All,
I've run into some very serious problems (for me) with changes made to the OCI driver for 1.8.1. Specifically lines the following lines (270-274). oDimCmd.Append( "SELECT a." ); oDimCmd.Append( pszGeomName ); oDimCmd.Append( ".GET_DIMS() DIM FROM " ); oDimCmd.Append( pszTableName ); oDimCmd.Append( " a WHERE ROWNUM = 1" ); Our schema has many large tables and several views which use these tables. The views are referenced in all_sdo_geom_metadata. When the query "select a.geometry.get_dims() dim from <the_view> a where rownum = 1" is run it results in FULL Table accesses. This has result in running sorted queries on very large tables and I managed to blow out the temp table space on our oracle instance just calling OGROpen. To say the least our DBA's are not happy with me. I'm considering changing : oDimCmd.Append( "SELECT a." ); oDimCmd.Append( pszGeomName ); oDimCmd.Append( ".GET_DIMS() DIM FROM " ); oDimCmd.Append( pszTableName ); oDimCmd.Append( " a WHERE ROWNUM = 1" ); to: oDimCmd.Append( "SELECT COUNT(t.SDO_DIMNAME) DIM FROM ALL_SDO_GEOM_METADATA A, TABLE(A.DIMINFO) T WHERE a.TABLE_HAME='" ); oDimCmd.Append( pszTableName ); oDimCmd.Append( "'" ); The following code was not in 1.7.2. "ogrocitablelayer.cpp" Lines 259-316 /* -------------------------------------------------------------------- */ /* Identify Geometry dimension */ /* -------------------------------------------------------------------- */ if( pszGeomName != NULL && strlen(pszGeomName) > 0 ) { OGROCIStringBuf oDimCmd; OGROCIStatement oDimStatement( poSession ); char **papszResult; int iDim = -1; oDimCmd.Append( "SELECT a." ); oDimCmd.Append( pszGeomName ); oDimCmd.Append( ".GET_DIMS() DIM FROM " ); oDimCmd.Append( pszTableName ); oDimCmd.Append( " a WHERE ROWNUM = 1" ); oDimStatement.Execute( oDimCmd.GetString() ); papszResult = oDimStatement.SimpleFetchRow(); if( CSLCount(papszResult) < 1 ) { OGROCIStringBuf oDimCmd2; OGROCIStatement oDimStatement2( poSession ); char **papszResult2; oDimCmd2.Appendf( 1024, "select m.sdo_index_dims\n" "from all_sdo_index_metadata m, all_sdo_index_info i\n" "where i.index_name = m.sdo_index_name\n" " and i.sdo_index_owner = m.sdo_index_owner\n" " and i.table_name = upper('%s')", pszTableName ); oDimStatement2.Execute( oDimCmd2.GetString() ); papszResult2 = oDimStatement2.SimpleFetchRow(); if( CSLCount( papszResult2 ) > 0 ) { iDim = atoi( papszResult2[0] ); } } else { iDim = atoi( papszResult[0] ); } if( iDim > 0 ) { SetDimension( iDim ); } else { CPLDebug( "OCI", "get dim based of existing data or index failed." ); } } This electronic communication and any attachments may contain confidential and proprietary information of DigitalGlobe, Inc. If you are not the intended recipient, or an agent or employee responsible for delivering this communication to the intended recipient, or if you have received this communication in error, please do not print, copy, retransmit, disseminate or otherwise use the information. Please indicate to the sender that you have received this communication in error, and delete the copy you received. DigitalGlobe reserves the right to monitor any electronic communication sent or received by its employees, agents or representatives.
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