Oracle 5.0 Reference Manual page 524

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tx_isolation
Variable Name
Variable Scope
Dynamic Variable
The default transaction isolation level. Defaults to
This variable can be set directly, or indirectly using the
Section 13.3.6, "SET TRANSACTION
isolation level name that contains a space, the name should be enclosed within quotation marks, with
the space replaced by a dash. For example:
SET tx_isolation = 'READ-COMMITTED';
Any unique prefix of a valid value may be used to set the value of this variable.
The default transaction isolation level can also be set at startup using the
[423] server option.
isolation
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unique_checks
Variable Name
Variable Scope
Dynamic Variable
If set to 1 (the default), uniqueness checks for secondary indexes in
set to 0, storage engines are permitted to assume that duplicate keys are not present in input data.
If you know for certain that your data does not contain uniqueness violations, you can set this to 0 to
speed up large table imports to InnoDB.
Note that setting this variable to 0 does not require storage engines to ignore duplicate keys. An
engine is still permitted to check for them and issue duplicate-key errors if it detects them.
•
updatable_views_with_limit
Version Introduced
Command-Line Format
Option-File Format
Option Sets Variable
Variable Name
Server System Variables
tx_isolation
Global, Session
Yes
Permitted Values
Type
enumeration
Default
REPEATABLE-READ
Valid
READ-UNCOMMITTED
Values
READ-COMMITTED
REPEATABLE-READ
SERIALIZABLE
REPEATABLE-READ
Syntax". If you set
unique_checks
Session
Yes
Permitted Values
Type
boolean
Default
1
[504]
5.0.2
--updatable_views_with_limit=#
updatable_views_with_limit
Yes,
updatable_views_with_limit
504
updatable_views_with_limit
[1120].
statement. See
SET TRANSACTION
[504]
tx_isolation
--transaction-
tables are performed. If
InnoDB
[504]
directly to an