I'm trying to understand the Oracle plan_table and ran few SQL statements to populate the plan_table...From the statements generated in the plan_table, How can I identify the order in which the statements are executed.
Selecting directly from the PLAN_TABLE is somewhat "deprecated". At least it's absolutely unnecessary nowadays. You can use dbms_xplan to view the execution plan of an explained statement:
explain plan for
select *
from your_table;;
select *
from table(dbms_xplan.display);
More details in the manual: http://docs.oracle.com/cd/E11882_01/appdev.112/e40758/d_xplan.htm#CACICEDJ
The manual also contains an example (hierarchical) SELECT statement to retrieve the contents from the PLAN_TABLE directly:
SELECT id, LPAD(' ',2*(LEVEL-1))||operation operation, options,
object_name, object_alias, qblock_name, position
FROM plan_table
START WITH id = 0 AND statement_id = 'xxxxx'
CONNECT BY PRIOR id = parent_id AND statement_id = 'xxxxx'
ORDER BY id;
The above is taken from: http://docs.oracle.com/cd/E11882_01/server.112/e26088/statements_9010.htm#sthref5965
You need to replace 'xxxx' with the statement_id you are using (which requires a set statement_id in the explain plan statement)
Related
I want to fetch sql query with machine name where sql query has been run and machine name can belong's to any user. Please guide how is it possible to get that by joing tables like DBA_hist_sql or any other table.
I can suggest such variant
select
s.sql_id,
s.sql_text,
d.machine
from
v$sql s,
dba_hist_active_sess_history d
where
d.sql_id = s.sql_id
Maybe there is better variant or more related to your question. I hope it wil be helpful for you.
I let you links on documentation of these views.
DBA_HIST_ACTIVE_SESS_HISTORY
V$SQL
You can join DBA_HIST_ACTIVE_SESS_HISTORY and DBA_HIST_SQLTEXT , as long as the sql has been captured in the workload repository.
In the DBA_HIST_ACTIVE_SESS_HISTORY you have the field MACHINE, where you got the value of SYS_CONTEXT('userenv','host') .
You can join both views by sql_id.
However, the query will not be registered on the workload repository if it's not meaningful. You can modify this behaviour by changing settings of AWR using DBMS_WORKLOAD_REPOSITORY.MODIFY_SNAPSHOT_SETTINGS
An example
select
distinct s.sql_id,
s.sql_text,
d.machine ,
u.username ,
d.program
from
gv$sql s inner join dba_hist_active_sess_history d
on ( d.sql_id = s.sql_id and S.INST_ID = D.INSTANCE_NUMBER )
inner join dba_users u on ( D.USER_ID = U.USER_ID )
where
u.username = '&1'
S.SQL_ID = '&2'
order by D.SAMPLE_TIME desc
You can apply the filter by username or sql_id, or both. keep in mind that the field USERNAME will show you the Oracle user who executed the query, not the operating system user behind that connection.
I have an oracle query that uses a created table as part of the code. Every time I need to run a report I delete current data and import the new data I receive. This is one column of id's. I need to create a report on SSRS in which the user can input this data into said table as a parameter. I have designed a simple report that they can enter some of the id's into a parameter, but there may be times when they need to enter in a few thousand id's, and the report already runs long. Here is what the SSRS code currently says:
select distinct n.id, n.notes
from notes n
join (
select max(seq_num) as seqnum, id from notes group by id) maxresults
on n.id = maxresults.ID
where n.seq_num = maxresults.seqnum
and n.id in (#MyParam)
Is there a way to have MyParam insert data into a table I would join called My_ID, joining as Join My_Id id on n.id = id.id
I do not have permissions to create functions or procedures in the database.
Thank you
You may try the trick with MATERIALIZE hint which normally forces Oracle to create a temporary table :
WITH cte1 AS
( SELECT /*+ MATERIALIZE */ 1 as id FROM DUAL
UNION ALL
SELECT 2 DUAL
)
SELECT a.*
FROM table1 a
INNER JOIN cte1 b ON b.id = a.id
I have used this query to fetch the list of sequences belonging to an Oracle database user:
SELECT * FROM all_sequences x,all_tables B
WHERE x.sequence_owner=B.owner AND B.TABLE_NAME='my_table';
But that database user is having many more sequence also, so the query returns me all the sequence of the database user. Can anybody help me to find the particular sequence of my_table using query so that I can get the auto increment id in my application.
i want the query which fetch list of table of my database user with the sequence and triggers used in the table
You can get the triggers associated with your tables from the user_triggers view. You can then look for any dependencies recorded for those triggers in user_dependencies, which may include objects other than sequences (packages etc.), so joining those dependencies to the user_sequences view will only show you the ones you are interested in.
