_EXCHANGE") PCTFREE 10 INITRANS 2 MAXTRANS 255 COMPUTE STATISTICS STORAGE(INITIAL 3145728 NEXT 1048576 MINEXTENTS 1 MAXEXTENTS 2147483645 PCTINCREASE 0 FREELISTS 1 FREELIST GROUPS 1 BUFFER_POOL DEFAULT) TABLESPACE "VOIPDATA" ; CREATE INDEX "VOIP"."MONTHLY_BILL_INDEX3" ON "VOIP"."MONTHLY_BILLING_DETAILS" ("FROM_FULL_TELEPHONE", TRUNC("DATETIME_CONNECT")) PCTFREE 10 INITRANS 2 MAXTRANS 255 COMPUTE STATISTICS STORAGE(INITIAL 65536 NEXT 1048576 MINEXTENTS 1 MAXEXTENTS 2147483645 PCTINCREASE 0 FREELISTS 1 FREELIST GROUPS 1 BUFFER_POOL DEFAULT) TABLESPACE "VOIPDATA" ; CREATE INDEX "VOIP"."MONTHLY_BILL_INDEX4" ON "VOIP"."MONTHLY_BILLING_DETAILS" ("DATETIME_CONNECT", NVL("FROM_FULL_TELEPHONE","CALLINGPARTYNUMBER")) PCTFREE 10 INITRANS 2 MAXTRANS 255 COMPUTE STATISTICS STORAGE(INITIAL 5242880 NEXT 1048576 MINEXTENTS 1 MAXEXTENTS 2147483645 PCTINCREASE 0 FREELISTS 1 FREELIST GROUPS 1 BUFFER_POOL DEFAULT) TABLESPACE "VOIPDATA" ; CREATE INDEX "VOIP"."MONTHLY_BILL_INDEX5" ON "VOIP"."MONTHLY_BILLING_DETAILS" ("DATETIME_CONNECT", NVL("TO_FULL_TELEPHONE","ORIGINALCALLEDPARTYNUMBER")) PCTFREE 10 INITRANS 2 MAXTRANS 255 COMPUTE STATISTICS STORAGE(INITIAL 5242880 NEXT 1048576 MINEXTENTS 1 MAXEXTENTS 2147483645 PCTINCREASE 0 FREELISTS 1 FREELIST GROUPS 1 BUFFER_POOL DEFAULT) TABLESPACE "VOIPDATA" ; CREATE INDEX "VOIP"."MONTHLY_BILL_INDEX6" ON "VOIP"."MONTHLY_BILLING_DETAILS" (TO_CHAR("DATETIME_CONNECT",'fmMONTH YYYY')) PCTFREE 10 INITRANS 2 MAXTRANS 255 COMPUTE STATISTICS STORAGE(INITIAL 4194304 NEXT 1048576 MINEXTENTS 1 MAXEXTENTS 2147483645 PCTINCREASE 0 FREELISTS 1 FREELIST GROUPS 1 BUFFER_POOL DEFAULT) TABLESPACE "VOIPDATA" ; CREATE INDEX "VOIP"."MONTHLY_BILL_INDEX7" ON "VOIP"."MONTHLY_BILLING_DETAILS" ("TO_EXCHANGE") PCTFREE 10 INITRANS 2 MAXTRANS 255 COMPUTE STATISTICS STORAGE(INITIAL 3145728 NEXT 1048576 MINEXTENTS 1 MAXEXTENTS 2147483645 PCTINCREASE 0 FREELISTS 1 FREELIST GROUPS 1 BUFFER_POOL DEFAULT) TABLESPACE "VOIPDATA" ; CREATE INDEX "VOIP"."MONTHLY_BILL_INDEX8" ON "VOIP"."MONTHLY_BILLING_DETAILS" (NVL("FROM_FULL_TELEPHONE","CALLINGPARTYNUMBER")) PCTFREE 10 INITRANS 2 MAXTRANS 255 COMPUTE STATISTICS STORAGE(INITIAL 4194304 NEXT 1048576 MINEXTENTS 1 MAXEXTENTS 2147483645 PCTINCREASE 0 FREELISTS 1 FREELIST GROUPS 1 BUFFER_POOL DEFAULT) TABLESPACE "VOIPDATA" ; CREATE INDEX "VOIP"."MONTHLY_BILL_INDEX9" ON "VOIP"."MONTHLY_BILLING_DETAILS" ("DATETIME_CONNECT") PCTFREE 10 INITRANS 2 MAXTRANS 255 COMPUTE STATISTICS STORAGE(INITIAL 3145728 NEXT 1048576 MINEXTENTS 1 MAXEXTENTS 2147483645 PCTINCREASE 0 FREELISTS 1 FREELIST GROUPS 1 BUFFER_POOL DEFAULT) TABLESPACE "VOIPDATA" ;These are the functions to determine if a phone number is assigned to multiple staffs or departments:
FUNCTION GET_EMPLOYEE_NAME (P_FROM_FULL_TELEPHONE IN VARCHAR2) RETURN VARCHAR2 AS L_NAME EMPLOYEES.NAME%TYPE; BEGIN SELECT NAME INTO L_NAME FROM EMPLOYEES WHERE WORK_PHONE_1_FORMAT = P_FROM_FULL_TELEPHONE; RETURN L_NAME; EXCEPTION WHEN TOO_MANY_ROWS THEN L_NAME := 'Multiple Employees'; RETURN L_NAME; WHEN NO_DATA_FOUND THEN L_NAME := 'No Employee Assigned'; RETURN L_NAME; WHEN OTHERS THEN NULL; END;
