Regarding use of DDL in PL/SQL
Hai,
Can someone help me in understanding why we can't use DDLs in PL/SQL.
I will be really thankful to you.
Gursimran
> Can someone help me in understanding why we can't use DDLs in PL/SQL.
A simple analogy.
A DDL is like a recipe to make a meal. PL/SQL (Oracle) is like the kitchen in a restaurant.
What works best? Having an excellent menu of choice meals - having the kitchen work from a fixed list of known recipes?
Or allowing diners to sit down at a table, think about what they will like, and then supplying the kitchen with a "dynamic" recipe to prepare that meal?
The kitchen will have a problem coping with dynamic recipes. It may not have the right ingredient. It may not have sufficient ingredients. A single recipe may need to use the flame griller for an extended period of time, which means no other meals can be made while that recipe's meal is made. Etc.
Dynamically creating objects, or changing objects (all done via DDLs) is like a dynamic recipe. It may work. It may not work. Depends on whether other processes are using (locking) resources required to complete that DDL. It also means that code cannot refer to this object as it does not exist yet - it will only exist at some point of time while the code is busy running.
This is not a sensible approach. Yes, there are exceptions to this.. but exceptions are just that. Exceptions that is not the norm and not the standard.
There is no need to DDLs in PL/SQL 99% of the time. And that remaining 1% needs to be carefully looked at to determine whether it is indeed an exception.
The Oracle Kitchen works best when the meals to be made is from a known menu.
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Hi
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begin
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l_elapsed number;
n number;
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select to_char(sysdate, 'sssssss')
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Consider using the NOCOPY hints for your parameters
to use pointers instead of copying values. NOCOPY
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Don't do anything in loops that does not have to be
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The on-line documentation has suggested that using a
DETERMINISTIC function can improve performance but I
have not been able to demonstrate this and there are
notes in Metalink suggesting that this does not
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functions always get executed. There's supposed to
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Managing statistics for object collections used as table types in SQL
Hi All,
Is there a way to manage statistics for collections used as table types in SQL.
Below is my test case
Oracle Version :
SQL> select * from v$version;
BANNER
Oracle Database 11g Enterprise Edition Release 11.2.0.3.0 - 64bit Production
PL/SQL Release 11.2.0.3.0 - Production
CORE 11.2.0.3.0 Production
TNS for IBM/AIX RISC System/6000: Version 11.2.0.3.0 - Production
NLSRTL Version 11.2.0.3.0 - Production
SQL> Original Query :
SELECT
9999,
tbl_typ.FILE_ID,
tf.FILE_NM ,
tf.MIME_TYPE ,
dbms_lob.getlength(tfd.FILE_DATA)
FROM
TG_FILE tf,
TG_FILE_DATA tfd,
SELECT
FROM
TABLE
SELECT
CAST(TABLE_ESC_ATTACH(OBJ_ESC_ATTACH( 9999, 99991, 'file1.png', NULL, NULL, NULL),
OBJ_ESC_ATTACH( 9999, 99992, 'file2.png', NULL, NULL, NULL)) AS TABLE_ESC_ATTACH)
FROM
dual
) tbl_typ
WHERE
tf.FILE_ID = tfd.FILE_ID
AND tf.FILE_ID = tbl_typ.FILE_ID
AND tfd.FILE_ID = tbl_typ.FILE_ID;
Elapsed: 00:00:02.90
Execution Plan
Plan hash value: 3970072279
| Id | Operation | Name | Rows | Bytes | Cost (%CPU)| Time |
| 0 | SELECT STATEMENT | | 1 | 194 | 4567 (2)| 00:00:55 |
|* 1 | HASH JOIN | | 1 | 194 | 4567 (2)| 00:00:55 |
|* 2 | HASH JOIN | | 8168 | 287K| 695 (3)| 00:00:09 |
| 3 | VIEW | | 8168 | 103K| 29 (0)| 00:00:01 |
| 4 | COLLECTION ITERATOR CONSTRUCTOR FETCH| | 8168 | 16336 | 29 (0)| 00:00:01 |
| 5 | FAST DUAL | | 1 | | 2 (0)| 00:00:01 |
| 6 | TABLE ACCESS FULL | TG_FILE | 565K| 12M| 659 (2)| 00:00:08 |
| 7 | TABLE ACCESS FULL | TG_FILE_DATA | 852K| 128M| 3863 (1)| 00:00:47 |
Predicate Information (identified by operation id):
1 - access("TF"."FILE_ID"="TFD"."FILE_ID" AND "TFD"."FILE_ID"="TBL_TYP"."FILE_ID")
2 - access("TF"."FILE_ID"="TBL_TYP"."FILE_ID")
Statistics
7 recursive calls
0 db block gets
16783 consistent gets
16779 physical reads
0 redo size
916 bytes sent via SQL*Net to client
524 bytes received via SQL*Net from client
2 SQL*Net roundtrips to/from client
0 sorts (memory)
0 sorts (disk)
2 rows processed Indexes are present in both the tables ( TG_FILE, TG_FILE_DATA ) on column FILE_ID.
