Fact ' SQL * Net client message' indicate that the network is not good?

The report below 10046 trace, I have just issued a query to extract all records from a table with about 400 K records, but it took more than 3 minutes to recover all data.
Most of the time when waiting for SQL * Net message from client.
This indicates that the network is not good?


SQL ID: d84ta7m8h6wg2
Plan of Hash: 3635621446
Select * from XXXXXXXXXXXXXXXXX


call the query of disc elapsed to cpu count current lines
Parse 1 0.00 0.00 0 0 0 0
Run 1 0.00 0.00 0 0 0 0
Fetch 855 0.88 0.10 0 7912 0 426721
Total 857 0.10-0.88 0 7912 0 426721

Chess in the library during parsing cache: 0
Optimizer mode: ALL_ROWS
The analysis of the user id: 123

Rows Row Source operation
426721 TABLE ACCESS FULL XXXXXXXXXXXXXXX (cr = 7912 pr = 0 pw = time 0 = 467817 u)
s cost = 1847 size = map 46080540 = 415140)


Elapsed time are waiting on the following events:
Event waited on times expected maximum wait the Total WHEREAS

SQL * Net message to client 856 0.00 0.00
SQL * Net client message 856 3.71 179.63
Disk file I/O 1 operations 0.00 0.00
SQL * Net more data to the client 5224 0.37 0.46

Published by: NathanielNie on January 24, 2013 16:40

Run you the same Oracle_Home SQL and Server query as the ETL engine? (Want to use the same libraries and host and network such as ETL).

The large data sets in ETL can be assembled with network optimization. Some of it is on the physical network layer (for example having a dedicated private network or a switched network between the ETL and the DB server), some of them can be found on the configuration settings (arraysize, configuring TCP settings to the OS layer, etc.) or libraries (for example JDBC libraries). Some of them may simply be patches to fix bugs!

Hemant K Collette

Tags: Database

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