EZ-Base Data Model
EZ-base SQL Driver Attributes |
The SQL driver for EZ-base has many attributes that can be finetuned to improve handling in scenarios with unreliable network connections to the EZ-base server or high-volumes of data. Also, many drivers have driver-specific attributes to finetune actual behaviour or handle data not matching specifications.
The EZ-base driver attributes are assigned a default value which seldom requires change. However, changes can be applied when needed on four levels, which are reflected in the table below by separate checkmarks:
•Connection string: the connection string from the settings*.xml file and applied during log on.
•Set SQL statement: a set SQL-statement to be executed once connection has been established.
•Drivers file: the providers.xml file (obsolete starting release 17.32).
•Log on: value to be specified interactively by user during log on in a user interface.
The connection string for EZ-base can be found in the settings*.xml file used for the database. Settings*.xml files are typically located in the %USERPROFILE%\invantive folder in most deployment scenarios. The reference manuals contain instructions how to relocate the settings*.xml files. Each data container of a database in the connection string can have a connectionString element specifying the name and values of attributes. Both name and value must be properly escaped according to XML-semantics. Actual application of the value is solely done during log on. A new connection must be established to change the value of a driver attribute using a connection string.
The set SQL statement can be executed after log on. The syntax is: set NAME VALUE, or for a distributed database: set NAME@ALIAS VALUE. In some scenarios you may need to enclose the driver attribute name in square brackets to escape it from parsing, for instance when a reserved SQL keyword is part of the name. The new value takes effect straight after execution of the set-statement. The set-statement can be executed as often as needed during a session.
Driver attributes that can be interactively set to a value are typically presented in the log on window. Depending on the platform and design decisions of the user interface designer, some or all of the available driver attributes can have been made available.
The EZ-base driver can be configured using the following attributes:
Code |
Description |
Origin |
Default Value |
Set from Connection String |
Set from Set SQL-Statement |
Set from Drivers File |
Set from Log On |
|---|---|---|---|---|---|---|---|
analysis-enforce-row-uniqueness |
Use for analysis only! Enforce rows to be unique. |
Shared |
False |
✓ |
✓ |
✓ |
|
bulk-delete-page-size-rows |
Number of rows to delete per batch when bulk deleting |
Shared |
10000 |
✓ |
✓ |
✓ |
|
bulk-insert-page-size-bytes |
Approximate maximum size in bytes of batch when bulk inserting |
Shared |
10000000 |
✓ |
✓ |
✓ |
|
bulk-insert-page-size-rows |
Number of rows to insert per batch when bulk inserting |
Shared |
10000 |
✓ |
✓ |
✓ |
|
force-case-sensitive-identifiers |
Consider identifiers as case-sensitive independent of the platform capabilities. |
Shared |
False |
✓ |
✓ |
✓ |
|
forced-casing-identifiers |
Forced casing of identifiers. Choose from Unset, Lower, Upper and Mixed. |
Shared |
|
✓ |
✓ |
✓ |
|
invantive-sql-compress-sparse-arrays |
Whether to compress sparse arrays in result sets during compression. |
SQL Engine V1 |
True |
✓ |
✓ |
✓ |
|
invantive-sql-correct-invalid-date |
Whether to correct dates considered invalid since they are before 01-01-1753. When nullable, they are removed. Otherwise they are replaced by 01-01-1753. |
SQL Engine V1 |
False |
✓ |
✓ |
✓ |
|
invantive-sql-forward-filters-to-data-containers |
Whether to forward filters to data containers. |
SQL Engine V1 |
True |
✓ |
✓ |
✓ |
|