select
index_name,blevel,leaf_blocks,DISTINCT_KEYS,clustering_factor,num_rows,sample_size
from
all_indexes
where table_name in ('TG_FILE','TG_FILE_DATA');
INDEX_NAME BLEVEL LEAF_BLOCKS DISTINCT_KEYS CLUSTERING_FACTOR NUM_ROWS SAMPLE_SIZE
TG_FILE_PK 2 2160 552842 21401 552842 285428
TG_FILE_DATA_PK 2 3544 852297 61437 852297 852297 Ideally the view should have used NESTED LOOP, to use the indexes since the no. of rows coming from object collection is only 2.
But it is taking default as 8168, leading to HASH join between the tables..leading to FULL TABLE access.
So my question is, is there any way by which I can change the statistics while using collections in SQL ?
I can use hints to use indexes but planning to avoid it as of now. Currently the time shown in explain plan is not accurate
Modified query with hints :
SELECT
/*+ index(tf TG_FILE_PK ) index(tfd TG_FILE_DATA_PK) */
9999,
tbl_typ.FILE_ID,
tf.FILE_NM ,
tf.MIME_TYPE ,
dbms_lob.getlength(tfd.FILE_DATA)
FROM
TG_FILE tf,
TG_FILE_DATA tfd,
SELECT
FROM
TABLE
SELECT
CAST(TABLE_ESC_ATTACH(OBJ_ESC_ATTACH( 9999, 99991, 'file1.png', NULL, NULL, NULL),
OBJ_ESC_ATTACH( 9999, 99992, 'file2.png', NULL, NULL, NULL)) AS TABLE_ESC_ATTACH)
FROM
dual
tbl_typ
WHERE
tf.FILE_ID = tfd.FILE_ID
AND tf.FILE_ID = tbl_typ.FILE_ID
AND tfd.FILE_ID = tbl_typ.FILE_ID;
Elapsed: 00:00:00.01
Execution Plan
Plan hash value: 1670128954
| Id | Operation | Name | Rows | Bytes | Cost (%CPU)| Time |
| 0 | SELECT STATEMENT | | 1 | 194 | 29978 (1)| 00:06:00 |
| 1 | NESTED LOOPS | | | | | |
| 2 | NESTED LOOPS | | 1 | 194 | 29978 (1)| 00:06:00 |
| 3 | NESTED LOOPS | | 8168 | 1363K| 16379 (1)| 00:03:17 |
| 4 | VIEW | | 8168 | 103K| 29 (0)| 00:00:01 |
| 5 | COLLECTION ITERATOR CONSTRUCTOR FETCH| | 8168 | 16336 | 29 (0)| 00:00:01 |
| 6 | FAST DUAL | | 1 | | 2 (0)| 00:00:01 |
| 7 | TABLE ACCESS BY INDEX ROWID | TG_FILE_DATA | 1 | 158 | 2 (0)| 00:00:01 |
|* 8 | INDEX UNIQUE SCAN | TG_FILE_DATA_PK | 1 | | 1 (0)| 00:00:01 |
|* 9 | INDEX UNIQUE SCAN | TG_FILE_PK | 1 | | 1 (0)| 00:00:01 |
| 10 | TABLE ACCESS BY INDEX ROWID | TG_FILE | 1 | 23 | 2 (0)| 00:00:01 |
Predicate Information (identified by operation id):
8 - access("TFD"."FILE_ID"="TBL_TYP"."FILE_ID")
9 - access("TF"."FILE_ID"="TBL_TYP"."FILE_ID")
filter("TF"."FILE_ID"="TFD"."FILE_ID")
Statistics
0 recursive calls
0 db block gets
16 consistent gets
8 physical reads
0 redo size
916 bytes sent via SQL*Net to client
524 bytes received via SQL*Net from client
2 SQL*Net roundtrips to/from client
0 sorts (memory)
0 sorts (disk)
2 rows processed
Thanks,
BThanks Tubby,
While searching I had found out that we can use CARDINALITY hint to set statistics for TABLE funtion.
