Database Administration (MOSC)

MOSC Banner

Large "SQL*Net vector data to client" wait events during PDB hot cloning

in Database Administration (MOSC) 5 commentsAnswered

Dear Oracle Community

We are performing hot clone of pluggable databases on our 19cRU9 CDBs. Source and target CDBs locations are on same and different servers (both scenarios).

Source PDBs contain lot of securefile LOBs, and probably because of that there is large amount of "SQL*Net vector data to client" wait events on source CDB during cloning (in the same time there is lot of "remote db file read" and "pluggable database file copy" wait events on target CDB).

How I understand, Oracle net services threat securefile LOBs different than "ordinary" data and tuning DEFAULT_SDU_SIZE parameter doesn't make any change. Also, tuning arraysize or fetchsize in sqlplus before clone execution doesn't help. I also increased number of redologs and their sizes in target CDB.

Howdy, Stranger!

Log In

To view full details, sign in to My Oracle Support Community.

Register

Don't have a My Oracle Support Community account? Click here to get started.

Category Leaderboard

Top contributors this month

Instructions for posting

×

1. Select a discussion category from the picklist.


2. Enter a title that clearly identifies the subject of your question.


3. In the body, insert detailed information, including Oracle product and version.


Please abide by the Oracle Community guidelines and refrain from posting any customer or personally identifiable information (PI/CI).


Cloud / Fusion customers - Our Cloud community has moved! Please go to Cloud Customer Connect .


New to My Oracle Support Community? Visit our Welcome Center

MOSC Help Center