MVIEWs or PLSQL?

Hey people,

I was just wondering about the MVIEWs and thought I can't I just use a merge statement instead to create a refreshing MVIEW it. Consider that I have my refreshment as FINISHED in one of my MVIEW, why don't I have just use a PLSQL block with truncation (considering my atomicity is set to false in my MVIEW) and insert it into a table heap instead of use the MVIEW?

Have we not no particular reason for creation of MVIEW can we do it using PLSQL? and that's why we go to MVIEWs?

Thank you

Yes, that's what I mean.

If your table employees is 'small', Oracle may decide not to rewrite the query, but it is the general principle

Tags: Database

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measure the plsql runtime
Hello dear teachers,
I would be gratful for advice.
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Hello
I'm having a hard time to reverse the difference between my role model and my fusion database schema.
The initial goal is simple:
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2 / I SDDM to generate the DDL change code
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Interesting. Looks like you're it's partitioning that is causing the problem.

In a model, partitioning information can be held on the objects of physical model for Tables and materialized views.

In the case where a Table and materialized views are linked together (by the implementation as a Materialized View on physical model Table property), it is information of partitioning that is held on the Table which is relevant. The information on the Table is used when generating DDL. And in an import or synchronize, partitioning information are added to the Table object.

I think that what is happening in your case probably is your model includes some details of partitioning maintained on the Materialized View object.

Synchronization is combining the details of your database partition to the Table in the model.

As it does not associate the details of partition of your database with the materialized view in the model object, the comparison shows a difference for the materialized view:-not partitioned in database, but partitioned in your model. And this difference is causing the drop and re-create the view materialized in the DDL.

There are various options to work around this:

1. you can remove details unnecessary partitioning and maintained on the view materialized in your model object.

2. you can clear the check box for the entry for materialized views in the tree in the dialog box models to compare before making the DOF preview. (But it also means that no DDL will be generated for all other differences in these materialized views).

3. you can use the filter properties to filter the relevant properties (e.g., partitioned, partitioning columns and Subpart columns for Materialized View objects), and then select the button refresh trees before performing the DOF preview. (See the screenshot below).

David

boards of opt_estimate in the merge of refresh operations quick mview

Hello
in a system (Oracle 11 g Enterprise Edition Release 11.2.0.2.0 - 64 bit Production database) I'm trying to optimize, there are materialized views with "fast refresh on commit" and there are many queries to the following distribution:
/ * MV_REFRESH (MRG) * / MERGE INTO "XXX". "" WITH THE HELP OF YYY "" SNA$ ' (SELECT / * + OPT_ESTIMATE (QUERY_BLOCK MAX = 485387) * /...)
"As far as I can see the queries show the structure explained in Alberto Dell's Oracle blog'Era ' quick refreshment of only materialized aggregate views with SUM - algorithm (in the section" Refresh for mixed-DML TMPDLT") - the best resource on refresh mview algorithms I know. But I could not find information on the setting of the OPT_ESTIMATE indicator. In the database, I see that the values in the indicator are changing:

Select st.sql_id

, substr (st.sql_text, instr (st.sql_text, 'OPT_ESTIMATE'), 40) sql_text

St dba_hist_sqltext

where st.sql_text like ' / * MV_REFRESH (MRG) * / MERGE INTO "XXX". » YYY » %'

and...

SQL_ID SQL_TEXT

------------- ----------------------------------------

6by5cwg0v6zaf OPT_ESTIMATE (QUERY_BLOCK MAX = 485387) *.

2b5rth5uxmaa2 OPT_ESTIMATE (QUERY_BLOCK MAX = 485387) *.

4kqc15tb2hvut OPT_ESTIMATE (QUERY_BLOCK MAX = 490174) *.

fyp1rn4qvxcdb OPT_ESTIMATE (QUERY_BLOCK MAX = 490174) *.

a5drp0m9wt53k OPT_ESTIMATE (QUERY_BLOCK MAX = 407399) *.

2dcmwg992pjaz OPT_ESTIMATE (QUERY_BLOCK MAX = 485272) *.

971zzvq5bdkx6 OPT_ESTIMATE (QUERY_BLOCK MAX = 493572) *.

46434kbmudkq7 OPT_ESTIMATE (QUERY_BLOCK MAX = 493572) *.

4ukc8yj73a3h3 OPT_ESTIMATE (QUERY_BLOCK MAX = 491807) *.