FUNCTION GET_DEPARTMENT_NAME (P_FROM_FULL_TELEPHONE IN VARCHAR2) RETURN VARCHAR2 AS L_DEPT_DESCR EMPLOYEES.DEPT_DESCR%TYPE; BEGIN SELECT DEPT_DESCR INTO L_DEPT_DESCR FROM EMPLOYEES WHERE WORK_PHONE_1_FORMAT = P_FROM_FULL_TELEPHONE; RETURN L_DEPT_DESCR; EXCEPTION WHEN TOO_MANY_ROWS THEN L_DEPT_DESCR := 'Multiple Departments'; RETURN L_DEPT_DESCR; WHEN NO_DATA_FOUND THEN L_DEPT_DESCR := 'No Department Assigned'; RETURN L_DEPT_DESCR; WHEN OTHERS THEN NULL; END;
This is the point of view that I'll use in the report:
CREATE OR REPLACE FORCE VIEW "VOIP"."TOP_USERS_BY_CALLS_V" ("TOP_NO", "EMPLOYEE_NAME", "EMPLOYEE_DEPARTMENT", "PHONE_NUMBER", "QUANTITY_CALLS") AS SELECT ROWNUM, VOIP_PKG.GET_EMPLOYEE_NAME(FROM_FULL_TELEPHONE), VOIP_PKG.GET_DEPARTMENT_NAME(FROM_FULL_TELEPHONE), FROM_FULL_TELEPHONE, QUANTITY_CALLS FROM ( SELECT MBD.FROM_FULL_TELEPHONE, COUNT(1) QUANTITY_CALLS FROM MONTHLY_BILLING_DETAILS MBD WHERE MBD.FROM_FULL_TELEPHONE IS NOT NULL AND MBD.FROM_FULL_TELEPHONE <> '000-000-0000' AND LENGTH(MBD.FROM_FULL_TELEPHONE) = 12 AND LENGTH(MBD.TO_FULL_TELEPHONE) = 12 AND SUBSTR(MBD.TO_FULL_TELEPHONE,1,3) NOT IN (SELECT AREA_CODE FROM NYNJ_METRO_AREA_CODES) AND SUBSTR(MBD.TO_FULL_TELEPHONE,1,3) NOT IN ('800','822','833','844', '855','866','877','888') GROUP BY MBD.FROM_FULL_TELEPHONE ORDER BY QUANTITY_CALLS DESC ) WHERE ROWNUM <= 100;Explain Plan output and Extended SQL Trace:
SQL> SQL> show parameter user_dump_dest NAME TYPE VALUE ------------------------------------ ----------- ------------------------------ user_dump_dest string D:\ORACLEHOMES\ADMIN\RTS9\UDUM P SQL> SQL> show parameter optimizer NAME TYPE VALUE ------------------------------------ ----------- ------------------------------ optimizer_dynamic_sampling integer 2 optimizer_features_enable string 10.2.0.5 optimizer_index_caching integer 0 optimizer_index_cost_adj integer 100 optimizer_mode string ALL_ROWS optimizer_secure_view_merging boolean TRUE SQL> SQL> show parameter db_file_multi NAME TYPE VALUE ------------------------------------ ----------- ------------------------------ db_file_multiblock_read_count integer 16 SQL> SQL> show parameter db_block_size NAME TYPE VALUE ------------------------------------ ----------- ------------------------------ db_block_size integer 8192 SQL> SQL> show parameter cursor_sharing NAME TYPE VALUE ------------------------------------ ----------- ------------------------------ cursor_sharing string EXACT SQL> SQL> column sname format a20 SQL> column pname format a20 SQL> column pval2 format a20 SQL> SQL> select 2 sname 3 , pname 4 , pval1 5 , pval2 6 from 7 sys.aux_stats$; SNAME PNAME PVAL1 PVAL2 -------------------- -------------------- ---------- -------------------- SYSSTATS_INFO STATUS COMPLETED SYSSTATS_INFO DSTART 02-09-2009 15:46 SYSSTATS_INFO DSTOP 02-09-2009 15:46 SYSSTATS_INFO FLAGS 1 SYSSTATS_MAIN CPUSPEEDNW 1259.6206 SYSSTATS_MAIN IOSEEKTIM 10 SYSSTATS_MAIN IOTFRSPEED 4096 SYSSTATS_MAIN SREADTIM SYSSTATS_MAIN MREADTIM SYSSTATS_MAIN CPUSPEED SYSSTATS_MAIN MBRC SYSSTATS_MAIN MAXTHR SYSSTATS_MAIN SLAVETHR 13 rows selected. Elapsed: 00:00:00.03 SQL> SQL> explain plan for 2 SELECT 3 TOP_NO, 4 EMPLOYEE_NAME, 5 EMPLOYEE_DEPARTMENT, 6 PHONE_NUMBER, 7 QUANTITY_CALLS 8 FROM 9 TOP_USERS_BY_CALLS_V 10 ORDER BY 11 QUANTITY_CALLS DESC; Explained. Elapsed: 00:00:00.18 SQL> SQL> select * from table(dbms_xplan.display); PLAN_TABLE_OUTPUT ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- Plan hash value: 826236322 ---------------------------------------------------------------------------------------------------------------- | Id | Operation | Name | Rows | Bytes | Cost (%CPU)| Time | ---------------------------------------------------------------------------------------------------------------- | 0 | SELECT STATEMENT | | 1 | 4042 | 1313 (1)| 00:00:16 | | 1 | SORT ORDER BY | | 1 | 4042 | 1313 (1)| 00:00:16 | | 2 | VIEW | TOP_USERS_BY_CALLS_V | 1 | 4042 | 1312 (1)| 00:00:16 | |* 3 | COUNT STOPKEY | | | | | | | 4 | VIEW | | 1 | 25 | 1312 (1)| 00:00:16 | |* 5 | SORT ORDER BY STOPKEY | | 1 | 26 | 1312 (1)| 00:00:16 | | 6 | HASH GROUP BY | | 1 | 26 | 1312 (1)| 00:00:16 | |* 7 | FILTER | | | | | | |* 8 | TABLE ACCESS BY INDEX ROWID| MONTHLY_BILLING_DETAILS | 1 | 26 | 1310 (1)| 00:00:16 | |* 9 | INDEX FULL SCAN | MONTHLY_BILL_INDEX3 | 934 | | 449 (1)| 00:00:06 | |* 10 | INDEX FULL SCAN | NYNJ_METRO_AREA_CODES_UK1 | 1 | 4 | 1 (0)| 00:00:01 | ---------------------------------------------------------------------------------------------------------------- Predicate Information (identified by operation id): --------------------------------------------------- 3 - filter(ROWNUM<=100) 5 - filter(ROWNUM<=100) 7 - filter( NOT EXISTS (SELECT 0 FROM VOIP."NYNJ_METRO_AREA_CODES" "NYNJ_METRO_AREA_CODES" WHERE LNNVL("AREA_CODE"<>SUBSTR(:B1,1,3)))) 8 - filter(LENGTH("MBD"."TO_FULL_TELEPHONE")=12 AND SUBSTR("MBD"."TO_FULL_TELEPHONE",1,3)<>'800' AND SUBSTR("MBD"."TO_FULL_TELEPHONE",1,3)<>'822' AND SUBSTR("MBD"."TO_FULL_TELEPHONE",1,3)<>'833' AND SUBSTR("MBD"."TO_FULL_TELEPHONE",1,3)<>'844' AND SUBSTR("MBD"."TO_FULL_TELEPHONE",1,3)<>'855' AND SUBSTR("MBD"."TO_FULL_TELEPHONE",1,3)<>'866' AND SUBSTR("MBD"."TO_FULL_TELEPHONE",1,3)<>'877' AND SUBSTR("MBD"."TO_FULL_TELEPHONE",1,3)<>'888') 9 - filter(LENGTH("MBD"."FROM_FULL_TELEPHONE")=12 AND "MBD"."FROM_FULL_TELEPHONE"<>'000-000-0000' AND "MBD"."FROM_FULL_TELEPHONE" IS NOT NULL) 10 - filter(LNNVL("AREA_CODE"<>SUBSTR(:B1,1,3))) 33 rows selected. Elapsed: 00:00:00.82 SQL> SQL> rollback; Rollback complete. Elapsed: 00:00:00.00 SQL> SQL> set autotrace traceonly arraysize 100 SQL> SQL> alter session set tracefile_identifier = 'mytrace1'; Session altered. Elapsed: 00:00:00.01 SQL> SQL> alter session set events '10046 trace name context forever, level 8'; Session altered. Elapsed: 00:00:00.15 SQL> SQL> SELECT 2 TOP_NO, 3 EMPLOYEE_NAME, 4 EMPLOYEE_DEPARTMENT, 5 PHONE_NUMBER, 6 QUANTITY_CALLS 7 FROM 8 TOP_USERS_BY_CALLS_V 9 ORDER BY 10 QUANTITY_CALLS DESC; 100 rows selected. Elapsed: 00:10:37.68 Execution Plan ---------------------------------------------------------- Plan hash value: 826236322 ---------------------------------------------------------------------------------------------------------------- | Id | Operation | Name | Rows | Bytes | Cost (%CPU)| Time | ---------------------------------------------------------------------------------------------------------------- | 0 | SELECT STATEMENT | | 1 | 4042 | 1313 (1)| 00:00:16 | | 1 | SORT ORDER BY | | 1 | 4042 | 1313 (1)| 00:00:16 | | 2 | VIEW | TOP_USERS_BY_CALLS_V | 1 | 4042 | 1312 (1)| 00:00:16 | |* 3 | COUNT STOPKEY | | | | | | | 4 | VIEW | | 1 | 25 | 1312 (1)| 00:00:16 | |* 5 | SORT ORDER BY