invantive-sql-share-byte-arrays |
Whether to share the memory used by identical byte arrays in result sets during compression. |
SQL Engine V1 |
True |
✓ |
✓ |
✓ |
|
invantive-sql-share-strings |
Whether to share the memory used by identical strings in result sets during compression. |
SQL Engine V1 |
True |
✓ |
✓ |
✓ |
|
invantive-sql-shuffle-fetch-results-data-containers |
Whether to shuffle results fetched from data containers. |
SQL Engine V1 |
False |
✓ |
✓ |
✓ |
|
invantive-use-cache |
Whether to cache the results of a query. |
SQL Engine V1 |
True |
✓ |
✓ |
✓ |
|
log-native-calls-to-disk-max-events |
Maximum number of events to register from last activation. |
Shared |
|
✓ |
✓ |
✓ |
|
log-native-calls-to-disk-max-seconds |
Maximum number of seconds to register from last activation. |
Shared |
|
✓ |
✓ |
✓ |
|
log-native-calls-to-disk-on-error |
Registers native calls to data container backend as disk files when an error occurred. |
Shared |
False |
✓ |
✓ |
✓ |
|
log-native-calls-to-disk-on-success |
Registers native calls to data container backend as disk files when successful. |
Shared |
False |
✓ |
✓ |
✓ |
|
log-native-calls-to-trace |
Log native calls to data container backend on the trace. |
Shared |
False |
✓ |
✓ |
✓ |
|
maximum-length-identifiers |
Non-default maximum length in characters of identifier names. |
Shared |
|
✓ |
✓ |
✓ |
|
max-url-length-accepted |
The maximum accepted URL length before raising an error. |
Shared |
8000 |
✓ |
✓ |
✓ |
|
max-url-length-desired |
The maximum desired URL length. |
Shared |
8000 |
✓ |
✓ |
✓ |
|
minimum-length-text |
Extend all text columns to this length to allow processing of XML that uses longer text values than the XSD specifies. |
XML |
|
✓ |
|
|
✓ |
partition-slot-based-rate-limit-length-ms |
Total length in ms across all slots of a partition-based rate limit. |
Shared |
60000 |
✓ |
|
✓ |
|
partition-slot-based-rate-limit-slots |
Number of slots per partition-based rate limit. Null means no slot-based rate limit |
Shared |
|
✓ |
|
✓ |
|
pre-request-delay-ms |
Pre-request delay in milliseconds per request. |
Shared |
0 |
✓ |
✓ |
✓ |
|
requested-page-size |
Preferred number of rows to exchange per round trip; only effective on limited platforms such as AFAS Online |
Shared |
|
✓ |
✓ |
✓ |
|
requests-parallel-max |
Maximum number of parallel data requests from individual partitions on the data container. |
Shared |
32 |
✓ |
✓ |
✓ |
|
result-set-memory-cache |
Action: provide 'empty' to empty. |
XML |
|
|
✓ |
|
|
slot-based-rate-limit-length-ms |
Total length in ms across all slots of a slot-based rate limit. |
Shared |
60000 |
✓ |
|
✓ |
|
slot-based-rate-limit-slots |
Number of slots of a slot-based rate limit. Null means no slot-based rate limit |
Shared |
|
✓ |
|
✓ |
|
standardize-identifiers |
Rewrite all identifiers to the preferred standards as configured by standardize-identifiers-casing and maximum-length-identifiers. |
Shared |
True |
✓ |
✓ |
✓ |
|
standardize-identifiers-casing |
Rewrite all identifiers to the recommended standard platform-specific casing when changing a data model on a case-dependent platform. |
Shared |
True |
✓ |
✓ |
✓ |
|
use-metadata-memory-cache |
Whether to use the metadata in memory calculated previously Has only practical use during development on a XML provider. |
XML |
True |
✓ |
✓ |
✓ |
|
use-result-memory-cache |
Whether to use result sets cached in memory from previous queries that can answer the current query. |
XML |
False |
✓ |
✓ |
✓ |
|
xml-directories |
{res:itgen_provider_attribute_xml_directories_description} |
|
|
✓ |
✓ |
✓ |
✓ |
xml-extension |
{res:itgen_provider_attribute_xml_extension_description} |
|
*.xml |
✓ |
✓ |
✓ |
✓ |
xml-namespaces |
Comma-separated list of namespace prefixes and their URI |
|
|
✓ |
✓ |
✓ |
|
15-06-2022 21:34 Version 22.0.232-PROD+3445