8k46kpy4zvy96 OPT_ESTIMATE (QUERY_BLOCK MAX = 491807) *.

3h1n5db3vdugt OPT_ESTIMATE (QUERY_BLOCK MAX = 493547) *.

5340ukdznyqr6 OPT_ESTIMATE (QUERY_BLOCK MAX = 493547) *.

7fxhdph8ymyz8 OPT_ESTIMATE (QUERY_BLOCK MAX = 407399) *.

15f3st5gdvwp3 OPT_ESTIMATE (QUERY_BLOCK MAX = 491007) *.

083ntxzh8wnhg OPT_ESTIMATE (QUERY_BLOCK MAX = 491007) *.

cg17yjx3qay5z OPT_ESTIMATE (QUERY_BLOCK MAX = 491452) *.

5qt37uzwrwkgw OPT_ESTIMATE (QUERY_BLOCK MAX = 491452) *.

byzfcg7vvj859 OPT_ESTIMATE (QUERY_BLOCK MAX = 485272) *.

aqtdpak3636y5 OPT_ESTIMATE (QUERY_BLOCK MAX = 493572) *.

dcrkruvsgpz3u OPT_ESTIMATE (QUERY_BLOCK MAX = 492226) *.

7mmt5px6sd7xg OPT_ESTIMATE (QUERY_BLOCK MAX = 492226) *.

9c6v714pbjvc0 OPT_ESTIMATE (QUERY_BLOCK MAX = 485336) *.

fbpsz02yq2qxv OPT_ESTIMATE (QUERY_BLOCK MAX = 485336) *.

0q04g2rh9j84y OPT_ESTIMATE (QUERY_BLOCK MAX = 491217) *.

gp3u5d5702dpb OPT_ESTIMATE (QUERY_BLOCK MAX = 491638) *.

9f35swtju24aa OPT_ESTIMATE (QUERY_BLOCK MAX = 491638) *.

a70jwxnrxtfjn OPT_ESTIMATE (QUERY_BLOCK MAX = 491217) *.

93mbf02cjq2ny OPT_ESTIMATE (QUERY_BLOCK MAX = 491217) *.

Then of course the cardinalities in the OPT_ESTIMATE indication are not static here and the sql_id of foreign exchange as a result. And this change prevents me from using the basic lines of sql plan to gurantee a stable path (essentially to avoid the parallel operations for refresh, well operations that Parallels access for queries do not prevent). I did a quick check with 11.2.0.1 and see the same model here:

drop materialized view t_mv;

drop table t;

create table t

as

Select rownum id

, mod (rownum, 50) col1

, mod (rownum, 10) col2

, lpad ('* ', 50,' *') col3

of the double

connect by level < = 100000;

exec dbms_stats.gather_table_stats (user, 't')

Create materialized view log on t with rowid (id, col1, col2, col3) including the new values;

Create materialized view t_mv

quickly refresh on validation

as

Select col1

sum (col2) sum_col2

count (*) NTC

count (col2) cnt_col2

t

Col1 group;

Update t set col2 = 0 where col1 = 1;

commit;

SQL_ID, 4gnafjwyvs79v, number of children 0

-------------------------------------

/ * MV_REFRESH (MRG) * / MERGE IN 'TEST '. "" T_MV ""$SNA"WITH THE HELP OF SELECT (SELECT

/ * + OPT_ESTIMATE (QUERY_BLOCK MAX = 1000) * / "DLT$ 0. "" COL1 ""GB0. "

SUM (DECODE ("DLT$ 0". "DML$ $"(, 'I', 1,-1) * DECODE ("DLT ($0". " ("" COL2 ").

(NULL, 0, 1)) 'D0', SUM (DECODE ("DLT$ 0". "DML$ $"(, 'I', 1,-1)) 'D1', "

NVL (SUM (DECODE ("DLT$ 0". "DML$ $"(, 'I', 1,-1) * ("DLT$ 0". " ((("" COL2 ")), 0)

'D2' FROM (SELECT CHARTOROWID (' MAS$ ".)) ("' M_ROW$ $') RID$,.

"MAS$". " "COL1", "MAS$". "' COL2 ', DECODE (" MAS$ ".) OLD_NEW$ $, 'N', ' (I ' 'd').

DML$ $, "MAS$". "" DMLTYPE$ $"" DMLTYPE$ $', 'TEST '. "" MLOG$ _T "" MAS$ ".

