For how to create and apply an initial snapshot, there are sections on how to secure a snapshot for

10G was formerly known as Snapshot, and has since been used for AWR.

AWR is collected every 60 minutes by default, with a minimum interval of 10 minutes and a default storage period of 8 days.

Oracle estimates that storing 8 days of data based on 10 parallel sessions will require 200m to 300m of disk space, and it is important to ensure that there is so much free space in the sysaux tablespace, otherwise the oldest snapshot will be deleted. The more frequently it is ingested, the longer the retention time, and the more user sessions, the larger the amount of data collected and the more space required. Can be managed in OEM.

sql>exec dbms_workload_ (interval=>30,retention =>3*24*60);

interval=>0) to disable AWR information collection).

Collected every 10 seconds for reference only.

Replication Monitor > Publisher > Server Name > Publish Content - > select your content.

Right Snapshot.

Right-click > start, and after the execution, the snapshot is successful.

Then there is a content corresponding to your release under the snapshot, select, right-click, and start the synchronization process.

Database snapshots are a new feature of MSSQL2005 and are only available in Microsoft SQL Server 2005 Enterprise Edition. Also, SQL Server Management Studio does not support database snapshots, and the only way to create a snapshot is to use transact-sql.

A database snapshot is a read-only static view of a database, called a source database. At the time of creation, each database snapshot is transactionally consistent with the source database. When a database snapshot is created, the source database typically has open transactions.

Before the snapshot is available, open transactions are rolled back to make the DB snapshot transactionally consistent.

Clients can query database snapshots, which is useful for writing reports based on the data at the time the snapshot was created. Also, if the source database is corrupted later, you can restore the source database to the state it was in when the snapshot was taken.

The snapshot of the Chuangdu Songjian database can be:

Maintain historical data for reporting. Data at a specific point in time can be accessed through snapshots. For example, you can create a database snapshot at the end of a given period of time (for example, a financial quarter) for later reporting.

You can then run the report that you want to create at the end of the period on the snapshot.

Implementing a query on a snapshot of the database frees up resources on the principal database.

Accelerate the efficiency of recovery operations, using snapshots to restore a database to the state it was in when the snapshot was taken much faster than restoring from a backup; However, you can't roll forward the data after that. Depending on the disk resource, you can take 6 to 12 rolling snapshots every 24 hours. Each time a new snapshot is created, the oldest snapshot is deleted.

If you want to recover, you can restore the database to a snapshot at the moment before the error occurred. Alternatively, you can use the information in the snapshot to manually recreate deleted tables or other lost data. For example, you can copy the data from a snapshot to a database in large volumes, and then manually merge the data back into the database.

No.

1. The **general jpg format released after PS processing, this format only contains the color information of the pixel, the location information, the creation date of the file and other information.

1、.psd is the source file of the modified ** file with the suffix.

Right-click on your diagram and click on Properties to view the legend

Look at what format this diagram is, the extension is psd, then you can open it (there is no composite layer inside).

**Format is. jpg .bmp ..That's not going to work, because the graph is already composited.

If the format is psd, then there is no merged layer, and the original ** can be found.

If it's a different format, then there's no way.

Yes, you can go to Taobao to eliminate the special effects and anti-beauty.

Let's take VMware Workstation as an example to see its snapshot and restore capabilities.

How to quickly restore a virtual machine.

1. Create a snapshot of a virtual machine.

1. Click Create VM Snapshot to retain the existing state of the VM.

Note: When the system is installed, or before the test software is installed, or before the system modification settings, a snapshot can be created to return to the same state and quickly restore the virtual machine.

2. Enter a meaningful "Name" and a "Description" of the virtual machine status;

Click Create Snapshot to create a snapshot until it is complete.

2. Restore the most recent snapshot;

Click the Restore Snapshot icon to restore the VM to the most recent state.

If the test software test is completed, you can restore the snapshot directly without uninstalling it as usual, and you can restore it to the state before installation.

Three: revert to an earlier state or initial state;

1. If you want to restore a VM to an earlier state or the initial state, click Manage VM Snapshots.

2Select an earlier snapshot or an initial snapshot and click Go;

3. Click Yes to restore to the corresponding state. until completion;

A and B create a standard user replus to access the initial snapshot shared file.

Machine A creates a new x db database, selects Replication Menu > Local Publishing, right-clicks New Publishing, and next-> selects Database x db

Select the publication type, there are four types: snapshot publishing, transactional publishing, transactional publishing with updatable subscriptions, and merging publishing. Both snapshot release and merge release fetch data on a regular basis, but the difference is that merge release can be updated independently, and data updates on the subscription side can be synchronized to the publisher. The test found that if both sides are updated at the same time, the updates on the publisher side will overwrite the updates on the subscriber side.

Transaction release is transaction-driven, as long as there is an update, it will be updated synchronously.

Here I choose Transaction Sync ->next

Select the tables that need to be replicated, and there is a limitation: only tables with a primary key can be replicated. All the way to set up a **account, next. Finally, enter a release name, and the release is successful.

Select the publication you just created, right-click Properties, and select Snapshot to set the sharing path. You can also select FTP snapshots for FTP sharing. This allows the subscriber to access this path to read the initial snapshot. At this point, the publisher is set up.

On the subscriber side of machine B, select Copy -> Local Subscription -" to create a new subscription.

Select the publisher and select x db under x db publishIf you don't have x db, you can create your own database. Set up distribution and subscription accounts.