oracle cheat sheet

Table of Contents

Getting a list of indexes

Getting a cross-reference of

tables and their indexes

Determining the indexes on a

table

Getting the names of indexes

for a table

Determining the columns on

which an index is based:

Other useful metadata queries

Creating a user

Changing users password

Sharing tables between two users

Creating a public synonym for a

table

Granting DBA privileges to a user

Creating a rollback segment:

If database is hung shutting down

or starting up

Dumping and Restoring an Oracle

Database

Dump:

Restore

Oracle 9.2.0 Intermedia

Problems:

CTX_DDL must be declared

Error during stored procedure

definition

Insufficient privilege error

EXPLAIN PLAN and Autotrace

Managing statistics for the

cost-based optimizer

After bringing up database, cant

connect via SQL*Plus.

Oracle Cheat Sheet

Getting a list of indexes

The query

SELECT INDEX_NAME FROM DBA_INDEXES

will list the names of all non-system indexes. Also, from

http://technet.oracle.com/docs/products/oracle8i/doc_index.htm

System index views USER_INDEXES, ALL_INDEXES, and

DBA_INDEXES indicate

bitmap indexes by the word BITMAP appearing in the TYPE

column. A bitmap

index cannot be declared as UNIQUE.

Must have system privileges to issue the query.

Getting a cross-reference of tables and

their indexes

SELECT table_name, index_name FROM dba_indexes WHERE table_name = 'TABLENAME'

Must have system privileges to issue the query.

Determining the indexes on a table

Getting the names of indexes for a table

SELECT INDEX_NAME name FROM USER_INDEXESWHERE TABLE_NAME = 'table_name' AND GENERATED = 'N';

Determining the columns on which an index is based:

Oracle Cheat Sheet http://software.clapper.org/cheat-sheets/oracle.html#if-database-is-hung-...

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SELECT aic.index_name, aic.column_name, aic.column_position, aic.descend, aic.table_owner, CASE alc.constraint_type WHEN 'U' THEN 'UNIQUE' WHEN 'P' THEN 'PRIMARY KEY' ELSE '' END AS index_type FROM all_ind_columns aicLEFT JOIN all_constraints alc ON aic.index_name = alc.constraint_name AND aic.table_name = alc.table_name AND aic.table_owner = alc.owner WHERE aic.table_name = 'TEST2' -- table name --AND aic.table_owner = 'HR' -- table owner --AND aic.index_name = 'TEST2_FIELD5_IDX' -- index name ORDER BY column_position;

Other useful metadata queries

See http://www.alberton.info/oracle_meta_info.html

Creating a user

In SQL*Plus, connect as SYSTEM/MANAGER@dbname. Then, issue the followingSQL:

CREATE USER user IDENTIFIED BY passwordDEFAULT TABLESPACE users TEMPORARY TABLESPACE tempQUOTA UNLIMITED ON users;

For example:

CREATE USER user1 IDENTIFIED BY mypasswordDEFAULT TABLESPACE users TEMPORARY TABLESPACE tempQUOTA UNLIMITED ON users;

Next, grant appropriate privileges to the new user:

GRANT connect, resource TO user1;

In SQL*Plus, connect as user1/mypassword@dbname. Create tables, indexes,etc Theyll be owned by the new user.

Changing users password

ALTER USER user IDENTIFIED BY password

Sharing tables between two users


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Create a second user, user2. (See above) Then, connect as user1, and

issue this command:

GRANT insert, update, delete, select on user1.table1 TO user2;

Do this for all appropriate tables/indexes.

Now, if user2 logs in, he can access user1.table1, but he mustrefer to it as user1.table1. You can create a public synonym forthe table to make this easier. See below.

Creating a public synonym for a table

Log in as the tables owner (user1, in this example), and issue this SQL:

CREATE PUBLIC SYNONYM table1 FOR user1.table1

Granting DBA privileges to a user

In a word: Dont. Instead, grant the appropriate privileges on the

appropriate tables to an unprivileged user.

Creating a rollback segment:

Connect as SYSTEM/MANAGER, then:

CREATE ROLLBACK SEGMENT segname TABLESPACE USERS;

Then, add the rollback segment name to the initXXX.ora file for theinstance.

If database is hung shutting down or starting up

As Oracle user:

$ svrmgrlOracle8i Enterprise Edition Release 8.1.5.0.2 - ProductionWith the Partitioning and Java optionsPL/SQL Release 8.1.5.0.0 - Production

SVRMGR> connect internalSVRMGR> shutdownSVRMGR> startup forceSVRMGR> ^D

If that fails, try killing the Oracle processes. Then, since Oracle uses

two of the three evil sisters, semaphores and shared memory, ipcrm the

Oracle-owned one after the kill -9 and it should restart.

Dumping and Restoring an Oracle Database

Dump:


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sqlplus system/manager

Error during stored procedure definition

If the above error occurs during definition of a stored procedure, then:

sqlplus system/manager@instance

Generated by Jekyll.

trace says to run the statement(s) and print the plan(s), but avoid

displaying any results.

on prints the plan(s) and the results.

Managing statistics for the cost-based optimizer

Creating statistics for the cost-based optimizer

sqlplus system/manager@instance

oracle cheat sheet

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