WHERE "MAS$". XID$ $ =: 1) 'DLT$ 0' GROUP BY 'DLT$ 0. ("' COL1 ')" AV$ "ON

(SYS_OP_MAP_NONNULL ("SNA$".)) ("' COL1 ') = SYS_OP_MAP_NONNULL (" AV$ ".) (("" GB0 '))

WHEN MATCHED THEN UPDATE SET "SNA$". "CNT_COL2"= "$SNA". «CNT_COL2 "+" AV$ ".»

'D0', '$SNA '. "CNT"= "$SNA". «CNT "+" AV$ ".» "' D1 ',.

"SNA$". " SUM_COL2 "= DECODE (" SNA$ "". ")" CNT_COL2 "+" AV$ ".» D0', 0, NULL, NVL ("SNA$".)

("SUM_COL2", 0) + AV$ «» ("' D2 ') DELETE WHERE (" SNA$ ".) ("' CNT ' = 0) IS NOT

MATCHED THEN INSERT ("SNA$".) "" COL1 ","$SNA ". "" CNT_COL2 ","$SNA ". "" CNT ",.

Hash value of plan: 2085662248

-----------------------------------------------------------------------------------

| ID | Operation | Name | Lines | Bytes | Cost (% CPU). Time |

-----------------------------------------------------------------------------------

|   0 | MERGE STATEMENT |         |       |       |    24 (100) |          |

|   1. MERGE | T_MV |       |       |            |          |

|   2.   VIEW                  |         |       |       |            |          |

|* 3 |    OUTER HASH JOIN |         |    40. 4640 |    24 (9) | 00:00:01 |

|   4.     VIEW                |         |    40. 2080.    20 (5) | 00:00:01 |

|   5.      GROUP SORT BY |         |    40. 1640 |    20 (5) | 00:00:01 |

|* 6 |       TABLE ACCESS FULL | MLOG$ _T |    40. 1640 |    19 (0) | 00:00:01 |

|   7.     MAT_VIEW FULL ACCESS | T_MV |    50. 3200 |     3 (0) | 00:00:01 |

-----------------------------------------------------------------------------------

Information of predicates (identified by the operation identity card):

---------------------------------------------------

3 - access (SYS_OP_MAP_NONNULL ("SNA$".)) ("' COL1 ') = SYS_OP_MAP_NONNULL (" AV$ ".) "G

B0'))

6 - filter("MAS$".") XID$ $"(=:1)"

Note

-----

-dynamic sample used for this survey (level = 2)

So I see an OPT_ESTIMATE (QUERY_BLOCK MAX = 1000) and this estimate seems to be fairly stable when I change the number of lines, number of blocks, use partitioning etc. I checked a trace with Event 10046 but didn't source the value 1000. I also disabled the comments of cardinality ("_optimizer_use_feedback" = false) and there is no profile sql in my system (according to dba_sql_profiles) - but the OPT_ESTIMATE is still there.
So the question is: is there something known about values used in the OPT_ESTIMATE indication for the materialized view fast refresh operations? Thanks in advance for your contributions.
Concerning
Martin Preiss

Martin Preiss wrote:

In regard to point 1: initially as a partitioned table starting with K 1000 lines, then 100K, then 10K, I created my test T table (using my old example of Blog Oracle MP: Materialized View Fast refresh): in all cases, I got OPT_ESTIMATE (QUERY_BLOCK MAX = 1000). My first problem in this context is that I did not come with a model showing different OPT_ESTIMATE values - as I see them in the prod system.

Using the sql Profiler and the force_match option looks promising - I'll check if I can use them here.

Concerning

Martin

Hi Martin,

but perhaps the OPT_ESTIMATE indicator is based on stats of the MLOG or MV table, where my question. Since this is the option to 'MAX' of OPT_ESTIMATE (limit the maximum number of rows for this query block) the 1000 resembles 'low' default value is used if the stats are missing or the MLOG / MV table less than 1000 lines?

