/**************************************************************************** ** (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: tbcompress.sqc ** ** SAMPLE: How to create tables with null and default value compression ** option. ** ** SQL STATEMENTS USED: ** CREATE TABLE ** ALTER TABLE ** DROP TABLE ** ** ***************************************************************************** ** ** For more information on the sample programs, see the README file. ** ** For information on developing embedded SQL applications see the Developing Embedded SQL Applications book. ** ** 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 <stdlib.h> #include <string.h> #include <sqlenv.h> #include <sqlutil.h> #include "utilemb.h" int TbCreate(void); int TbCompress(void); int TbDrop(void); EXEC SQL INCLUDE SQLCA; int main(int argc, char *argv[]) { int rc = 0; char dbAlias[SQL_ALIAS_SZ + 1]; char user[USERID_SZ + 1]; char pswd[PSWD_SZ + 1]; /* check the command line arguments */ rc = CmdLineArgsCheck1(argc, argv, dbAlias, user, pswd); if (rc != 0) { return rc; } printf("\nTHIS SAMPLE SHOWS HOW TO USE NULL AND DEFAULT VALUE\n"); printf("COMPRESSION OPTION AT TABLE LEVEL AND COLUMN LEVEL.\n"); /* connect to database */ rc = DbConn(dbAlias, user, pswd); if (rc != 0) { return rc; } rc = TbCreate(); rc = TbCompress(); rc = TbDrop(); /* disconnect from database */ rc = DbDisconn(dbAlias); if (rc != 0) { return rc; } return 0; } /* main */ int TbCreate(void) { int rc = 0; printf("\n-----------------------------------------------------------"); printf("\nCreating table COMP_TAB\n\n"); /* create the table */ printf(" CREATE TABLE COMP_TAB(Col1 INT NOT NULL WITH DEFAULT,\n"); printf(" Col2 CHAR(7),\n"); printf(" Col3 VARCHAR(7) NOT NULL,\n"); printf(" Col4 DOUBLE) \n"); EXEC SQL CREATE TABLE COMP_TAB(col1 INT NOT NULL WITH DEFAULT, col2 CHAR(7), col3 VARCHAR(7) NOT NULL, col4 DOUBLE); EMB_SQL_CHECK("Table -- Create"); EXEC SQL COMMIT; EMB_SQL_CHECK("Transaction -- Commit"); return rc; } /* TbCreate */ int TbCompress(void) { int rc=0; printf("\n-----------------------------------------------------------\n"); printf(" To activate VALUE COMPRESSION at table level and COMPRESS \n"); printf(" SYSTEM DEFAULT at column level \n\n"); printf(" ALTER TABLE COMP_TAB ACTIVATE VALUE COMPRESSION \n\n"); printf(" Rows will be formatted using the new row format on subsequent\n"); printf(" insert,load and update operation, and NULL values will not be\n"); printf(" taking up space if applicable.\n\n"); /* If the table COMP_TAB does not have many NULL values, enabling compression will result in using more disk space than using the old row format */ EXEC SQL ALTER TABLE COMP_TAB ACTIVATE VALUE COMPRESSION; printf("\n To save more disk space on system default value for column\n"); printf(" Col1, enter\n"); printf("\n ALTER TABLE COMP_TAB ALTER Col1 COMPRESS SYSTEM DEFAULT\n"); printf("\n On subsequent insert, load, and update operations,numerical\n"); printf(" 0 value (occupying 4 bytes of storage) for column Col1 will\n"); printf(" not be saved on disk.\n"); EXEC SQL ALTER TABLE COMP_TAB ALTER Col1 COMPRESS SYSTEM DEFAULT; printf("\n\n To switch the table to use the old format, enter\n\n"); printf(" ALTER TABLE COMP_TAB DEACTIVATE VALUE COMPRESSION\n\n"); printf(" Rows inserted, loaded or updated after the ALTER statement\n"); printf(" will have old row format.\n"); EXEC SQL ALTER TABLE COMP_TAB DEACTIVATE VALUE COMPRESSION; return rc; } /* TbCompress */ int TbDrop(void) { int rc = 0; printf("\n-----------------------------------------------------------"); printf("\nDropping table COMP_TAB\n\n"); /* drop the table */ printf(" DROP TABLE COMP_TAB\n"); EXEC SQL DROP TABLE COMP_TAB; EMB_SQL_CHECK("Table -- Drop"); EXEC SQL COMMIT; EMB_SQL_CHECK("Transaction -- Commit"); return rc; } /* Tbdrop */