SQL Server, Databases Object


Applies To: SQL Server 2016

The SQLServer:Databases object in SQL Server provides counters to monitor bulk copy operations, backup and restore throughput, and transaction log activities. Monitor transactions and the transaction log to determine how much user activity is occurring in the database and how full the transaction log is becoming. The amount of user activity can determine the performance of the database and affect log size, locking, and replication. Monitoring low-level log activity to gauge user activity and resource usage can help you to identify performance bottlenecks.

Multiple instances of the Databases object, each representing a single database, can be monitored at the same time.

This table describes the SQL Server Databases counters.

SQL Server Databases countersDescription
Active TransactionsNumber of active transactions for the database.
Avg Dist From EOL/LP RequestAverage distance in bytes from end of log per log pool request, for requests in the last VLF.
Backup/Restore Throughput/secRead/write throughput for backup and restore operations of a database per second. For example, you can measure how the performance of the database backup operation changes when more backup devices are used in parallel or when faster devices are used. Throughput of a database backup or restore operation allows you to determine the progress and performance of your backup and restore operations.
Bulk Copy Rows/secNumber of rows bulk copied per second.
Bulk Copy Throughput/secAmount of data bulk copied (in kilobytes) per second.
Commit table entriesThe size of the in-memory portion of the commit table for the database. For more information, see sys.dm_tran_commit_table (Transact-SQL).
Data File(s) Size (KB)Cumulative size (in kilobytes) of all the data files in the database including any automatic growth. Monitoring this counter is useful, for example, for determining the correct size of tempdb.
DBCC Logical Scan Bytes/secNumber of logical read scan bytes per second for database console commands (DBCC).
Group Commit Time/secGroup stall time (microseconds) per second.
Log Bytes Flushed/secTotal number of log bytes flushed.
Log Cache Hit RatioPercentage of log cache reads satisfied from the log cache.
Log Cache Hit Ratio BaseFor internal use only.
Log Cache Reads/secReads performed per second through the log manager cache.
Log File(s) Size (KB)Cumulative size (in kilobytes) of all the transaction log files in the database.
Log File(s) Used Size (KB)The cumulative used size of all the log files in the database.
Log Flush Wait TimeTotal wait time (in milliseconds) to flush the log. On an Always On secondary database, this value indicates the wait time for log records to be hardened to disk.
Log Flush Waits/secNumber of commits per second waiting for the log flush.
Log Flush Write Time (ms)Time in milliseconds for performing writes of log flushes that were completed in the last second.
Log Flushes/secNumber of log flushes per second.
Log GrowthsTotal number of times the transaction log for the database has been expanded.
Log Pool Cache Misses/secNumber of requests for which the log block was not available in the log pool. The log pool is an in-memory cache of the transaction log. This cache is used to optimize reading the log for recovery, transaction replication, rollback, and Always On Availability Groups.
Log Pool Disk Reads/secNumber of disk reads that the log pool issued to fetch log blocks.
Log Pool Hash Deletes/secRate of raw hash entry deletes from the Log Pool.
Log Pool Hash Inserts/secRate of raw hash entry inserts into the Log Pool.
Log Pool Invalid Hash Entry/secRate of hash lookups failing due to being invalid.
Log Pool Log Scan Pushes/secRate of Log block pushes by log scans, which may come from disk or memory.
Log Pool LogWriter Pushes/secRate of Log block pushes by log writer thread.
Log Pool Push Empty FreePool/secRate of Log block push fails due to empty free pool.
Log Pool Push Low Memory/secRate of Log block push fails due to being low on memory.
Log Pool Push No Free Buffer/secRate of Log block push fails due to free buffer unavailable.
Log Pool Req. Behind Trunc/secLog pool cache misses due to block requested being behind truncation LSN.
Log Pool Requests BaseFor internal use only.
Log Pool Requests Old VLF/secLog Pool requests that were not in the last VLF of the log.
Log Pool Requests/secThe number of log-block requests processed by the log pool.
Log Pool Total Active Log SizeCurrent total active log stored in the shared cache buffer manager in bytes.
Log Pool Total Shared Pool SizeCurrent total memory usage of the shared cache buffer manager in bytes.
Log ShrinksTotal number of log shrinks for this database.
Log TruncationsThe number of times the transaction log has been shrunk.
Percent Log UsedPercentage of space in the log that is in use.
Repl. Pending XactsNumber of transactions in the transaction log of the publication database marked for replication, but not yet delivered to the distribution database.
Repl. Trans. RateNumber of transactions per second read out of the transaction log of the publication database and delivered to the distribution database.
Shrink Data Movement Bytes/secAmount of data being moved per second by autoshrink operations, or DBCC SHRINKDATABASE or DBCC SHRINKFILE statements.
Tracked transactions/secNumber of committed transactions recorded in the commit table for the database.
Transactions/secNumber of transactions started for the database per second.

 Transactions/sec does not count XTP-only transactions (transactions started by a natively compiled stored procedure)..
Write Transactions/secNumber of transactions that wrote to the database and committed, in the last second.
XTP Controller DLC Latency BaseFor internal use only.
XTP Controller DLC Latency/FetchAverage latency in microseconds between log blocks entering the Direct Log Consumer and being retrieved by the XTP controller, per second.
XTP Controller DLC Peak LatencyThe largest recorded latency, in microseconds, of a fetch from the Direct Log Consumer by the XTP controller.
XTP Controller Log Processed/secThe amount of log bytes processed by the XTP controller thread, per second.
XTP Memory Used (KB)The amount of memory used by XTP in the database.

Monitor Resource Usage (System Monitor)
SQL Server, Database Replica

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