Module inspect

Useful queries to inspect the state of a SQL Server instance.

Structs

DDLEvent

A DDL event collected from the cdc.ddl_history table.

Statics

GET_COLUMNS_FOR_TABLES_WITH_CDC_QUERY 🔒

Functions

check_system_result 🔒

Helper function to parse an expected result from a “system” query.

cleanup_change_table

Cleans up the change table associated with the specified capture_instance by deleting max_deletes entries with a start_lsn less than low_water_mark.

deserialize_table_columns_to_raw_tables 🔒

ensure_database_cdc_enabled

Ensure change data capture (CDC) is enabled for the database the provided client is currently connected to.

ensure_snapshot_isolation_enabled

Ensure the SNAPSHOT transaction isolation level is enabled for the database the provided client is currently connected to.

get_cdc_table_columns

Retrieves column metdata from the CDC table maintained by the provided capture instance. The resulting column information collection is similar to the information collected for the upstream table, with the exclusion of nullability and primary key constraints, which contain static values for CDC columns. CDC table schema is automatically generated and does not attempt to enforce the same constraints on the data as the upstream table.

get_changes_asc

Queries the specified capture instance and returns all changes from [start_lsn, end_lsn), ordered by start_lsn in an ascending fashion.

get_ddl_history

Returns DDL changes made to the source table for the given capture instance. This follows the same convention as cdc.fn_cdc_get_all_changes_<capture_instance>, in that the range is inclusive, i.e. [from_lsn, to_lsn]. The events are returned in ascending order of LSN.

get_latest_restore_history_id

Retrieves the largest restore_history_id from SQL Server for the current database. The restore_history_id column is of type IDENTITY(1,1) based on EXEC sp_help restorehistory. We expect it to start at 1 and be incremented by 1, with possible gaps in values. See:

get_max_lsn

Returns the maximum log sequence number for the entire database. This implementation relies on CDC, which is asynchronous, so may return an LSN that is less than the maximum LSN of SQL server.

get_max_lsn_retry

Returns the maximum log sequence number for the entire database, retrying if the log sequence number is not available. This implementation relies on CDC, which is asynchronous, so may return an LSN that is less than the maximum LSN of SQL server.

get_min_lsn

Returns the minimum log sequence number for the specified capture_instance.

get_min_lsn_retry

Returns the minimum log sequence number for the specified capture_instance, retrying if the log sequence number is not available.

get_min_lsns

Retrieves the minumum Lsn (start_lsn field) from cdc.change_tables for the specified capture instances.

get_tables

get_tables_for_capture_instance

Returns the table metadata for the tables that are tracked by the specified capture_instances.

get_value 🔒

increment_lsn

Increments the log sequence number.

map_null_lsn_to_retry 🔒

parse_lsn 🔒

Parse an Lsn from the first column of the provided tiberius::Row.

parse_numeric_lsn 🔒

Parse an Lsn in Decimal(25,0) format of the provided tiberius::Row.

snapshot

Return a Stream that is the entire snapshot of the specified table.

snapshot_size

Returns the total number of rows present in the specified table.

validate_source_privileges

Return a Result that is empty if all tables, columns, and capture instances have the necessary permissions to and an error if any table, column, or capture instance does not have the necessary permissions for tracking changes.