/****************************************************************************
** (c) Copyright IBM Corp. 2007 All rights reserved.
**
** The following sample of source code ("Sample") is owned by International
** Business Machines Corporation or one of its subsidiaries ("IBM") and is
** copyrighted and licensed, not sold. You may use, copy, modify, and
** distribute the Sample in any form without payment to IBM, for the purpose of
** assisting you in the development of your applications.
**
** The Sample code is provided to you on an "AS IS" basis, without warranty of
** any kind. IBM HEREBY EXPRESSLY DISCLAIMS ALL WARRANTIES, EITHER EXPRESS OR
** IMPLIED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
** MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. Some jurisdictions do
** not allow for the exclusion or limitation of implied warranties, so the above
** limitations or exclusions may not apply to you. IBM shall not be liable for
** any damages you suffer as a result of using, copying, modifying or
** distributing the Sample, even if IBM has been advised of the possibility of
** such damages.
*****************************************************************************
**
** SOURCE FILE NAME: tbrunstats.c
**
** SAMPLE: How to perform runstats on a table
**
** CLI FUNCTIONS USED:
** SQLAllocHandle -- Allocate Handle
** SQLExecDirect -- Execute a Statement Directly
** SQLFetch -- Fetch Next Row
** SQLFreeHandle -- Free Handle Resources
** SQLSetConnectAttr -- Set Connection Attributes
**
** DB2 APIs USED:
** db2Runstats -- Runstats
**
** STRUCTURES USED:
** db2ColumnData
** sqlca
**
**
*****************************************************************************
**
** For more information on the sample programs, see the README file.
**
** For information on developing CLI applications, see the CLI Guide
** and Reference.
**
** For information on using SQL statements, see the SQL Reference.
**
** For the latest information on programming, building, and running DB2
** applications, visit the DB2 Information Center:
** http://publib.boulder.ibm.com/infocenter/db2luw/v9r7/index.jsp
****************************************************************************/
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <sqlcli1.h>
#include <db2ApiDf.h>
#include "utilcli.h" /* Header file for CLI sample code */
int TbRunstats(SQLHANDLE);
int SchemaNameGet(SQLHANDLE); /* support function */
char schemaName[10];
char tableName[10];
int main(int argc, char *argv[])
{
SQLRETURN cliRC = SQL_SUCCESS;
int rc = 0;
SQLHANDLE henv; /* environment handle */
SQLHANDLE hdbc; /* connection handles */
char dbAlias[SQL_MAX_DSN_LENGTH + 1];
char user[MAX_UID_LENGTH + 1];
char pswd[MAX_PWD_LENGTH + 1];
/* checks the command line arguments */
rc = CmdLineArgsCheck1(argc, argv, dbAlias, user, pswd);
if (rc != 0)
{
return rc;
}
printf("\nTHIS SAMPLE SHOWS ");
printf("HOW TO PERFROM RUNSTATS ON A TABLE.\n");
/* initialize the CLI application by calling a helper
utility function defined in utilcli.c */
rc = CLIAppInit(dbAlias,
user,
pswd,
&henv,
&hdbc,
(SQLPOINTER)SQL_AUTOCOMMIT_ON);
if (rc != 0)
{
return rc;
}
/* performs Runstats on the table */
rc = TbRunstats(hdbc);
/* terminate the CLI application by calling a helper
utility function defined in utilcli.c */
rc = CLIAppTerm(&henv, &hdbc, dbAlias);
return rc;
} /* main */
/* gets the schema name of the table */
int SchemaNameGet(SQLHANDLE hdbc)
{
SQLRETURN cliRC = SQL_SUCCESS;
int rc = 0;
SQLHANDLE hstmt; /* statement handle */
SQLCHAR *stmt = (SQLCHAR *) "SELECT tabschema FROM syscat.tables "
"WHERE tabname = 'EMPLOYEE' ";
