ppf: Add MySQL sample queries.

Useful for determining the proper indexes that should be added.

diff --git a/ppf/db-mysql/sample-queries.sql b/ppf/db-mysql/sample-queries.sql
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index 0000000..8486aeb
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+--
+-- Sample SQL queries to acknowledge the better positioning of indexes.
+-- Queries are tested against the p2p_logs database.
+--
+-- 2011, Razvan Deaconescu, razvan.deaconescu@cs.pub.ro
+--
+
+-- select client sessions in a swarm
+select count(*) from client_sessions where swarm_id=1;
+
+-- select status messages for a given client session
+select count(*) from status_messages where cs_id=1;
+
+-- select status messages in a given time range
+select count(*) from status_messages where cs_id=1;
+timestamp<'2009-07-01 00:00:00' and timestamp>'2009-06-10 00:00:00';
+
+-- select status messages for a given swarm
+select count(*) from status_messages S, client_sessions C where S.cs_id=C.id and C.swarm_id=1;
+
+-- select status messages whose download speed is above a
+-- certain threshold
+select count(*) from status_messages where download_speed>100 and download_speed<1000;
+
+-- select status messages whose upload speed is above a
+-- certain threshold
+select count(*) from status_messages where upload_speed>100 and upload_speed<1000;
+
+-- select peer status messages in a given client session
+select count(*) from peer_status_messages where cs_id=1;
+
+-- select peer status messages in a given time range
+select count(*) from peer_status_messages where timestamp<'2009-07-01 00:00:00' and timestamp>'2009-06-10 00:00:00';
+
+-- select peer status messages for a given peer
+select count(*) from peer_status_messages where peer_ip='89.245.110.136' and peer_port=49887;
+
+-- select peer status messages for a given swarm
+select count(*) from peer_status_messages P, client_sessions C where P.cs_id=C.id and C.swarm_id=1;
+
+-- select peer status messages whose download speed is above a certain threshold
+select count(*) from peer_status_messages where download_speed>100 and download_speed<1000;
+
+-- select peer status messages whose upload speed is above a certain threshold
+select count(*) from peer_status_messages where upload_speed>100 and upload_speed<1000;
+
+-- select verbose messages for a given client session
+select count(*) from verbose_messages where cs_id=1;
+
+-- select verbose messages of a given type
+select count(*) from verbose_messages where message_type=2;
+
+-- select verbose messages in a given direction
+select count(*) from verbose_messages where direction=1;
+
+-- select verbose messages in a given time range
+select count(*) from verbose_messages where timestamp<'2009-07-01 00:00:00' and timestamp>'2009-06-10 00:00:00';
+
+-- select verbose messages for a given peer
+select count(*) from verbose_messages where peer_ip='89.245.110.136' and peer_port=49887;
+
+-- select all peers in verbose messages
+-- without an index, query takes around 2.0 seconds (on p2p-next-10)
+select distinct peer_ip,peer_port from verbose_messages;
+
+-- select all peers for a given client session
+select distinct peer_ip,peer_port from verbose_messages where cs_id=1;
+
+-- select all peers for a given swarm
+select distinct peer_ip,peer_port from verbose_messages V, client_sessions C where V.cs_id=C.id and swarm_id=1;
+
+-- select number of verbose messages exchanged with each peer
+-- with no index, query takes around 4.5 seconds (on p2p-next-10)
+select peer_ip,peer_port,count(*) from verbose_messages group by peer_ip,peer_port;
+
+-- select verbose messages in a swarm
+select count(*) from verbose_messages V, client_sessions C where C.id=V.cs_id and C.swarm_id=1;
+
+-- select verbose messages of a given type for a given client session
+select count(*) from verbose_messages where cs_id=1 and message_type=2;
+
+-- select verbose messages of a given direction for a given client session
+select count(*) from verbose_messages where cs_id=1 and direction=1;
+
+-- select verbose messages in a given time range for a given client session
+select count(*) from verbose_messages where cs_id=1 and message_type=2;
+timestamp<'2009-07-01 00:00:00' and timestamp>'2009-06-10 00:00:00';
+
+-- select verbose messages for a given peer in a client session
+select count(*) from verbose_messages where cs_id=1 and peer_ip='89.245.110.136' and peer_port=49887;
+
+-- select verbose messages of a given type in a given direction
+select count(*) from verbose_messages where direction=1 and message_type=2;
+
+-- select verbose messages of a given type in a given time range
+select count(*) from verbose_messages where message_type=2 and timestamp<'2009-07-01 00:00:00' and timestamp>'2009-06-10 00:00:00';
+
+-- select verbose messages of a given direction in a given time range
+select count(*) from verbose_messages where direction=1 and timestamp<'2009-07-01 00:00:00' and timestamp>'2009-06-10 00:00:00';
+
+-- select verbose messages of a given type for a given peer
+select count(*) from verbose_messages where peer_ip='89.245.110.136' and peer_port=49887 and message_type=2;
+
+-- select verbose messages in a given direction for a given peer
+select count(*) from verbose_messages where direction=1 and peer_ip='89.245.110.136' and peer_port=49887;
+
+-- select verbose messages of a given type in a swarm
+select count(*) from verbose_messages V, client_session C where C.id=V.cs_id and message_type=2 and swarm_id=1;
+
+-- select verbose messages of a given swarm in a given direction
+select count(*) from verbose_messages V, client_session C where C.id=V.cs_id and direction=1 and swarm_id=1;
+
+-- select verbose messages of a given type in a given direction for a given
+-- client session
+select count(*) from verbose_messages where cs_id=1 and direction=1 and message_type=2;
+
+-- select verbose messages of a given type in a given direction for a given
+-- swarm
+select count(*) from verbose_messages V, client_session C where C.id=V.cs_id and direction=1 and message_type=2 and swarm_id=1;
+
+-- select verbose messages of a given type for a given peer in a client session
+select count(*) from verbose_messages where cs_id=1 and peer_ip='89.245.110.136' and peer_port=49887 and message_type=2;
+
+-- select verbose messages of a given type in a given direction for a given peer
+select count(*) from verbose_messages where cs_id=1 and direction=1 and peer_ip='89.245.110.136' and peer_port=49887;