But I preferred not to say, as it is currently undocumented hint. I now think I should have mentioned it while posting for the first time
http://www.oracle-developer.net/display.php?id=427
If we go across the document, it has mentioned in total 3 hints to set statistics :
1) CARDINALITY (Undocumented)
2) OPT_ESTIMATE ( Undocumented )
3) DYNAMIC_SAMPLING ( Documented )
4) Extensible Optimiser
Tried it out with different hints and it is working as expected.
i.e. cardinality and opt_estimate are taking the default set value
But using dynamic_sampling hint provides the most correct estimate of the rows ( which is 2 in this particular case )
With CARDINALITY hint
SELECT
/*+ cardinality( e, 5) */*
FROM
TABLE
SELECT
CAST(TABLE_ESC_ATTACH(OBJ_ESC_ATTACH( 9999, 99991, 'file1.png', NULL, NULL, NULL),
OBJ_ESC_ATTACH( 9999, 99992, 'file2.png', NULL, NULL, NULL)) AS TABLE_ESC_ATTACH)
FROM
dual
) e ;
Elapsed: 00:00:00.00
Execution Plan
Plan hash value: 1467416936
| Id | Operation | Name | Rows | Bytes | Cost (%CPU)| Time |
| 0 | SELECT STATEMENT | | 5 | 10 | 29 (0)| 00:00:01 |
| 1 | COLLECTION ITERATOR CONSTRUCTOR FETCH| | 5 | 10 | 29 (0)| 00:00:01 |
| 2 | FAST DUAL | | 1 | | 2 (0)| 00:00:01 |
With OPT_ESTIMATE hint
SELECT
/*+ opt_estimate(table, e, scale_rows=0.0006) */*
FROM
TABLE
SELECT
CAST(TABLE_ESC_ATTACH(OBJ_ESC_ATTACH( 9999, 99991, 'file1.png', NULL, NULL, NULL),
OBJ_ESC_ATTACH( 9999, 99992, 'file2.png', NULL, NULL, NULL)) AS TABLE_ESC_ATTACH)
FROM
dual
) e ;
Execution Plan
Plan hash value: 4043204977
| Id | Operation | Name | Rows | Bytes | Cost (%CPU)| Time |
| 0 | SELECT STATEMENT | | 5 | 485 | 29 (0)| 00:00:01 |
| 1 | VIEW | | 5 | 485 | 29 (0)| 00:00:01 |
| 2 | COLLECTION ITERATOR CONSTRUCTOR FETCH| | 5 | 10 | 29 (0)| 00:00:01 |
| 3 | FAST DUAL | | 1 | | 2 (0)| 00:00:01 |
With DYNAMIC_SAMPLING hint
SELECT
/*+ dynamic_sampling( e, 5) */*
FROM
TABLE
SELECT
CAST(TABLE_ESC_ATTACH(OBJ_ESC_ATTACH( 9999, 99991, 'file1.png', NULL, NULL, NULL),
OBJ_ESC_ATTACH( 9999, 99992, 'file2.png', NULL, NULL, NULL)) AS TABLE_ESC_ATTACH)
FROM
dual
) e ;
Elapsed: 00:00:00.00
Execution Plan
Plan hash value: 1467416936
| Id | Operation | Name | Rows | Bytes | Cost (%CPU)| Time |
| 0 | SELECT STATEMENT | | 2 | 4 | 11 (0)| 00:00:01 |
| 1 | COLLECTION ITERATOR CONSTRUCTOR FETCH| | 2 | 4 | 11 (0)| 00:00:01 |
| 2 | FAST DUAL | | 1 | | 2 (0)| 00:00:01 |
Note
- dynamic sampling used for this statement (level=2)I will be testing the last option "Extensible Optimizer" and put my findings here .
I hope oracle in future releases, improve the statistics gathering for collections which can be used in DML and not just use the default block size.
By the way, are you aware why it uses the default block size ? Is it because it is the smallest granular unit which oracle provides ?
Regards,
B -
Using Proxy User Authentication in Sql Developer
Hi!
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Thanks!
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DBA
VA Department of Juvenile JusticeI found the possibility that proxy authentication of both accounts can be enforced:
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Martin -
Hi,
begin
create table sample_test ( x number);
end;
gives an error, but
begin
execute immediate 'create table sample_test(x number)';
end
very much works, is there any specific reason to why the first way of doing a DDL statement is restricted or avoided???
cheereHi,
begin
create table sample_test ( x number);
end;
you can not issue DDL like above in a PL/SQL Block, hence error
gives an error, but
begin
execute immediate 'create table sample_test(x
(x number)';
end
You Issued DDL in PL/SQL Block using Native Dynamic SQL, hence worked !!