Randolf

VARRAY in plsql

Hi Experts,
What is the best way to use varray plsql loop to achieve this
```
account1  date1  account1  balance_1
a1        1-jan-2016   s1    100
a1        1-jan-2016   s2    200
a1        2-jan-2016   s1    300
a1        2-jan-2016   s2    400
a1        3-jan-2016   s1    500
a1        3-jan-2016   s2    600
```
expected results
```
account1  date1  account1  balance_1
a1        1-jan-2016   s1    100
a1        2-jan-2016   s1    100+300   
a1        3-jan-2016   s1    100+300+500
```
```
a1        1-jan-2016   s2    200
a1        2-jan-2016   s2    200+400
a1        3-jan-2016   s2    200+400+600
```
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A written file afiedt.buf

1 with testdata (date1, Account2, account1, balance) as)
2 Select 'a1', date ' 2016-01-01', 's1', 100 double Union all
3 select 'a1', date ' 2016-01-01', 's2', 200 double Union all
4 Select 'a1', date "2016-01-02', 's1', 300 double Union all
5 Select 'a1', date ' 2016-01-02', 's2', 400 double Union all
6 select 'a1', date ' 2016-01-03', 's1', 500 double Union all
7 select 'a1', date ' 2016-01-03', 's2', 600 of the double
8        )
9 --
10. Select date1 account1, Account2, balance_string
11, to_number (x.column_value) as balance
12 years of)
13. Select account1
14, date1
15, Account2
16, trim ('+ ' sys_connect_by_path(balance,'+')) as balance_string
17 testdata
18 connection of account1 = account1 prior
19 and Account2 = Account2 prior
20 and date1 = date1 prior + 1
21 to begin with (account1, Account2, date1) (select account1, Account2, min (date1)
22 of testdata
23 account1, Account2)
24       )
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SQL > /.

DATE1 AC BALANCE_STRING AC BALANCE
-- ----------- -- -------------------- ----------
A1 1 January 2016 s1 100 100
A1 2 January 2016 s1 100 + 300 400
S1 3 January 2016 a1 100 + 300 + 500 900
A1 1 January 2016 s2 200 200
A1 2 January 2016 s2 200 + 400 600
A1 3 January 2016 s2 200 + 400 + 600-1200

6 selected lines.

Or more simply (I don't think I tried to analytical functions in a connect by clause before, but it seems to work ok)...

SQL > ed
A written file afiedt.buf

1 with testdata (date1, Account2, account1, balance) as)
2 Select 'a1', date ' 2016-01-01', 's1', 100 double Union all
3 select 'a1', date ' 2016-01-01', 's2', 200 double Union all
4 Select 'a1', date "2016-01-02', 's1', 300 double Union all
5 Select 'a1', date ' 2016-01-02', 's2', 400 double Union all
6 select 'a1', date ' 2016-01-03', 's1', 500 double Union all
7 select 'a1', date ' 2016-01-03', 's2', 600 of the double
8        )
9 --
10. Select account1
11, date1
12, Account2
13, trim ('+ ' sys_connect_by_path(balance,'+')) as balance_string
14, sum (balance) over (partition of account1, Account2 date1 order) as the balance
15 of testdata
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17 and Account2 = Account2 prior

18 and date1 = date1 prior + 1
19 start with (account1, Account2, date1) (select account1, Account2, min (date1)
20 of testdata
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DATE1 AC BALANCE_STRING AC BALANCE
-- ----------- -- -------------------- ----------
A1 1 January 2016 s1 100 100
A1 2 January 2016 s1 100 + 300 400
S1 3 January 2016 a1 100 + 300 + 500 900
A1 1 January 2016 s2 200 200
A1 2 January 2016 s2 200 + 400 600
A1 3 January 2016 s2 200 + 400 + 600-1200

6 selected lines.

PLSQL block does not run

Hi all
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create or replace procedure sma
is
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loop
extract the c4 inside;
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PYM

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Hi all
I have a question about logs mview.
While analyzing my AWR reports I found that most of the query at the top of the page are on my logs MView. How to optimize these queries?
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We use a server Oracle 11 GR 2.
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You can follow this doc for you reference

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Hi experts,
Could you please help with the following requirement. I have the tags xml (.xml on a server file) below. I need to access this file and read the XML and insert into the db table using sql and plsql. Is it possible with the cdata below? And there is a nested this table.
Could someone please guide me if you have a sample code file and xml.
<? XML version = "1.0" encoding = "UTF-8"? >
< generation_date > <! [CDATA [17/11/2015]] > < / generation_date >
< generated_by > <! [CDATA [Admin Admin]] > < / generated_by >
< year > <! [CDATA [2015]] > < / year >
< month > <! [CDATA [01]] > < / month >
< author >
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< price > <! [CDATA [250]] > < / price >
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XMLTABLE using...