STOPKEY | | 1 | 26 | 1312 (1)| 00:00:16 | | 6 | HASH GROUP BY | | 1 | 26 | 1312 (1)| 00:00:16 | |* 7 | FILTER | | | | | | |* 8 | TABLE ACCESS BY INDEX ROWID| MONTHLY_BILLING_DETAILS | 1 | 26 | 1310 (1)| 00:00:16 | |* 9 | INDEX FULL SCAN | MONTHLY_BILL_INDEX3 | 934 | | 449 (1)| 00:00:06 | |* 10 | INDEX FULL SCAN | NYNJ_METRO_AREA_CODES_UK1 | 1 | 4 | 1 (0)| 00:00:01 | ---------------------------------------------------------------------------------------------------------------- Predicate Information (identified by operation id): --------------------------------------------------- 3 - filter(ROWNUM<=100) 5 - filter(ROWNUM<=100) 7 - filter( NOT EXISTS (SELECT 0 FROM VOIP."NYNJ_METRO_AREA_CODES" "NYNJ_METRO_AREA_CODES" WHERE LNNVL("AREA_CODE"<>SUBSTR(:B1,1,3)))) 8 - filter(LENGTH("MBD"."TO_FULL_TELEPHONE")=12 AND SUBSTR("MBD"."TO_FULL_TELEPHONE",1,3)<>'800' AND SUBSTR("MBD"."TO_FULL_TELEPHONE",1,3)<>'822' AND SUBSTR("MBD"."TO_FULL_TELEPHONE",1,3)<>'833' AND SUBSTR("MBD"."TO_FULL_TELEPHONE",1,3)<>'844' AND SUBSTR("MBD"."TO_FULL_TELEPHONE",1,3)<>'855' AND SUBSTR("MBD"."TO_FULL_TELEPHONE",1,3)<>'866' AND SUBSTR("MBD"."TO_FULL_TELEPHONE",1,3)<>'877' AND SUBSTR("MBD"."TO_FULL_TELEPHONE",1,3)<>'888') 9 - filter(LENGTH("MBD"."FROM_FULL_TELEPHONE")=12 AND "MBD"."FROM_FULL_TELEPHONE"<>'000-000-0000' AND "MBD"."FROM_FULL_TELEPHONE" IS NOT NULL) 10 - filter(LNNVL("AREA_CODE"<>SUBSTR(:B1,1,3))) Statistics ---------------------------------------------------------- 365 recursive calls 0 db block gets 689543 consistent gets 212906 physical reads 0 redo size 5984 bytes sent via SQL*Net to client 400 bytes received via SQL*Net from client 2 SQL*Net roundtrips to/from client 2 sorts (memory) 0 sorts (disk) 100 rows processed SQL> SQL> disconnectPart of the automatic trace output:
SELECT TOP_NO, EMPLOYEE_NAME, EMPLOYEE_DEPARTMENT, PHONE_NUMBER, QUANTITY_CALLS FROM TOP_USERS_BY_CALLS_V ORDER BY QUANTITY_CALLS DESC call count cpu elapsed disk query current rows ------- ------ -------- ---------- ---------- ---------- ---------- ---------- Parse 1 0.00 0.43 0 0 0 0 Execute 1 0.00 0.00 0 0 0 0 Fetch 2 24.70 635.81 212587 631823 0 100 ------- ------ -------- ---------- ---------- ---------- ---------- ---------- total 4 24.70 636.25 212587 631823 0 100 Misses in library cache during parse: 1 Optimizer mode: ALL_ROWS Parsing user id: 148 Rows Row Source Operation ------- --------------------------------------------------- 100 SORT ORDER BY (cr=689531 pr=212900 pw=0 time=636823070 us) 100 VIEW TOP_USERS_BY_CALLS_V (cr=689531 pr=212900 pw=0 time=642681672 us) 100 COUNT STOPKEY (cr=631823 pr=212587 pw=0 time=635667026 us) 100 VIEW (cr=631823 pr=212587 pw=0 time=635666810 us) 100 SORT ORDER BY STOPKEY (cr=631823 pr=212587 pw=0 time=635666493 us) 2512 HASH GROUP BY (cr=631823 pr=212587 pw=0 time=635666125 us) 27112 FILTER (cr=631823 pr=212587 pw=0 time=519230237 us) 315563 TABLE ACCESS BY INDEX ROWID MONTHLY_BILLING_DETAILS (cr=381523 pr=212587 pw=0 time=580209555 us) 394473 INDEX FULL SCAN MONTHLY_BILL_INDEX3 (cr=2679 pr=2679 pw=0 time=26793918 us)(object id 206675) 226627 INDEX FULL SCAN NYNJ_METRO_AREA_CODES_UK1 (cr=250300 pr=0 pw=0 time=3575488 us)(object id 206605) Elapsed times include waiting on following events: Event waited on Times Max. Wait Total Waited ---------------------------------------- Waited ---------- ------------ SQL*Net message to client 2 0.00 0.00 db file sequential read 212587 0.20 611.67 SQL*Net message from client 2 0.00 0.00 SQL*Net more data to client 2 0.00 0.00 ********************************************************************************