Message was edited by:
biswabijay -
How to Use name_in in the Pl/sql library
Dear all,
I have made a Pl/sql library to disable and enable items on the form
and when i use set_item_property on some items it gives me an error " no such property for set_item_property", but i think its cause i am trying to set property for an item which is a current item
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and do i have to user :system.current_item
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best regards,
ShoooshHi
Here is a sample code check it out
procedure rp_set_attr (p_field_name in varchar2, p_flag in varchar2) is
-- p_flag : H - Hidden,
-- V - Visible,
-- D - Disabled,
-- EM - Enabled Mandatory,
-- EN - Enabled Non-Mandatory
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v_it_id item := find_item(p_field_name);
begin
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set_block_property (p_field_name, update_allowed, property_false);
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end if;
if get_item_property (p_field_name, item_type) = 'BUTTON' then
if p_flag = 'D' then
set_item_property (p_field_name, enabled, property_false);
else
set_item_property (p_field_name, enabled, property_true);
end if;
elsif get_item_property (p_field_name, item_type) <> 'DISPLAY ITEM' then
if p_flag = 'D' then
set_item_property (v_it_id, enabled, property_false);
set_item_property (v_it_id, visual_attribute, 'DISPLAY_ITEM');
else
set_item_property (v_it_id, enabled, property_true);
set_item_property (v_it_id, navigable, property_true);
set_item_property (v_it_id, updateable, property_true);
if get_item_property (p_field_name, item_type) <> 'RADIO GROUP' then
set_item_property (v_it_id, queryable, property_true);
end if;
if p_flag = 'EM' then
set_item_property (v_it_id, visual_attribute, 'MANDATORY_ATTR');
if get_item_property (p_field_name, item_type) = 'LIST' then
set_item_property (v_it_id, required, property_true);
end if;
elsif p_flag = 'EN' then
set_item_property (v_it_id, visual_attribute, 'NON_MANDATORY_ATTR');
if get_item_property (p_field_name, item_type) = 'LIST' then
set_item_property (v_it_id, required, property_false);
end if;
end if;
end if;
end if;
end if;
else
rp_err ('3','19', p_field_name || ' Field Name ');
end if;
end if;
end;
Regards
Nagaraj -
DESKI Report using Temp tables in MS- SQL server 2005
Hi,
I am trying to create a Free hand SQL DESKI report using temp tables in MS SQL Server-2005, I am using ODBC connection.
When I run the report, I am getting the error
u201CConnection or SQL sentence error (DA0005) No column or data to fetchu201D
Ex:
Select *
into #t1
from region
select * from #t1
drop table #t1
Please help.
Regards,
PratikPratik, the SQL does not seem right. BTW you can only retreive data via Deski Free hand SQL. Also try to use OLE DB connection.
-
Can I use Reports Server Queue PL/SQL Table API to retrieve past jobs ?
Hi all,
Can I use Reports Server Queue PL/SQL Table API to retrieve past jobs using WEB.SHOW_DOCUMENT from Forms ?
I have reviewed note 72531.1 about using this feature and wonder if i can use this metadata to retrieve past jobs submitted by a user.
The idea would be to have a form module that can filter data from the rw_server_queue table, say, base on user running the form, and be able to retrieve past jobs from Report Server Queue. For this, one would query this table and use WEB.SHOW_DOCUMENT.
Is this possible ...?
Regards, Luis ...!Based on that metalink note and the code in the script rw_server.sql, I am pretty sure that by querying the table you would be able accomplish what you want... I have not tested it myself... but it looks that it will work... you have the jobid available from the queue, so you can use web.show_document to retrieve the output previously generated...
ref:
-- Constants for p_status_code and status_code in rw_server_queue table (same as zrcct_jstype)
UNKNOWN CONSTANT NUMBER(2) := 0; -- no such job
ENQUEUED CONSTANT NUMBER(2) := 1; -- job is waiting in queue
OPENING CONSTANT NUMBER(2) := 2; -- opening report
RUNNING CONSTANT NUMBER(2) := 3; -- running report
FINISHED CONSTANT NUMBER(2) := 4; -- job has finished
TERMINATED_W_ERR CONSTANT NUMBER(2) := 5; -- job has terminated with -
Using Before report Trigger with Sql Server
i have used packages in oracle using before report triggers in bi publisher 11g is it possible to do in the same way with sql server ?? don't know much about sql server . any link or documents
Hi T.holt,
Personally, I don’t believe SQL 2008 R2 with ADMT 3.2 is supported. From the guidelines of install the Active Directory Migration Tool (ADMT), ADMT v3.2 requires a preconfigured instance of SQL Server for its underlying data store. We
should use SQL Server Express and install ADMT v3.2 on a member server. ADMT installation enforces the following service pack requirements:
• SQL Server 2005 Express must be installed with Service Pack 3 (SP3) or later.
• SQL Server 2008 Express must be installed with Service Pack 1 (SP1) or later.
If you use full versions of SQL Server 2005 or SQL Server 2008. In this case, you need to install and run the ADMT console on a remote computer, and you can run multiple ADMT consoles on different remote computers. If
you use a full version of SQL Server, ADMT installation does not enforce any service pack requirements.
For more information about installing ADMT in the target domain, you can review the following article.http://technet.microsoft.com/en-us/library/cc974370(v=ws.10).aspx
Regards,
Sofiya Li
Sofiya Li
TechNet Community Support
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