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ba7e22dbe4
parameter don't use query cache" Thanks to the fix of BUG#26842, statements prepared with SQL PREPARE and having parameters can now use the query cache. mysql-test/include/query_cache_sql_prepare.inc: now, statements prepared with SQL PREPARE use the query cache even when they have parameters. mysql-test/r/query_cache_ps_no_prot.result: updated result: we see caching happened. mysql-test/r/query_cache_ps_ps_prot.result: updated result: we see caching happened sql/sql_prepare.cc: query expansion does not insert user variables' references anymore, it now inserts parameters' values (BUG#26842's fix did this); so we can use the query cache.
279 lines
8.9 KiB
HTML
279 lines
8.9 KiB
HTML
############### include/query_cache_sql_prepare.inc ################
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#
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# This is to see how statements prepared via the PREPARE SQL command
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# go into the query cache: if using parameters they cannot; if not
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# using parameters they can.
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# Query cache is abbreviated as "QC"
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#
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# Last update:
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# 2007-05-03 ML - Move t/query_cache_sql_prepare.test
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# to include/query_cache_sql_prepare.inc
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# - Create two toplevel tests sourcing this routine
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# - Add tests checking that
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# - another connection gets the same amount of QC hits
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# - statements running via ps-protocol do not hit QC results
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# of preceding sql EXECUTEs
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#
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--source include/have_query_cache.inc
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# embedded can't make more than one connection, which this test needs
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-- source include/not_embedded.inc
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--echo ---- establish connection con1 (root) ----
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connect (con1,localhost,root,,test,$MASTER_MYPORT,);
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--echo ---- switch to connection default ----
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connection default;
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set @initial_query_cache_size = @@global.query_cache_size;
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set @@global.query_cache_size=100000;
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flush status;
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--disable_warnings
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drop table if exists t1;
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--enable_warnings
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create table t1(c1 int);
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insert into t1 values(1),(10),(100);
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# First, prepared statements with no parameters
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prepare stmt1 from "select * from t1 where c1=10";
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show status like 'Qcache_hits';
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execute stmt1;
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show status like 'Qcache_hits';
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execute stmt1;
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show status like 'Qcache_hits';
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execute stmt1;
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show status like 'Qcache_hits';
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# Another prepared statement (same text, same connection), should hit the QC
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prepare stmt2 from "select * from t1 where c1=10";
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execute stmt2;
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show status like 'Qcache_hits';
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execute stmt2;
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show status like 'Qcache_hits';
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execute stmt2;
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show status like 'Qcache_hits';
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# Another prepared statement (same text, other connection), should hit the QC
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--echo ---- switch to connection con1 ----
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connection con1;
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prepare stmt3 from "select * from t1 where c1=10";
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execute stmt3;
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show status like 'Qcache_hits';
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execute stmt3;
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show status like 'Qcache_hits';
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execute stmt3;
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show status like 'Qcache_hits';
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--echo ---- switch to connection default ----
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connection default;
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# Mixup tests, where statements without PREPARE.../EXECUTE.... meet statements
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# with PREPARE.../EXECUTE.... (text protocol). Both statements have the
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# same text. QC hits occur only when both statements use the same protocol.
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# The outcome of the test depends on the mysqltest startup options
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# - with "--ps-protocol"
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# Statements without PREPARE.../EXECUTE.... run as prepared statements
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# with binary protocol. Expect to get no QC hits.
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# - without any "--<whatever>-protocol"
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# Statements without PREPARE.../EXECUTE run as non prepared statements
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# with text protocol. Expect to get QC hits.
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############################################################################
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#
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# Statement with PREPARE.../EXECUTE.... first
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let $my_stmt= SELECT * FROM t1 WHERE c1 = 100;
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eval prepare stmt10 from "$my_stmt";
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show status like 'Qcache_hits';
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execute stmt10;
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show status like 'Qcache_hits';
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execute stmt10;
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show status like 'Qcache_hits';
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eval $my_stmt;
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show status like 'Qcache_hits';
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--echo ---- switch to connection con1 ----
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connection con1;
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eval $my_stmt;
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show status like 'Qcache_hits';
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--echo ---- switch to connection default ----
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connection default;
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#
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# Statement without PREPARE.../EXECUTE.... first
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let $my_stmt= SELECT * FROM t1 WHERE c1 = 1;
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eval prepare stmt11 from "$my_stmt";
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--echo ---- switch to connection con1 ----
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connection con1;
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eval prepare stmt12 from "$my_stmt";
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--echo ---- switch to connection default ----
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connection default;
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eval $my_stmt;
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show status like 'Qcache_hits';
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eval $my_stmt;
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show status like 'Qcache_hits';
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execute stmt11;
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show status like 'Qcache_hits';
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--echo ---- switch to connection con1 ----
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connection con1;
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execute stmt12;
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show status like 'Qcache_hits';
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--echo ---- switch to connection default ----
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connection default;
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# Query caching also works when statement has parameters
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# (BUG#29318 Statements prepared with PREPARE and with one parameter don't use
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# query cache)
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prepare stmt1 from "select * from t1 where c1=?";
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show status like 'Qcache_hits';
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set @a=1;
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execute stmt1 using @a;
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show status like 'Qcache_hits';
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execute stmt1 using @a;
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show status like 'Qcache_hits';
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--echo ---- switch to connection con1 ----
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connection con1;
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set @a=1;
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prepare stmt4 from "select * from t1 where c1=?";
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execute stmt4 using @a;
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show status like 'Qcache_hits';
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# verify that presence of user variables forbids caching
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prepare stmt4 from "select @a from t1 where c1=?";
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execute stmt4 using @a;
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show status like 'Qcache_hits';
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execute stmt4 using @a;
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show status like 'Qcache_hits';
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--echo ---- switch to connection default ----
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connection default;
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# See if enabling/disabling the query cache between PREPARE and
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# EXECUTE is an issue; the expected result is that the query cache
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# will not be used.