DBMS_XPLAN. Output DISPLAY_CURSOR:
SQL> SQL> select * from table(dbms_xplan.display_cursor(null, null, 'ALLSTATS LAST')); PLAN_TABLE_OUTPUT ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- SQL_ID 1ut636vt58jdw, child number 0 ------------------------------------- SELECT /*+ gather_plan_statistics */ TOP_NO, EMPLOYEE_NAME, EMPLOYEE_DEPARTMENT, PHONE_NUMBER, QUANTITY_CALLS FROM TOP_USERS_BY_CALLS_V ORDER BY QUANTITY_CALLS DESC Plan hash value: 826236322 -------------------------------------------------------------------------------------------------------------------------------------------------------------- | Id | Operation | Name | Starts | E-Rows | A-Rows | A-Time | Buffers | Reads | OMem | 1Mem | Used-Mem | -------------------------------------------------------------------------------------------------------------------------------------------------------------- | 0 | SELECT STATEMENT | | 1 | | 100 |00:09:56.06 | 689K| 210K| | | | | 1 | SORT ORDER BY | | 1 | 1 | 100 |00:09:56.06 | 689K| 210K| 13312 | 13312 |12288 (0)| | 2 | VIEW | TOP_USERS_BY_CALLS_V | 1 | 1 | 100 |00:10:04.98 | 689K| 210K| | | | |* 3 | COUNT STOPKEY | | 1 | | 100 |00:09:54.89 | 631K| 210K| | | | | 4 | VIEW | | 1 | 1 | 100 |00:09:54.89 | 631K| 210K| | | | |* 5 | SORT ORDER BY STOPKEY | | 1 | 1 | 100 |00:09:54.88 | 631K| 210K| 6144 | 6144 | 6144 (0)| | 6 | HASH GROUP BY | | 1 | 1 | 2512 |00:09:54.88 | 631K| 210K| 821K| 821K| 1153K (0)| |* 7 | FILTER | | 1 | | 27112 |00:08:58.57 | 631K| 210K| | | | |* 8 | TABLE ACCESS BY INDEX ROWID| MONTHLY_BILLING_DETAILS | 1 | 1 | 315K|00:08:57.07 | 381K| 210K| | | | |* 9 | INDEX FULL SCAN | MONTHLY_BILL_INDEX3 | 1 | 934 | 394K|00:00:23.02 | 2679 | 2679 | | | | |* 10 | INDEX FULL SCAN | NYNJ_METRO_AREA_CODES_UK1 | 250K| 1 | 226K|00:00:03.47 | 250K| 0 | | | | -------------------------------------------------------------------------------------------------------------------------------------------------------------- Predicate Information (identified by operation id): --------------------------------------------------- 3 - filter(ROWNUM<=100) 5 - filter(ROWNUM<=100) 7 - filter( IS NULL) 8 - filter((LENGTH("MBD"."TO_FULL_TELEPHONE")=12 AND SUBSTR("MBD"."TO_FULL_TELEPHONE",1,3)<>'800' AND SUBSTR("MBD"."TO_FULL_TELEPHONE",1,3)<>'822' AND SUBSTR("MBD"."TO_FULL_TELEPHONE",1,3)<>'833' AND SUBSTR("MBD"."TO_FULL_TELEPHONE",1,3)<>'844' AND SUBSTR("MBD"."TO_FULL_TELEPHONE",1,3)<>'855' AND SUBSTR("MBD"."TO_FULL_TELEPHONE",1,3)<>'866' AND SUBSTR("MBD"."TO_FULL_TELEPHONE",1,3)<>'877' AND SUBSTR("MBD"."TO_FULL_TELEPHONE",1,3)<>'888')) 9 - filter((LENGTH("MBD"."FROM_FULL_TELEPHONE")=12 AND "MBD"."FROM_FULL_TELEPHONE"<>'000-000-0000' AND "MBD"."FROM_FULL_TELEPHONE" IS NOT NULL)) 10 - filter(LNNVL("AREA_CODE"<>SUBSTR(:B1,1,3))) 35 rows selected. Elapsed: 00:00:00.50 SQL> SQL> spool offAny help will be greatly appreciated. Please let me know if you need additional information.
