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Written by Oleksandr Gavenko (AKA gavenkoa), compiled at 2015-10-05
from rev 764bb173578d
.
Oracle database.¶
Contents
Oracle database development environment.¶
- http://en.wikipedia.org/wiki/Oracle_SQL_Developer
- Integrated development environment (IDE) for working with SQL/PLSql in Oracle databases.
- http://en.wikipedia.org/wiki/SQL*Plus
- An Oracle database client that can run SQL and PL/SQL commands and display their results.
- http://en.wikipedia.org/wiki/Oracle_Forms
- Is a software product for creating screens that interact with an Oracle database. It has an IDE including an object navigator, property sheet and code editor that uses PL/SQL.
- http://en.wikipedia.org/wiki/Oracle_JDeveloper
- JDeveloper is a freeware IDE supplied by Oracle Corporation. It offers features for development in Java, XML, SQL and PL/SQL, HTML, JavaScript, BPEL and PHP.
- http://en.wikipedia.org/wiki/Oracle_Reports
- Oracle Reports is a tool for developing reports against data stored in an Oracle database.
Useful PL/SQL stub.¶
set serveroutput on;
set autotrace on statistics;
set timing on;
declare
begin
null;
end;
/
Database info.¶
List of users:
select distinct(OWNER) from ALL_TABLES;
List of current user owned tables:
select * from USER_TABLES;
select TABLE_NAME from USER_TABLES;
List of tables by owner:
select OWNER || '.' || TABLE_NAME from ALL_TABLES
order by OWNER;
List of current user table sizes:
select SEGMENT_NAME, SEGMENT_TYPE, sum(BYTES) from USER_EXTENTS
group by SEGMENT_NAME, SEGMENT_TYPE order by sum(BYTES);
select sum(BYTES) from USER_EXTENTS;
Tables indexes:
select * from USER_INDEXES order by TABLE_NAME;
List of index sizes:
select index_name, table_name, sum(user_extents.bytes) as bytes from user_indexes
left outer join user_extents on user_extents.segment_name = table_name
group by index_name, table_name
order by table_name;
List of tables without primary keys:
select OWNER || '.' || TABLE_NAME from ALL_TABLES
where TABLE_NAME not in (
select distinct TABLE_NAME from ALL_CONSTRAINTS where CONSTRAINT_TYPE = 'P'
) and OWNER in ('USER1', 'USER2')
order by OWNER, TABLE_NAME;
List of currenct user constraints:
select * from USER_CONSTRAINTS;
List of tablespaces:
select distinct TABLESPACE_NAME from USER_TABLES;
List of current user permissions:
select * from SESSION_PRIVS;
List of user permissions to tables:
select * from ALL_TAB_PRIVS where TABLE_SCHEMA not like '%SYS' and TABLE_SCHEMA not like 'SYS%';
List of user privileges:
select * from USER_SYS_PRIVS
select * from USER_TAB_PRIVS
select * from USER_ROLE_PRIVS
Profiling.¶
Timing info about last queries:
select LAST_LOAD_TIME, ELAPSED_TIME, MODULE, SQL_TEXT elasped from v$sql
order by LAST_LOAD_TIME desc
Improved version of above code:
column LAST_LOAD_TIME format a20;
column TIME format a20;
column MODULE format a10;
column SQL_TEXT format a60;
set autotrace off;
set timing off;
select * from (
select LAST_LOAD_TIME, to_char(ELAPSED_TIME/1000, '999,999,999.000') || ' ms' as TIME, MODULE, SQL_TEXT from SYS."V_\$SQL"
where SQL_TEXT like '%BATCH_BRANCHES%'
order by LAST_LOAD_TIME desc
) where ROWNUM <= 5;
In SQL/Plus:
SET TIMING ON;
-- do stuff
SET TIMING OFF;
or:
set serveroutput on
variable n number
exec :n := dbms_utility.get_time;
select ......
exec dbms_output.put_line( (dbms_utility.get_time-:n)/100) || ' seconds....' );
See:
- http://docs.oracle.com/cd/B19306_01/server.102/b14237/dynviews_2113.htm
- $SQL lists statistics on shared SQL area without the GROUP BY clause.
Last table modification time.¶
select max(scn_to_timestamp(ora_rowscn)) from TBL;
select timestamp from all_tab_modifications where table_owner = 'OWNER';
select timestamp from all_tab_modifications where table_name = 'TABLE';
Adjust date format.¶
column parameter format a32;
column value format a32;
select parameter, value from v$nls_parameters;
alter session set NLS_DATE_FORMAT = 'yyyy-mm-dd HH:MI:SS';
alter session set NLS_TIMESTAMP_FORMAT = 'MI:SS.FF6';
alter session set NLS_TIME_FORMAT = 'HH24:MI:SS.FF6';
select sysdate from dual;
Working with SQL/Plus.¶
Show error details:
show errors;
Dump how exactly field stored:
select dump(date '2009-08-07') from dual;