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# Indeed, decision to read/write the query cache is taken at PREPARE
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# time, so if the query cache was disabled at PREPARE time then no
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# execution of the statement will read/write the query cache.
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# If the query cache was enabled at PREPARE time, but disabled at
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# EXECUTE time, at EXECUTE time the query cache internal functions do
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# nothing so again the query cache is not read/written. But if the
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# query cache is re-enabled before another execution then that
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# execution will read/write the query cache.
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# QC is enabled at PREPARE
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prepare stmt1 from "select * from t1 where c1=10";
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# then QC is disabled at EXECUTE
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# Expect to see no additional Qcache_hits.
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set global query_cache_size=0;
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show status like 'Qcache_hits';
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execute stmt1;
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show status like 'Qcache_hits';
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execute stmt1;
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show status like 'Qcache_hits';
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execute stmt1;
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show status like 'Qcache_hits';
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# The QC is global = affects also other connections.
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# Expect to see no additional Qcache_hits.
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--echo ---- switch to connection con1 ----
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connection con1;
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execute stmt3;
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show status like 'Qcache_hits';
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execute stmt3;
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show status like 'Qcache_hits';
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execute stmt3;
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show status like 'Qcache_hits';
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#
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# then QC is re-enabled for more EXECUTE.
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--echo ---- switch to connection default ----
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connection default;
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set global query_cache_size=100000;
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# Expect to see additional Qcache_hits.
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# The fact that the QC was temporary disabled should have no affect
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# except that the first execute will not hit results from the
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# beginning of the test (because QC has been emptied meanwhile by
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# setting its size to 0).
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execute stmt1;
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show status like 'Qcache_hits';
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execute stmt1;
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show status like 'Qcache_hits';
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execute stmt1;
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show status like 'Qcache_hits';
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# The QC is global = affects also other connections.
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--echo ---- switch to connection con1 ----
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connection con1;
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execute stmt3;
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show status like 'Qcache_hits';
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execute stmt3;
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show status like 'Qcache_hits';
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execute stmt3;
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show status like 'Qcache_hits';
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--echo ---- switch to connection default ----
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connection default;
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#
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# then QC is re-disabled for more EXECUTE.
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# Expect to see no additional Qcache_hits.
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# The fact that the QC was temporary enabled should have no affect.
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set global query_cache_size=0;
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show status like 'Qcache_hits';
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execute stmt1;
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show status like 'Qcache_hits';
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execute stmt1;
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show status like 'Qcache_hits';
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execute stmt1;
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show status like 'Qcache_hits';
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# The QC is global = affects also other connections.
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--echo ---- switch to connection con1 ----
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connection con1;
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execute stmt3;
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show status like 'Qcache_hits';
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execute stmt3;
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show status like 'Qcache_hits';
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execute stmt3;
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show status like 'Qcache_hits';
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#
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--echo ---- switch to connection default ----
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connection default;
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# QC is disabled at PREPARE
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set global query_cache_size=0;
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prepare stmt1 from "select * from t1 where c1=10";
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--echo ---- switch to connection con1 ----
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connection con1;
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prepare stmt3 from "select * from t1 where c1=10";
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--echo ---- switch to connection default ----
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connection default;
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# then QC is enabled at EXECUTE
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set global query_cache_size=100000;
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show status like 'Qcache_hits';
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execute stmt1;
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show status like 'Qcache_hits';
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execute stmt1;
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show status like 'Qcache_hits';
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execute stmt1;
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show status like 'Qcache_hits';
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# The QC is global = affects also other connections.
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--echo ---- switch to connection con1 ----
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connection con1;
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show status like 'Qcache_hits';
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execute stmt3;
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show status like 'Qcache_hits';
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execute stmt3;
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show status like 'Qcache_hits';
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execute stmt3;
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show status like 'Qcache_hits';
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--echo ---- switch to connection default ----
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connection default;
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#
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# QC is disabled at PREPARE
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set global query_cache_size=0;
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prepare stmt1 from "select * from t1 where c1=?";
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# then QC is enabled at EXECUTE
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set global query_cache_size=100000;
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show status like 'Qcache_hits';
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set @a=1;
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execute stmt1 using @a;
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show status like 'Qcache_hits';
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set @a=100;
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execute stmt1 using @a;
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show status like 'Qcache_hits';
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set @a=10;
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execute stmt1 using @a;
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show status like 'Qcache_hits';
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drop table t1;
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--echo ---- disconnect connection con1 ----
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disconnect con1;
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set @@global.query_cache_size=@initial_query_cache_size;
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flush status; # reset Qcache status variables for next tests
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