utm checkpoint

Myth #15: Checkpoint only writes committed transactions to disk Error The misconception is that too many people have a long history of lack of comprehensive knowledge of the log and recovery system. Checkpoint will write back to disk all pages that have changed in memory since the last checkpoint (that is, dirty pages), or dirty pages that read into memory in t

The buffer cache memory of the CKPT checkpoint queue contains the chain and bufferLRU to concatenate available blocks (based on the Access Frequency). LRUW concatenates dirty blocks (Access Frequency) and cold-end blocks are first written to the hard disk. When CBC reads data blocks into the memory, it uses CKPT (chain): 1. It links dirty blocks. 2. It links the first dirty time (from small to large) the address of the RBA redo block address log block

It is estimated that the Checkpoint Lag calculation method of the rep process on the Oracle GoldenGate (OGG) destination end is called oraclelag. This article is original. For more information, see the source. It is estimated that the Checkpoint Lag calculation method of the rep process on the target end of Oracle GoldenGate (OGG) OGG Background: The following shows the rep process at the OGG target end. A

Tags: dirty data condition default stat target PNG FAs answer technologyThis paper mainly summarizes the mechanism of writing dirty blocks in database.When a process is going to make changes to the data block1. Get CBC Latch2. Modify the buffer pin status3. Release CBC Latch4. Generate Redo Records5. Modify Buffer data block6. Move the dirty block to the checkpoint queue, so that the modification is complete.7. Get CBC Latch8. Modify the buffer pin st

Tags: TAC Delete read requires strong res PID start informationToday interview was asked a question, how to debug multi-process program, I answered GDB attach [PID], and then asked if some of the program data read wrong, but this phenomenon is accidental, this time to how to operate, then was ignorant ..., by looking up the data to find the answer, Now write down the blog post. Checkpoint 　　Sometimes the occurrence of a bug occurs accidentally, if the

Misunderstanding #15: CheckPoint only writes committed transactions to the diskErrorThis misunderstanding is due to the lack of comprehensive understanding of logs and recovery systems for a long time. CheckPoint writes all pages that have changed in memory since the last CheckPoint back to the disk (Note: Dirty pages), or writes the dirty pages read from the mem

1. Overview As with the old version of TensorFlow, the model needs to be saved, and this preservation is cyclical. Because in many cases the gradient will swing around the local minimum, that is to say, in many cases, the last training model is not necessarily optimal. 2. Save the Model We can create a location where the checkpoint is saved when we build the model, and we can start by creating a folder with the following command. You can add paramet

operation, you can solve the problem mentioned earlier. Of course, we can also choose cache to disk to deal with large data size. CheckPoint when we perform CheckPoint operation on the RDD, we only temporarily add a tag to indicate that the RDD needs to be CheckPoint. In the subsequent action operation, after runjob calculation of the RDD, the docheckpoint activ

OGG target checkpoint table drop Repair Method OGG target checkpoint table drop Repair Method Reference: OGG Replicat Failed Due To Check_point Table beingTruncated (Document ID 1319832.1) 1. First, start repfull reports the following error: GGSCI (localhost. localdomain) 8> view report repfull **************************************** *******************************Oracle GoldenGate Delivery for OracleVersi

Select name, value from V $ sysstat where upper (name) like '% dbwr % ';SQL>/ NAME value--------------------------------------------------------------------------Flash cache insert SKIP: dbwr overloaded 0Dbwr checkpoint buffers written 61031854Dbwr thread checkpoint buffers written 53Dbwr tablespace checkpoint Buffers' written 34559Dbwr parallel query

Label:Checkpoint is mainly to solve the problem: 1. Shorten the recovery time of the database 2. When the buffer pool is not enough, flush the dirty pages to disk 3. Refresh dirty pages When redo logs are not available The InnoDB engine uses the LSN (log sequence number) to mark the log version. LSN is a 8-byte number. Each page has LSN, redo log, LSN, checkpoint, and LSN. There are two types of checkpoint