Thank you
Erick
ediazjorge wrote:
Please let me know if you need additional information or do additional tests.
Thanks again!
Erick
It's to you if you are satisfied or interested in improvements (if possible).
If so the first thing I would like if you had your refreshed perspective as advised. According to expected area_code table cardinalities I doubt.
So, if not cool off with dbms_stats.gather_table_stats on two tables, area_codes and MONTHLY_BILLING_DETAILS.
Bottlenecks are now obviously the full table of MONTHLY_BILLING_DETAILS as well as the ANTI of LOOPS IMBRIQUEES scan.
At the moment I don't think that an index of MONTHLY_BILLING_DETAILS will help a lot, because most of the lines will pass filter predicates, and because we need some columns in it, I have now I there will be gain a full index scan.
I was surprissed that the optimizer pushes the substr <> predicates to both tables.
So depending on your data, you might try
1 make a factory of subquery select the two MONTHLY_BILLING_DETAILS columns that all directly apply predicates of membership and use it directly in the join instead of the table.
or
2. If all subtr to so are part of the table area_code choose in it using a subquery (or inline view) plant excluding these values.
Both are attempts to get rid of the substr excluding as filters of join predicates.
In fact, I was expecting a hash join anti as shown in the plan to explain instead of the nested loops anti, I expect to be more effective in this case.
Perhaps with correct cardinalities the optimizier would understand himself.
Just to test it, you can try the use_hash hint in the join:
Select / * + USE_HASH (MBD, one) * /.
..
OF MONTHLY_BILLING_DETAILS MBD,.
NYNJ_METRO_AREA_CODES one
(It's a good habit anyway usually use aliases and precede the names of columns. In the, it is easier to read queries are only trivial).
-
MacKeeper - stay dillymanUpd, hint
Hi guys,.
Yesterday, my wife downloaded and installed MacKeeper as soon as I got it I got it removed. But the damage has been done... I think so...
On LittleSnitch, I noticed some weird programs are connecting:
/ Library/dillymanUpd/Contents/MacOS/dillymanUpd
/ Library/hint/Contents/MacOS/hint
/private/var/tmp/BrowserEnhancer07032016/BrowserEnhancer.app/Contents/MacOS/brow serEnhancer
Never seen these google search does not know these too... What are my options...
Thank you
You have installed one or more variants of the malware ad-injection "VSearch. Please back up all data, and then take the steps below to disable it.
Do not use any type of product, "anti-virus" or "anti-malware" on a Mac. It is never necessary for her, and relying on it for protection makes you more vulnerable to attacks, not less.
Malware is constantly evolving to work around defenses against it. This procedure works now, I know. It will not work in the future. Anyone finding this comment a couple of days or more after it was published should look for a more recent discussion, or start a new one.
VSearch malware tries to hide by varying names of the files it installs. To remove it, you must first identify the naming model.
1 triple - click on the line below on this page to select, then copy the text to the Clipboard by pressing Control-C key combination:
/Library/LaunchDaemons
In the Finder, select
Go ▹ go to the folder...
from the menu bar and paste it into the box that opens by pressing command + V. You won't see what you pasted a newline being included. Press return.
A folder named "LaunchDaemons" can open. If this is the case, press the combination of keys command-2 to select the display of the list, if it is not already selected.
There should be a column in the update Finder window. Click this title two times to sort the content by date with the most recent at the top. Please don't skip this step. The files that belong to an instance of VSearch will have the same date of change within about a minute, so they will be grouped together when you sort the folder this way, which makes them easy to identify.
Search in the folder with the name of all these forms:
com.something.daemon.plist
com.something.Helper.plist
com.something .net - preferences.plist
Here, something is a string, which may be different in each instance of VSearch random meaningless. So far it has always been an alphanumeric string without punctuation signs, such as "disbalance" or "thunderbearer."
You may have more than one copy of the malware, with different values of something.
There may be one or more files with the name of this form:
com.somethingelseUpd.plist
where George can be an empty string of sense that something different. Yet once, there may be more than one file of this type, with different values of Gisele.
