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Written by Oleksandr Gavenko (AKA gavenkoa), compiled on 2017-01-30 from rev ccaa2f364422+.

Oracle database.

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';

List of Oracle Reserved Words.

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;