What is the difference between the Group and join?
I understand what is the grouping of contacts. and I saw the impact of joinging contacts but why would I do that? He takes the contacts that join off the my list of good contacts individuals list is deleted and all that remains is the name of the principal that joined you.
Why do this?
If you have the same contact in more than one group of Gmail, the droid will join them together. This prevents duplicates appear in the contacts list.
Tags: Motorola Phones
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Need help in the optimization of the query with the Group and joins by clause
I'm having the problem by running the following query... It takes a lot of time. To simplify, I added the two tables FILE_STATUS = stores the file load details and COMM table Board table job showing records treated successfully and which was communicated to the other system real. Records with status = T is trasnmitted to another system and traansactions with P is waiting.
Here's the query I wrote to give me the details of the file that has been loaded into the system. He reads the table of State and the commission files to display the name of the file, total records loaded, total at the table of the commission and the number of records which has finally been passed successfully loaded (Status = T) with other systems.CREATE TABLE FILE_STATUS (FILE_ID VARCHAR2(14), FILE_NAME VARCHAR2(20), CARR_CD VARCHAR2(5), TOT_REC NUMBER, TOT_SUCC NUMBER); CREATE TABLE COMM (SRC_FILE_ID VARCHAR2(14), REC_ID NUMBER, STATUS CHAR(1)); INSERT INTO FILE_STATUS VALUES ('12345678', 'CM_LIBM.TXT', 'LIBM', 5, 4); INSERT INTO FILE_STATUS VALUES ('12345679', 'CM_HIPNT.TXT', 'HIPNT', 4, 0); INSERT INTO COMM VALUES ('12345678', 1, 'T'); INSERT INTO COMM VALUES ('12345678', 3, 'T'); INSERT INTO COMM VALUES ('12345678', 4, 'P'); INSERT INTO COMM VALUES ('12345678', 5, 'P'); COMMIT;
In production, this request has several joins and takes a long time to deal with... the main culprit for me is the join on the COMM table to count the number of number of transactions sent. Please can you give me tips to optimize this query to get results faster? What I need to delete the Group and use the partition or something else. Help, please!SELECT FS.CARR_CD ,FS.FILE_NAME ,FS.FILE_ID ,FS.TOT_REC ,FS.TOT_SUCC ,NVL(C.TOT_TRANS, 0) TOT_TRANS FROM FILE_STATUS FS LEFT JOIN ( SELECT SRC_FILE_ID, COUNT(*) TOT_TRANS FROM COMM WHERE STATUS = 'T' GROUP BY SRC_FILE_ID ) C ON C.SRC_FILE_ID = FS.FILE_ID WHERE FILE_ID = '12345678';
Don't know if it will be faster based on the information provided, but analytical functions offer an alternative approach;
select carr_cd, file_name, file_id, tot_rec, tot_succ, tot_trans from (select fs.carr_cd, fs.file_name, fs.file_id, fs.tot_rec, fs.tot_succ, count(case when c.status = 'T' then 1 else null end) over(partition by c.src_file_id) tot_trans, row_number() over(partition by c.src_file_id order by null) rn from file_status fs left join comm c on c.src_file_id = fs.file_id where file_id = '12345678') where rn = 1; CARR_CD FILE_NAME FILE_ID TOT_REC TOT_SUCC TOT_TRANS ------- -------------------- -------------- ---------- ---------- ---------- LIBM CM_LIBM.TXT 12345678 5 4 2
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Consider the case below;
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Hope your first confusion is clear now.
And a more complex thing to maximum rates:
Virtual machines per host: 512
Number of hosts per cluster: 32
Therefore, the cluster may be Virtual Machines (maximum): 521 * 32 = 16384
But in the document, we have only 4000 VMs in maximum.
Why?
This means that even if you have 32 Guest and each host can accommodate 512 VMs each the maximum number of virtual machines per cluster may not exceed 4000. And it does not mean that you can have a maximum of VMS (512 * 32).
~ dGeorgey
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Pls explain me what is the difference between the groups and the organization unit in simple terms with an example in real time.
Hello
https://en.Wikipedia.org/wiki/Organizational_unit _ (computing)
https://en.Wikipedia.org/wiki/Group _ (computing)
See you soon.
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