Something like this, assuming you are looking at your own schema, and you're only interesting in triggers that references sequences (which aren't necessarily doing 'auto increment', but are likely to be):
select tabs.table_name,
trigs.trigger_name,
seqs.sequence_name
from user_tables tabs
join user_triggers trigs
on trigs.table_name = tabs.table_name
join user_dependencies deps
on deps.name = trigs.trigger_name
join user_sequences seqs
on seqs.sequence_name = deps.referenced_name;
SQL Fiddle demo.
If you're actually looking at a different schema then you'll need to use all_tables etc. and filter and join on the owner column for the user you're looking for. And if you want to include tables which don't have triggers, or triggers which don't refer to sequences, you can use outer joins.
Version looking for a different schema, though this assumes you have the privs necessary to access the data dictionary information - that the tables etc. are visible to you, which they may not be:
select tabs.table_name,
trigs.trigger_name,
seqs.sequence_name
from all_tables tabs
join all_triggers trigs
on trigs.table_owner = tabs.owner
and trigs.table_name = tabs.table_name
join all_dependencies deps
on deps.owner = trigs.owner
and deps.name = trigs.trigger_name
join all_sequences seqs
on seqs.sequence_owner = deps.referenced_owner
and seqs.sequence_name = deps.referenced_name
where tabs.owner = '<owner>';
If that can't see them then you might need to look at the DBA views, again if you have sufficient privs:
select tabs.table_name,
trigs.trigger_name,
seqs.sequence_name
from dba_tables tabs
join dba_triggers trigs
on trigs.table_owner = tabs.owner
and trigs.table_name = tabs.table_name
join dba_dependencies deps
on deps.owner = trigs.owner
and deps.name = trigs.trigger_name
join dba_sequences seqs
on seqs.sequence_owner = deps.referenced_owner
and seqs.sequence_name = deps.referenced_name
where tabs.owner = '<owner>';
One way would be to run these queries to check if there are any sequence's Pseudocolumns (NEXTVAL and CURRVAL ) used in your functions , procedures, packages, Triggers or PL/SQL JAVA SOURCE.
select * from user_source where
UPPER(TEXT) LIKE '%NEXTVAL%';
select * from all_source where
UPPER(TEXT) LIKE '%NEXTVAL%';
Then go to the specific Procedure, Function or Trigger to check which column/table gets populated by a sequence.
The query could also be used with '%CURRVAL%'
This might not help if you are running inserts from JDBC or other external applications using a sequence.
Oracle 12c introduced the IDENTITY columns, using which you could create a table with an identity column, which is generated by default.
CREATE TABLE t1 (c1 NUMBER GENERATED BY DEFAULT ON NULL AS IDENTITY,
c2 VARCHAR2(10));
This will internally create a sequence that auto-generates the value for the table's column.So, If you would like to know which sequence generates the value for which table, you may query the all_tab_columns
SELECT data_default AS sequence_val
,table_name
,column_name
FROM all_tab_columns
WHERE OWNER = 'HR'
AND identity_column = 'YES';
SEQUENCE_VAL |TABLE_NAME |COLUMN_NAME
-----------------------------------------|-------------------------------------
"HR"."ISEQ$$_78160".nextval |T1 |C1
I found a solution to this problem to guess the sequence of a particular sequence
select * from SYS.ALL_SEQUENCES where SEQUENCE_OWNER='OWNER_NAME' and LAST_NUMBER between (select max(FIELD_NAME) from TABLE_NAME) and (select max(FIELD_NAME)+40 from TABLE_NAME);
This query will guess by search the LAST_NUMBER of the sequence value between MAX value of the field using sequence and Max value + 40 (in my case cache value is 20, so I put 40)
select SEQUENCE_NAME from sys.ALL_TAB_IDENTITY_COLS where owner = 'SCHEMA_NAME' and table_name = 'TABLE_NAME';
I have a problem while creating views with a procedure, because the Oracle ignores the order of columns I specified.
