oracle db file sequential read tuning

Tags: db file sequential read for Oracle wait eventDB file Sequential read:Website Explanation:This event signifies, the user process is reading a buffer to the SGA buffer cache and is

#=49758 blocks=1 obj#=139505 tim=2087740489121WAIT #3: nam= ' db file sequential read ' ela= 18210 file#=85 block#=260618 blocks=1 obj#=139505 tim=2087740507502WAIT #3: nam= ' sql*net more data from client ' ela= driver id=675562835 #bytes =1 p3=0 obj#=139505 tim=20877405082

DB file Parallel readWebsite Explanation:This happens during recovery. It can also happen during buffer prefetching, as an optimization (rather than performing multiple single-block reads). Database blocks, need to being changed as part of recovery is read in parallel from the database.Wait Time: Wait until all of the I/Os is completed650) this.width=650; "src="

diagnosis.For a row that lasts for more than 6 seconds, most of the operations may be full table scan (in any case, this part of information is worth noting ). We use a case study to familiarize ourselves with this waiting event: DB Name DB Id Instance Inst Num Release OPS Host ---------- ----------- ---------- -------- ---------- ---- ---------- K2 1999167370 k2 1 8.1.5.0.0 NO k2This is a databa

be greater than 1) On a healthy system, physical read waits should is the biggest waits after the idle waits. However, also consider whether there is direct read waits (signifying full table scans with parallel query) or DB file sc Attered read waits on a operational (

Tags: select from AST STR index operation ext ATT statement1. Cause of production This wait event typically occurs when the database is read in chunks, indicating that there is a wait associated with a full table scan and a quick index scan . This usually means too many full-table scans, or insufficient I/O capabilities, or I/O competition. 2. Determine the method of generating the problem object A) The SQL statement that looks for a full table scan c

Tags: style blog http io color OS SP for strongTo synchronize data from Oracle in real time to MS SQL Server, you need to read and write data directly to SQL Server in Oracle, and you can install the Oracle database for SQL Servers component on the Oracle about how to instal

Java sequential Read and write Properties configuration file support Chinese not garbledJava sequential read and write properties configuration file, Java default provides the properties API inherit HashMap, not

Possible causescontrol file Sequential readReading from the control file. This happens in many cases. For example, while:1. Making a backup of the control files2, sharing information (between instances) from the control file3. Reading other blocks from the control files4. Reading the header blockWait time:the wait time is the elapsed time of the

: [emailprotected]> Select Event#,name,parameter1, parameter2,parameter3 2 from v$event_name 3 where name = ' db file scattered rea d '; event# NAME NBS P PARAMETER1 PARAMETER2 PARAMETER3-------------------------------------------------------------- -------------- db file scattered

SVN cannot submit can ' t set file '/db/txn_current ' Read-write: Access Denied Reason: At the time of the commit, the SVN server was forcibly shut down, causing the version information file to be written unsuccessfully, and reading the information after the reboot was incorrect! Solution: Re-write the correct vers

One. DB file Parallel Write wait eventQuote from the following blog:Http://oradbpedia.com/wiki/Wait_Events_-_db_file_parallel_writeDB file Parallel writeThe db file parallel write wait event belongs to the Oracle database writer (

The game will use a lot of configuration files, each project group according to their own different needs will choose different storage format, such as using JSON or SQLite to store data. Here we only discuss the situation of using SQLite. In general, you will choose to put it in a read-write directory, so that SQLite can directly use its original IO API to read the DB