SQL > ed
A written file afiedt.buf

1 with t (xml) as (select xmltype ('))
2
3
4
5
6
7
8
9
10
11
[[12 [email protected]]] >
13
14
15
16
17
18
19

20
21
22
23
24
25
26
27
28
29
30
31
32
33 ") of the double)"
34-

35 end of sample data
36-
37 - assumptions:
(38 - a) XML may have several tags
(39 - b) each may contain more
40-
41 select x.gen_by, x.gen_date, x.mn, x.yr
42, y.author, y.auth_fn, y.auth_ln, y.auth_cnt, y.auth_em, y.auth_d1, y.auth_d2
43, z.id, z.pub, z.sec, z.iss_dt, z.pg, z.art_ttl, z.num_wrds, z.oprice, z.ocurr, z.price, z.curr
44 t
45, xmltable ('/ authxml')
from $ 46 t.xml
path of 47 columns gen_date varchar2 (10) '. / generation_date'
48, path of varchar2 (15) of gen_by '. / generated_by'
49, path of varchar2 (4) year '. "/ year"
50 varchar2 (2) mn road '. "/ month"
51, path of xmltype authors '.'
52                 ) x
53, xmltable ('/ authxml/authors ')
from $ 54 x.authors
author of 55 path of varchar2 columns (15) '. / author'
56, path of varchar2 (10) of auth_fn '. / author_firstname'
57, path of varchar2 (10) of auth_ln '. / author_lastname'
58 road of VARCHAR2 (3) auth_cnt '. / author_country'
59 road of varchar2 (20) of auth_em '. / author_email'
60 road of varchar2 (5) of auth_d1 '. / author_data_01'
61, path of varchar2 (5) of auth_d2 '. / author_data_02'
62, path of xmltype articles '. / Articles'
63                 ) y
64, xmltable ('/ Articles/article_item ')
from $ 65 y.articles
path id 66 number columns '. / article_id'
67, path of varchar2 (10) pub '. ' / publication.
68 road of varchar2 (10) dry '. / section'
69, path of varchar2 (10) of iss_dt '. / issue_date'
70 road of VARCHAR2 (3) pg '. "/ print this page"
71, path of varchar2 (20) of art_ttl '. / article_title'
72, path of varchar2 (5) of num_wrds '. / number_of_words'
73, path of varchar2 (5) of oprice '. / original_price'
74 road to VARCHAR2 (3) ocurr '. / original_price_currency'
75, path of varchar2 (5) price '. "/ price"
76, path of VARCHAR2 (3) curr '. / price_currency'
77*                ) z
SQL > /.

GEN_DATE GEN_BY YEAR MN AUTHOR AUTH_FN AUTH_LN AUT AUTH_EM AUTH_ AUTH_ ID PUB DRY ISS_DT PG ART_TTL NUM_W OPRIC HEARTS PRICE OCU
---------- --------------- ---- -- --------------- ---------- ---------- --- -------------------- ----- ----- ---------- ---------- ---------- ---------- --- -------------------- ----- ----- --- ----- ---
17/11/2015 Admin Admin 2015 01 user author user author [email protected] 123456 UAE Al Bayan Local 11/11/2015 2 is the title.   165 200 AED AED 250

Of course, you'll want to change the types of data, etc. as needed.

I assumed that the XML can contain several "" sections and that each section can contain several entries.

Thus the XMLTABLE aliasing as 'x' gives information of XML, and supplies the data associated with the XMLTABLE with alias 'y' which gets the multiple authors, which itself section of the XMLTABLE with alias 'z' for each of the article_item.

CDATA stuff are handled automatically by SQLX (XML functionality integrated into Oracle's SQL)

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I have an external PLSQL procedure that dynamically creates a report out of the HTML tags that I then called an anonymous block APEX PLSQL. I'm making bad images with the following code:
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....

' < style td = "width: auto;" "padding: 0px 5px 0px ' > '. spc_rec. SPC_VIABILITY_STATUS. "< table > ' |

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TD > < img src = "" #IMAGE_PREFIX #check2.gif "alt =" "/ > < table > '"

....

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PaulP

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Kind regards

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In plsql fetch and buckle, what is the difference between these 2 statements? Does make a difference when or the other of the Sub lines take precedence over the other?

OPEN email_details_cur (p_transactionid);

LOOP

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