Overview The default method by which SQLite implements atomic commit and rollback is a rollback journal. Beginning with version 3.
Identified for informational purposes only. Future compatibility is not guaranteed. EC Identified for informational purposes only. This wait can only occur during the initial accessing of the hash table after the SQL Server instance starts.
SQL Server Examples of such areas are bitmaps, large binary objects LOBsand the spool iterator. LOBs may frequently use this wait state. Documented for informational purposes only. The scheduler is idle. The wait lets the worker tasks currently working on that population to complete or exit the current step.
Indicates that the log scans are running faster than the network sends. This is an issue only if network sends are slower than expected.
This wait is for internal data structures and is usually is very short with no direct effect on data access. Under normal conditions, this is not a customer issue because waits are expected here. This wait type guarantees that row versions are available before execution of a query under snapshot isolation.
A number of different message types use this wait type. This is an expected wait when partners change state or connection status. This is an expected wait if the log scan is caught up to the end of log or is reading from disk. The engine keeps a list of WSFC networks that is used in dynamic management views such as sys.
Tasks will usually be blocked when an update in that list is in progress. This is an expected wait, which can lengthen if the connection to the primary is slow to establish. This is an expected wait after failovers. Undo progress can be tracked through the Windows System Monitor perfmon.
This wait is also reflected by the Transaction Delay performance counter. This wait type is expected for synchronized availability groups and indicates the time to send, write, and acknowledge log to the secondary databases.
This is an expected wait when a secondary database is catching up. The processing of this request is always asynchronous, and there is a mechanism to remove redundant requests.
There are also moments that this process is suspended because of configuration changes. All waits related with this listener synchronization mechanism use this wait type.
For example, for a task that runs every 10 seconds, after one execution, Always On Availability Groups waits about 10 seconds to reschedule the task, and the wait is included here.
Used for the spinlock that grants access to it. This is on an availability replica-to-replica basis not on a database-to-database basis.
This is an expected wait when there are ready workers waiting for new work, which is the normal state. Long waits are expected and do not indicate a problem. This does not include buffer latches or transaction mark latches.
This is a measure of the time spent by background tasks that are waiting. Do not consider this state when you are looking for user stalls.
A NULL lock on the key is an instant release lock.
Consistently high values may indicate that the log devices cannot keep up with the amount of log being generated by the server. Consider increasing the size of the log file s for the affected database to reduce this wait. SQL Server R2 only. The wait ends when the distributed query call finishes.This shopping feature will continue to load items.
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This value is the default. After supplying their authentication credentials, WorkPlace checks for a current licensing agreement. If there is a problem with licensing, a message appears, indicating this is a licensing failure and not some other kind of authentication .
12 Data Guard Scenarios. This chapter describes scenarios you might encounter while administering your Data Guard configuration.
Each scenario can be adapted to your specific environment. From the Forum: “Future test takers should be very deliberate in reading answers that appear to be quotes from the MPEP. I found at least 3 instances where the answer was a long word for word quote of a case holding, but differing by one or two words toward the end of the quote.
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