I create the text of the command for creating view in a loop (in every loop one view), at the end of view I execute EXECUTE IMMEDIATE textOfCommand;
I tried to add /*+ORDERED */ before select but this did not help. (I also tried to run the queries directly, not from procedure)
The generated command itself is good, also column_id is good, but it is ignored in oracle developer or in geomedia. I think this will be something with optimization of the query, because there are several joins in the query.
I just cannot understand why it is so unpredictable, The order is sometimes good, sometimes not (if I run the same command several times) it doesn't depend on view, it is absolutely random, and I cannot figure out what is the reason.
If you have any idea, please share it. Thanks
EDIT :
I have a problem with the order of columns (not rows) that are shown in oracle developer and also geomedia. When I click the tab 'Columns' in Oracle developer, a can see all the columns of view with good COLUMN_ID, but they are not ordered by this column. I thought it was just the way, that the oracle developer displays it, but also other software has a problem with it. If I run the select command, the order is good. I wouldn't mind the order in oracle developer, but the problem is the customer's software (geomedia).
here is an examle of generated sql that is created by procedure and then run by EXECUTE IMMEDIATE command at the end of each loop in procedure. :
(there is something about 100 such a views. Tables, columns and orders is taken from one configuration table, that specifies all this. And I use GDOSYS.GPICKLISTS to identify FK and tables that should be joined)
CREATE OR REPLACE FORCE VIEW "SOME_VIEW" AS
SELECT /*+ORDERED */ a.ID AS "ID",
a8.TEXT_EN AS "COLUMN_NAME_1",
a.COLUMN_NAME_2 AS "COLUMN_NAME_2",
a.COLUMN_NAME_3 AS "COLUMN_NAME_3",
to_char(a.COLUMN_NAME_4,'yyyymmdd') AS "COLUMN_NAME_4",
to_char(a.COLUMN_NAME_5,'yyyymmdd') AS "COLUMN_NAME_5",
to_char(a.COLUMN_NAME_6,'yyyymmdd') AS "COLUMN_NAME_6",
to_char(a.COLUMN_NAME_7,'yyyymmdd') AS "COLUMN_NAME_7",
a.COLUMN_NAME_8 AS "COLUMN_NAME_8",
a.COLUMN_NAME_9 AS "COLUMN_NAME_9",
a.COLUMN_NAME_10 AS "COLUMN_NAME_10",
to_char(a.COLUMN_NAME_11,'yyyymmdd') AS "COLUMN_NAME_11",
a9.TEXT_EN AS "COLUMN_NAME_12",
a10.TEXT_EN AS "COLUMN_NAME_13",
a.COLUMN_NAME_14 AS "COLUMN_NAME_14",
a11.TEXT_EN AS "COLUMN_NAME_15",
FROM SOME_TABLE a
LEFT JOIN IENC.TABLE1 a8 on a8.id = a.COLUMN_NAME_1
LEFT JOIN IENC.TABLE2 a9 on a9.id = a.COLUMN_NAME_12
LEFT JOIN IENC.TABLE3 a10 on a10.id = a.COLUMN_NAME_13
LEFT JOIN IENC.TABLE4 a11 on a11.id = a.COLUMN_NAME_15
I assume what is "unpredictable" is something like
SELECT column_name, data_type, column_id
FROM user_tab_cols
WHERE table_name = 'SOME_VIEW';
If you want to order rows by some column, you must explicitly add ORDER BY clause.
SELECT column_name, data_type, column_id
FROM user_tab_cols
WHERE table_name = 'SOME_VIEW'
ORDER BY column_id;
Try without the double quote for the columns' name.
SELECT /*+ORDERED */ a.ID AS "ID", => SELECT /*+ORDERED */ a.ID AS ID,
If I run the SQL in Fig. 1 below, it may return something like this:
Select fname, lname from name_tbl where nam_key = :key
Without using some fancy DBA trace utility, how can I query an Oracle system table to find the value of the bind variable “:key”?
Figure 1. - List the current running sql statement.
select sid, username, sql_text
from v$session,
v$sqltext
where sql_address = address
and sql_hash_value = hash_value
order by sid, piece;
select name, value_string
from v$sql_bind_capture
where sql_id = your_query_id
Upd. or, of course:
select sql_id, value_string
from v$sql_bind_capture
where name = ':key'