Exploring Auditing

Track record changes on auditing-enabled tables. By default, the system tracks changes to the incident, change, and problem tables, among others.

Enabling auditing tracks the creation, update, and deletion of all records in the table. If you want to audit individual fields in a table, you can hide fields you don’t want to track using a dictionary attribute.

Auditing information is kept in these tables:

• The Audit table.
• The Knowing about History sets table.

警告:

Auditing system tables that receive a large amount of traffic, such as workflow Contexts [wf_context] or Event Management Alerts [em_alert], can impact performance. For this reason, you can’t audit the em_alert table as a whole. Instead, audit selected fields of interest. Set audit=true on both the em_alert table and the selected fields. Try to audit as few fields as possible.

Auditing parent and child tables

Tables don’t derive the audit flags from parent or child audited tables.

• For example, if you enable auditing for the Configuration Items [cmdb_ci] table, only CIs stored in that base table are audited.
• Likewise, if you enable auditing for the Computers [cmdb_ci_computer] table, only the computer CI records are audited, including any fields on the Computers [cmdb_ci_computer] table that is derived from the Configuration Items [cmdb_ci] table.

Auditing system tables

By default, the system doesn’t audit the deletion of a record from system tables. To audit a system table, add it to the list of tables in the glide.ui.audit_deleted_tables property list.

Auditing deletions from a form or list

By default, the system audits deletions of individual records from a form. To prevent auditing, set the table's dictionary attribute no_audit_delete.

The system audits deletions from a list when it audit is selected on the table dictionary, and the table isn’t listed in the glide.db.audit.ignore.delete property.

注:

By default, the glide.db.audit.ignore.delete property isn’t present in the System Property [sys_properties] table. To change the property, and its associated values, you must first manually add it. However, when manually added, it overwrites the following default values:

glide.db.audit.ignore.delete = sys_mutex,sys_db_cache,sys_lucene_block,sys_lucene_file,sys_lucene_directory,sys_user_preference,sys_audit,sc_cart,sc_cart_item,sys_trigger,wf_context,wf_activity,wf_condition,wf_executing,wf_history,wf_log,wf_transition,wf_transition_history, cmdb_ci_windows_service, cmdb_sam_sw_install, cmdb_software_instance, cmdb_sam_sw_usage, sam_sw_counter_detail

To learn more about adding system properties, see Add a system property

It is to be noted that by default, the audit deletes are enabled whether the record is deleted from the form view, list view, or through a script/scheduled job.

Information audited

Auditing tracks the following record changes:

• Unique Record Identifier (sys_id) of the record that changed
• Field that changed
• New field value
• Old field value
• Number of times this record and field have been updated
• Date and time when the change occurred
• User who made the change
• Reason for the change (if any reason is associated with the change)
• Internal checkpoint ID for the record, if the record has multiple versions.

Information exempted from auditing

Some updates aren’t audited despite enabling auditing on a table. For example, you may see 132 updates in a record's history, but only seven audited ones.

Auditing excludes the following information:

• Updates made by an upgrade.
• Updates are made through import sets.
• Records in parent or child tables.
• Fields with the no_audit dictionary attribute.
• System tables are not listed in the glide.ui.audit_deleted_tables property list.
• Fields that begin with the sys_ prefix (system fields), except the sys_class_name and sys_domain_id columns.
• UI Pages can sometimes trigger updates to a record without creating an audit log.
• Anytime an inactivity monitor touches a record. It prevents you seeing possibly hundreds of updates listed against an incident, with the noise drowning out the useful data.
• Manual changes to Performance Analytics scores.
• Applying Update Set
• Import XML

Auditing a table

For instructions on how to audit a table, see Configuring auditing for a table.

By default, the system tracks all fields in an audited table. You can audit a subset of fields in a table in one of two ways:

• You can enable auditing for the entire table, then exclude those fields you don’t want to include. It’s appropriate when you want to audit most, but not all, fields, and is referred to as an exclusion listing. For more information, see Exclude a field from being audited (exclusion listing).
• You can enable auditing for the table, but only for specified fields. It’s appropriate when you want to audit only a small number of the table's fields and is referred to as an inclusion listing. For information on how to include a field using an inclusion listing, see Include a table field in auditing (inclusion listing).

Non-cancellable audit records

Reduce the chances of audit records not being recorded when a transaction is canceled with the new default setting.

Audits have been set to create a record immediately in the same transaction with the target record write operations. If the target record gets deleted, the audit still gets created and retained under NCA Test Audit Delete module.

注:

The enhanced audit process is enabled by default. If the glide.db.audit.lazy property is set to True, the enhanced audit process is disabled.

Prior to Australia release, if a transaction is cancelled, certain auditable operations were missed being recorded. This is because the platform executes some operations between the record change and is cancelled before audit creation. But, now audits are created immediately after the record is changed, reducing the chances of a cancelled transaction aborting the operation before the audit is recorded.

Audits are now recorded in the same thread as the transaction. Earlier audits were created in a background thread. This change redefines the default value of the glide.db.audit.lazy property from True to False. This property is not usually defined in the Properties table because the majority of instances start using the new default value and behavior. On some instances, this property might be already present and set as True, which means that these instances won’t be able to use this change to audit behavior.

注:

It is recommended to delete this property to leverage the update.