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Home -> Community -> Mailing Lists -> Oracle-L -> repost - Poor performance querying CLOBs
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Has anyone else run into performance problems using LOBS? I found that both the exp utility, Pro*C, and OCI programs all seem to be very slow at accessing CLOBS when using a TCP/IP connection. Sqlplus otoh accesses them just fine regardless of the connection type.
If I try to export a table containing 400 rows and two clob columns, I can do it in 2 seconds if I use an IPC connection. If I try it over TCP it takes 91 seconds. The export is running on the same server as the database so it shouldn't be a networking issue. The same sort of poor query performance is seen in OCI and PRO*C applications.
If I query the same table however using sqlplus, a "select *" completes in 2 seconds. A "select *" from a remote host completes in about 7 seconds. Why is it taking so long to query with OCI or to export the table?
Thanks in advance,
Chuck
<P>Has anyone else run into performance problems using LOBS? I found that both the exp utility, Pro*C, and OCI programs all seem to be very slow at accessing CLOBS when using a TCP/IP connection. Sqlplus otoh accesses them just fine regardless of the connection type.</P>
<P>If I try to export a table containing 400 rows and two clob columns, I can do it in 2 seconds if I use an IPC connection. If I try it over TCP it takes 91 seconds. The export is running on the same server as the database so it shouldn't be a networking issue. The same sort of poor query performance is seen in OCI and PRO*C applications.</P>
<P>If I query the same table however using sqlplus, a "select *" completes in 2 seconds. A "select *" from a remote host completes in about 7 seconds. Why is it taking so long to query with OCI or to export the table?</P>
<P>Thanks in advance,</P>
<BLOCKQUOTE style="MARGIN-RIGHT: 0px">
<P>Chuck</P></BLOCKQUOTE>
<P> </P><BR><BR><p><br><hr size=1><b>Do You Yahoo!?</b><br>
Kick off your party with Yahoo! Invites.
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Received on Tue Aug 08 2000 - 09:56:26 CDT
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