Here is a typical example of an infection VSearch:
com.disbalance .net - preferences.plist
com.thunderbearerUpd.plist
You will have files with similar names, but probably not identical to these.
If you feel confident that you have identified the files above, drag only the files - nothing - to the trash. You may be prompted for administrator login password. Close the Finder window.
2. open this folder as in step 1:
/Library/LaunchAgents
Move to the trash all the files with the name of the form
com.something.agent.plist
where something is one of the strings that you found in step 1. There may be not all of these files.
3. If you have whatever it is moved to the trash in step 1 and step 2, restart the computer and empty the trash.
Do not remove the folder 'LaunchAgents' or "LaunchDaemons", or anything else inside of one or the other, unless you know you have another type of unwanted software and more VSearch. Records are a normal part of Mac OS X. The terms "agent" and "demon" is a reference to a program that starts automatically. This is not inherently bad, but the mechanism is sometimes exploited by hackers for malicious software.
4 reset the home page in each of your browsers, if it has been modified. In Safari, first load the desired home page, then select
▹ Safari preferences... ▹ General
and click on
Set on the current Page
The malware is now permanently inactivated, as long as you reinstall it never. A few small files will be left behind, but they have no effect, and trying to find all them is more trouble that it's worth.
5. If you do not find the files or you are not sure about the identification, after what you have found.
If in doubt, or if you have no backups, change nothing at all.
6. the penalty may have started when you have downloaded and run an application called 'MPlayerX' or "PDF Pronto." If there is an element with a name in the Applications folder, delete it.
This Trojan horse is often found on the illegal Web sites that traffic in content such as movies pirated. If you, or anyone else who uses the computer, visit these Web sites and follow the instructions to install the software, you can expect more of the same and worse, to follow. Never install software that you downloaded from a bittorrent, or which has been downloaded by someone else from an unknown source.
In the aspect of security & confidentiality of system preferences, select the general tab. The marked anywhere radio button should not be selected. If this is the case, click the lock icon to unlock the settings, and then select an other keys. After that, do not ignore a warning that you are about to run or install an application from an unknown Director.
Then, still in system preferences, open the pane of the App Store or software update and check the box marked
Install the system data files and security updates (OS X 10.10 or later version)
or
Automatically download the updates (OS X 10.9 or earlier version)
If it is not already done.
-
How to turn off the hint (to save the battery?)
I found that even when you take advice from your ear, it consumes battery quite quickly. My index was flat about 8-9 hours later, even though she was just sitting on the table. How long should take when it is lying on the desk? Is it possible to cut further? I think that it is because Hint arrived new out of the box, that it is 'off', but after just a second to load through the case, I took it out and he said "more than 3 hours of talk time"
Hi jonstatt,
in order to disable the suspicion of the bike, you just put it in its case. The maximum waiting time is 100 hours.
Fabio
-
Is it possible to wrap the text in the cells of a Table Hint?
I have read the contents of an Excel file in a Table Hint and want to wrap the text in some cells.
You can do this - sort of...
LV do not wrap auto the contents of a cell automatically. However, if there are hard line breaks, you can make the LV expand the cell vertically to display all rows. It will not however, size autoutomatically width of the cell.
Sounds like it may be a good project for an XControl.
Mike...
-
Highlight the row in a table hint
Hello!
I'm evaluating the LabVIEW and try to do a few simple steps. Now, I have a table hint that contains all the values of frequency of 50-60. I need to calibrate for each frequency, and I would like to insist on each row of the table. Well, I use SelSize and SelStart property nodes, and it works very well the selected line is displayed. But I have only about 20 lines visible, and to see the rest I need to scroll through the table. How to change the position of scroll programmatically? Or maybe you can suggest the best way to highlight the lines?
Found the solution: the IndexVals property node defines the line/column numbers to be displayed in the upper left corner of the table hint.
Kudo goes to AndrewAlford for his reply in this topic:
http://forums.NI.com/T5/LabVIEW/highlight-a-row-in-table/m-p/320036#M165245
-
How to read data from the cell of the table hint?
In my application, I filled the table hint with database data. Now I want, when I click on any particular line, I should be able to read the data in this row.
Thank you best regards &,.
Shrinivas
Strange, I can see it with different accounts.
OK, the VI attached.
Christian
-
Forgotten password to log on to the computer and have not set a hint.
This is for windows XP
son put password on the machine and don't remember the password that he did not set a hint. I have no idea where to start to log in and access the machine.
Remember - this is a public forum so never post private information such as numbers of mail or telephone!
If you use NTpasswd, you ignored the password for the built-in Administrator and would be able to connect, assuming that there is no other weird issue with Windows. You would not certainly use 'administrator' or something for a password. If you still can't, you do not use NTpasswd correctly. Try again and read the instructions carefully.