struct
{
SQLINTEGER ind;
SQLCHAR val[15];
}
tabschema; /* variable to be bound to the tabschema column */
printf("\nUSE THE CLI FUNCTIONS\n");
printf(" SQLSetConnectAttr\n");
printf(" SQLAllocHandle\n");
printf(" SQLExecDirect\n");
printf(" SQLFetch\n");
printf(" SQLGetData\n");
printf(" SQLFreeHandle\n");
printf("TO GET SCHEMA NAME OF THE TABLE\n\n");
/* set AUTOCOMMIT on */
cliRC = SQLSetConnectAttr(hdbc,
SQL_ATTR_AUTOCOMMIT,
(SQLPOINTER)SQL_AUTOCOMMIT_ON,
SQL_NTS);
DBC_HANDLE_CHECK(hdbc, cliRC);
/* allocate a statement handle */
cliRC = SQLAllocHandle(SQL_HANDLE_STMT, hdbc, &hstmt);
DBC_HANDLE_CHECK(hdbc, cliRC);
/* directly execute the statement */
cliRC = SQLExecDirect(hstmt, stmt, SQL_NTS);
STMT_HANDLE_CHECK(hstmt, hdbc, cliRC);
/* fetch each row and display */
cliRC = SQLFetch(hstmt);
STMT_HANDLE_CHECK(hstmt, hdbc, cliRC);
if (cliRC == SQL_NO_DATA_FOUND)
{
printf("\n Data not found.\n");
}
while (cliRC != SQL_NO_DATA_FOUND)
{
/* get data from column */
cliRC = SQLGetData(hstmt,
1,
SQL_C_CHAR,
tabschema.val,
10,
&tabschema.ind);
STMT_HANDLE_CHECK(hstmt, hdbc, cliRC);
}
strcpy(schemaName, (char *)tabschema.val);
/* get rid of spaces from the end of schemaName */
strtok(schemaName, " ");
/* free the statement handle */
cliRC = SQLFreeHandle(SQL_HANDLE_STMT, hstmt);
STMT_HANDLE_CHECK(hstmt, hdbc, cliRC);
return rc;
} /* SchemaNameGet */
/* performs Runstats on the table */
int TbRunstats(SQLHANDLE hdbc)
{
int rc = 0;
struct sqlca sqlca;
char fullTableName[258];
db2Uint32 versionNumber = db2Version970;
db2RunstatsData runStatData;
db2ColumnData *columnList;
printf("\n-----------------------------------------------------------");
printf("\nUSE THE DB2 APIs:\n");
printf(" db2Runstats -- Runstats\n");
printf("TO UPDATE THE STATISTICS OF A TABLE.\n");
/* get fully qualified name of the table */
strcpy(tableName, "EMPLOYEE");
/* get the schema name of the table */
rc = SchemaNameGet(hdbc);
if (rc != 0)
{
return rc;
}
strcpy(fullTableName, schemaName);
strcat(fullTableName, ".");
strcat(fullTableName, tableName);
printf(" Update statistics for the table: %s\n", fullTableName);
/* allocate memory for db2ColumnData */
columnList = (struct db2ColumnData *)malloc(sizeof(struct db2ColumnData));
columnList->piColumnName = (unsigned char *)"empno";
columnList->iColumnFlags = DB2RUNSTATS_COLUMN_LIKE_STATS;
printf("\nPerforming runstats on table EMPLOYEE for column EMPNO\n");
printf("with the following options:\n");
printf(" Distribution statistics for all partitions\n");
printf(" Frequent values for table set to 30\n");
printf(" Quantiles for table set to -1 (NUM_QUANTILES as in DB Cfg)\n");
printf(" Allow others to have read-only wmahile gathering statistics\n");
/* runstats on table */
runStatData.iSamplingOption = 0;
runStatData.piTablename = (unsigned char *) fullTableName;
runStatData.piColumnList = &columnList;
runStatData.piColumnDistributionList = NULL;
runStatData.piColumnGroupList = NULL;
runStatData.piIndexList = NULL;
runStatData.iRunstatsFlags = DB2RUNSTATS_KEY_COLUMNS |
DB2RUNSTATS_DISTRIBUTION | DB2RUNSTATS_ALLOW_READ;
runStatData.iNumColumns = 1;
runStatData.iNumColdist = 0;
runStatData.iNumColGroups = 0;
runStatData.iNumIndexes = 0;
runStatData.iParallelismOption = 0;
runStatData.iTableDefaultFreqValues = 30;
runStatData.iTableDefaultQuantiles = -1;
/* call the db2Runstats API which updates statistics about the
characteristics of a table */
db2Runstats(versionNumber, &runStatData, &sqlca);
DB2_API_CHECK("table -- runstats");
free(columnList);
printf("\nMake sure to rebind all packages that use this table.\n");
return rc;
} /* TbRunstats */