That said, with second-hand computers, your first step is to do a clean install a factory so connection restore becomes useless.
http://michaelstevenstech.com/cleanxpinstall.html - Clean install - how-to
http://www.elephantboycomputers.com/page2.html#Reinstalling_Windows - you will need at hand MS - MVP - Elephant Boy computers - Don ' t Panic! -
How can I change my password hint?
Using Windows Vista update 2. PowerSpec pc.
I can't find out how to change my password administrator index. Does anyone have the answer?
Using Windows Vista update 2. PowerSpec pc.
I can't find out how to change my password administrator index. Does anyone have the answer?
Have you tried?
http://Windows.Microsoft.com/en-pH/Windows-Vista/create-or-change-a-password-hint
-
How do you get access to your computer when you forgot your password and hint question
My mother did not use his computer for a while and forgot his password and hint question. Is there anyway to get into the computer without them? She has a Toshiba laptop with Windows Vista installed on it. Thank you.
Hello
I'm sorry, but the strategy of microsoft in these forums is that without assistance will be given about lost or forgotten passwords
read the policy at the link below
I suggest you reinstall vista
-
connect password HINT in Windows vista
I forgot my password of connection in Windows vista. How to get to the password hint?
http://support.Microsoft.com/default.aspx/KB/189126
"Microsoft's strategy concerning lost or forgotten passwords"
Microsoft cannot help you recover the passwords of the files and Microsoft who are lost or forgotten product features. Mick Murphy - Microsoft partner
-
DB version: 11.2.0.4 on Linux/Unix
I read that when you use APPEND hint, it uses direct-path INSERT that "data is added at the end of the table", rather than using existing space currently allocated to the table.
What does "data are added at the end of the table"? These data are written above the HWM?
> What is these medium-sized data is written above the HWM?
Exactly,.
-
NOCOPY Hint in a SYS_REFCURSOR.
I hava a procedure with a parameter of output SYS_REFCURSOR and there is a warning that I can take advantage of a NOCOPY HINT.
Isn't the REF CURSOR already a reference? What would be the real advantage in terms of performance by adopting such a suggestion?
Thanks in advance.
It's the PLW-07203 warning that apears after a compilation in a session with:
ALTER SESSION SET PLSQL_WARNINGS = ' ENABLE: ALL ';
'Parameter 'chain' likely to benefit from the use of the NOCOPY compiler flag.
http://docs.Oracle.com/CD/B28359_01/server.111/b28278/plwus.htm#PLW-07203
Don't know, but it's probably just a warning of 'catch-all '.
REF CURSOR is pointers, so no matter how it happened, you can still have multiple pointers to the same location and risk having the problem of "aliasing" described in the doc:
http://docs.Oracle.com/CD/E11882_01/AppDev.112/e25519/subprograms.htm#CHDEBECB
Subprogramme parameter Aliasing with variable cursor parameters
Cursor variables are pointers. Therefore, if a subroutine assigns a parameter variable cursor to another, they refer to the same memory location. This folding can have unexpected results.
In the example 8-19, the procedure has two variable slider settings,
emp_cv1andemp_cv2. The procedure opensemp_cv1and sets its value (which is a pointer) toemp_cv2. Nowemp_cv1andemp_cv2refer to the same memory location. When the procedure endsemp_cv1, it also closesemp_cv2. Therefore, when the procedure is trying to get toemp_cv2, PL/SQL raises an exception.Example 8-19 parameters sub-program Variable Cursor alias
A cursor is NOT given, so copying is not accomplish the type of separation that makes copy of data.
If you copy data, then you have TWO copies of the data. A change to each copy will NOT change the other copy.
As shown in example 8-19 in this doc copy that a cursor does not copy any data - it provides just TWO paths to it.
-
Wie kann ich can reach, das beim vergrossern mit dem das Bild nicht hinter Paletten rutscht die Zoom-tool?
Please reset the Photoshop preferences
Go to Photoshop > preferences > General
Click Preferences to Reset on Quit
~ Assani
Maybe you are looking for
-
How to import bookmarks to Firefox Firefox OSX Win7?
How to import bookmarks from Win7 to my firefox OSX?
-
as soon as I open firefox the little color wheel appears and I can't do anything, how can I fix?
Once I open firefox the wheel little colored appears (which is called?) and does not do anything else. I uninstalled and reinstalled, but the problem persists. I would try the reset option, but the color wheel preventing from doing anything on Firefo
-
I got several dvds made from old videos. I'm reading on my g6 pavillion. I have no video or audio.
-
Connectivity issues after upgrade to 6.5.0 remotely
Hello After the upgrade to 6.5.0 I had naturally create and update an account MyNetgear to use ReadyCloud on our 2 NAS boxes. At the beginning it was a headache because he beat absolutely all remote access (as others in the forum mentioned). However,
-
Hello everyone, my PDF files changed to Null... For example if the name of my file was e3 is now Null.e3 and adobe reader and Foxit Reader cannot open my files. ?